Ryan wrote: > What is the piston to head deck height for an 1835 ?
"Deck height" on VW's is usually considered to be the distance from the top of the piston to the top of the cylinder, not to the head (although I guess they are actually the same thing, since the head is pulled up against the cylinder). Since the head is the combustion chamber, and you can't measure it anyway, the deck height is the distance that the piston sits down in the cylinder (or sticks out). Basically, it's whatever you set it to be by using shims between the cylinders and the the engine case. It's not just a number that is set in stone, but a number that you determine you want it to be based on what compression ratio you want the engine to have. Then you put the shim that gets you closest to that number under the cylinder to set it. I did a web page on how to check it at http://home.hiwaay.net/~langford/corvair/trial_assy.html , but you'll also need to know the combustion chamber volume to calculate compression ratio, and that was shown at http://home.hiwaay.net/~langford/corvair/valvejob.html . If you take a stock engine and bore it out to 1835, your compression ratio will almost certainly be higher than it should be for aircraft use, but I guess that's a matter of opinion. I feel strongly that everybody should cc their chambers and KNOW for a fact what their compression ratio is on all four cylinders. Otherwise you're just guessing what's going on in your engine... Mark Langford, Huntsville, AL N56ML "at" hiwaay.net see KR2S project at http://home.hiwaay.net/~langford
