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Engine specs.


73colorado02

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I have a 121ti head that has been fitted with what looks like a 300 cam and I will be running it on a 75 block with 9.5 to 1 pistons and 40 webers. So is this possible and could I run maybe even 10 to 1 pistons.

73 colorado orange 2002 in restoration

owned for 30years

71 2002 gone to parts heaven

72 2002 Malaga Sisters

05 Mini S Moms

FAQ member # 31

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Guest Anonymous
I have a 121ti head that has been fitted with what looks like a 300 cam and I will be running it on a 75 block with 9.5 to 1 pistons and 40 webers. So is this possible and could I run maybe even 10 to 1 pistons.

You have an engine that is likely 30 or more years old. Unless you are the original owner and know every historical twist of the engine, ANYTHING is possible and not improbable. You might be running nitrogen in your tires , have aftermarket 8:1 compression pistons and have a wool headliner too.

H

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ooo... wool is itchy...

Well, sure- 10:1 is not unreasonable, if you have good induction and spark.

But for that, you know, you'll need 121- domed pistons...

t

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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Thats what I was thinking now that Ireland engineering is selling custom sets of pistons i was wondering if I should run the 10.1. I have been building this motor in my head since I was 12 and I always wanted the 10.1 but I figured I would just run the 9.5 pistons. With my head and 9.5 do what deck heights do I have to worry about. Thanks Dylan.

73 colorado orange 2002 in restoration

owned for 30years

71 2002 gone to parts heaven

72 2002 Malaga Sisters

05 Mini S Moms

FAQ member # 31

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10:1 might be a little high, especially with the 121 head. The 121 may be susceptible to detonation more so than the E12.

Check with Ireland before you order the pistons. They'll be happy to answer your questions and advise you.

John Capoccia

Sierra Madre, CA

 

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