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Guest Anonymous

My 72 has 121ti stamped into the head, I bought the car with

a 32/36 weber installed, sans smog system. The pistons are

flat top, does this head differ from the 121 heads?

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Guest Anonymous

2002sm.jpg

there was was a post about this about a year ago. i don't think anyone ever found anything different between 121 and 121ti heads.

steve k.

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Guest Anonymous

can I bolt an e12 head to the block that had 121ti originally?,

I was going to get a tii exhaust manifold anyway, but will the

intake line up to the e12, I have a 32/36 with peanut shape

carb intake? thanks

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Guest Anonymous

2002sm.jpg

URL: http://www.bmw2002faq.com/reference/pistons/pistons.html

the combustion chanbers will be different. Thus you will have to match the pistons to the head. i am not sure if the flat tops will work with e12 head, but i cannot see the reason why not.

flat tops are lower compresion so you might not be getting as much power as you coould.

check out the link above for the OEM piston guide.

steve k.

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Guest Anonymous

hey Steve K thanks for the line to the piston guide. There is a

higher comp. piston listed for the 121tii motor, will these work

with a 121 or a 121ti head and my old trusty weber? I need to

rebore and rebuild the bottom end, so I'm trying to figure out if

either of these heads I have will work and what pistons to

use, any help from you or other mechanics greatly

appreciated. Does the 121tii head have bigger intake

valves? thanks

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Guest Anonymous

10:1 are hard to find. I have a 121ti head with big valves. The 121 heads are unclear. I THINK!!... If the car had a one barrel carb, the 121 head had small valves. If it was a two barrel, it would have big valves. With 10:1 - Fuel could be a problem - premium plus! - tuning will have to be bang on.

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