3.2L NON-VANOS engine possible?

Bmw330is · #1 (**permalink**) 10-08-2002, 11:10 PM

Anyone know if its possible to bore a 2.5L non-vanos engine to a 3.2L and have it run properly? Thanks for any input.

joe325 · #2 (**permalink**) 10-09-2002, 12:18 AM

i would doubt it... thats a lot of metal your scrappin out to go from 2.5 to a 3.2... thats A LOT of sidewall dude... .7 litres? thats a lot of stuff... i donno... i know early e36's are made from iron and have wider side walls... so it might be possable.. id be hesitant to bore out something that extreme.

ayton · #3 (**permalink**) 10-09-2002, 12:31 AM

No...it can't be done safely as Joe said. the block would blow itself up.

Bmw330is · #4 (**permalink**) 10-09-2002, 01:02 AM

Ok, thanks for the info guys.

bungy42 · #5 (**permalink**) 10-09-2002, 02:20 AM

Ok, but could you convert a 3.2 to non-vanos? Keep the original 3.2 block, pop on a non-vanos head, swap cams, maybe a port/polish, and some custom software. That sounds easier than boring/stroking a 2.5. The stroke gets you to 2.9 (I think), so then you need to bore out 0.3 more, which is still a lot. Hmmm, if I had the money I'd give it a shot...

Alex Mc · #6 (**permalink**) 10-09-2002, 02:41 AM

Actually, early '91 and some '92 325's have stouter blocks because they were the first production years, and companies tend to put a little more meat on the block in early life of an all new motor. So, you can bore these out to 86mm, which is essentially a 3.2 with the crank (ok fine, 3.2 spec is really 86.3mm, but its within 10cc's!).. and use your non-V head.

Keep in mind, the non-V system has a 4-volt MAF though, so you can't run the Euro MAF (later models are 5V), there are som problems there.. plus cam options.

ayton · #7 (**permalink**) 10-09-2002, 03:23 AM

Quote:

Originally posted by Alex Mc
Actually, early '91 and some '92 325's have stouter blocks because they were the first production years, and companies tend to put a little more meat on the block in early life of an all new motor. So, you can bore these out to 86mm, which is essentially a 3.2 with the crank (ok fine, 3.2 spec is really 86.3mm, but its within 10cc's!).. and use your non-V head.

Keep in mind, the non-V system has a 4-volt MAF though, so you can't run the Euro MAF (later models are 5V), there are som problems there.. plus cam options.

do you think it would be worth the trouble though?

joe325 · #8 (**permalink**) 10-09-2002, 08:51 AM

id still be hesitant on it.... you would need A LOT of custom work done to do that... it would be hella expensive.. it would be safer, and about the same price if not a lil more to just get your car blown.
just my ideas though...
anyone else able to chime in?