Whats the best route to go for dual carbs?

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Whats the best route to go for dual carbs? Empty Whats the best route to go for dual carbs?

Post  bronco911 on October 29th 2013, 6:42 pm

Running thru the Holley sizing calculator I get the 1250 is the largest made, so I should consider dual carbs screen. Is this where some of my power may be lost? scratch 
What is the best way to tackle this issue? 2 850's?
593 CI w/max 7500 rpm

Thanks
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Post  Lem Evans on October 29th 2013, 6:48 pm

QFT has 1450 QFX series carbs.

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Post  bronco911 on October 29th 2013, 7:08 pm

Lem Evans wrote:QFT has 1450 QFX series carbs.
Thanks Lem. Just went and looked at them.
How do you think they would hold up in the off-road/sand in everything environment? Have you heard any bad about them?
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Post  maverick on October 29th 2013, 7:19 pm

Those are great carbs. Just run a good filter.
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Post  bronco911 on October 29th 2013, 7:29 pm

Lem Evans wrote:QFT has 1450 QFX series carbs.
Will this bolt right on in place of my 1250 Holley? Reading the specs can't flat out find the answer, a little vague
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Post  richter69 on October 29th 2013, 7:40 pm

yes, unless you have a 4 hole spacer under the 1250 to match.
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Post  schmitty on October 29th 2013, 8:17 pm

I've been using a QFX 1450 on my mud drag 604" C head combo since it was built, and can say it is the real deal, and you wouldn't be dissappointed if you went that route.
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Post  bronco911 on October 29th 2013, 8:40 pm

schmitty wrote:I've been using a QFX 1450 on my mud drag 604" C head combo since it was built, and can say it is the real deal, and you wouldn't be dissappointed if you went that route.
Ignore all those questions I just asked Scmitty ( except the important one)

Thanks!
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Post  rmcomprandy on October 29th 2013, 10:13 pm

bronco911 wrote:
Lem Evans wrote:QFT has 1450 QFX series carbs.
Thanks Lem. Just went and looked at them.
How do you think they would hold up in the off-road/sand in everything environment? Have you heard any bad about them?
I was gonna say ...You should ask Schmitty here ... he has had one on his mud truck for the past 2 1/2 years but, he has already answered. Smile 

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Post  kim on October 30th 2013, 2:27 am

For the displacement and RPM that 1400 cfm is even small Two 1250's would work well.

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Post  fatal addiction on October 30th 2013, 8:10 am

What is the intended use of the motor?
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Post  bronco911 on October 30th 2013, 9:16 am

fatal addiction wrote:What is the intended use of the motor?
Trying to go 300' in 4.4ish seconds in a 4,200 lb Bronco. In sand. With up to 8 passengers. No bottle, NA gas.
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Post  J.Toney on October 30th 2013, 11:44 am

bronco911 wrote:
fatal addiction wrote:What is the intended use of the motor?
Trying to go 300' in 4.4ish seconds in a 4,200 lb Bronco. In sand. With up to 8 passengers. No bottle, NA gas.
Going from previous bests of 4.80's to 4.40's, with no wieght changes? Gonna take more than a tunnel ram I'd bet. Time for the fast gas, or push air in it. I went from 5.80's to 5.1's with 160hp/100# NA power gain. But that was slow, easy to improve. The faster you go, the more work it takes to gain. I wonder what sort of power you'd be needing, 1100-1300? Similar vehicles (weight wise) seem to need that sort of power for what your wanting. Maybe those A-heads are something for you to think about.
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