Actually, if there's anyone thing that my 215 lacks, its torque,
especially with the Isky cam that I have. However, the doubled
displacement should offset this. It's still a light car.
Rich
> ----------
> From: Jarrid Gross (Yorba Linda, CA)[SMTP:GROSS(at)UNIT.COM]
> Sent: Monday, April 07, 1997 8:54 AM
> To: Richard Atherton (Entex); 'alpine clan'; siegfried
> Subject: RE: Vanishing Brake Fluid and Ring Gear Bolts
>
> Rich wrote,
>
> > I always felt the the stock 3.89:1 rear ends were to low to
> >begin with, and going even lower to 4.55:1 would keep if off the
> >freeways forever. I always felt that the perfect ratio was around
> >3.24:1 The Tigers 2.88 would have been too high. The 73' Datsun 510
> >wagon rear end that I bought for my conversion project had 3.24. I
> was
> >told that it used the same gear set as the 240 - 260 Z's. I figureed
> it
> >would be tough enough.
> >
> > 4.55 will wind it up tight at 70 on those country freeway miles.
> >
> >
> >Richard
>
>
> Well then, the only Rootes/Chryslor rear that will be suitible for you
> would be
> the 3.70. The gears will get no taller than that.
>
> A 3.89 equiped alpine will run at about 3450 RPM at 60 mph. This is a
> reasonable
> RPM, considering the little motor "yes even a stock one" will make
> peak
> torque
> at 3800 RPM.
>
> a 4.55 rear puts you at about 4050 RPM at 60, so unless you really
> like
> to rev
> your motor, you'd best have an overdrive.
>
>
> Acceleration comes at the expence of more gears or lower top speed.
>
>
> With a 3.70, the 60 MPH RPM will be about 3280, so the amount of RPM
> drop
> is not too drastic, nor will be the slight loss of torque.
>
>
> If you want to use a a lower numerical ratio yet, I dont think I
> would
> go too much
> lower than 3.70 because the motor will be running "outside the cam",
> and
> too
> much load can burn up those teeny tiny alpine exhaust valves.
>
>
> Iffen you are going to put a torquey V8 in there, then thats a horse
> of
> another
> color.
>
>
>
> Good luck!
> Jarrid Gross
>
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