Guest Anonymous Posted April 4, 2003 Share Posted April 4, 2003 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? Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted April 4, 2003 Share Posted April 4, 2003 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. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted April 4, 2003 Share Posted April 4, 2003 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 Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted April 4, 2003 Share Posted April 4, 2003 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. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted April 4, 2003 Share Posted April 4, 2003 (nt) Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted April 5, 2003 Share Posted April 5, 2003 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 Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted April 5, 2003 Share Posted April 5, 2003 it will not let your engine breath. steve k Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted April 7, 2003 Share Posted April 7, 2003 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. Quote Link to comment Share on other sites More sharing options...
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