QUOTE(larss @ Sep 29 2011, 07:17 AM)
/Lars
QUOTE
You have to determine what compression ratio you want then you need to measure your deck height.
Thanks guys,
I will go for standard performance and aim for getting close to the standard compression ratio (within some margin). I dont know how thick the head gasket is and if removing it will be a noticeable increase? Someone may have done this calculation before for an all standard 1,7 80Hp engine ...
QUOTE
"Every expert suggests"? What, I'm no expert, despite my 38 years of T4 engine building? I use them and I've never had a problem. If you choose not to use them, plan on calculating the CR and shimming accordingly (we do that with the gaskets, because you need to do it)> You'll need a way to accurately measure the combustion chamber volume and a way to measure the piston deck height.
The Cap'n
Sorry Cap'n, I fully respect your opinion, havent noticed any different opinions on this until now (haven't read the treads carefully enough Im afraid).
It has been written several times that VW/Porsche issued a service message about this but can not find the original posted anywhere...
Anyhow, someone may already have done the combustion chamber measurements and calculation for a all standard 1,7 80Hp setup?
/Lars S
o
You obviously don't know, because you couldn't find the technical bulletin, that the delete applies ONLY to the 2 liter busses with the modified replacement cylinder heads. It doesn't apply to the original heads, nor to the 1.7/1.8 engines, nor to the 2.0 Porsche engine. The internet is filled with people who mention the document but have failed to either read or understand it. Lotsa cases like that, and not just in the car related sites. People hear things and repeat them as if they were true. Jake, among others, leaves the gaskets out, and I'm fine with that. He has the R&D and practical experience to do that, and he has the ability to prepare ALL the necessary surfaces in order to do it right, and not to just leave them out. FWIW, if your heads are not new and untouched, the CC volume isn't going to be "standard". Surfacing the head changes the CC volume, and the amount of change depends on the depth and the number of times it's been done.
The Cap'n