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Re: Cylinder Heads and Horsepower
[Re: JD Dart]
#550876
12/12/09 02:42 PM
12/12/09 02:42 PM
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Joined: Jan 2003
Posts: 19,404
Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,404
Las Vegas
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Ok I will play along. Intersted to see what you get from the Moroso slide rule as we have dynoed the motor. Here you go. B1MC with oval ports done by Mike Duke Racing
444.1@ .700"
450.0@ .800"
457.2@ .900"
2910lbs
168.8mph
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Cylinder Heads and Horsepower
[Re: Al_Alguire]
#550877
12/12/09 02:48 PM
12/12/09 02:48 PM
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Joined: Nov 2007
Posts: 778
Sherwood park, Alberta.
go green
super stock
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super stock
Joined: Nov 2007
Posts: 778
Sherwood park, Alberta.
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Quote:
Ok I will play along. Intersted to see what you get from the Moroso slide rule as we have dynoed the motor. Here you go. B1MC with oval ports done by Mike Duke Racing
444.1@ .700"
450.0@ .800"
457.2@ .900"
2910lbs
168.8mph
Your HP computed from your vehicle MPH is 887.05 rear wheel HP and 985.62 flywheel HP.
how did Wallace racing calculators do ?
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Re: Cylinder Heads and Horsepower
[Re: go green]
#550880
12/12/09 02:54 PM
12/12/09 02:54 PM
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Joined: Jan 2003
Posts: 19,404
Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,404
Las Vegas
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When I punch the number into the Wallace calculator using Weight and MPH it spits out some ridiculous number like 1146hp. I dont put alot of faith in their numbers...The engine dynoed at 1050 at Pettis' place. We all know how dyno and flow bench numbers go though. Also as Greg points out DA does have a big afect on MPH and ET numbers. FWIW when we went 168+ the DA was 1586'
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Cylinder Heads and Horsepower
[Re: gregsdart]
#550883
12/12/09 04:22 PM
12/12/09 04:22 PM
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Joined: Apr 2004
Posts: 1,981
SE Michigan
TS3303
top fuel
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top fuel
Joined: Apr 2004
Posts: 1,981
SE Michigan
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Quote:
One other variable is the coefficient of drag and frontal area of each vehicle. It does make a difference.
I agree. weight also. Compare yours, Al's and mine. you and I have the same head (-500 lbs) 15mph diff. Al has 25% more flow (+500 lbs) and run almost the same mph. Streetwise is also correct in chassis efficiency. Your ladder bar chassis could be more efficient and Al has more left in his also. I think I was lucky and had just the right match of parts and combination.
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Re: Cylinder Heads and Horsepower
[Re: SuperStocker]
#550890
12/12/09 05:04 PM
12/12/09 05:04 PM
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Joined: Jan 2005
Posts: 12,430
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,430
Kalispell Mt.
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Another thing is the bigger motors are in similar sized cars to the littler ones, both size motors are pushing the same aproximate frontal area and if it costs both motors say 200 hp at a given speed the bigger motor will have more spare power for acceleration and apear to make more hp even if flow when up proportianly.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Cylinder Heads and Horsepower
[Re: S/ST 3040]
#550891
12/12/09 08:37 PM
12/12/09 08:37 PM
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Joined: Oct 2007
Posts: 4,213
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,213
New York
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Better statement:
Peak CFM x .257 x Number of Cylinders, provided that the mean velocity does not fall below X during the torque range.
Otherwise, it "proves" that replacing a TF intake port with a 4" sewer pipe doubles HP.
Boffin Emeritus
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