39 products

6296 - DBXL/MTXL Engine Mount For TR/OBR Billet Crankcase
Regular price $15.00This mount is needed to install an engine into a DBXL or MTXL with our billet crankcase.

6283 - CNC Ported Full Mod 29.5cc TR/OBR 4 Bolt Reed Case Engine
Regular price $525.00
6282 - CNC Ported Full Mod 29.5cc TR/OBR 4 Bolt Reed Case Long Block
Regular price $425.00
1722 - 5hp CNC Ported PROSTOCK 29.5cc 4 Bolt Long Block - Billet Crankcase
Regular price $239.00
1720 - CNC Ported Full Mod Zenoah 29.5cc 4 Bolt Long Block - Billet Crankcase
Regular price $275.00
1719 - CNC Ported Full Mod Zenoah 29.5cc 4 Bolt Engine - Billet Crankcase
Regular price $349.00This 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 29.5cc is a great all around performing engine and can be used for most applications. The big bore 36mm top end with a 1mm stuffed crank is a great balance of torque and rpms.
This isn't your run of the mill quick and dirty garage port job. The staff at OBR has over 20 years combined experience tuning engines. We know how to get the job done right the first time with out breaking the bank.
To start we machine the combustion chamber for a proper squish clearance and compression ratio. We learned a long time ago that stacking and/or using thicker cylinder gaskets does not make power. From there the cylinder and piston are aggresively modified but not to the point where reliability and ease of use is lost. Reliability and ease of use is always our first objective when we tune an engine. Every port in the cylinder has been professionaly modified and the piston has been lightened and relieved.
This engine fits:
* Tech Note: Installation in an HPI Baja requires that the stock Zenoah clutch be modified for a direct bolt up. Or the clutch from your stock fuelie 23/26 can be installed on this engine for a direct bolt up. The last option is a TR/OBR sealed clutch housing. The sealed clutch housing can be used with a machined CY clutch plate for a direct bolt up.
Off-road Rc Cars: HPI Baja 5B/5T/5SC, MCD, Rampage, FG Marder, FG Marder Race, FG Monster Beetle, FG Monster Beetle Pro,FG MT5,FG Stadium Truck, Duratrax Firehammer, Carson Attack, Smartech Traveller,FG Leopard, XTM, Leopard Race, FG Leopard STX, FG Marder Beetle, FG Pajero and most other large scale cars.
On-road Rc Cars: MCD, FG Evo,FG Sportline, HARM,FG F-1 Competition and most other large scale onroad cars.

6222 - Full Mod EFRA Legal G270RC 25.4cc Engine - Billet Case
Regular price $499.00
6220 - Full Mod CNC Track Ported Zenoah 22.5cc Yuji Edition On-Road Engine
Regular price $499.00
Full Mod CNC Ported Zenoah 4 Bolt 22.5cc G240RC Engine - Billet Crankcase
Regular price $529.00
6206 - CNC Ported Full Mod Zenoah 27.2cc 4 Bolt Engine - Billet Crankcase
Regular price $400.00This 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.
Full Mod - Our top of the line engines.
Check out our YouTube channel to see our engines in action: http://www.youtube.com/user/oneillbrothersracing
Customers Rides: http://www.youtube.com/watch?v=47s-3MNiZXE&feature=email
The full mod 27.2cc 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 2mm stuffed 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:
* Tech Note: Installation in an HPI Baja requires that the stock Zenoah clutch be modified for a direct bolt up. Or the clutch from your stock fuelie 23/26 can be installed on this engine for a direct bolt up. The last option is a TR/OBR sealed clutch housing. The sealed clutch housing can be used with a machined CY clutch plate for a direct bolt up.
Off-road Rc Cars: HPI Baja 5B/5T/5SC, MCD, Rampage, FG Marder, FG Marder Race, FG Monster Beetle, FG Monster Beetle Pro,FG MT5,FG Stadium Truck, Duratrax Firehammer, Carson Attack, Smartech Traveller,FG Leopard, XTM, Leopard Race, FG Leopard STX, FG Marder Beetle, FG Pajero and most other large scale cars.
On-road Rc Cars: MCD, FG Evo,FG Sportline, HARM,FG F-1 Competition and most other large scale onroad cars.

6265 - Full Mod 28.5cc G290RC 4 Bolt Long Block
Regular price $299.00
6264 - Full Mod Zenoah 27.2cc 4 Bolt Long Block
Regular price $299.00
6261 - 5.5hp CNC Ported PROSTOCK 30.5cc 4 Bolt Long Block - Billet Case
Regular price $239.00
6257 - CNC Ported 5.2hp Prostock 28.5cc G290RC 4 Bolt Long Block - Billet TR/OBR Crankcase
Regular price $219.001808 - OBR Power Stack / Velocity Stack (Aluminum & Delrin)
Regular price $49.99Billet delrin version is now available and is half the weight of the aluminum version. OBR power stack is compatible with most aftermarket clamp on air filters. This is a bolt on performance item that will improve power on any engine that's stock or fully modified. We spent several months developing this stack on our in-house flow bench and dyno. We've seen more power out of this design than any other stack that we have tested. Dyno graph can be found in the images. Tapered bore increases velocity through the intake tract and gives better consistency. The clamping surface has barbs to prevent the air filters from falling off under hard running. There is no boss on this stack which allows the air filter to be pushed closer to the carb for cars that have minimal air filter clearance.