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Old 05-30-2012, 12:49 PM   #41
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Re: 1994 RUST FREE blue bird All American RE

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Everyone is an expert on a forum. Thank God they are not running the country! The 8.3 is the bomb. You should have kept that one. Mine got 10.5 mpg on a 1200 mile trip. That included hills and going over the grapevine. The 643 locks up in third and forth. I was cruising at 65 mph with a rpm of 1650. Some of these other guys are doing 55 at 3000 rpm getting 6mpg. Whoever got your bus will NEVER regret it.
How did you manage 1650rpm? Do you know what your rear end gears were??
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Old 05-30-2012, 01:31 PM   #42
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Re: 1994 RUST FREE blue bird All American RE

4.10 rearend ratio.
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Old 05-30-2012, 02:13 PM   #43
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Re: 1994 RUST FREE blue bird All American RE

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4.10 rearend ratio.
Interesting. I have 4:10 and am at 2000rpm at 62mph, with a 643 as well.
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Old 05-30-2012, 03:33 PM   #44
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Re: 1994 RUST FREE blue bird All American RE

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Originally Posted by opus
Quote:
Originally Posted by crazycal
4.10 rearend ratio.
Interesting. I have 4:10 and am at 2000rpm at 62mph, with a 643 as well.
My bus is in storage and not licensed right now. The only thing that would make a difference is tire size or an error in my tach or speedo. I've put about 2000 miles on the bus and a was staring at all the guages. Mine is a 1989 BBAA with an 8.3 and 643.
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Old 05-30-2012, 04:13 PM   #45
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Re: 1994 RUST FREE blue bird All American RE

mine is 2600 @ 72 mph.. top speed... 12x22.5 tires.
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Old 05-30-2012, 05:06 PM   #46
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Re: 1994 RUST FREE blue bird All American RE

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mine is 2600 @ 72 mph.. top speed... 12x22.5 tires.
I have 11-22.5 Mine will do pretty near 80 I think....havent tried anything about 70 though. I'm gunna call foul on your tach or speedo. Even with a different size tire I dont think you could get that low of an RPM. I get 9mpg, but I live in the mountains. 1800 is the peak torque curve for this engine. If I could get 1800rpm at 62mph [which is all I run], I would be well pleased.
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Old 05-30-2012, 07:14 PM   #47
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Re: 1994 RUST FREE blue bird All American RE

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Originally Posted by opus
Quote:
Originally Posted by chev49
mine is 2600 @ 72 mph.. top speed... 12x22.5 tires.
I have 11-22.5 Mine will do pretty near 80 I think....havent tried anything about 70 though. I'm gunna call foul on your tach or speedo. Even with a different size tire I dont think you could get that low of an RPM. I get 9mpg, but I live in the mountains. 1800 is the peak torque curve for this engine. If I could get 1800rpm at 62mph [which is all I run], I would be well pleased.

Call foul. Nothing I can do to disprove it right now. The bus is staying in storage for the time being. When it comes out, we can address the mattr again.
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Old 05-30-2012, 07:21 PM   #48
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Re: 1994 RUST FREE blue bird All American RE

Not trying to prove you wrong, just wanting to see why the differences. Do you know what size tires you have?
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Old 05-30-2012, 08:26 PM   #49
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Re: 1994 RUST FREE blue bird All American RE

I haven't looked at the tires in years. Next time I get out there I will look.
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Old 05-30-2012, 09:55 PM   #50
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Re: 1994 RUST FREE blue bird All American RE

The only time I looked at my tires in tears was when I bought them. ;)
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