Marcel Burkett

Looking at the pis in the post "twin turbo II turbos" , the manifold offered by DYSON ROTARY has a short runner and a long one too , what effect would this have ( if any) on turbo / engine performance , anybody ? , thanks . .

rotarygod

iTrader: (1)

I wondered that myself since I'm the person who started that thread. I planned on making mine of equal length.

Bridgeported

I know the best way to make manifolds on street RX-7's is equal length configuration.
I suspect on a twin setup like that with one runner being longer, that the turbocharger on the long runner might take a slight bit longer to spool (probably wouldn't be enough of a difference to matter or notice really). Just assumpions, I don't know if this is what would happen.
I was also wondering this when I saw that picture.
I would just make mine equal length.

turbostreetfighter

it is going to be VERY difficult to make a equal length twin header in a street car if not impossible!! dont fight it, just make it fit in the car!it will not make that much of a difference in a street application anyway.


MWW

rotarygod

iTrader: (1)

You should know Marcus!

Node

iTrader: (1)

I've seen equal length twin turbo manifolds. Or close to it, front went up high, rear rotor went below and below the top turbo. I think thats how it was.

peejay

Do you mean by that that the turbos were basically stacked directly atop each other? That'd be the only way I could picture that working without the front turbo's downpipe getting unfriendly-close to the rear turbo's compressor inlet or outlet.

I think I'd rather have unequal lengths than deal with the ugly mess that setup would create, anyway! I'd imagine the header wasn't exactly a straight shot either.

Hmm... If you were starting from scratch, have two T3 sized turbos, one opposite-rotation of the other, and mount them opposing each other with a merged downpipe, similar to the FD layout.

Node

iTrader: (1)

hmm, interesting idea. but where to get one with opposite rotation? Only time I've ever heard of a turbo being opposite rotation is on some of those ford turbo diesels

rotarygod

iTrader: (1)

I toyed with the idea of reversing one (in direction) in a similar setup firing one backwards and one forwards but that is one long assembly. I've seen it done on a tube frame 3 rotor drag car from Puerto Rico (Remember this one Marcus?) but he had tons of room. It would be cool to have the exhaust ports fire directly into the turbos though.

You can custom order most turbos in a special reverse rotation configuration. Marcus's twin manifold was pretty close to even length.