2mm Head Gasket on rb20

[Carryl]

like the topic says i run a 2mm FET sport metal head gasket on my rb20, reason being simply it was available when i was servicing the motor. The rb20 was my first project so i really never took into consideration the compression change said gasket would cause. Anyway, i'm trying to calculate the current compression ratio on the tomei site they rate the rb20 to have a compression of 8.1 : 1 with their 1.8mm gasket. I estimate then with the 2mm its somewhere stupid low like ~7.9:1. Which would explain alot of issues ive had with turbo spool times and responsiveness.

All that being said do you guys think its worth while to go in now and replace the head gasket again with a less thick unit or can i just tune in more timing to get the low end responsiveness back?

[mean240]

the more you lower the compression the more boost you'll be able to run!!!

dont replace the gasket. leave it alone and turn up the boost , but make sure you can run it safely.

[eh?]

If it's a daily driver I would definitely change it back to stock 7.9:1 is ridiculously low.

[TwinCityTech]

ya id just go with the tomei metal gasket- 1.5 (i think thats the stock thk.)

[Cjmartz2k]

No, 1mm is stock, and that's what you should run. Bigger head gasket does lower compression, but it also changes the "squish" of the head which can increase the likelihood of knock. Stock or 1.2mm, especially on a 20.

[themadscientist]

Saved me the trouble of saying that same thing.