General Category > Quadrajet Carb Talk and Tips

Loses 30 hp with air cleaner?

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77cruiser:
Have a 421 sbc on the dyno & when I put a Moroso drop base air cleaner assembly on it we lost over 30 hp.
What is the proper shaped base for a Qjet?
Here are 2 pulls lost 25 hp with ac.
When I put in a richer rod it loses more with the ac assembly. But the sensor is showing it going leaner with the ac on.

http://myweb.midco.net/77cruiser/Dyno%20CV%20rod.jpg
http://myweb.midco.net/77cruiser/CV%20rod%20B%20hanger.jpg

73ss:
That's odd. Looks like the right side is leaning out a lot more then the left side. did you have a air filter in the cleaner? turbulence?

77cruiser:
Had a filter in It was a Moroso drop base deal, 14 x4. Act weird with a screen top velocity stack on it too.

Cliff Ruggles:
Drop base air cleaners move the lid closer to the carb.  Try a taller air cleaner element in it and see if it helps....Cliff

77cruiser:
When i went back last week we tried everything we had available. 25 hp down over no ac.
Pics of a couple of ac we tried. they had 4 inch filter installed. Really hurt when I got beat by the Holley, not really but if I could match the no ac power with one on it would be nice.
I don't know how much power is lost but the AFR varied quite a bit side to side with the Q but not the Holley.

http://myweb.midco.net/77cruiser/100_3908.JPG
http://myweb.midco.net/77cruiser/100_3909.JPG
http://myweb.midco.net/77cruiser/Best%20Chuck%20Nyuten.jpg
http://myweb.midco.net/77cruiser/Best%20Qjet%20no%20AC.jpg
http://myweb.midco.net/77cruiser/Best%20Qjet%20w%20AC.jpg

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