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Old 08-09-2014, 09:30 PM   #11
Bus Geek
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Join Date: Mar 2011
Location: Houston, Texas
Posts: 7,113
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
Re: 68 Bluebird Conversion

I'm putting a little 4BT in my shorty. 130 hp and 327 pounds of torque. The new rear axle is a Dana 80HD with 4.30 gearing and the trans is a new Allison 6 speed with double OD. Final drive is .65 and the new tires will be 33.6 inches. That all works out to 1817 rpm @65. I was hoping to get closer to 1700 rpm (peak torque) but they don't make tires these days quite as tall for 6" rims. I'm shooting for mpg near the 30 mark but will be happy at 25-28.

The original 6 cylinder gas engine was 90 hp and about 190 pounds of torque hooked to a 1 to 1, 4 speed trans and a 6.17 rear end with 36 inch tires. It was only good for about 45mph at about 2800 rpm. Course you have to remember...this bus was built before there was even such a thing as the National Highway System.
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