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Old 11-17-2007, 02:05 PM
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blower engine question

Hi this is bambaking and I am building my first blower engine. I have a few questions that might be rookie questions but here we go, I am building a 468 pontiac motor with a 871 and 2 750 cfm carbs, can I still run power brakes and a vacuum advance distributer? None of my hotrod buddies ever had a blower motor and I get conflicting answers even from blower company tech lines. Any help from someone who has gone thru this or is well versed in blowers is greatly appreciated.
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Old 11-17-2007, 03:20 PM
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Good information from F-Bird'88, but do you need to go with vacum advance? As far as timing goes, though I'm manual with a BTM, which I've never brought into play, I'm running 20 deg initial and about 34 to 36 total, and have it all in at 2800 rpm.That's on a 383, 8-71 and two Demon 750 BC/s.

Good luck with the project, keep us posted.
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Old 11-17-2007, 07:26 PM
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blower engine question

Well thanks for all the good info. My set up will be running 7 to 8 lbs of boost and really want driveability on the street rather than big horsepower because this set up is for show more than go. I will look into the boost retard and see what is recomended. Thanks to all that responded it was very helpful.
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Old 11-17-2007, 09:10 PM
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You won't be into boost at cruising speed. I made a 50 mile cruise recently and got 10.5 mpg, and of course no boost at steady throttle. You'll see small boost accelerating normally (if there is such a thing in a blower car..), my setup, 8.4 comp, underdriven 8-71, Lunati fairly radical full roller produces 8-9 lbs at WOT. I've never employed boost retard nor have I detonated this motor.

As far as vacum/mechanical timing, maybe most of us are 'lazy', but it's not worth it, to me anyway, to mess with the variables involved when electronics are available, cost aside, and are efficient. My opinion only.
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