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Normally when we talk 500 2 Barrel Rules you see 355 and 383 that short of combo. I know you don't traditionally have a big runner like 200cc is the most before you don't perform as well. When you go to a bigger motor say a 427 ci like I have does that rule change? Edelbrock 2925 intake no spacer, roller cam, 200cc Dart Heads minimal work just blending from what I understand and a 500cfm with 1 3/4 Plates. Dynoing at 565HP at 6,000rpm and about same torque but 4500. 8" Mod Tire. We just got a repave so I might need more power. Just want to learn more about motors. Does the stuff for the small CI we see more common apply with this 2 barrell or does the bigger CI change the game?
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from my experience , when running a 500 cfm 2brl on any cubic inch , the more compression the better , kinda like a restrictor plate engine , if your rules allow and you cant run domes , angle milling the heads helps tremendously ...... -
Only Rules we have are. Steel Head, Steel Block. 500 Holley with 1 3/4 Plates that's it! I think I'm around 14 or 14.5 to 1 motor from what I was told by the builder. He hasn't done as many 2 barrell so we went conservative in some areas on head work. The Heads are Angle Milled. Flat top Pistons. T and D Shaft Rockers, Roller Cam and Lifters I do have the Cam Card just not on me at the Moment
Originally posted by fastford View PostComment
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A big cube engine will run out of breath at the end of the straights with a 500... worse with a 350! Just my opinion... your mileage will vary.Member of the Luxemburg Speedway Hall of Fame
Class of 2019Comment
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thats why you need all that compression , because you can not turn it very much....Comment
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All depends on the carb. Seen 500 cfm 2 barrels and seen 780 cfm 2 barrels......Comment
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Mines closer to the latter. Ran the car its been running quite well out the gate. Until it got taken out for the lead I'm in the process rebuilding it. I actually have WAY to much motor for this track they didn't do the repave like we thought. I'm actually trying to find ways to kill the power by as much as 80-100. I run an Edelbrock 2925 with a Super Sucker on it and a Holley 500 With no spacer. I can light the tires up anytime I want and while I have throttle control and know I can only use about 12 throttle for consistency reasons trying to find a way to restrict it without making the air flow turbulent. I've already knocked as much timing as I can safely knock out. Can I run a 4 barrel adjustable spacer to restrict it then put my super sucker adapter then carb on top? Or will having the 4 hole restriction be too turbulent
Originally posted by hpontap View PostComment
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I guess you could put a 390 carb on it. People think that a carb will go lean when it gets maxed out but it doesn't. They go dead rich.Comment
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can't put a throttle stop on it?Comment
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We have to run a Holley 500, I have a throttle stop on it. I can hold it at half throttle and not spin tires i have good throttle control it’s just easier if you can kill it and use WOT much easier to be consistent would 4 barrel restrictor on top of the open plenum then my 4 to 2 HVH super sucker with carb on top be a bad idea?
Originally posted by powerslide View PostComment
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Don't know what stacking plates would do to the distribution. You could try it by hot-lapping a couple of laps and do a plug check to verify that no cylinders are running lean.Comment
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I ran 436 ci engines with a 350cfm carb and 500cfm at another sanctioning body. Worked great I had success in texas, minnesota, alabama, kansas, iowa and nebraska. The smaller the carb the bigger the cube was what we all did around here for years.
If you have too much motor change the cam its not rocket science, go to a wider lobe separation to smooth out the power, oval track cams hit hard in a small area... others with wider lc dont.Comment
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That's what Im fighting it makes gobs of torque at 4500cfm. They won't let me run a 350cfm I tried. Its Nascar sanctioned and they said they rules say 500cfm 4412. It also has oversided throttle plates but the rules allow it. I want something I can knock down for the small track then when I go to the 1/2 mile high bank crank it back up. I'll post some cam specs see what you think I should go to I honestly didn't think of cam because what I have will work at the bigger track.
Originally posted by stock car driver View PostComment
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This is what I’m working with and it was installed 3 degrees retarded
Originally posted by stock car driver View PostComment
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Could not open the attachment for some reason. but Honestly, I have never heard of rules saying that you have to run more carb. Its usually how much restriction they put on the induction system to even the field. That's just crazy.
Regardless, you can put an out of the box 500cfm 4412 on it or a more restrictive intake. If you have a nice carb you are running now, you could lose about 20ftlbs and 15-20hp by going that route alone and the intake might take away another 10hp and 15ftlbs of torque if you have a " good one " on it now.
All else being said, having too much power is one of the best problems you can have unless the power is like a light switch ( either on or off ).Comment
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