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Discussion Starter #1
Have you guys seen the new gear drives allowing ya to run two F2 prochargers at once?
I was wondering whats everyones thoughts on it..
Is two F2`s better than running one F3r 131 on a small tire heavy car?
 

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A1 Phuckstick
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I don't know if the amount of power to drive two F2's would be worth it instead of a single F3. Where's Morris when you need him!
 

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Discussion Starter #3
I don't know if the amount of power to drive two F2's would be worth it instead of a single F3. Where's Morris when you need him!

lol i didnt even think of that... I`m already runnig a F2 had goodluck with it gonna step up to the F3r. I`ve just been seeing these twin deals in some of the fastest street car mags and it got me thinking.... And i hadnt seen anyone else talking bout it... Steve which is better!!!!!!!! lol
 

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mfi turbos rule
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Have you guys seen the new gear drives allowing ya to run two F2 prochargers at once?
I was wondering whats everyones thoughts on it..
Is two F2`s better than running one F3r 131 on a small tire heavy car?
yeep,

travis quillen is currently tuning / building one now....
mechanical fuel injection, 632 cubes , twin F2's
52+ PSI BOOST

he goes under "turbopromod" on this site
 

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Procharged SBC Enthusiast
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I would suspect that it would only be worth using if you had more than 540 ci. It would have to take alot of power to turn two F2s.
 

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I am curious about this too, my pockets are not deep enough to be in the game so I don't know if procharger makes custom impellers to create a compressor map different from any of the stock ones. If not I do not understand how you would efficiently get 52+ pounds of boost from a compressor designed for a max of 40.

As far as the flow goes the combination of the biggest f-2s creates 37.5% more flow than the biggest single f-3 so on a big inch motor like a 632 you would really have something.

Of course my dream engine has always a 5.080 by 4.5 inch 730 semi hemi (or prefferably, with the wedge heads they had talked about due to the reduced wieght) with twin f3s this would allow you to have a great rod/piston/ring package and an engine that would rev with a wide power band, good efficiency and relatively low maintainence.

Maybe His Highness Sheikh Khalid Bin Hamid Al Thani will read this and help me out ;)

Richard Gavle
 

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Roll Tide!
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We're putting one together for our radial car... We have twin F1R's though- we'll see how that works and move to F2's if needed...

Hopefully it will be running in a couple weeks! I'll be sure to post results.

 

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theres a guy in my area with 99 stang 588 bbf with 2 f-2 just got it running shakedowns at 22lbs. of boost 4.97 in a 10.5 outlaw car pretty neat looking to see how its all done
 

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There is a guy in my area running twin f3 on a bbc in 10.5 outlaw makes alot of power but has not had much luck getting it down the track i think 4.60 fastest so far.
 

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Hey 1970 Mustang,

Do you know much about the combo?, I assume the f3s are side by side not sequential?

Thanks in advance for any info you have.

Richard Gavle
 

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last fall twin f2`s on 632 big chief on alky ran some .96/.95/.99 60ft. on pro-mod tire. that is all the guy would say. lights out passes, but has switched back to f3r
 

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To tell the truth I just don't know. I built and tested a twin F2 on a 540 of mine. it was a belt drive set up and was not as good as a single F3-139. I have staged them too. Problem was i was paying for it out of my pocket with no help so I bailed. this was all about 2 years ago before Reese did his deal. the math seems right, the aplication has not shown itself yet. I have given some quotes on these engines, I am sure it will work, it will just take some deep pockets to do it.
 

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Hello Steve,

When you say Reese did his and the math seems right are you talking about staged f2s or parallel f2s?

If one had really deep pockets how would you feel about my idea of parallel f3s on a Sonny Leonard 5.3 motor with a 5.080 bore and 4.75 stroke it would give you 770 cubes with a decent ring and rod package and a great set of heads.

PS I don't want you to fund it as this might sway your opinion ;)

Richard Gavle
 

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Theory says it's the same reason why the modular 4 valve is that much better than the modular 2 valve - two 1" diameter valves flow much more than one 2" diameter valve. Getting the theory to work in a real world application...well, that's the trick we're all trying for here.
 

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It's about volume....Turbos can ramp boost pretty fast under right conditions faster than a blower because blowers are geared/pullied etc. I still feel with the F1R having a 70k rpm vs the F3 being mid 50s it would work better to compound the two and gear where they both reach max rpm at the same engine rpm. This would make the F1R spin much faster down low giving more boost/power before a single F3 would.. With these guys running alky it's no different than a roots pro mod setup stacking 50 psi..... the engine does not know which blower you're running. Even with large boost levels the blowers are not working as hard because it's compounded.
 

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I wonder how the dynamics of engineering a larger compressor wheel affect the progress of the superchargers? I would imagie even with a billet wheel the size becomes a problem, since like so many things you can't just scale it up to double it's original size and expect the problems to only double.

Richard Gavle
 

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I wonder how the dynamics of engineering a larger compressor wheel affect the progress of the superchargers? I would imagie even with a billet wheel the size becomes a problem, since like so many things you can't just scale it up to double it's original size and expect the problems to only double.

Richard Gavle
Flow gets more complex as the relative airspeed is increasing at the tips. Assuming you run the same kind of RPM's.
 
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