In a message dated 97-04-10 18:47:54 EDT, tleeming(at)island.net (Tony Leeming)
writes:
<< The Series III was the only Series with a 3.89 rear
end for both overdrive and std. transmission. This means at 3000 rpm
with O/D and a 3.89 rear end, you should be ripping along at 64.2 mph.
So, if you are planning long distance motorway cruising - this is what
you need. My experience with this set-up is great and I say go for it!!
( Tony said that, Chuck!!)
By the way I am running on 165-80-13 on 5J Wheels
Good luck!
Tony Leeming
63 SeriesII Alpine >>
I can wholeheartedly agree! When I first put an OD trans in my SerV, I did it
the "correct" way, and changed the final drive as well. I was less than
impressed. After a few calculations and a few long trips, I decided to put
the original final drive back in, and BOY, did it make a difference! 60mph in
OD top is about 2700rpm, on a tach calibrated to be accurate at 4000rpm. The
problem with factory tachs, is that you can only make a single adjustment, so
you can make it accurate only in one part of it's range.
This car will cruise all day long at 75mph, and not even breathe hard.
I drove it from NJ to Colorado for the 89 SUNI and back again, and never
missed a beat. Absolutely wonderful!
Jon Arzt Rootes2(at)aol.com
PS. Now if I could just fit OD to my camper... OE rear was 5.63 to 1!
---------------------
Forwarded message:
From: tleeming(at)island.net (Tony Leeming)
Sender: owner-alpines(at)autox.team.net
Reply-to: tleeming(at)island.net (Tony Leeming)
To: sdoerrer(at)ix.netcom.com (siegfried)
CC: alpines(at)autox.team.net
Date: 97-04-10 18:47:54 EDT
siegfried wrote:
>
> Brian Carpenter wrote:
>
> > According to Chris McGovern's book "The Classic Sunbeam"
> > "... the 3.89 ratio gives gearing at 18.7 MPH per 1,000 RPM in top, and a
> > genuine 100 MPH might be possible without over-revving." That is 75 MPH
> > at 4000 RPM or 56 MPH at 3000. Seattle
> > P.S. one more factor on the RPM/MPH is tyre [do you like that?] size. I
> > need a full set. Now have 175/75 R13. Any comments on size selection
> > would be appreciated
>
> I think my tyres (its catching!) are 175/70 R13, so the lower profile
> may be enough to make a difference - but my S.V is revving at about 5500
> mph at about 65mph. I don't know what current ratios are in my car but
> it seems low.
>
> Thanks for the tip.
>
> Siegfried
My .02 worth - I checked my Brooklands book last night and the Series
III road reports both indicate 17.2 mph at 1000rpm with Std.
transmission and 21.4 mph at 1000rpm with O/D . Both tests running on
6.00 - 13 tyres! The Series III was the only Series with a 3.89 rear
end for both overdrive and std. transmission. This means at 3000 rpm
with O/D and a 3.89 rear end, you should be ripping along at 64.2 mph.
So, if you are planning long distance motorway cruising - this is what
you need. My experience with this set-up is great and I say go for it!!
( Tony said that, Chuck!!)
By the way I am running on 165-80-13 on 5J Wheels
Good luck!
Tony Leeming
63 SeriesII Alpine
Gabriola Island British Columbia
Canada - Just a tad north of Wet Seattle WA
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