Injectors

You can run 93 octain with up to 10.7 compression but that would be the limit. After that you would need some addative. Now this is on a n/a engine. So if you boost with 10.5 im sure u would need some good fuel with some good additives (no cheap stuff!!!) and ob1 so you can control your timing because you would have to retard some under boost and a good fuel management! If im wrong will some one on here correct me plz?

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Originally Posted by cygnus x-1

Even the valve reliefs? That's really cool then. I'm not ready to rebuild my block just yet so I'll be going the extreme milling route. With the later stock A20A3 pistons, 1mm off the head gets you 10:1. 2mm off the head gets you 11:1.


10.5:1 + turbo would be awesome. Lots of care needed with the fuel and tune though. What grade fuel can you run with 10.5:1?


C|

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The only difference in valve reliefs is the 4th one.
You can custom order pistons with only 3 reliefs for right around the same price.

I ran 91 octane fuel. We dyno tuned to 13.8 psi, with out any problems.
I am changing some things right now and i will be turning the boost up and I am switching to e85.

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Originally Posted by stephensimmons

You can run 93 octane with up to 10.7 compression but that would be the limit. After that you would need some additive. Now this is on a n/a engine. So if you boost with 10.5 I'm sure u would need some good fuel with some good additives (no cheap stuff!!!) and ob1 so you can control your timing because you would have to retard some under boost and a good fuel management! If I'm wrong will some one on here correct me plz?

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seems that you are doing some homework..

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Originally Posted by stephensimmons

You can run 93 octain with up to 10.7 compression but that would be the limit. After that you would need some addative. Now this is on a n/a engine. So if you boost with 10.5 im sure u would need some good fuel with some good additives (no cheap stuff!!!) and ob1 so you can control your timing because you would have to retard some under boost and a good fuel management! If im wrong will some one on here correct me plz?

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i run 91 octaine with 10.5 comp...with no prob

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Originally Posted by 89T

The only difference in valve reliefs is the 4th one.
You can custom order pistons with only 3 reliefs for right around the same price.

I ran 91 octane fuel. We dyno tuned to 13.8 psi, with out any problems.
I am changing some things right now and i will be turning the boost up and I am switching to e85.




seems that you are doing some homework..

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Well ive built turboed 86-93 mustangs and worked on a 2004 GTO with the rear mount turbo system and ive built an tuned my brothers supercharged 2006 silverado. All of those vehicles had parts made to order for them from anyone u wished but not im working on the 3g its a little harder because not many part are avalible so you gota no what to use to make it all work. So yea i have been tryna do some home work after being outa school sence 1994!

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Originally Posted by 89T

no you will need to bore the block also. 83mm
everything else is fine...

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Ive been looking for the b18a pistons and i only see them in 81mm and 81.50mm standard bore size. Are these the rite one 89T? I know you said 83mm is that oversized or standard? :help:

83mm is the correct size, try JE pistons....

they are way larger than the stock b18a pistons.

Ok. I didnt no if 83mm was the stock size or not. So if its way larger than stock that means that the 81mm or 81.5 is probly the stock size so im looking at the rite b18a pistons then. I dont wana go no larger than i have to on the pistons I just want 10.5 to 11.0 compression so when i add my cam and port the head and other stuff i want it to respond well and not be lazy.

Being I got my engine tore down can I put my 450cc blue tops in and adjust them to run with my apexi-safc? Im not boosted yet but would like to put them in while its apart or should I wait?

jesus i love this site. i learn so much.

btw i was always told that boosting on anything above 10:1.1 was rather dangerous? anyone carw to explain to me how you guys do it.

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Originally Posted by Nio

jesus i love this site. i learn so much.

btw i was always told that boosting on anything above 10:1.1 was rather dangerous? anyone carw to explain to me how you guys do it.

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With Very GOOD gas and proper timing control. And I do mean good gas and timing control! Now can I get my answer?!...............Then again never mind........Ill jus do it like I should have done in the first place. And by the way, where I live I can get up to 116 octain fuel and I can use a boost controler to turn the boost down to about a pound or two went I dont want to buy that stuff because its rather exspensive and just run off motor.