Pump gas, how fast can you go?
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The King
Joined: Jul 2003
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Pump gas, how fast can you go?
Does anyone have any idea about how fast you can go running just 93 octane? I have a regular old SBC with a plate NOS kit. How fast have people been able to go and still run pump gas? Any thoughts?
Mark
Mark
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I can go roughly 600 rwhp on 93 octane. ETs and traps are still TBD.
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my 91 Gt went 10.20 on pump gas. Prolly coulda went alot faster but this was pre wideband tuning days for me, so I always played it safe.
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The King
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If I remember correctly, just a few months ago CHP mag did an artical on a BBC which made over 1000 HP on 93 octane. I don't know how streetable it would be, but I wonder. The way I see it is as long as you can control detination the sky is the limit. We run race fuel so we don't have preignition, right? If I make 600 on the motor and I spray 300 to it, as long as I am not melting spark plugs, what's the problem?
Mark
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Mark, I noticed that you used the terms "detonation" and "preignition" interchangebly while they are actually two different things. I'm sure you know the difference but there are many that do not, so for them...
Photo of Pre-ignition damaged piston
Photo of detonation damaged piston
Article: HERE
But I do agree with you that if you can control those two factors through fuel management, timing, etc. the sky is the limit for how far you can push an engine...as long as the engine is capable of withstand the HP that is being made.
Pre-ignition, as the term suggests, is the ignition of the fuel-air mixture before the regular ignition spark from the spark plug. If the regular spark occurs shortly after the pre-ignition, the colliding of the two flame fronts will cause a pinging noise. Preignition causes loss of engine power and can cause severe damage to pistons, rings and valves.
Photo of Pre-ignition damaged piston
Abnormal operation may allow combustion pressures to develop so fast that the heat and pressure will "explode" the remaining unburned fuel. This produces the knock, often called "ping", carbon knock, etc. Actually this is detonation. The knock results from the violent explosion when the normal flame front runs into the secondary flame front. Detonation will cause piston and ring damage, top ring groove wear, scoring, sticking rings, loose head gaskets and possible complete engine failure.
Photo of detonation damaged piston
Article: HERE
But I do agree with you that if you can control those two factors through fuel management, timing, etc. the sky is the limit for how far you can push an engine...as long as the engine is capable of withstand the HP that is being made.
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Octane requirement is greater the smaller the displacement.
Also pump gas is to be defined as 93..not 116 you got from a pump.
Only way I see to get big power on pump gas is big cubic inches with mild compression. Nitrous..no way without melting stuff.
HTH
I run pump gas..93 with alky
Also pump gas is to be defined as 93..not 116 you got from a pump.
Only way I see to get big power on pump gas is big cubic inches with mild compression. Nitrous..no way without melting stuff.
HTH
I run pump gas..93 with alky
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The Later model Gm cyl heads ie the LS1 and LS6 are far superior to those in the hot street SBC. The combustion chambers are far evolved from the SBC's and when modified are yet farther ahead. I have been able to do numerous 12:1 vehicles on 93oct and no knock, when there was spk knock I could just retard under peak torque and all is well. I have yet to see an all out setup that really pushes it as far a compression and power in a genIII SBC.
Al or hybridSS is probably the closest to this as of now making 707RWHP and 721RWTQ on a bit of spray. I know of a few TT setups making over this power level on 91oct.
Jeremy Formato
Al or hybridSS is probably the closest to this as of now making 707RWHP and 721RWTQ on a bit of spray. I know of a few TT setups making over this power level on 91oct.
Jeremy Formato
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456HP 412TQ stk heads custom cam much more to come ....
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