Originally posted by RacerX7fb A buddy of mine already has made a 4 rotor built from 12A parts. He's on his way to Kentucky to pick up an FD shell to put it into. The engine has a custom machined eccentric shaft and will be turbocharged: http://www.autotechmotorsports.com/projects-4rotor.htm congratulations, I'm happy for him. However, I'm going n/a, carbed, and into a SA/FB shell specifically built for Bonneville, while maintaining street legality. |
http://pineappleracing.com/ProdSvcs.html
While 2-rotor rotary engines are the norm, Pineapple Racing can claim to be one of the few shops to have worked on 1-, 3-, and 4-rotor engines, as well. -bp- |
Pineapple was who I was originally planning on getting the e-shaft from, but it looks like, if possible, MarvelSpeed is gonna be building my entire motor. THANK GOD FOR HOOKUPS!
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Now I still don't know about 3 or 4 rotor E-shafts prices... :-( Come on, is this really as expensive as the original quote by Chef?
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Pineapple said $1899+shipping (USD)
MarvelSpeed said they would *probably* include it in the engine buildup price. |
Originally posted by CHEF_EG_1 congratulations, I'm happy for him. However, I'm going n/a, carbed, and into a SA/FB shell specifically built for Bonneville, while maintaining street legality. Using your carbed 4rotor 12a, you may not even come close to the HP figure that racing beat had. In comparison, to stimulate some though, the 4 rotor R26B in the 787B race car, is fuel injected, tripple spark plugs, with complicated trumphet intake system makes in excess of 700HP. I doubt that your custom 12a 4 rotor utilizing a carb and non supercharge/turbocharge, with an unproven custom shaft design will even come close to those HP figures. Have you tried computing in paper the weight of your car, wind resistance and how much HP you need to reach your target speed? Just curious, how many attempts have you done at Bonneville? :cool: |
rx720bt: all valid questions and concerns. MarvelSpeed in TX (Dallas, I believe?) is doing most, if not all the motor build. I have emailed them (Don Marvel) with the exact specs of what I want. I am still awaiting a reply on pricing.
With a full fuel cell (18gallons), 2-15# nitrous bottles, airbag setup, full rollcage (12pt.), lexan rear/side/ 1/4 windows, 2" chop from the roofline, custom made windshield (2x thickness, with 2" chop already), belly pan, 15x4.5" wheels, GoodYear Eagle Land Speed tires, extra aerodynamic spoilers (either aluminum or carbon fiber), and 2 occupants (a friend has agreed to pay me 1000 to ride shotgun for the ride), I *should* be right around ~2800#. With a 1.92 final gear ratio, a Tremec T56 from either an LS1 or a Viper (not yet decided), the engine tuned to run at a strong 8grand for 3 minutes or more (of the two course choices, 5 or 7 miles, I am choosing the 7 mile one), and 2-200shots of nitrous, I should be well ahead of my required 776rwhp. I am looking closer to 1200, maybe 1300. With a coefficient of drag at a near perfect .27 based on the CAD designs, and a lower frontal area due to the 2" chop, I *should* be right on the money. From a friend.... RR=W*.013 AR=fA*Cd*.00256*tV^2 whp=((RR+AR)*tV)/375 RR: Rolling Resistance AR: Air Resistance W: weight fA: frontal area of the car Cd: drag coefficient tV: desired top speed whp: required wheel horsepower These are the values I used to calculate your whp, which are pretty generous... W=2420 lbs (stock weight of a 79 rx7...I imagine it will weigh more with the bigger engine and HD transmission that you will need) fA=20 sq. ft. (usually anywhere from 19 to 23. Just guessing here but I gave you the benefit of the doubt) Cd=.30 (usually varies from .30-.40. Again giving you the benefit of the doubt) tV=264 mph Using these numbers I get required whp = 776. Assuming a drivetrain loss of 15%, required crank hp=912. |
By plugging in my numbers....
W= 2800 fA= 19.5 Cd= .27 tV= 264 Required whp = 686.95hp Assuming drivetrain loss of 15%, required crank hp = 790 |
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