slo

iTrader: (1)

I sold a complete almost new 200? or late 1990s V8 explorer motor for 600 dollars last year.

I want to see someone put a ford flathead V8 into into an Rx7, it probably wouldn't make as much power as reliably as the rotary, or even get as good fuel economy. But it would be different.

The rotary versus piston debate allways reminds me of my senile (by that time) grandfather throwing an egg at his neibor for having a ford hotrod with a SBC.

aussiesmg

iTrader: (1)

WTF, please don't so blatently reveal your ignorance, this is a legitimate enquiry, I have heard the weight difference varies from 20lb to 150lb and I do not want to add 150lb to the front of my car.

pat57woods

This is what I found online from some guy that has way to much time on his hands. All I know is that My 84 GSL-SE with a 89 Carbed 5.0 and AOD weighs 2550 with racing seats and no back interior. When you add the ac and the rotary exhaust, (the muffler alone weighs 40 lbs), the 12a is not that light of a system. If you use a t-5 over the AOD you'll save another 100lbs.

Mazda 12A and 13B 260
Mazda 12A rotary 348 (RX7) (with oil and water)
Mazda 12A rotary 356 (Japanese model turbo, EFI)
Mazda 12A rotary 275 (w/flywheel, t.reactor, no alt.)
Ford 5.0 V8 450
Ford 5.0 V8 411 89 Mustang 5.0 GT (dry) inc: manifold,
carb(?), headers and alternator. Not inc: starter, smog pump, power steering pump, AC compressor, flywheel
Ford BOSS 302 500

aussiesmg

iTrader: (1)

So lets say 135 lb more approximately for the 5.0 then less 40 for aluminum heads and less again for aluminum water pump, flywheel, high torque starter, headers, and lifters, so very roughly the difference should be less than 70 lbs, for a 300 hp engine at least. This is assuming the T5 is about the same weight at the Mazda box. That most definately works.....

Thank you for a responsible reply Pat...

pat57woods

Don't forget if you go FI or use a low rise intake you can fit it all under the hood, and move the batter to the back, it will replace the weight you took off the back when you dumped that stock muffler.

stilettoman

iTrader: (1)

"All I know is that My 84 GSL-SE with a 89 Carbed 5.0 and AOD weighs 2550 with racing seats and no back interior. When you add the ac and the rotary exhaust, (the muffler alone weighs 40 lbs), the 12a is not that light of a system. If you use a t-5 over the AOD you'll save another 100lbs."

That agree closely wih mine. I weighed it on a very accurate set of electronic scales. My 1984 GSL weighs 2550 fully serviced, but without fuel. Full leather interior, electric windows, sunroof, no AC, no power steer. 5.0 roller cam, Comp cams stainless roller rockers on Edelbrock aluminum heads, Edelbrock carb and intake, aluminum rdiator, light weight Hedmann headers, AOD tranny with small diameter PI converter. The AOD with the small converter weighs about 170 pounds, and this is most of the added weight, as others have said. Remember the tranny is pretty far back towards the center of the car. I personally think all the fuss about trying to achieve 50-50 balance is nonsense. With all this torque you can make the car oversteer any time you want.

I am running the stock rear end, but with the later 5 bolt hubs and brakes, front and rear. For street driving with the stock rear end, you will definitely want an overdrive tranny.

I used the Ford E303 cam and the performance is good, but If I had it to do over, I would run a stock Mustang GT cam or similar to get smoother low speed running. For a daily driver you might be happy with a 250-270 hp 5.0 / 302. It is the torque that makes the car fun to drive. I can outrun most cars on the freeway from 40 to 70 without downshifting out of overdrive.

If you want a fire-breathing monster with 500 horsepower, start with a Corvette.

www.cardomain.com/ride/646433

pat57woods

More detailed PDF of the Motormounts. Just passing along all the awesome info I got on this site a couple years ago when I did my project. Also here's the pull slave cylinder you need to use a T-5
Wilwood's PN# 260-1333.
WIL-260-3376. Summit has them for $65