Hi Paul!: thanks a lot for the wonderful sendings about RCEs. I
have just one doubt: the title of this e-mail is: "12A Dyno Chart &
BSFC", this is one one best new year gifts I may have had, as I was
considering installing a Wankel RCE in my 1976 AMC Pacer base, now
it has a 4.2 lit (258?) 6-L engine with single vase carburetor, a
power of 98 HP, and a Chrysler Torqueflite 3- speed plus reverse
Automatic Transmission, I bought a Mazda Auto Trans for a RCE, and
as the power output of the Mazda 12A and of the 6-L AMC are roughly
the same, the AMC engine weighs near 400 pounds, I guess the 12A is around
135 pounds, just the gain in weight would improve overall car's
performance, and the only change needed may be finding the right
final axle gears ratio; a German autor Knapp, points in his book (in
German): "Wankel in the test bench", that by 1976 the fuel economy
of rotaries and contemporary reciprocating engines was roughly the
same, the promised data about 12A would be of great help to me,
provided the case it refers to an stock engine, and not to one
specially tuned and modified for use in airplanes.
So, hope it was a temporary mixing of e-mail titles, and having soon
the opportunity of looking at the 12A data, hope also finding a 12A
for sale in good condition.
Have a nice week, best regards, salut +
Jose Gros-Aymerich
I had no idea they sold those things in Spain.
The Pacer needs a 3 rotor :)
Paul Lamar
The 12A engines were about 200 pounds without the intake and exhaust. The cast
iron end housings and rotors are the problem. P-ported and you have 250 to 300
HP available. That is an improvement, BUT the torque is low for that car.
There is or was a 1940? Ford in the USA with a 13B engine. '40 Fords weigh
about 3500 pounds and the Pacer will be close to that. You would need 4:1
gears and maybe a turbo to make it perform. The Mazda Eunos Cosmo came in 13B
and 20B power. The 13B cars were slow accelerating. the 20B cars are fairly
exhilarating I hear. Both Eunos engines are turbocharged.
Dale Davies
Thanks to all of you!. Yes the AMC Pacer weights some 3'000 pounds, 1310 kg,
but if you reduce 100 kg (436 pounds) kg by installing a 12A instead of the AMC
6 in line, you're approaching to the total weight of 1950 pounds of an Rx3, or
the 2469 lb of the Mazda Cosmo, or Rx-5, that also had the 12A engine installed,
or the 2500 lb of the 1978-85 Rx-7, so, just an adaptation of the real axle
pinions to give an adequate rpm regime in the engine with the existing Pacer
wheels and tires may be enough, the Pacer had a top speed around 90 mph,
148 km/h, and the Pacer's heaviest versions, with A/C and all stuff, had a weight
of 3400 lb, some 1500 kg, it was fitted with the 304 AMC's V8, having an output of
120 HP, so, just with the weight gain from substituting the RCE, there must be no
great differences in performance from the AMC engined to a Mazda RC engined
AMC Pacer, I have the feeling that more power may put the car in the unsafe
category, as the body and suspensions are not designed for handling at
the much higher speeds a Pacer fitted with a 3-rotor or a 200 HP RCE may
reach, the rear axle is mounted on leafs.
The 12A, just with some streamlining in the intake-exhaust port intersection
with the epitrochoid surface, an straight angle is the arrangement with more
volumetric efficiency losses because of inducing turbulent flow in the
incoming mix, and a Little bit of duct polishing and streamlining may give
the 20 HP extra from the 12A that would suffice to deal with the added
weight of moving an AMC Pacer instead of a Mazda Rx-3, Rx-5 Cosmo, or Rx-7.
Early versions of 12A gave 110 Hp, this is more than the 248 ci, 4.2 L sv
carb 6-in-line AMC engine, it gave 98 HP.
Again, should you become aware of somebody offering a decent 12A (Street car
type) for sale, please give me the contact details, in order to see if we
can reach an agreement.
Nice week, reagrds, salut +
Jose Gros-Aymerich
Madrid, Spain>
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