In tat case...I have to be xtra carefull in my revving..
as I have now a no-revcut ecunit..but how can I check compression ratio?
Can any mechanic do it?Or do I have to have special instruments?
Shiro..u better do it soon...as I need some refferences.. ;p.Thanx bro..!
Actually just sold off my 2L block last month.. so delayed yet again.. :P
Compression ratio doesn't give any ideas on exact valve clearance. Depending on how much stroke you have on the block, valve clearance could be a little or a lot. It's actually quite clear from the formula. To increase compression ratio, you can do two things... reduce the CCV, or increase the SWEPT VOLUME.
you calculate it using the formula in the excel spreadsheet below.. I made it simple so I can use it and not need to remember stuff.
Compression ratio doesn't give ideas about valve clearance. It gives the idea how much air your engine compresses in perfect a perfect 4 stroke engine (which also means that the numbers mean shit, since valve opening and closing timing affects these numbers in reality)
And yes, SCR (static compression ratios are ridiculously high so that you don't have poor compression ratio with larger cam durations)
The formula is there as well, if you want to do it the old fashioned way with a calculator.
Do note that the numbers are NOT to be USED for your application.. the CCV you can use, since I got it off c-speed's CR calculator.. piston dome you have to find it out the old fashioned way.. a buret, and a perspex.
*post the xls spreadsheet later.. editing out some stuff*
OOPS!! J101 is right.. the head gasket height is less than 1mm.. Mine is at .5mm.. :P I forgot if I was using an aftermarket gasket or not. :P
Mixed it up with some other numbers..SORRY to user6 and J101!!!
Wakakakkakaa.. I knew J101 sure remember more things than me.. :P
Sorry again.. I knew I should have measured before shooting my mouth off.. :P
