kiwi_craig,how much head work did he have done?what kind of clutch did he go with?

 

Bubba297 - Its called Volumetric Efficiency. You are 100% correct with your theory. The engine will continue to make more torque up to a point but its limited due to the fact that a good venturi cannot be created through the head because the intake ports are too small and cannot get enough air into the combustion chamber. Even if for some reason It did it would still be held up in the exhaust ports. When the venturi through the head is the at its strongest, thats when the engine makes its maximum horsepower.

 

I would say go with a Craycraft port job and a larger cam, like Hotcams Stage 2 or similar. That thing will naturally make so much torque down low that a huge cam will not hurt it too much, just open up the top end.

The Carillo titanium rod is stronger, lighter and will last longer than the stock rod. The Carillo forged rod is stronger and will last longer than the stock rod, but it weighs more. You already have a heavy rotating assembly, so the lighter, stronger rod will be best if you can afford it. About $800. Make sure you have the rotating assembly ballanced at a really good machine shop. Preferably one that builds alot of high HP car engines or a specialty quad shop. That will let you rev a bit higher and will reduce stress and vibration in the engine.

If you have the long dough, you may want to consider having 5 big valves put in. I know Trinity does this, but I am not sure about the other engine shops.

Good luck, and post the dyno results when you get them!

RR1

 

thanks raptorracer1.... i am haveing a hard time finding a place/shop that sells a tie.rod. Powroll does ballance the crank and piston with the kit so i need to find where to get the rod so they can do that to. does anybody know what a stock raptor head flows,craycraft,trinity or any good port shop?

 

The Ti rod is not made by carillo..and they are backordered 6+ weeks, so you might go with a carillo rod instead if you don't want to wait.

 

who makes the rod? how do they run?

 

I have four questions for you.

1) On what brand of dyno did it make those numbers

2) What camshaft is that engine utilizing

3) What is its compression ratio

4) What type of fuel is it using

 

More cc isnt always the answer....keep it simple!