Bobert healetty 0 Posted March 1, 2006 OK my motor has alot of stuff done to it (performance wise) and i installed the charger and it kept blowing oil seals(long story) apparently the place that built the motor put custom 2.0L forged pistons over bored the cylinders shaved the head and left the stroke stock im guessing this would up the compression? the shop that last had the head off...shimmed two OEM headgaskets together so they could lower the compression and install the charger(it was pinging with the supercharger installed because of too high compression) they used some type of sealent on the head gasket now the head is very hard to get off...my question is what could be the compression ratio that it was raised too? i do not have all the measurements because i have not taken the engine apart yet...once i finally get the head off is there anyway i can use one head gasket and keep the high compression and still use the charger? maybe use a larger pulley to lower boost? i wonder how the car performs with the supercharger bypassed and with the stock headgasket..(higher compression) Quote Share this post Link to post Share on other sites
Bobert healetty 0 Posted March 1, 2006 anyone driven a high compression N/A g60? Quote Share this post Link to post Share on other sites
gaz the geezer 0 Posted March 1, 2006 give this a go bobert http://e30m3performance.com/myths/more_ ... _ratio.htm Quote Share this post Link to post Share on other sites
GazzaG60 0 Posted March 1, 2006 you need to work out compression ratios. ive heard of det issues on G60s over 9:1 due to poor combustion chamber design. the G60or PG as we know it should be low compression, high boost for best results, however it would be nice to see a properly mapped one running high compression. with a bigger cam and some headwork a 7000rpm G60 is on the cards with a standard pulley Quote Share this post Link to post Share on other sites
