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Re: Trying to squeeze out a little more gas mileage [Re: Jeff Ogden] #1311163
Sun May 19 2019 04:56 PM
Sun May 19 2019 04:56 PM
J
Joe H  Offline
Shop Shark
Joined: Feb 2000
Posts: 3,933
Lee's Summit Mo. 64086
Took mine out for a drive after cleaning the carburetors. Local highway, slight up and down, no major hills but not flat either.

250 inline 6, dual W-1 Carters, 3.08 gear, T350 auto trans with 1:1 output, 28" tall tire, 3300 lbs, 18.5 vacuum at idle (600 rpm)

At 65 mph, on the level, 11 - 12 on the vacuum gauge, 16.5:1 on the A/F ratio, 2450 rpm.
At 65 mph, up hill, 9 on vacuum gauge, 15:1 A/F ratio, 2400 rpm
At 70 mph, down hill, 14 on vacuum gauge, 17:1 A/F ratio, 2450 rpm.

This is the same it ran last year, got 21 mpg on a 300 mile trip.

Re: Trying to squeeze out a little more gas mileage [Re: Jeff Ogden] #1311169
Sun May 19 2019 05:20 PM
Sun May 19 2019 05:20 PM
H
Hotrod Lincoln  Offline
Boltergeist
Joined: Feb 2004
Posts: 18,597
Dellrose, TN
Good gas mileage- - - - -but what's the piston mileage on one running that lean? You're right on the ragged edge of destructive detonation, especially if the ignition timing is advanced just a tiny bit above optimum. Gasoline is cheaper than engine parts!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Trying to squeeze out a little more gas mileage [Re: Jeff Ogden] #1311206
Sun May 19 2019 11:48 PM
Sun May 19 2019 11:48 PM
J
Joe H  Offline
Shop Shark
Joined: Feb 2000
Posts: 3,933
Lee's Summit Mo. 64086
I can run a fair bit more timing and lean due to the 8.0:1 compression. On average, the A/F ratio is much lower, these numbers are just when I looked at the gauge. It would need to be graphed out to see the true average.

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