> > Hi Paul.
    > > I'm looking for 1.85 planetary reduction drive do you know
    > > witch gear it is out of the transmission,whether it is the 3rd
    > or
    > 4th?
    > > Could you let me know .
    > > Thank you.
    > > Henry.
    > >
    > >
    > > It is the current same part as Tracy is using for the 2.85:1. I
    > am
    > > not sure
    > > of the part number but I can guess it is this number 15 in
    > > this page from the Slauson Transmission parts catalog.
    > >
    > > Slauson Transmission Parts
    > > 15407 S. Broadway St.
    > > Gardena, California 90248-2207
    > > U.S.A.
    > > Phone: (800) 421-5580
    > > Fax: (310) 768-8298
    > > Web: http://www.slauson.com/
    > >
    > > It won't work as is. You will have to take power out of the
    > > ring gear and hold the planet carrier stationary. Consequently
    > > there will be some serous machining on these parts.
    > >
    > > Paul Lamar
    >
    >
    > Ya got it backwards, for a 2.85 you take the power from the planet
    > and hold the ring gear solid.
    > Ken
    >
    > --------------------------------
    >
    > NO I don't :)
    >
    > He does not want 2.85:1. He wants 1.85:1 Ken.
    >
    > Calculations for 1.85:1 are trivial and merely C/A
    >
    >
    > Paul Lamar ...No rotor no motor.
    >
    > Hello Gentleman.
    > You are right I want the 1.85 to 1 re-drive, for the rotary its too
    > low.
    > I bought the RX7 engine but changed my mind. Now I got the Subaru
   2.5.
    > For this its better to use the 1.85 to 1 other wise the engine would
    > rev. to high.
    > The RV 9 is rated for 160 hp and with 1.85 will be just right.
    > I didn't find those gears yet.
    > Thank you.
    > Henry.
    >
    > Log on to http://www.slauson.com/ and register.
    >
    > Paul Lamar
    >
    > BTW what does that Subaru weigh?
    >
    > --
    > Paul Lamar ...No rotor no motor.



   Just wondering how you figure to get 160 hp with a 1.85 ratio. With a
   stock SOHC 2.5 you'd be more like 135-140 hp.

   Ken Bauman


   -----------------------------------------------------
   Typical of the piston guys. Good point Ken.

   Piston guy: "This Corvette engine here is 400 HP!"
   Me: "What PSRU ratio are you using?"
   Piston guy: "1.3:1!"
   Me: "Well lets see the Corvette engine is rated
   at 400 HP at 6000 RPM. A 1.3:1 PSRU is only
   going to allow it to rev to 3500 RPM assuming
   the prop is limited to 2700 RPM! That is a little
   over half the HP."

   The truth it freaks them out to run it at full power for
   five minutes. Sounds and feels like it is going to explode
   at any second and it will sooner rather than later :)

   Very very few people have ever heard or been around car engine
   running at full chat... full load for five minutes. It is scary :)
   Running it in the car in neutral at 6000 RPM does not count.

   Actually that is probably harder on the piston engine but it does not
   sound all that bad. The reason it is harder on the piston engine
   is the inertia force of the piston and rod on the crank dominates.
   Load tends to balance the inertia forces.

   The full load full HP situation NEVER happens in a street car. Not
   unless you are on a banked track that allows you to run it flat
   out peddle to the metal.

   Paul Lamar ...No rotor no motor.

   It weighs about 180 lb empty with nothing on.
   The Engine will produce only 90 hp at 4400rpm, times 1.85 = 166 pone-es.
   Henry.

   ---------------------------------------------------------

   I think you are off on your physics Henry. The gear box does not
   multiply the HP. As far as I can tell the late model 2.5 liter NA
   engine is 168 HP at 5600 RPM.

   Given 168 HP at 5600 RPM and you ran the prop at 2700 RPM you would
   not quite get 5000 RPM out of the engine. Lets say it is 5000
   so the HP would be about 150 HP roughly. Perhaps a bit more
   due to a fat torque curve. Not too bad.

   The 166 ft pounds of torque at 4000 RPM is of little use
   in an airplane with a fixed pitch prop. The prop is turning
   only 2000 RPM while the engine is turning 4000 RPM
   so the prop does not load down the engine.

   Paul Lamar ...No rotor no motor.

Would the 2.5 not produce more power?  If you would test it on the
output shaft.
Hook up the Dy-no on the reduction gearbox and the engine is puling the
input shaft.I don't know how to ex-plane it.
Henry.


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