can i do better?
Thread Starter
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Mountain Pass
Joined: Mar 2006
Posts: 101
Likes: 1
From: Dayton
my friend is going adjust it for me because he's done it hundreds of time before and has all the tools and speical instruments. he's also going to check out the rest of the engine for me tomarrow. ill post and up-date tomarrow evening to tell ya guys what he finds.
Thread Starter
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Mountain Pass
Joined: Mar 2006
Posts: 101
Likes: 1
From: Dayton
ok, today was interesting. first my friend adjusted my carb, then made sure that everyting else wasa in order, but the truck still wouldn't idle smooth. we checked all the wires and plugs, nothing was wrong with either. then we checked each cylinder by put one plug wire at a time to see if it made a difference, it was #7. we were then going to do a compression test but he didn't have the right plug size for his tester. so i then took the truck over to the guy that rebuilt the engine and his guys did a compression test, it was lower than nomal. so they started tinkering around testing different things. and the problem was that the power brake booster was leaking and it was causing the #7 and #4 to fowl up, because my power brakes get their vaccum power off the manifold and not from the carb. i already replaced the the power brake booster and it runs alot better at idle.
Senior User
Joined: Oct 2004
Posts: 337
Likes: 0
From: Lost Wages, NV
OK, my political 2-cents worth... These rigs were designed in an era when gas was dirt cheap and no matter how good you make it, it's never going to be GOOD. I get 15mpg running downhill (literally--100 mile run from 5000ft to less than 3000), but otherwise I can count on 10mpg with a 360. I'm not saying gas can be 30-cents/gallon again, but just something to keep in mind when you hit the polls in November...
Senior User
Joined: Jun 2002
Posts: 279
Likes: 0
From: Brighton, Colorado
Speedo off mark? Brakes dragging? All my past experience I haven't found any FE that couldn't do 12mpg. I'm on my fourth. Even that one get's 12. Seems to be the magic number.
Peace and good luck
Peace and good luck
Cargo Master
Joined: Sep 2004
Posts: 2,691
Likes: 6
I have a 72 F100 with 360 and stock 2bbl carb. It got 10 mpg like clockwork after I rebult carb, tune-up, Pertronix, Flamethrower, etc. I started using acetone at the 3 oz/10 gal and now I get 13-14 like clockwork. I've been doing this for over a year. When I stop using acetone the mileage drops to 10-11 in 2-3 tanks. I put acetone back in and it goes back to 13-14. Driving the speed limit also helps in that. I can get that 14 down to 12 by lead-footing it.
Senior User
Joined: Oct 2004
Posts: 337
Likes: 0
From: Lost Wages, NV
Hey qman, I'd forgotten all about you doing the acetone experiment last year. Glad to see it's still working. Thanks for the update.
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Junior User
Joined: Aug 2005
Posts: 63
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From: Grand Rapids
You should still check the compression. I have a 360 engine that I was told had been rebuilt recently and was surpised when I check compression when I got it home. Two cylinders were around 45 PSI. Tear down of the engine revealed two bust compression rings. The guy apparently put new parts in the engine but did not bore the cylinders out to elliminate the ring grooves wore in the walls of the top of the cylinders. There are a lot of different ways some one can " rebuild " an engine. I will need to bore the block .050 over to elliminate the wear in the cylinder walls.
Just check the compression to make sure.
Just check the compression to make sure.
Thread Starter
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Mountain Pass
Joined: Mar 2006
Posts: 101
Likes: 1
From: Dayton
the guy that rebuilt mine actually had the main body of the block done by Wayne's. so the only stuff my friend did was put it back together. i did do a compression test on #7 and it was at 70 but we found the problem and is trying to fix it.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Originally Posted by northey87
would a cracked exhaust manifold be a reason for bad mpg's? yesterday when i was in the engine i noticed small craks in one of the exhaust manifolds.
Adding 4 barrels and cams in not the answer. IMHO
John
Cargo Master
Joined: Sep 2004
Posts: 2,691
Likes: 6
Originally Posted by northey87
what is acetone? never heard of it.