Increase comp ratio?

[shadetree]

But for things like the cam and whatnot, how do I get there? And how do I obtain the Cc(combustion chamber?) of the engine? From the tech page, I can get bore and stroke, but that seems about it.

The most common way is to mill the cylinder head, taking metal off the block side. This, in effect, reduces combustion chamber size raising the ratio.

If you are seriously considering this, call the tech line at the following site. They can tell you how much milling it takes to raise the compression ratio to the level you want.

www.esslingeracing.com

Unless you can find the volume of the heads printed somewhere, you can measure them yourself. Clamp a piece of plexiglass/thick plastic over the combustion chamber in the head. Drill a hole in the plastic. Using a graduated beaker, or syringe, fill the combustion chamber with mineral oil, and measure how much you put in. There is also a formula somewhere that will get you close. I'll see if I still have it somewhere.shady

 

[rurouni20xx]

i myself am building a custom motor, and picked up a few reference materials along the way, you may not have all the tooling thats listed in the book, but it has the formulas and ways to do all the necessary build up of a race or street/strip motor. the book is called "the step by step guide to engine blueprinting" and is available at cartechbooks.com. granted this is serious stuff and if your really looking into gutting and doing a motor from start to finish this one book has been very handy for my purposes. shadys method of measuring chamber displacement is the easiest way and very effective. there are two ways of raising compression but both must be measured. w/ the engine disassembled put modeling clay on the piston surface covered w/ wd40, then coat the top of it as well. install the head and gasket and torque to spec, then turn the crank over 5-6 times and remove the head/gasket. your clay will have the shape and thickness of the chamber vs piston, you can then see how far down you can go w/o having the piston smacking the valves. you can change pistons or shave the deck or head, just keep in mind you want the proper gap between the valves and pistons to allow for heat expansion and protection in case of valve float. the general rule for minimum piston to valve clearance is .080 inch for the intake valve and .100 inch for the exhaust. you can measure this w/ modeling clay as stated b4, just put it on the valve pockets of the piston and turn it over w/ the head and gasket installed. hope this helps you, and the procedures outlined and measurements are from the book btw.

 

[hippie]

Building an e85 motor would be alright you just need to increase the amount of fuel your giving it. you can run 20 to 30% more fuel with methanol my motor at 12.5 to 1 runs alright on it just have to give it more to drink it also runs alot cooler on meth. right know I'm running Cam2 racing fuel.

 

[Beanmachine7000]

E85 is Ethanol... Not Methanol...

 

[hippie]

Excuse my typing, I meant ethanol