1718 - 7.5hp Full Mod Zenoah 27.2cc +3mm LONG ROD 4 Bolt Long Block

Full Mod - Our top of the line engines. OBR is proud to offer the first production long rod engine! At OBR we take pride in innovating and not duplicating!

View images above for more info on long rod cranks and dyno sheets.

Just when we thought there wasn't any way to top our insane full mods Syndicate came along and gave us the power to do so. The long rod crankshaft along with some new porting allowed us to achieve 7.5hp.  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
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 Syndicate 2mm stroker crankshaft with +3mm connecting rod 
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.