91 and 100 octane fuel

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Zacke
Staff Sergeant
Posts: 370
Joined: 27 Sep 2018
Location: EDNY

91 and 100 octane fuel

Post Zacke »

Hey guys,

I'm going to do an around the world trip with the P40 and want to simulate the limited availability of fuel in remote locations.

The question is: Where are the P40's limits with 91 octane fuel? With the Spit the limitations were quite clear via manual and forum.

Any suggestions here for the 91 octane fuel with the P40?

Thanks in advance,
Zacke
Last edited by Zacke on 16 Feb 2023, 15:02, edited 1 time in total.

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ratty
Technical Sergeant
Posts: 792
Joined: 29 Oct 2013
Location: KPMP

Re: 91 and 100 octane fuel

Post ratty »

Interesting question. I'm going to do more research, but the limitation is the maximum manifold pressure you can safely use. At sea level in the P-40 you can apparently get up to 41"; with 91 octane I would recommend going no higher than 35" with a rich mixture, and lower than that when you lean. Since you don't have an EGT gauge, keep an eye on the coolant temp, which will be higher than normal if you're experiencing detonation.
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ratty
Technical Sergeant
Posts: 792
Joined: 29 Oct 2013
Location: KPMP

Re: 91 and 100 octane fuel

Post ratty »

Or you could poke through this:

https://www.docdroid.com/ibKHk6m/curtis ... df#page=10

Excerpt:

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