Hey. I just bought my e30 last week so sorry for my ignorance. But I was looking into putting an i head on my eta. Ive read its a bad idea to keep my stock pistons and just slap the i head on it because the compression ratio will be too low. To solve that, couldn't I just shave down the head a bit? Or would there be interference between the valve and piston if I did that? Thanks in advance for your help.
Announcement
Collapse
No announcement yet.
Another 2.7 Stroker Question
Collapse
X
-
it wont really "solve" the issues of low CR or having non matched piston crown and combustion chamber so i doubt it will make a bigh difference but it might help slightly. cant comment on P to V with this combo not checked that myself.
swapping a freshened head (not a junkyard one) is worth doing, if you do the swap89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
-
Just slap a good i head, harness and sensors. Don't worry about the compression ratio. My 2.7i is a torque monster. Shocking difference, especially with cam and headers. My car ran .5 seconds behind a LS1 Miata all day, and 2 seconds in front of the rest of the class. It moves.sigpic
2011 335i/1995 Mercedes C220 (rallyx)
Comment
-
ok thanks guys. I think that when i eventually do this, i will probably keep my pistons as I dont have much experience inside the actual engine. everything else i can handle.. Any idea where i can get measurements on how much i can mill down the head? I can do that myself as i have access to a machine shop, but i need to know what will be safe
Comment
-
Originally posted by Gary Horneck View PostJust slap a good i head, harness and sensors. Don't worry about the compression ratio. My 2.7i is a torque monster. Shocking difference, especially with cam and headers. My car ran .5 seconds behind a LS1 Miata all day, and 2 seconds in front of the rest of the class. It moves.
Comment
-
And you won't have valve piston contact if you don't mill off more then .25mm or so. If you want to go further, then you can buy a adjustable cam gear from bimmerheads to fix that issue.
A lot if people advice agains a 2.7 build but if you do it right the first time it is definetly worth it. (Keep in mind I completely rebuilt the head and block) a fresh head and block will make a big difference as well.
Comment
-
reminds me of a saying i heard once, " when they cant make hp they start talking about torque....."89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
Comment
-
Originally posted by Gary Horneck View PostAutocross/Rallycross results FTW ;D Only an ass rely's on Dyno data to strut one's stuff.
Comment
-
Originally posted by nando View Postyeah, who needs a dyno test to verify the benefits of engine mods? ;)
honestly for low speed racing a shorter diff does what you need but you get found out on a high speed circuit89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
Comment
Comment