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Engine Rebiuld Questions


Guest Anonymous

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Guest Anonymous

I am getting ready to rebuild a motor for my 1970 2002. I have a E21 head that I am planning on using but I am having a hard time figuring out what pistons to use. The only real option I have been able to find is to buy a set of forged pistons. The price is a little higher then I was hoping. Is there any other option out there or should I just spend the money.

Is there any bennifit to boring the motor out to a 2.2 liter and is this possible are the piston walls thick enough

I want to run around 9.5 to 1 compression with a 292 or 304 cam.

Thanks

Mark

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Guest Anonymous

Why going with forged pistons?? i run turbo on mine without forged.

As for the piston design, if you want to get 9.5:1 with a e21 you will need some custom pistons because the e21 was for the 320 design, wich i never seen other piston than flat top (under the 2.0L type)wich gives a 8.3:1 ratio. 1.8 320i use totaly different pistons so forget it.

But on the other side, i think some ti/tii pistons for the e12 design might work with the e21 head design. Double check before asuming what i said.

Boring out the block to its limit might yield to problems of reliability, but the worst is that you will need a m3 head gasket because of the 92mm+diameter of the bores.

Pat

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Guest Anonymous

for the e21 head euro 320s. I think that compression ratio is quite hard to find 'new' today. You may want to talk to an 02 specialty shop to see if they can hook you up. You may need to try a piston manufacturer other than mahle too. There are brands other than mahle that are OEM, like KS. -J

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Guest Anonymous

From BMW or any of the OEM"S the only pistons you can get for the E21 head are the flat tops. They used to make domed pistons for those in 9.0 or 9.2:1 compression, but those are all NLA now both through BMW and Mahle. If you want to get around 9.5:1 compression you'll either need custom pistons or you'll have to use an E12 head instead, for which 9.5:1's are commonly available.

Matt

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Guest Anonymous

They are very good for a racing application as they are lighter and available in all sort of compression ratio.

Get a set of cast ones.

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Guest Anonymous

Not so true...

I have run forged pistons in numerous different applications without noise or oil consumption. One did burn a fair amount of oil, but that was through worn turbo seals ;)

There are numerous manufacturers of QUALITY forged pistons. JE, Arias etc etc. Something for everyone :)

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