F4r

Just wondering if any one is using the new f4r pro-charger deal?

 

Its not out yet, still in development

 

Not quite true... There is one currently being installed on a V-1710 Allison V12 engine in Germany... Should be out soon, and should get them close to 3500hp on that engine over time (currently scratching 3000hp with the stock supercharger)

http://lh3.ggpht.com/_DCD-IYFyi-s/S5Fr2uFzl_I/AAAAAAAAKv8/Qtvb_2eErsM/s640/CIMG4546.JPG

 

Are Sascha and those guys running them allisons on a dyno to determine those HP numbers or what is that based on?

 

Yeah, they have a dyno... They had a video of a dyno pull with one of their Allisons online a couple of years ago... 2850hp as far as I remember... And they went a bit higher when they switched to EFI...
They used way more fuel than needed before, to keep the pistons from melting when gaining supercharger boost... Now they pretty much just run the engines more effectively, and by their own words, they will soon have the EFI systems paid in fuel savings...

 

I think Pro-Charger really missed the window on this deal. A few years ago myself and others were talking about the need for more volume and boost on large engines 420ci up, back then no one had done a bracket for twins yet and also it was untested territory. Now with quite a few people starting to run twin F2s and a couple of twin F3s in the works I think that its going to be a lot harder to sell the F4.

Now Pro-Charger has to convince people that the larger F4 will be just as efficient and durable as two smaller units, on top of that a lot of people already have one F2 or F3 from a previous effort so the cost thing (not that it really would make a big difference, with all the upkeep etc. but it seems that way when you are building something) comes into play also, on top of that packaging twins on a lot of door cars with low hood lines is easier with smaller twins....

Myself I really think that (during tire shake etc.) the strain on the transmission with the enormous wheel will be a problem, as well as compressor surge on the shift, with twins I feel these problems will be a lot easier to control.


Now on the other hand in a rear engine dragster, with the excellent aero package of a single F4 mounted on the end of the crank, it would really be the cats meow!

 

twin f3 s would be strong. think 1 will do me for now how much boost will a f3r make? what sort of power on alcohol should a 500 inch motor make?

 

same as a black and decker aquarium pump......

 

Shit- that much- i beta leave a couple of spark plugs loose to bleed off sum wally then