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I NEED HELP!

Started by Carterc, March 14, 2011, 09:46:17 AM

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Pat Conlon

#30
March 15, 2011, 12:36:29 AM
Quote from: racerman_27410 on March 14, 2011, 11:49:43 PM
my 1349 motor has 10:25 compression pumping 200 PSI....... runs great on pump gas.  

That sounds about right. Thinking in simple terms of relating compression pressure vs. surface area of piston:

If stock compression is 180psi (new motor) and stock piston size is 77mm dia. (a= 4654) then Frank's  82mm piston (a=5278) with ~12% more surface area should be able to run ~12% more compression pressure: ~201psi, and have the same ratio as stock.

However, if Carterc's bike has compression of 200+ psi and 77mm pistons.....I would be careful with pump gas.
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3
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