Experts: Runner length and volume?
#21
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Tomcat,
This may help also....some of us hang out on this site www.speedtalk.com There is always good hard core facts on this site from some of the best in the industry. Don Terrell is an ex-cup guy and knows alot of people.
Chris
This may help also....some of us hang out on this site www.speedtalk.com There is always good hard core facts on this site from some of the best in the industry. Don Terrell is an ex-cup guy and knows alot of people.
Chris
#22
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Chris,
Do you guys make custom intake manifolds? If so I would be interested in hearing your opinion about what gains could be expected on my motor with a custom designed manifold. I know it won't be cheap, but what is with this sport?
Craig
Do you guys make custom intake manifolds? If so I would be interested in hearing your opinion about what gains could be expected on my motor with a custom designed manifold. I know it won't be cheap, but what is with this sport?
Craig
#25
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Originally Posted by kennywould
Thanks Artic, Raylar I appreciate that. We thought that the design of the stock plenum and the height of the intake into the plenum wasn't very impressive! There was plenty of talk in one of the boat mags about cutting the tops off the intake 1/2" to set them level in the plenum, but it seemed that the problem with that, the flat tops on the runners and the size of the stock throttle bodies weren't cutting it! It's not easy to see on that pic but I cut down the dividers just past the intake bolts, about 5" and opened up the tops which I guess you still have 12" runners in the manifold alone but the top 5" is siamesed and I think they really help feed each other. I removed as much of the metal I could inside the bottom 7" of the runners, opened those up nicely. I never flowed the intake but I can tell you it made a heck of a difference! The plenum was a design as you go, I took some criticism from some about it but there again it seems to work well! I don't know for sure but I think there is a dyno sheet laying around here somewhere, see if I can dig up some numbers.
Last edited by GPM; 08-05-2007 at 04:42 PM.
#27
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GPM,
What are the particulars on that motor? I am assuming that is the motor with the modified intake manifold. Is he running a stock oil pump? We run a stock low volume oil pump on our 468" in our 66 Vette and that is about where the oil pressure is with 10W30 Mobil 1.
Craig
What are the particulars on that motor? I am assuming that is the motor with the modified intake manifold. Is he running a stock oil pump? We run a stock low volume oil pump on our 468" in our 66 Vette and that is about where the oil pressure is with 10W30 Mobil 1.
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Craig
#29
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Originally Posted by GPM
Found this laying around, don't know if you will be able to read it.
GPM,does the fast controller come with a base program that you tweak with laptop on the dyno at different settings and pulls or do you have to start at square one and create a program and make 100's of trial and error pulls on the dyno? Are you running somekind of exhaust sensor that modifys fuel curve (o2 wide band or something). I'm gunshy of getting a different fuel injection and trying to get program right while test driving boat under boost on water(one lean run and its all over!). Obviously you must have to start out fat and sloowly lean it down until its still making safe power,ive kind of done this already with factory fuel injection on my boat with blown 540 by slowly stepping up base timing and adjusting boost referenced fuel presure.Do you run a flat given fuel presure and make adjustments to your pulse width with your set-up or are you raising fuel presure with boost? I hate the boost refernced set-up on my boat,it's too rich at part throttle boost and i'm definately going to run bigger injectors in whatever fuel injection i run next year and use the two bar map sensor to tell computer to adjust fuel curve,i'm currently doing both and its NOT precise. Thanks for any info,I haven't been able to get any exact answers from the "fuel injection experts" other than multiple reprograms of my controller,Smitty
#30
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Originally Posted by WETTE VETTE
GPM,
What are the particulars on that motor? I am assuming that is the motor with the modified intake manifold. Is he running a stock oil pump? We run a stock low volume oil pump on our 468" in our 66 Vette and that is about where the oil pressure is with 10W30 Mobil 1.
Craig
What are the particulars on that motor? I am assuming that is the motor with the modified intake manifold. Is he running a stock oil pump? We run a stock low volume oil pump on our 468" in our 66 Vette and that is about where the oil pressure is with 10W30 Mobil 1.
![Drink](/forums/images/smilies/drink.gif)
Craig
Motor 564 cu, hand ported bb2 xtra heads, 300/308solid roller, 9:1, stroker crank, home grown intake & plenum. I think after several pulls with no oil cooler, the oil pressure is going to drop, usually running straight 40w
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