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Plenum volume
https://slantsix.org/forum/viewtopic.php?t=64307		 Page 1 of 1
Author:  bigc4406 [ Sat Dec 14, 2019 8:03 am ]
Post subject:  Plenum volume
Do carb spacers work on a slant? I see that aussie makes a whole bunch of different intake manifolds looking for an intake for drag racing
Author:  Rick Covalt [ Sat Dec 14, 2019 12:33 pm ]
Post subject:  Re: Plenum volume
For drag racing and a 4 barrel you will do best looking for a Clifford manifold.
Author:  Dart270 [ Sat Dec 14, 2019 2:44 pm ]
Post subject:  Re: Plenum volume
The Clifford 4 bbl intake has the biggest runner cross sections and has been proved at the drags. Aussiespeeds will work, but they gave up top end in all of my testing on their long and short runner intakes. Too bad they have not increased runner area as otherwise the intakes are very nice.

Lou
Author:  slantzilla [ Sat Dec 14, 2019 3:00 pm ]
Post subject:  Re: Plenum volume
I have seen gains with a 1" spacer on mine.
Author:  drgonzo [ Sat Dec 14, 2019 5:18 pm ]
Post subject:  Re: Plenum volume
Quote:
I have seen gains with a 1" spacer on mine.
Open or 4 hole? :?:
Author:  slantzilla [ Sat Dec 14, 2019 8:50 pm ]
Post subject:  Re: Plenum volume
Open.
Author:  hyper_pak [ Mon Dec 16, 2019 2:32 pm ]
Post subject:  Re: Plenum volume
I think the factory Hyper Pak would have the largest plenum.

What do you folks think is the reason not any N.A. "Quick" drag cars don't use it?
Too hard and costly to purchase?
And by quick I mean 11s or faster.
And I am not picking on any slant racer or their times, I know how hard it is to go fast with a slant.
Please correct me if I am incorrect on this subject.
I don't know if I have seen one in the 11's with an Hyper Pak or a Doug Dutra recast manifold.

The Hyper Pak was not designed as a Drag Race manifold.
Author:  slantzilla [ Mon Dec 16, 2019 4:06 pm ]
Post subject:  Re: Plenum volume
Mike Jeffrey told me he and Blaine tried one on a 235 ci motor and it just plain was done making power at 5500.
Author:  Greg Ondayko [ Mon Dec 16, 2019 4:56 pm ]
Post subject:  Re: Plenum volume
Hyperpaks have tremendous torque in the 1800-3800rpm range but fall off immensely after that.

4 barrels on a slant in reality of performance are just sort of goofy. The air has to turn 90* before entering the intake tract.

Itb's or webber carbs on a short runner no plenum intake are prolly best for top end.

Will be interesting to see what the 8bbl muller/hogan intake does/ performs.

Lou also has an interesting intake from Mike that i would like to see some dyno time / testing on. If i remember correct its a pretty big plenum.


Greg
Author:  bigc4406 [ Tue Dec 17, 2019 12:32 pm ]
Post subject:  Re: Plenum volume
Thanks for the responses I just picked up an offenhauser I hope it will work for what I'm doing.
Glad to hear a spacer worked. I figured it would
Author:  Joshie225 [ Tue Dec 17, 2019 12:37 pm ]
Post subject:  Re: Plenum volume
The Offy is a good street intake with its smaller cross section runners and the heat box which accommodates a stock exhaust manifold.
Author:  Reed [ Tue Dec 17, 2019 2:43 pm ]
Post subject:  Re: Plenum volume
Quote:
Hyperpaks have tremendous torque in the 1800-3800rpm range but fall off immensely after that.
This is why I want to try one on my 76 D100 once I convert it to port fuel injection. My truck never sees the high sinde of 3600 RPM, even though it has 3.9 rear gears.
Author:  Greg Ondayko [ Tue Dec 17, 2019 2:53 pm ]
Post subject:  Re: Plenum volume
My 69 dart has 3.23 gears now and its a blast on the twistys and autocross with the big cam.


Greg
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