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  #16 (permalink)  
Old 10-28-2008, 05:49 PM
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which is exactly why I selected a cam for you with a wide LSA and a single pattern- It'll get chocked on the top end but it is perfect for low end and killer mid range torque.
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  #17 (permalink)  
Old 10-28-2008, 07:56 PM
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C3B & C3BX Intakes

C3B & C3BX Intakes
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  #18 (permalink)  
Old 10-30-2008, 01:20 AM
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"Qjets were put in a very rare few marine applications, so finding a marine Qjet isn't easy"

Summit have a few Q Jet marine applications.
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  #19 (permalink)  
Old 10-30-2008, 09:11 AM
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Like I said... Finding marine Qjets is EASY
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Old 10-30-2008, 10:21 AM
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Good advice!

People have given you really good advice. Torque increases when velocity increases, hence the vortec heads. Your combo would like a 1-inch 4-hole carb spacer from Summit or Jeg's. Also don't neglect the timing. You may be surprised what even 2 more degrees of advance will do for it!
Pat
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  #21 (permalink)  
Old 10-30-2008, 11:29 AM
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Not the four holer, get an open one incher.
My motor really came to life after I switched.
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  #22 (permalink)  
Old 10-30-2008, 11:40 AM
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Could be!

I was assuming that the manifold plenum had 4-holes and not an open plenum. A 4-hole manifold works much better with a 4-hole spacer. If you used an open on a 4-hole manifold and it picked up, that tells you that the design of the manifold had a serious distribution problem. The open area under the carb allowed a space for the sharing of mixture that helped to overcome the problem. Good call!
Pat
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  #23 (permalink)  
Old 10-30-2008, 12:00 PM
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Check out this manifold shootout video, it shows cutting the plenum divider or adding one inch open spacer results.
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  #24 (permalink)  
Old 10-30-2008, 12:39 PM
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Nice

Thanks, Malc. I appreciate good info!~
Pat
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Old 10-30-2008, 01:52 PM
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I would use a stock q-jet intake and a q-jet. The stock intake will make more power up to 3500 rpms over the performer intake.

I would also use a compcam 240H (192/200, 108 lsa). This will make a huge torque improvement over the stock cam. The narrow LSA will really help in low rpm torque.

http://www.compcams.com/technical/Ca...67_226-227.pdf
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  #26 (permalink)  
Old 10-30-2008, 01:56 PM
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Quote:
Originally Posted by 454C10
I would use a stock q-jet intake and a q-jet. The stock intake will make more power up to 3500 rpms over the performer intake.

I would also use a compcam 240H (192/200, 108 lsa). This will make a huge torque improvement over the stock cam. The narrow LSA will really help in low rpm torque.

http://www.compcams.com/technical/Ca...67_226-227.pdf
108 LSA is a huge no-no in an I/O, even with that small duration. It doesn't take much intake reversion to suck water back in. Even if it doesn't hydrolock, have you ever seen what happens to an 1800-degree exhaust valve when water hits it
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  #27 (permalink)  
Old 10-30-2008, 02:20 PM
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malc,
the video is a bit mis-leading for this thread because they are measuring HP and TQ dyno results starting at about 3,000rpms with a "matched parts" combo....
(where there is plenty of piston speed to make power)

on this thread, if he still had the smaller runners stock 2V true dual plane intake on it, a 2 hole spacer "might" have helped it wind up a tiny bit quicker at very low rpms (1,000 to 3500)....
oems did use spacers to help on heavy car/small motor combo's for more acceleration TQ "pep".....

add a spacer to the new intake won't help/ will likely hurt at low rpms due to even more cubic area to dilute the Hg signal....
his "crosswinds" intake does have the wall removed already so it is trying to pull a vacuum from the entire intake area.....


dang it!
I wish he had said what the 246 cam idle Hg was before and after removing the center wall on the RPM....
that's what most folks fight with when using the air gap.....

Last edited by red65mustang; 10-30-2008 at 02:28 PM.
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  #28 (permalink)  
Old 10-30-2008, 02:26 PM
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So since I have the Plenum Divider already cut on the Intake that I have, should I keep this on there? This was what I was thinking was hurting the Torque, compared to the Performer, but I guess not after watching that Video.

Bryan
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  #29 (permalink)  
Old 10-30-2008, 02:39 PM
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byr,
my $.02
yes, the crosswinds has to go.....

the missing divider at low rpms means it behaves like a open plenum intake...
the slow moving piston is trying to pull a vacuum over the entire manifold and all 4 venturis instead of only 1/2 the manifold and 2 venturis at WOT per piston intake stroke to get the best cylinder fill to make power so it will wind up faster up....
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  #30 (permalink)  
Old 10-30-2008, 02:45 PM
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Ok,
Gotcha, now what about blocking this off, since I already have the manifold, is that possible?

Bryan
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