Perk engine for the Spit :)

[Bombjack]

Lephturn, since high-octane fuel is an anti-detonant, and detonation is what stops running high MAP, we're asking for the same thing.

I guarantee Johnson's P47 was using 150 octane.

(edit)
As an aside, FWIW a tuned up Spitfire would routinely go up to 81" MAP.

[This message has been edited by Bombjack (edited 02-05-2001).]

[Jimdandy]

 

Originally posted by Bombjack:
Lephturn, since high-octane fuel is an anti-detonant, and detonation is what stops running high MAP, we're asking for the same thing.

I guarantee Johnson's P47 was using 150 octane.

(edit)
As an aside, FWIW a tuned up Spitfire would routinely go up to 81" MAP.

[This message has been edited by Bombjack (edited 02-05-2001).]

Yes, high octane fuel was the norm for US rides. The Germans had to deal with a very limited fuel and refinery capacity. That's why they used low octane fuels. The little triangles buy the gas cap on the 109's indicated the octane rating needed in that plane. 87-octane was very common in the 109's. I think that was a yellow triangle. I think the G-10 might have had a red triangle That designated 100-octane. It was something like that. I'm sure there are some LW guys on here that could tell you exactly. It was a big factor in the ease of making a high alt performer. That was part of the reason for the large capacity WEP systems on the LW rides. You can't build as much cylinder pressure on low octane gas so you have to find other means of getting power out of the engine. As Bombjack said detonation is the problem. Just like putting low octane fuel in a high compression/boost car. It will detonate under load and beat the low end up and burn holes in pistons.