Super Victor vs RPM Airgap Dyno results SBC

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Re: Super Victor vs RPM Airgap Dyno results SBC

Post by mike walsh »

90 jets, I gotta get a big block!
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Re: Super Victor vs RPM Airgap Dyno results SBC

Post by Winston Wolf »

Here are the track results:

Last year, dual plane with 1" open spacer:

60 1.662 1.677 1.682
330 4.822 4.833 4.849
1/8 7.502 7.531 7.547
MPH 91.93 91.19 91.06
1000 9.788 9.855 9.853
1/4 11.723 11.806 11.797
MPH 115.51 115.25 115.83

AVE ET 11.775
AVE MPH 115.53

60 1.678 1.694 1.704
330 4.827 4.855 4.865
1/8 7.488 7.518 7.532
MPH 92.53 92.53 92.33
1000 9.764 9.799 9.815
1/4 11.688 11.724 11.740
MPH 116.92 117.00 117.01

AVE ET 11.717
AVE MPH 116.97

Now before everyone starts screaming about the results, there were a few things that need to be addressed, so I still need to do a bit more testing before I make a final decision.

We had a rainout on Saturday, so I didn't get to do any tuning. Just a few runs on Sunday, then right to eliminations. I had my LM2 hooked up to read the A/F ratios and shift points. I kept all the shift points around 6500-6600 to keep the results controlled. With the single plane, the carb is leaning out on the top end. After around 6000 RPMs, the A/F ratio starts to climb from 12.5-12.8:1 up to 13.5/13.8:1 by the time it crosses the stripe at 6700 ish. It is safe to assume this is affecting my results somewhat. I would guess I need to run a smaller airbleed to flatten it out? I would also like to try the same 1" spacer on top of this Super Victor.

Any differences in the short times might not be all in the intake, I put in some Strange Dual Adjustable rear shocks, and I don't seem to know how to set them yet...
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Re: Super Victor vs RPM Airgap Dyno results SBC

Post by ap72 »

The only advantage I have ever found in a dual plane intake is in packaging. It fits a longer runner underneath the hood. If you can modify a single plane or tunnel ram intake to give you the proper runner length though there is NO REASON TO RUN A DUAL PLANE. Sure it'll lead to a hole in the hood, but that's why dual planes were created- to keep the carb under the hood, and that is it as far as i can tell.
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Re: Super Victor vs RPM Airgap Dyno results SBC

Post by Troy Patterson »

Troy Patterson wrote:What you guys aren't considering since it's not been mentioned is that a proper designed carb and fuel curve will allow the single plane to overtake the dual plane in power made at a lower rpm and more from there on up.

An optimized carb design and fuel curve for a dual plane isn't likely going to be optimal for the single plane - if you are maximizing each. The single plane would win the race every time and not loose enough to both with on the low end. Add port divider extensions and good porting and you've got your cake and you can eat it too.

Troy Patterson blog tmpcarbs.blogspot website TMPCarbs.net Engine Professionals Magazine's TMP Tuning article, pg. 44
If you are still running the 950 HP, you're shootin' yersef in the fut.

Troy Patterson blog tmpcarbs.blogspot website TMPCarbs.net Engine Professionals Magazine's TMP Tuning article, pg. 44
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Re: Super Victor vs RPM Airgap Dyno results SBC

Post by rally »

Well Winston the dual plane looks superior in your results, not surprised. For your RPM range the Air Gap is the better choice, never underestimate a good high rise dual plane, technology has changed and come a long ways.
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Re: Super Victor vs RPM Airgap Dyno results SBC

Post by 67RS502 »

rally wrote:Well Winston the dual plane looks superior in your results, not surprised.
youre so bias that you dont wanna see the truth... #s dont lie, .5 tenth & 1.5mph better is an improvement, so hows the dual plane better?
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Re: Super Victor vs RPM Airgap Dyno results SBC

Post by Ken_Parkman »

rally wrote:Well Winston the dual plane looks superior in your results, not surprised. For your RPM range the Air Gap is the better choice, never underestimate a good high rise dual plane, technology has changed and come a long ways.
Your kidding - right?
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Re: Super Victor vs RPM Airgap Dyno results SBC

Post by Troy Patterson »

Not to sound like I am picking on anyone, but I dyno'd a carb of mine against an engine builder's built carb and made like 25 lbs. more torque and took the dyno load 1100 rpm lower. The dude was Burbank Speed and Marine in Burbank, CA. The engine builder told our mutual customer that the gain was small and not worth anything extra ($). #-o

Troy Patterson blog tmpcarbs.blogspot website TMPCarbs.net Engine Professionals Magazine's TMP Tuning article, pg. 44
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Re: Super Victor vs RPM Airgap Dyno results SBC

Post by Winston Wolf »

Like I said, don't start screaming yet......

I had a very nice flat a/f curve with the Airgap. I have it going too lean over 6k with this Super Victor. Give me a chance to change my air bleeds and flatten it out to where it should be. I am betting I will pick up more yet.

I dont see where one can say the dual plane is superior yet, the single does run a bit quicker and mph's higher.

I can post the fuel curve if anybody wants to see it....
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Re: Super Victor vs RPM Airgap Dyno results SBC

Post by Troy Patterson »

Post the fuel curve and I might suggest it may be faster with more jet as opposed to a smaller high speed air bleed. You can only know for sure if you try it - don't rely on what you think the numbers should be as your engine combo might just want something different.

Troy Patterson blog tmpcarbs.blogspot website TMPCarbs.net Engine Professionals Magazine's TMP Tuning article, pg. 44
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Re: Super Victor vs RPM Airgap Dyno results SBC

Post by Winston Wolf »

Alright Troy. The top one is my first run of the day. Started with 77 pri jet and 86 sec jet. The rest of the runs I went up one size on front and back, 78 pri and 87 sec. You can see that the last run of the day, it was running really lean at the top.... I would be interested in your thoughts.

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Re: Super Victor vs RPM Airgap Dyno results SBC

Post by MadBill »

Looks more like fuel starvation... :(
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Re: Super Victor vs RPM Airgap Dyno results SBC

Post by Winston Wolf »

MadBill wrote:Looks more like fuel starvation... :(
That had crossed my mind too, but it seems to lean hook up in each gear. I would assume it would only starve after 1st and 2nd. I am running a Carter 120 GPH mechanical fuel pump, which should be large enough to feed this little engine..?
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Re: Super Victor vs RPM Airgap Dyno results SBC

Post by Matt Gruber »

tape a gauge to the windshield for a test. T before carb inlet. can't assume anything.
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say again the best 1/4 et and mph for single and dual. too many pages to go thru, thanks!
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Re: Super Victor vs RPM Airgap Dyno results SBC

Post by CamKing »

Gee.
The single plane was quicker and faster in the 1/8 and the 1/4, and not even tuned yet.
Who woulda thunk it #-o
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