My ongoing project car

N.RotaryTech · 12-12-2010, 07:24 AM

If anyone is confused,
I have two motors,
one is a street-ported S5 na, mainly the primaries are ported.
the other is my Bridge-ported S4 na, mainly the secondaries are ported.

Im planing to use the S5 center plate in the S4 engine.
I also plan to use the 9.7 compression rotors from the S5 engine, if that's what they are.
Also plan to use the stationary gears from the S5 engine because there in better condition. And will probably use the oil pump too.

This afternoon I'm going to take apart the S4 bridge-port motor.

Dyno & performance?
When I ran this HBP engine before, according to my butt-dyno I could spin the tires around the top of 1st and cherp 2nd, this is with an open diff.
Im going to swap in a LSD along with this build.
I heard from someone, that with an LSD if you can spin or cherp the tires, you might have around 200hp.

With this build, this time around, its not really all about the porting or the center plate and its porting.
Its first about replacing the O-rings and gaskets with new ones, second its about the porting.

Any other bits of info are...
I'm thinking about...
Going with the S4 intake manifolds.
And stock ecu for now.
Getting a exhaust header.
Going with out power steering, taking the bracket and pump out, since the original pump went bad.
And thinking of aux oil injection.

Peace.

12-12-2010, 07:24 AM	#11
N.RotaryTech Home-brew Rotary Join Date: Feb 2008 Location: GooseCreek SC Posts: 552 Rep Power: 18	If anyone is confused, I have two motors, one is a street-ported S5 na, mainly the primaries are ported. the other is my Bridge-ported S4 na, mainly the secondaries are ported. Im planing to use the S5 center plate in the S4 engine. I also plan to use the 9.7 compression rotors from the S5 engine, if that's what they are. Also plan to use the stationary gears from the S5 engine because there in better condition. And will probably use the oil pump too. This afternoon I'm going to take apart the S4 bridge-port motor. Dyno & performance? When I ran this HBP engine before, according to my butt-dyno I could spin the tires around the top of 1st and cherp 2nd, this is with an open diff. Im going to swap in a LSD along with this build. I heard from someone, that with an LSD if you can spin or cherp the tires, you might have around 200hp. With this build, this time around, its not really all about the porting or the center plate and its porting. Its first about replacing the O-rings and gaskets with new ones, second its about the porting. Any other bits of info are... I'm thinking about... Going with the S4 intake manifolds. And stock ecu for now. Getting a exhaust header. Going with out power steering, taking the bracket and pump out, since the original pump went bad. And thinking of aux oil injection. Peace. __________________ '89 RX7 GTU, half-Bridge-port S4/S5 NA, E6K, Full RB exhaust, weekend warrior. '83 RX7, The "this might take awhile" project. '87 RX7 GXL, Rest In Pieces. '98 Subaru Impreza Outback-sport, rx7 rescue vehicle, down for repair. '94 Ford Ranger, daily.