Twin Turbo LSX Datsun 280Z
#1302
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Originally Posted by bramagedained
I definitely need to make it to TX2k again when I have my Datsun finished.
Did you run the F150/Explorer axles parts at all or go right to the DSS ones with Will's rear swap?
Did you run the F150/Explorer axles parts at all or go right to the DSS ones with Will's rear swap?
#1309
9 Second Club
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Who said it cools combustion ?
#1310
TECH Fanatic
#1311
9 Second Club
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Nobody claimed it cooled combustion, so it is irrelevant. Cooler charge temps on the other hand do matter.
Chamber temps will largely be dictated by fuel used and tuning.
Chamber temps will largely be dictated by fuel used and tuning.
#1312
8 Second Club
iTrader: (4)
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The purpose of cooler charge temps is to lower the CC temp. So nitrous may cool the air charge a tad on its way to the CC, but once it gets there it’s going to elevate the combustion temps well past what they would have been without nitrous. If you’re octane limited in the first place and are trying to get away from that with cooler charge temps, nitrous will make the engine more prone to detonation, not less.
#1313
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Nitrous comes out of the nozzle at -56 degrees which cools the incoming charge of fuel and air making a much denser mixture.. In simple terms it means you can pack more fuel and air and still keep a workable A/F ratio. More Fuel with more O2 means more power. The byproduct of this is more heat at the end of the cycle.
#1314
9 Second Club
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I don't buy that. You can only compensate for elevated CC temp. so much with enriched fueling.
The purpose of cooler charge temps is to lower the CC temp. So nitrous may cool the air charge a tad on its way to the CC, but once it gets there it’s going to elevate the combustion temps well past what they would have been without nitrous. If you’re octane limited in the first place and are trying to get away from that with cooler charge temps, nitrous will make the engine more prone to detonation, not less.
The purpose of cooler charge temps is to lower the CC temp. So nitrous may cool the air charge a tad on its way to the CC, but once it gets there it’s going to elevate the combustion temps well past what they would have been without nitrous. If you’re octane limited in the first place and are trying to get away from that with cooler charge temps, nitrous will make the engine more prone to detonation, not less.
Nobody that I know of. The purpose of cooler charge temps is simply cooler charge temps which in turn can help reduce chances of pre-ignition prior to spark ignition.
Once combustion has actually taken place, charge temp will have had very little impact on this
If the same fuel is used and you add nitrous, then of course there is a chance that chamber temps will be higher, but again that's largely down to fuel used. No different than chamber or EGT temps varying very little whether you use 10psi or 30psi.
Some fuels burn cooler, some hotter...if you really want cold chamber temps use water injection. You could even cool it so much as to extinguish the flame lol
#1316
8 Second Club
iTrader: (4)
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And once again, who said nitrous will cool combustion ?
Nobody that I know of. The purpose of cooler charge temps is simply cooler charge temps which in turn can help reduce chances of pre-ignition prior to spark ignition.
Once combustion has actually taken place, charge temp will have had very little impact on this
If the same fuel is used and you add nitrous, then of course there is a chance that chamber temps will be higher, but again that's largely down to fuel used. No different than chamber or EGT temps varying very little whether you use 10psi or 30psi.
Some fuels burn cooler, some hotter...if you really want cold chamber temps use water injection. You could even cool it so much as to extinguish the flame lol
Nobody that I know of. The purpose of cooler charge temps is simply cooler charge temps which in turn can help reduce chances of pre-ignition prior to spark ignition.
Once combustion has actually taken place, charge temp will have had very little impact on this
If the same fuel is used and you add nitrous, then of course there is a chance that chamber temps will be higher, but again that's largely down to fuel used. No different than chamber or EGT temps varying very little whether you use 10psi or 30psi.
Some fuels burn cooler, some hotter...if you really want cold chamber temps use water injection. You could even cool it so much as to extinguish the flame lol
I love the stuff. 100 shot right around you’re NA stall point for 300-500 RPM will light things off in a hurry.
#1317
9 Second Club
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Show some evidence that nitrous skyrockets combustion temps ?
Obviously cylinder pressures will rise....the engine will make more power. That's given for any power increases
Combustion temps do not cause pre-ignition. Pre-igniton only occurs prior to any spark ignition and therefore combustion. However chamber temps prior to combustion may cause pre-ignition....which is less likely with nitrous because of that cooling effect. Unless of course too much is used in which case compression alone could cause the mixture to pre-ignite which is a slightly different scenario
Temperatures can play a role with detonation post spark ignition...but again the cooling effect of nitrous would help in that respect, however the huge increase in oxygen content may have a negative effect.
And as much as nobody said it cooled combustion temps, who said nitrous was a replacement for an intercooler ?
I dont see anyone saying that either. But it is 100% fact nitrous will help cool the inlet charge.
And another thing is for sure, it will give an ability to make more power.
Obviously cylinder pressures will rise....the engine will make more power. That's given for any power increases
Combustion temps do not cause pre-ignition. Pre-igniton only occurs prior to any spark ignition and therefore combustion. However chamber temps prior to combustion may cause pre-ignition....which is less likely with nitrous because of that cooling effect. Unless of course too much is used in which case compression alone could cause the mixture to pre-ignite which is a slightly different scenario
Temperatures can play a role with detonation post spark ignition...but again the cooling effect of nitrous would help in that respect, however the huge increase in oxygen content may have a negative effect.
And as much as nobody said it cooled combustion temps, who said nitrous was a replacement for an intercooler ?
I dont see anyone saying that either. But it is 100% fact nitrous will help cool the inlet charge.
And another thing is for sure, it will give an ability to make more power.
Last edited by stevieturbo; 02-05-2016 at 04:32 PM.
#1318
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Originally Posted by Forcefed86
Let’s not dance around 3 other topics. What is the point of an “effective charge cooler” if it sky rockets the CC temps/pressures? Combustion temps are what matter, they are what causes pre-ignition/detonation. Regardless of the charge temp drop the end resulting CC temp will be higher using an accelerant. Even with the aid of higher octane fuel injected with the nitrous, the overall CC temps/pressures will be higher. My point is, It’s nothing like an IC and shouldn’t be compared to or used in place of IC.I love the stuff. 100 shot right around you’re NA stall point for 300-500 RPM will light things off in a hurry.