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> Higher compression 7AFE
post Oct 1, 2009 - 9:05 AM
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stephen_lee



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So I want to build my 7a with a little higher compresson (11-12:1) for a slight power increase and a nice increase in efficientcy and 'peppiness.' Upon searching I found little to no information about where I can get a set of high CR pistons w/o having to mod the rods and whatnot. So does anyone know who, if anyone. caries a higher CR piston for the 7a? If not, where i can get a good set of customs from? This is on a spare 7a so no big deal if i have to wait/ship my stock pistons. And does anyone know about rod bolts? I know thats one of the 7a's weak spots so if ARP has any bolts to fit that'd be great, or if anyone knows of some stronger bolts... I like to beat my engines so it'll have to be strong enough to handle my habits. rolleyes.gif

shorthand:
1.) Where can i get higher CR pistons for the 7a? (11-12:1)
2.) How can I beef up my rods/rod bolts?
3.) Don't flame about my building choices, I went this way for a reason.


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post Oct 6, 2009 - 7:35 PM
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Bitter

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a .5 bump in CR won't even really be noticable. 11-12:1 is getting up there. 9.5:1 is stock. you can't just bump CR without other changes, the cams are ground to work with stock CR and the cam timing is set that was as well. you'd need different ground cams as well as adjustable cam gears to take full advantage of it.

my advice and the cheapest way to add a little 'pep' to the 7afe is...set timing to 13-15 BTDC and throw a wrapped ebay header on it along with a cold air intake. no earth shattering gains but its something you'll feel in the seat of your pants and way cheaper to do. also shouldnt hurt mpg any and you can get away with midgrade fuel.


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