89 Rag

As one project is wrapping up I am quickly becoming interested in yet another rotary project. I am not certain that many have experience but I am interested in opinions and arguements a-like regarding the topic. I am aware of the budget necessary to complete such a project and I can assure you I will make it happen one way or another, I wouldn't think of wasting anyone's time on a whim, so please, any constructive information would be greatly appreciated.



I have an opportunity to purchase a cloned 4 rotor if you will, essentially two 13B's bolted together, yes, the kind where the first and third would fire at the same time etc. I am also looking at a non-sequential approach with a turbo for each rotor, as much a plumbing nightmare as it may be, I want to entertain the idea for now.



I also want to stay with an RX platform chassis as well, it may need to me a mid-engine custom or moving the firewall around some to make room. It would be nice to keep it "street legal", and, I use that term so loosely, I am not really interested in a tube frame chassis with a body hung on it etc.



So there it is for now, let me have it, good, bad, or indifferent.

TYSON

Sounds like you'd need a 1 ton pickup to fit all that in the engine bay.

Jeff20B

Unfortunately, that's how it will sound too. It will sound like two 13Bs reving up together instead of an R26B. If you're ok with that, go for it.

89 Rag

[quote name='TYSON' date='Aug 21 2005, 11:34 AM']Sounds like you'd need a 1 ton pickup to fit all that in the engine bay.


[/quote]



of course, it may not be able to get stuffed in any rx type e-bay, but that is the purpose of this discussion, it may not be able to accomodate 4 gt30 turbo's either, but again that is the idea, find out what will work and what won't before a bunch of time and money is wasted.

89 Rag

[quote name='Jeff20B' date='Aug 21 2005, 11:43 AM']Unfortunately, that's how it will sound too. It will sound like two 13Bs reving up together instead of an R26B. If you're ok with that, go for it.


[/quote]



What is the alternative, machining a different E-shaft? what effect would that have on the rest of the engine?

j9fd3s

i might point out that the r26b is rated at 750bhp, i'll go out on a limb and say you dont really need turbos for this one



which also makes it easier to fit/plumb

89 Rag

[quote name='j9fd3s' date='Aug 21 2005, 12:30 PM']i might point out that the r26b is rated at 750bhp, i'll go out on a limb and say you dont really need turbos for this one



which also makes it easier to fit/plumb


[/quote]



Engine builders idea for the turbo per rotor, or wet dream.



I would imagine a bigger single wouldn't be out of reach either or two middle of the road snails would make the plumbing task easier.



To me, it really isn't about making gobs of tourqe and horsepower as the ultimate goal, it's really about putting a quality project together, in an rx platform, that isn't run of the mill. A challenge to put something unique together, if it makes gobs of power so be it, nothing more than a nice side effect, lol.

amp

ive heard that the differences from the block length in comparison with that of a 20b is minimal..

anyone know how they achieved this.. side housing thickness perhaps... doubt they would slice it off the rotor and housing...

heres a pic of guru racing 4rotor pport...

89 Rag

10A rotor housings?

SPEED_NYC

amp that 4 rotor you posted is done 'wrong' notice that the 2 center rotors recive less air flow than the outer ones do. if they were using the side ports (which dont apear to be blocked off) they would want a primary and a secondary runner per rotor. here only the end rotors have secondary ports. again, with the peri ports this isnt an issue. i guess thats why they didnt go to the trouble of using 20B center plates.



that is also the answer to your question amp. the 20B center plate with the one primary and one secondary port is much thicker than a 13B center plate. multiply that diffrence by the 2 center plates needed for a 4 rotor engine and you easily save a few inches in length by going peri port. this 4 rotor is prolly only 2 inches longer than a 3 rotor with the correct center plate. i guess the same thing could be said for doing a 3 rotor with peri ports or with using the jeff bruce modified 13B center plate. there 'short 20B's' as they're referred to are a few inches sahorter than real 20B motors. hitman has pics of his short 20B in his first gen on his web site. if i remember correctly he was one of the first 2 ppl to run a jeff bruce 'short 20B' motor (now sold through guru and others) about 5 years ago. pics and details should still be on his site