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new motor

Post  bluecoupe on April 17th 2012, 12:29 pm

looking to build a new motor. its for a class your are lemited on ci to 525 and a 4150 carb and a plate nos system and run on a 275/60/15 drag radial.what would be the best way to do a 525 big bore and short stroke or long stroke small bore.i have a set of p51 heads and the new trick flow 4500 intake going to run a spacer for the carb the car has to way 3300# and has a jet lemit on the nos system also needs to run 5.30 to 5.50 thank you for the help

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Re: new motor

Post  Barney on April 17th 2012, 12:36 pm

Big bore for sure. What is the limit on the NOS jet? You could do a 4.625 bore, 3.85 stroke deal and it would be 517 inches and would make a ton of power up top, and the nitrous would supplement any torque loss on the bottom. Given the limited tire I think this would be a good option for you. I figure it will take 1150-1200hp to et at that weight. Get yourself a 7531 with a power grid and you should be in business.
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Re: new motor

Post  bluecoupe on April 17th 2012, 7:42 pm

the jet comes out to be like 210 i forgot the # sorry i can not use the 7531 or pwer grid limited to just a dig 6 and no digets or nos controllers

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Re: new motor

Post  richter69 on April 17th 2012, 7:46 pm

any rules on plate type? amount of spray bars? solenoid? line sizes etc?


There are also a lot of little things a guy can do with the rest of the car to make it faster also............



This sounds a lot like a similar class we have around these parts.
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Re: new motor

Post  Barney on April 17th 2012, 8:34 pm

bluecoupe wrote:the jet comes out to be like 210 i forgot the # sorry i can not use the 7531 or pwer grid limited to just a dig 6 and no digets or nos controllers
A 210 is huge ... A 110 is like 350 so if that is indeed the rule then your good. Can you use a cross hair plate? Your suspension will be key. Hit up Yellowhorse on here, he's real good with the small tire stuff.
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Re: new motor

Post  BOSS 429 on April 17th 2012, 10:07 pm

bluecoupe wrote:looking to build a new motor. its for a class your are lemited on ci to 525 and a 4150 carb and a plate nos system and run on a 275/60/15 drag radial.what would be the best way to do a 525 big bore and short stroke or long stroke small bore.i have a set of p51 heads and the new trick flow 4500 intake going to run a spacer for the carb the car has to way 3300# and has a jet lemit on the nos system also needs to run 5.30 to 5.50 thank you for the help


is there a rule on which deck height,block,or head you have to run? spacers under the carb sometimes cost power
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Re: new motor

Post  bluecoupe on April 18th 2012, 4:29 pm

its 210hp sorry.deck has to be stock and stock bore space has to be 1 nos and 1 fuel solenoid and no cross plate.

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Re: new motor

Post  Barney on April 18th 2012, 7:29 pm

So a .080 jet then or there abouts. The above combo would work fine as long as you get it to hook, might be a touch easier with A heads, but if you have P51 heads I certainly would keep them. It's gonna be a big compression deal too, and the Q if it's allowed. Big shot, or Steve Johnson plate, probly the latter.
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