6209 - CNC Ported Full Mod Zenoah 30.5cc 4 Bolt Long Block - Billet Crankcase

This long block 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 this engine in action: http://www.youtube.com/watch?v=NhQ50CvSVIM 

The full mod 30.5cc has proven to be one of the most popular engines we build. This is a great way to upgrade to a full mod 4 bolt engine and save some cash. To complete this long block you will need a flywheel, coil, covers, carb and clutch. All of thse items can be removed from your stock engine. Our long blocks come with a complete 4 bolt Zenoah crankcase with bearings, seals, 2mm stroker crank and full mod top end. All long blocks come assembled as shown in the picture.  

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.

The following porting and machined has been performed to this long block:

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. Re-bevel all porting and stock bevels to prevent damage to the piston and/or cylinder

 
This long block fits:

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.