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Author Topic:   bowtie or q-jet
racerdave99
Dirt Roller

Total posts: 14
posted January 05, 2003 10:31 PM
i was wondering, in my class we can run cast iron bow tie intakes or cast iron quadrajets. midwest motorsports has a q-jet that has been modified for better air flow and they said it works best with a 2 barrel carb. What would be better a bow tie or a q-jet? we run stock holley 500 with 2.02 valves on a quarter mile dirt track. what is better and what is the best carb adapter and where can i get one?
Thanks David
we also run headers

tilley88
Dirt Freak

Total posts: 353
posted January 06, 2003 05:49 AM
Bowtie, hands down. Put the two side by side and you'll see. The Bowtie is heavier, but the extra flow far outweighs the weight.

KPLugnut
Dirt Freak

Total posts: 408
posted January 06, 2003 08:31 AM
On a small quarter mile track, lap times may not be any different with a good quadrajet intake, especially a modified one with the right spacer, and a good carb.
The thing about the Bowtie is it has much more plenum area volume, which lends itself to the peak torque being much higher in the rpm range, at the sacrifice of off-the-corner torque on the low end, which, on a short track is where races are won.
Bigger is not always better when it comes to the really short tracks.
As for spacers, it all depends on what your rules allow. A professionally designed and built custom one will always be better than a generic one off the shelf, but the custom ones are not always legal.
Let us know what rules you have in that area, and we'd be glad to make a recommendation.

Hope that helps,
KPLugnut

rico 08
Dirt Freak

Total posts: 372
posted January 06, 2003 02:32 PM
lugnut is right i had a bowtie 355 and my buddy had a q-jet 355 and he would pull me off corners with identical long blocks really suprised me.

tilley88
Dirt Freak

Total posts: 353
posted January 06, 2003 02:50 PM
Sorry to disagree with both of you guys, but my experience proves otherwise on a 1/4 mile track with a 355. My Bowtie pulls harder and longer than my best Q'jet. Don't get me wrong, I like a good Q'jet intake, too. As KPLugnut said, carburetion means alot, too. I guess the heads would play a large part, too. Cam also. So many variables, so little time....

KPLugnut
Dirt Freak

Total posts: 408
posted January 06, 2003 03:23 PM
Exactly, Tilley. There are very many things that factor into it. In stock form there is no question the Bowtie will out-perform a stock Qjet intake, but in heavily modified form, a Qjet intake with the right spacer/adapter, and everything else, will beat a bowtie off the corners especially on a tight track where rpms drop a lot.

As always, there's a hundred ways to skin a cat, tho, and things can be done to make up for the loss of some bottom end from a large plenum volume.

KPLugnut

Eljojo
Dirt Freak

Total posts: 273
posted January 06, 2003 06:37 PM
I get around to several different tracks and run under several different sets of rules. One track allows the Bowtie, and laziness set in and I decided to run it at a track that mandated the 2101 Performer. The Car was very lazy off the corner! So I decide to swap the Bowtie for the 2101. Take it back to the first track and by the time I pass the flagstand, I'm out of motor! Like so many have said already-what works best at one track may not be what works best at another!

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