If I put the 12:5 compression pistons
I need 100 octane fuel all the time??

 

at least. depends on how much your engine detonates...

 

12:5 ?! what the hell... i hope to god you mean 12:1 b/c 12:5 would be super duper low compression lol but yes you will need 100+ octane as well as all bolt ons and i would suggest titanium valves and springs as well as a very aggressive cam... but thats just me...

 

super high compression

 

Of course!!!
Iknow All that!!
BUt my question isabout the Fuel
I want build a motor with out Turbo
If i can A 2.2 Stroker
Thanks

 

your fuel question was answered twice

 

ummm no 12:5 is a ratio so 12/5 = 2.4 and 12:1 which is also a ratio so.... 12/1 = 12.... tell me which one is higher please??

 

I hate to say it but he's right. 12:5 is a LOW CR

fact states that 5 out of 4 people have problems with fractions

 

if im thinking correctly.... 12/5 is 12parts air to 5 parts fuel.... thus 12/1 means their is more air making it highter compression..... the more air the more compression......



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that's air fuel ratio, not compression ratio

The ratio between the combined volume of a cylinder and a combustion chamber when the piston is at the bottom of its stroke, and the volume when the piston is at the top of its stroke. The higher the compression ratio, the more mechanical energy an engine can squeeze from its air-fuel mixture. Higher compression ratios, however, also make detonation more likely.

and Incase you're still having problems with this...

12:1|--| 12:5 | |
| | |_ _| Top of stroke
| | | |
|--| |- -| Bottom of stroke

Which one compresses the air more?

yay for a crappy example