Is there a way to...

[84gmcjimmy]

I was wondering if there is a way to calculate Cubic inches, horse power, torque, compression and whatnot when building an engine? I no that desktop dyno is something like that, is there anything else, or is that it? I want something so when I pick a part I know how much of a gain/loss it will be in the HP/TQ range. Any help is goood /forums/images/graemlins/woot.gif

 

[84gmcjimmy]

Anyone know /forums/images/graemlins/1zhelp.gif

 

[sled_dog]

desktop dyno CAN be a guideline, but the only real variables it lets you plug in are the TYPE of manifold(mind you not exact one which can make a big difference), heads(of course very important), and the camshaft profile. As far as cubic inches, check this here. And to really figure out the true compression you need to have the motor almost completely built, everything else is just an estimate since you need to measure piston height from top of deck to really figure it all out.

 

[84gmcjimmy]

Oooh Okay. So for things like HP/TQ, it's just a guess on how much the whole powerplant will make? Thanks sled_dog /forums/images/graemlins/waytogo.gif

 

[sled_dog]

educated guess but yeah a guess. They have been shown in tests to not be very far off but you really need to build your motor to your purpose not some horsepower dream.

 

[84gmcjimmy]

It's not a horse power dream I have, it's purpose is for deep mud and some rocks. That's why it's not as high as I wanted it.