Productos

This engine now comes with a TR/OBR billet crankcase at no extra cost.Every long block or engine is now CNC ported and hand finished. CNC porting and hand finishing is all done in-house by the OBR staff. We do not contract out any of our porting so every engine is modified to our exact specifications. We are able to offer higher accuracy this way as well as more power. Our CNC machine has allowed us to take our porting to the next level due to us being able to do cylinder work that is not possible to do by hand.

The full mod 30.5cc has proven to be one of the most popular engines we build. With the higher reliability of the 4 bolt Zenoah engines we were able to achieve more power with out sacrificing reliability. We put all of the knowledge that we have picked up from years of dyno and field testing and came up with a monster. To start we completely tear down the engines and perform the following modifications:

1. Machine combustion chamber for a proper squish clearance without stacking cylinder gaskets
2. Reshape piston
3. Lighten piston
4. Relieve piston to prevent seizes 
5. Modify intake port for better flow
6. Adjust intake duration to our specs
7. Resurface all ports
8. Modify transfer ports for better flow
9. Enlarge and reshape exhaust port
10. Adjust exhaust duration to our specs
11. Remove stock crank and install cy 2mm stroker crank
12. Install all new gaskets and c-clips when engine is assembled
13. Re-bevel all porting and stock bevels to prevent damage to the piston and/or cylinder

 
This engine fits: Losi 5ive-T 

This mount is needed to install an engine into a DBXL or MTXL with our billet crankcase.

We're proud to announce the release of our full mod G320RC 31.8cc engine. We're very happy with the changes that Zenoah has made and it's turning out to be a great engine. Engine is fully modified just like our normal full mods. Being the transfer ports are enclosed we can't modify them quite the same but they are modified. Intake and exhaust ports are modified to our specs as well as the durations. Just like a 30.5cc we cut the combustion chamber and reshape for more power. Engine is complete with the option to add/remove carb and clutch. Just bolt on your exhaust and filter and it's ready to run. 

G320RC has the following improvements over the G290RC
Larger crankcase bearings
Larger lower connecting rod bearing
Larger needle bearing
Enclosed transfer ports with removal plate
New carb

Parts that are different and not compatible with our current engines are:
Cylinder
Piston
Ring
Piston Pin, Bearing, Washers
Crankcase
Crankshaft
Crankcase Bearings
Outer Clutch Case
Engine Cover (shroud)
Crankcase Gasket
Insulator Gasket
Cylinder Gasket
Piston Pin, C-Clips, Washers, Bearing, etc
Insulator Manifold
Carburetor
Large Oil Seal

All G320/340 reed engines now come with a V2 reed case as well as reed valve. The V2 case has been redesigned to produce more power and eliminate the need for a mesh mod without effecting cooling or air flow.  

We're proud to announce the release of our full mod G320RC reed case engine. You have the option to order with or without carb and clutch. Big thanks to Dave@Turtle Racing for all of your help making these cases. Designed similar to our current reed cases with a replaceable fan cover. We've stuffed the case and taken out as much case volume as possible to help with performance. We've also changed the geometry in the transfer bowls to flow more fuel. We've used a similar intake tract that has been proven on our dyno and flow bench to produce more power. This engine is rated at 9.1hp with a max rpm of over 20,000 on our dyno. Gearing, car/truck weight, exhaust etc will be a factor in rpm's. This engine is fully modified just like our 29.5cc and 30.5cc reed engines. We modify the transfer ports, piston, intake port, exhaust port, cut and reshape combustion chamber and change duration's to our specs as well as cut a boost port and window the piston to match. This engine comes complete with clutch(Air filter and exhaust not included). You have the option to order this engine with or without a carb.  This engine has the same size exhaust port as the current 22.5cc - 30.5cc engines so a new  pipe is not needed. 

Fits: HPI Baja 5B 5T 5SC 5R, Kraken Vekta , Losi 5ive-T, Recat Dune Runner/MT

All G320RC/G340RC reeds are now V2 cases with V2 reed valves. The V2 case has been redesigned to produce more power and eliminate the need for a mesh mod without effecting cooling or air flow. V2 reed valves come with a Delrin isolator to prevent heat transfer from the case to the carb. 

Complete reed case for the G320RC/G340RC engine only!! This case can be bolted up to a stock G320RC but at the minimum the intake port and pulse hole need to be epoxied. To get the full potential out of the case reed porting is required. This case comes complete with hardware, bearings, seals, snap ring, reed block gasket and reed petals/tensioner plates. This case does not use a gasket to seal the two halves and a good gasket sealer such as threebond 1211 is required.

<p>This crankcase only fits the Zenoah G320RC/G340RC engine! We've clearanced the inside of the crankcase for a +2mm stroke. You can expect a small gain in performance by just installing this crankcase. We've removed the excess volume from the crankcase to help with throttle response. Transfer bowls have been changed to help with flow and oil holes have been added to prolong crankcase bearing life. Cases come complete with nachi crankcase bearings, snap ring and oil seals installed. Just like our other cases we went with a 3 piece design. If you're ever to crack the fan cover mount it can be replaced by itself instead of having to purchase a complete crankcase. There is not a gasket that seals the two case halves. A good gasket sealant such as threebond 1211 needs to be used.</p>

Compared to the full mod G320RC engine you can expect more HP, torque and mid range power from the stroker crankshaft and top rpms are very close. Short video of the G340RC in a Losi 5ive-T. 

We're proud to announce the release of our full mod G340RC 34cc engine. We're very happy with the changes that Zenoah has made and it's turning out to be a great engine. Engine is fully modified just like our normal full mods. Being the transfer ports are enclosed we can't modify them quite the same but they are modified. Intake and exhaust ports are modified to our specs as well as the durations. Just like a 30.5cc we cut the combustion chamber and reshape for more power and to prevent stacking cylinder gaskets. You have the option to order this engine with or without a carb.

G320RC has the following improvements over the G290RC
Larger crankcase bearings
Larger lower connecting rod bearing
Larger needle bearing
Enclosed transfer ports with removal plate
New carb

Parts that are different and not compatible with our current engines are:
Cylinder
Piston
Ring
Piston Pin, Bearing, Washers
Crankcase
Crankshaft
Crankcase Bearings
Outer Clutch Case
Engine Cover (shroud)
Crankcase Gasket
Insulator Gasket
Cylinder Gasket
Piston Pin, C-Clips, Washers, Bearing, etc
Insulator Manifold
Carburetor
Large Oil Seal

Fits: HPI Baja 5B 5T 5SC 5R, Kraken Vekta , Losi 5ive-T, Recat Dune Runner/MT

All G320/340 reed engines now come with a V2 reed case as well as reed valve. The V2 case has been redesigned to produce more power and eliminate the need for a mesh mod without effecting cooling or air flow. 

 

This engine is modified (porting machining) exactly the same as our reed G320RC with the addition of a 2mm stroker to get the displacement up to 34cc. The HP difference isn't huge because this engine produces more torque and at a lower rpm. You can expect quite a bit more torque over the G320 and top ends are very close. The crankcase has been machined to accept the 2mm stroker without rubbing or binding.

We're proud to announce the release of our full mod G340RC reed case engine. You have the option to order with or without carb. Big thanks to Dave@Turtle Racing for all of your help making these cases. Designed similar to our current reed cases with a replaceable fan cover. We've stuffed the case and taken out as much case volume as possible to help with performance. We've also changed the geometry in the transfer bowls to flow more fuel. We've used a similar intake tract that has been proven on our dyno and flow bench to produce more power. This engine is rated at 9.4hp with a max rpm of about 20,000 on our dyno. Gearing, car/truck weight, exhaust etc will be a factor in rpm's. This engine is fully modified just like our 29.5cc and 30.5cc reed engines. We modify the transfer ports, piston, intake port, exhaust port, cut and reshape combustion chamber and change duration's to our specs as well as cut a boost port and window the piston to match. A complete clutch is included with the engine and you have the choice to order with or without a carb.. This engine has the same size exhaust port as the current 22.5cc - 30.5cc engines so a new  pipe is not needed. 

 

Fits: HPI Baja 5B 5T 5SC 5R, Kraken Vekta , Losi 5ive-T, Recat Dune Runner/MT

Porting not shown in picture!

Full mod G320RC top end. Can be installed onto a stock G320RC engine or is a replacement top end for full mod engine 6300. View engine description for modifications done to top end. https://oneillbrothers.com/products/6300-7-7hp-full-mod-zenoah-g320rc-31-8cc-engine?_pos=1&_sid=6be5a34a3&_ss=r

Top end comes complete with:

Ported cylinder

Modified piston

piston ring

Cylinder gasket

Transfer port/skavenging covers

Wrist pin

Thrust/piston pin washer

c-clip set 

Replacement fully modified G320RC reed top end  for engine 6304 and long block 6323. This top end must be used on a stock stroke G320RC crankshaft.

Porting not shown in picture!

Full mod G340RC top end. Can be installed onto a stock G320RC(with +2mm stroke crank) engine or is a replacement top end for full mod engine 6309. 

Top end comes complete with:

Ported cylinder

Modified piston

piston ring

Cylinder gasket

Transfer port/skavenging covers

Wrist pin

Thrust/piston pin washer

c-clip set 

Replacement fully modified G340RC top end  for engine 6310. A +2mm stroke crank is required for this top end.

An aftermarket filter is recommended for install in a DBXL!

Every long block or engine is now CNC ported and hand finished. CNC porting and hand finishing is all done in-house by the OBR staff. We do not contract out any of our porting so every engine is modified to our exact specifications. We are able to offer higher accuracy this way as well as more power. Our CNC machine has allowed us to take our porting to the next level due to us being able to do cylinder work that is not possible to do by hand.

Due to high demand, there is a lead time on all of our reed engines. Please contact us prior to ordering if this is an issue.

This engine will come with a CY fancover for a direct fitment into an HPI Baja, Losi and most other large scale rc cars. Available with out clutch or with the correct clutch for a direct fitment into your large scale car. 

We are extremely proud to release the TR/OBR 4 bolt reed case. To start, we would like to thank Dave at Turtle Racing and Yamadude for all of their hard work that it took to make this happen! Dave has spent countless hours and late nights designing the many prototypes that we went through making these cases to perfection.

Short teaser video http://www.youtube.com/watch?v=ZqOtYAqOCDs l  More video will be available soon. 

This is not a knock off or slight redesign of any current reed engine. Though there are only so many things that could be changed while still being able to fit into our 1/5^th scale cars, there is a lot more that has gone into these cases than most will realize. Yamadude stepped in to assist and was a huge help with design and flow bench testing. Many prototypes had to be made to achieve the ideal intake track for the best possible flow.

 

Between the help of Dave and Yamadude, that gave us the tools we needed to give you all more power! For those of you not familiar with our history we are coming up on our 10^th year in business. We take a lot of pride in every engine that ships out of the OBR warehouse and we feel this one really reflects what we are capable of building. The development of this case took several months, a lot of labor, testing on our dyno, in-car testing and we could not be more pleased with the final product. We have seen horsepower and torque numbers we never thought possible out of engines this size. We are seeing quite a bit more torque and rpm’s as good, if not better than, our piston port long rod engines. 

Tech note: Both the CY & TR/OBR  clutch can be used for an HPI Baja, Losi, Rampage etc. Choose a Zenoah clutch for an MCD or FG. 

An aftermarket filter is recommended for install in a DBXL!

Every long block or engine is now CNC ported and hand finished. CNC porting and hand finishing is all done in-house by the OBR staff. We do not contract out any of our porting so every engine is modified to our exact specifications. We are able to offer higher accuracy this way as well as more power. Our CNC machine has allowed us to take our porting to the next level due to us being able to do cylinder work that is not possible to do by hand.

Due to high demand, there is a lead time on all of our reed engines. Please contact us prior to ordering if this is an issue.

We are now offering two versions of our reed engine. The original is the long rod which is now our high rev version. The new high torque version comes with a non-long rod crank. The high torque version is optimal for 4WD's, heavy cars etc. 

We are extremely proud to release the TR/OBR 4 bolt reed case. To start, we would like to thank Dave at Turtle Racing and Yamadude for all of their hard work that it took to make this happen! Dave has spent countless hours and late nights designing the many prototypes that we went through making these cases to perfection.

Short teaser video http://www.youtube.com/watch?v=ZqOtYAqOCDs l  More video will be available soon. 

This is not a knock off or slight redesign of any current reed engine. Though there are only so many things that could be changed while still being able to fit into our 1/5^th scale cars, there is a lot more that has gone into these cases than most will realize. Yamadude stepped in to assist and was a huge help with design and flow bench testing. Many prototypes had to be made to achieve the ideal intake track for the best possible flow.

 

Between the help of Dave and Yamadude, that gave us the tools we needed to give you all more power! For those of you not familiar with our history we are coming up on our 10^th year in business. We take a lot of pride in every engine that ships out of the OBR warehouse and we feel this one really reflects what we are capable of building. The development of this case took several months, a lot of labor, testing on our dyno, in-car testing and we could not be more pleased with the final product. We have seen horsepower and torque numbers we never thought possible out of engines this size. We are seeing quite a bit more torque and rpm’s as good, if not better than, our piston port long rod engines. 

 

These cases are designed to be used exclusively with a +3mm long rod crankshaft and may not be used with a non long rod crankshaft. In able to offer you a better product, we’ve chosen to not use a crankcase gasket. This allows for tighter tolerances and higher reliability when a good sealant such as Yamabond is used. The deck height has been raised 3mm to prevent the need of a cylinder spacer. One standard gasket is all that is necessary.

 

As an option, you may choose to add a TR/OBR sealed clutch housing. When choosing this option, we will install three open crankcase bearings into your reed case. This option also allows for a direct fitment into any HPI Baja or Losi 5-ive T.

 

One of our favorite features is the three piece case design. Over our many years with large scale rc cars, we’ve seen our fair share of cracked crankcases. The TR/OBR reed case has a replaceable fan cover mount incase you ever crack or break it. This is a much cheaper alternative to replacing the whole or half case.

 

To top everything off, we’ve chosen Boyesen reed petals. We’ve also kept in mind that there’s more than just HPI’s out there. This reed case will fit any HPI Baja, Losi 5-ive T, MCD’s, FG’s and most other large scale rc cars.

We at OBR feel the 30.5cc reed case is one of the best-balanced engines we have ever engineered. We’ve seen a lot more torque than we’ve seen out of an engine this size while still reving over 20,000 rpms. We expect to have more options in the future, but this one is going to be hard to top. Fully ported with all of the bells and whistles your used to from our fully modified engines. 

Tech note: Just about any CY/Zenoah, 2 or 4 bolt engine can be used to complete this long block. If you are not sure feel free to contact any of our staff for assistance. 

Replacement fully ported top end for 30.5cc reed engines sku 6316.

Replacement fully modified top end for engine 6274. This top end can also be used to upgrade a stock G290RC. A +2mm stroke crank is required.

This long block can be order with a OEM Zenoah crankcase or our billet crankcase in the drop downs. G320RC vs G340RC the G320 revs higher due to the smaller stroke crank and the G340 being a stroked engine has more torque.

We're proud to announce the release of our full mod G320RC 31.8cc long block. We're very happy with the changes that Zenoah has made and it's turning out to be a great engine. Engine is fully modified just like our normal full mods. Being the transfer ports are enclosed we can't modify them quite the same but they are modified. Intake and exhaust ports are modified to our specs as well as the durations. Just like a 30.5cc we cut the combustion chamber and reshape for more power.  

G320RC has the following improvements over the G290RC
Larger crankcase bearings
Larger lower connecting rod bearing
Larger needle bearing
Enclosed transfer ports with removal plate
New carb

Parts that are different and not compatible with our current engines are:
Cylinder
Piston
Ring
Piston Pin, Bearing, Washers
Crankcase
Crankshaft
Crankcase Bearings
Outer Clutch Case
Engine Cover (shroud)
Crankcase Gasket
Insulator Gasket
Cylinder Gasket
Piston Pin, C-Clips, Washers, Bearing, etc
Insulator Manifold
Carburetor
Large Oil Seal

This long block can be order with a OEM Zenoah crankcase or our billet crankcase in the drop downs. G320RC vs G340RC the G320 revs higher due to the smaller stroke crank and the G340 being a stroked engine has more torque.

We're proud to announce the release of our full mod G340RC 34cc long block. We're very happy with the changes that Zenoah has made and it's turning out to be a great engine. Engine is fully modified just like our normal full mods. Being the transfer ports are enclosed we can't modify them quite the same but they are modified. Intake and exhaust ports are modified to our specs as well as the durations. Just like a 30.5cc we cut the combustion chamber and reshape for more power.  

G320RC has the following improvements over the G290RC
Larger crankcase bearings
Larger lower connecting rod bearing
Larger needle bearing
Enclosed transfer ports with removal plate
New carb

Parts that are different and not compatible with our current engines are:
Cylinder
Piston
Ring
Piston Pin, Bearing, Washers
Crankcase
Crankshaft
Crankcase Bearings
Outer Clutch Case
Engine Cover (shroud)
Crankcase Gasket
Insulator Gasket
Cylinder Gasket
Piston Pin, C-Clips, Washers, Bearing, etc
Insulator Manifold
Carburetor
Large Oil Seal

All G320/340 reed engines now come with a V2 reed case as well as reed valve. The V2 case has been redesigned to produce more power and eliminate the need for a mesh mod without effecting cooling or air flow.

G320RC vs G340RC the G320 revs higher due to the smaller stroke crank and the G340 being a stroked engine has more torque.

We're proud to announce the release of our full mod G340RC reed case engine. Big thanks to Dave@Turtle Racing for all of your help making these cases. Designed similar to our current reed cases with a replaceable fan cover. We've stuffed the case and taken out as much case volume as possible to help with performance. We've also changed the geometry in the transfer bowls to flow more fuel. We've used a similar intake tract that has been proven on our dyno and flow bench to produce more power. This engine is rated at 9.4hp with a max rpm of over 20,000 on our dyno. Gearing, car/truck weight, exhaust etc will be a factor in rpm's. This engine is fully modified just like our 29.5cc and 30.5cc reed engines. We modify the transfer ports, piston, intake port, exhaust port, cut and reshape combustion chamber and change duration's to our specs as well as cut a boost port and window the piston to match. This engine has the same size exhaust port as the current 22.5cc - 30.5cc engines so a new pipe is not needed. 

G320/340RC has the following improvements over the G290RC
Larger crankcase bearings
Larger lower connecting rod bearing
Larger needle bearing
Enclosed transfer ports with removal plate

Parts that are different and not compatible with our current engines are:
Cylinder
Piston
Ring
Piston Pin, Bearing, Washers
Crankcase
Crankshaft
Crankcase Bearings
Outer Clutch Case
Engine Cover (shroud)
Crankcase Gasket
Insulator Gasket
Cylinder Gasket
Piston Pin, C-Clips, Washers, Bearing, etc
Insulator Manifold
Carburetor
Large Oil Seal

<p>These are not a copy of the stock Zenoah transfer port plates. These are a performance upgrade that add up to 0.5hp. Billet transfer port covers for the G320RC and G340RC engines(not compatible with 22.5cc - 30.5cc engines). The angles and volume of these plates has been changed to increase power. We've seen a power gain on both stock and ported engines. Clutch and flywheel side plates are included with hardware. Sealant is required when installing.</p>

Fits Losi 5ive-T 1.0 and Rovan/30 Defree North trucks that are a clone of the 1.0. If you're unsure reach out to us before ordering and send pictures or a link to the truck you have. 

DOES NOT FIT: 5ive-T 2.0, 5ive-B, DBXL, MTXL, HPI, Redcat or MCD.

This engine is now available with the option to add a +1mm stroke crankshaft to increase the displacement to 47cc. From our testing the added stroke helps with more torque and mid range power.  This engine is only available for the Losi 5ive-T 1.0 and Rovan/clone trucks. The complete kit comes with everything needed to install and run. This is a direct bolt up with no modifications required and fits under the stock cage/body without trimming. The kit includes a fully ported/modified 46cc engine, OBR pipe, Turtle Racing mounting kit, DT1 air filter and a BBRC hardened 26T pinion. The pinion will mesh perfectly with the stock 58T center drive/spur gear and the stock 19T chassis spacers.

Every cylinder is ported and then sent out for treatment that is done here in the states. The treatment helps bond the chrome plating to the cylinder and significantly strengthens it without making the plating brittle. At the same time Molybdenum Disulfide is embedded into the plating to reduce friction. The reduction in friction increases power and the life of the engine. This treatment also significantly increase the cylinders ability to retain oil. To match we also have the piston and ring treated. After the treatment we find these engines to be just as reliable as a Zenoah if not more but with longer life due to the treatment done to the top end. We are so confident in this engine's reliability that we back it with a full warranty. The warranty covers our porting, manufactures defects, plating failures but does not cover user error. Please contact us for more information on our warranty policy. This engine comes standard with a 78mm 3 shoe clutch and has a much longer life than the stock Zenoah/CY 54mm clutches that are commonly used. It also comes with a pullstart similar to the Zenoah marine EZ start with cogs. This makes the engine extremely easy to start and longer lasting than the stock Zenoah/CY pullstart's commonly used on the 23-34cc engines. We've fully ported similar to the specs of our 28.5cc - 34cc engines to enhance the power considerably over stock. We have also decked the cylinder to raise the compression. An over-sized finned flywheel is used to prevent any cooling issues.

This kit is a direct bolt up and no major modifications are required. The stock throttle linkage will need to be modified to work or we provide a new linkage rod with the kit. The Turtle Racing mounting kit is fully CNC'd from 6061 billet aluminum and is absolutely bulletproof. We've added an extra brace from the engine to the center diff to fully lock down the engine so that hard running/jumping is not an issue.

There is a lead time on this engine due to the high amount of labor that goes into porting/building as well as having the cylinder treated. If this is an issue please contact prior to ordering.

It's not shown in the picture but we have to cut out a small section of the crankcase and fan cover to clear the center drive shaft. It does not hurt the integrity of the engine what so ever. The pipe has been changed slightly from what is shown in the picture. We've move the pipe to be able to get to the carb needles easier. We have also switched from the o-ring style exhaust header to a coupler header to prevents leaks.

Replacement Top End for 6023 - Signature Series Dirt Oval Mod Zenoah 4 Bolt 30.5cc engine.

This V2 reed valve is an upgrade for any of our reed engines(28.5cc - 34cc) We've added an isolator to keep the carb from heating as well as opened up the volume in the reed to flow more fuel/air improving power. You will see an instant performance gain by simply removing your V1 reed and installing the V2. Two gaskets are included for both sides of the isolator as well as two sets of carb bolts to cover most air filter setups. Reed petals are not included.

All G320/340 reed engines now come with a V2 reed case as well as reed valve. The V2 case has been redesigned to produce more power and eliminate the need for a mesh mod without effecting cooling or air flow.

The OBR signature series line is our newest line of engines which is the absolute best that we have to offer. You can expect power to match any of big tuners out there if not more. Compared to a full mod you can expect quite a bit more overall power as well as torque. We do all of the same porting as our full mods as well as additional piston modifications, crankcase modifications, and cylinder modifications. We've modified absolutely everything possible to increase power without sacrificing reliability.

Our signatures series has become our premiere race engine and can be special ordered and tuned for any type of racing. In the short time since it's release the signature series line has become a dominate force on the race track. With some of the top pro's in the sport now running signature series engine they've picked up wins as well as TQ in the largest race of the year the West Coast Nationals as well as several other events.