Turbo Q-jet vacuum question

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Turbo Q-jet vacuum question

Postby chuck79 » Sun Mar 13, 2016 9:33 pm

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I've got a Q-jet off a '79 Turbo Regal for my 4.1. I have to hook up a vacuum like to the port right under the fuel inlet. Does anyone know if it's a ported or manifold vacuum?
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Re: Turbo Q-jet vacuum question

Postby crawfw » Mon Mar 14, 2016 11:18 am

If its under the throttle butterflies, it should be manifold vacuum. If there is vacuum present at idle, it is manifold vacuum.
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Re: Turbo Q-jet vacuum question

Postby chuck79 » Mon Mar 14, 2016 7:00 pm

The guy I bought the carb from stated that the port in question had to be hooked up to a external vacuum source. The vacuum does not come internally through the carb. Otherwise it won't run right. Something to do with a power valve that requires vacuum. It's been a while.
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Re: Turbo Q-jet vacuum question

Postby Monza Harry » Tue Mar 15, 2016 9:32 am

Chuck that sounds right, but I would go to a Turbo Buick site and post there. I know that draw through carbs have power valve issues, do to constant vacuum from the blower/turbo. That is one of the many reasons for failed home turbo swaps. The gang on the blown/turbo car forums have had to deal with this and know much more than I on the subject, as soon as I win the lottery I will commence a learnin' 'cause I WANT a blower! Harry
I'm not a hoarder I'm a preservationist 78 Monza Spyder (Soon To Be 2+2 with Spoilers)
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Re: Turbo Q-jet vacuum question

Postby chuck79 » Sat Mar 19, 2016 5:51 pm

Thanks Harry.
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Re: Turbo Q-jet vacuum question

Postby chuck79 » Sun Mar 27, 2016 9:41 pm

http://www.78ta.com/HTAF/index.php?topic=9215.0
The port in question is for the pevr valve, clears up a lot of info for me. Seems I put a pevr valve into the manifold, run the lines to connect it and I'm golden. Any other thoughts?
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Re: Turbo Q-jet vacuum question

Postby chuck79 » Sat Apr 02, 2016 8:55 pm

I've put the carb for sale in the for sale section if anyone is interested. It looks as if the pevr valve is an unobtanium 1 yr. only part unless someone else knows different. This is a good carb. I would hate for it to be wasted. I've purchased a '79 Corvette q-jet off ebay. Change the jets and adjust the secondary for less airflow should do it after a good rebuild.
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