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Old 12-26-2006, 08:03 PM
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Will this run on 93 octane?

Just wondering....
383 sbc stroker.
5.7 h beam rods.
speed pro pistons.
combustion chamber size is 64.
head gasket thickness is .039, im not sure about the head gasket bore, maybe 4.180? if someone could help me on that too.
piston to deck cleaence i think is 0 or possible .020.
valve releif is 3.40. flat tops.
cam specs: lift .520''/.540'' Duration 282/290.
I cam up with a quench of .039.
and a compression ratio of 11.3:1
Im really not sure if my calculations are right, this is my first time doing this, so pleasure correct me, and also tell me if this will run on 93 octane(maybe a lil octane booster) thanks alot.

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Old 12-26-2006, 08:07 PM
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O yea....i also got a calculated dynamic compression ratio of 8.9 if that helps any
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Old 12-26-2006, 08:52 PM
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I seriously doubt that 11.3:1 comp will run on pump gas even with octane booster...my 10:1 383 stroker barely runs on 93, i have to keep the timing way off to keep her going with out detonation...which it still does from time to time
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Old 12-26-2006, 09:10 PM
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Maybe i should run a set of dished piston with about a -12.00 to brin the static compression down to 10.2:1 and a dynamic of 8.1:1.
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Old 12-26-2006, 09:12 PM
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Quote:
Originally Posted by 73camaro
Maybe i should run a set of dished piston with about a -12.00 to brin the static compression down to 10.2:1 and a dynamic of 8.1:1.
oops i ment +12.00
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Old 12-26-2006, 09:16 PM
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Quote:
Originally Posted by 73camaro
Just wondering....
383 sbc stroker.
5.7 h beam rods.
speed pro pistons.
combustion chamber size is 64.
head gasket thickness is .039, im not sure about the head gasket bore, maybe 4.180? if someone could help me on that too.
piston to deck cleaence i think is 0 or possible .020.
valve releif is 3.40. flat tops.
cam specs: lift .520''/.540'' Duration 282/290.
I cam up with a quench of .039.
and a compression ratio of 11.3:1
Im really not sure if my calculations are right, this is my first time doing this, so pleasure correct me, and also tell me if this will run on 93 octane(maybe a lil octane booster) thanks alot.
How did you get those compression numbers? There are too many variables.
1) Octane compatability depends on the chosen chamber shape.
2) Using the variable of your head chamber/bore ratio you have a variation of .4+
3) The head gasket could be a variation of .1+
4) Valve reliefs volume is not the same as piston volume which measures from the rings up.

You need to get some specifics before you make a big mistake.

Octane booster is a marketing joke. The maximum recommended dosage increases octane .8 that's point 8 of ONE octane.

Yes it will run on 93 or even 87. But will it run well? You can crank back the timing to make it run on 87 but power and response will probably suck.

You might look into head grooving.

Singh's Grooves in Ported & Milled vortec heads on stock 350


Remember you can build a 450 hp engine with a fuel problem or a 435 hp engine that will run on 87. Your choice.
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Old 12-26-2006, 09:16 PM
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that should prolly work nicely with aluminum heads
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Old 12-26-2006, 09:31 PM
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Quote:
Originally Posted by xntrik
How did you get those compression numbers? There are too many variables.
1) Octane compatability depends on the chosen chamber shape.
2) Using the variable of your head chamber/bore ratio you have a variation of .4+
3) The head gasket could be a variation of .1+
4) Valve reliefs volume is not the same as piston volume which measures from the rings up.

You need to get some specifics before you make a big mistake.

Octane booster is a marketing joke. The maximum recommended dosage increases octane .8 that's point 8 of ONE octane.

Yes it will run on 93 or even 87. But will it run well? You can crank back the timing to make it run on 87 but power and response will probably suck.

You might look into head grooving.

Singh's Grooves in Ported & Milled vortec heads on stock 350


Remember you can build a 450 hp engine with a fuel problem or a 435 hp engine that will run on 87. Your choice.
You had me until "head grooving" call me a skeptic, but if I were going to "experiment" with grooves it would be in something a bit more disposable, like pistons!

Now I've done it! Here come the flames!!!
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Old 12-27-2006, 08:12 PM
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Quote:
Originally Posted by 71C10
You had me until "head grooving" call me a skeptic, but if I were going to "experiment" with grooves it would be in something a bit more disposable, like pistons!

Now I've done it! Here come the flames!!!

I agree. Skepticism is good.

It is the principle of the grooving that helps. Reducing detonation at lower rpm /high BMEP.

I believe grooves help..... and at worst, can't hurt.

If you get convinced, try them. If not...... don't.

Hey I'm only talking $ 80 year difference in gas prices.
Sorry, did not intend to hijack this.
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