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Author Topic: Afr reading  (Read 1826 times)
Garrick Clark
Sr. Member
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Posts: 499


« on: February 24, 2019, 11:32:28 am »

Hi. I'm using a pair of 40 dells on my N/A engine.
When I drive it at a constant speed, say 60, 1/3 rd throttle opening I'm at 13.1. Then when I lift off the throttle the gauge shows 10.

Sussed it. On over run , throttle is closed ,so vac pulls fuel out the mixture screws and no AIR will enter the engine  because of closed throttle plates resulting in a rich mixture which shows me 10 on the gauge.
« Last Edit: February 25, 2019, 15:49:22 pm by GARRICK.CLARK » Logged

Air cooled Engine builder
Martin S.
Hero Member
*****
Posts: 990



« Reply #1 on: February 27, 2019, 01:10:02 am »

Interesting. That’s likely why my fuel injection system has a deceleration cut off.
It can feel like an electric brake on a circular saw  Tongue
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Cal Look white 68 Bug with AJ Sims EFI Turbo 2332. 194hp 240tq @ 5500 rpm 3psi boost.
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