Jim,
You changed out the rear gear,but did you change the speedo drive gear to
correspond to thenew gearing?????I'd try and check the tach with a dwell tach
to verify yoursreads correctly at higher rpms if it wants to rev past the
redline.Or maybe you didn't put a 3.9 in there, but a 4.9 or 5.11??
Brian S.
Bugeyeracer finally resto'ed!
> Date: Tue, 7 Jul 2009 00:20:14 -0500
> From: bmwwxman@gmail.com
> CC: spridgets@autox.team.net
> Subject: Re: [Spridgets] engine questions...
>
> Hmmmm.... My 68 Midget with a 1275 and 3.9 dif doesn't come close to
that
> speed. It is in peices in the garage at the moment, but when I last had it
> out for a drive it was doing 60 mph at red line on the tach. WTF? It's
been
> that way ever since I got it 4 years ago.
>
> Like Ryan I figure on "refreshing" (love that word!) the engine though it
is
> only supposed to have about 6.000 miles on it per the PO. The main problem
> it has is serious oil leakage. It runs very well but apparently something
is
> screwy per the tach/speedo numbers you guys are talking about. WTF would
> cause this? Is the tach reading too high? It idles perfectly at around
> 800-900 rpm indicated when warm. I know the speedo is correct - I had
> Carolyn follow me at several different speeds and it is very close to what
> her new PU showed. Also, it is very free reving and wants to go past red
> line. I changed out the 4.22 dif for the 3.9 dif last spring - no
> difference. Downhill with a tail wind I can get 65 mph at red line but
> that's it.
>
> All ideas welcome....
>
> Cheers!!
> Jim
>
> On Mon, Jul 6, 2009 at 10:21 PM, Frank <spritenut@comcast.net> wrote:
>
>> ryan.kubanoff@comcast.net wrote:
>>
>>> i am driving a stock 1275 '74. on the highway i am concerned to push past
>>> 4k rpm's for any length of time.
>>>
>> Ryan
>>
>> The 1275 sweet spot is 4200 rpms, and it will run at that speed all day
>> long.
>> 4500 is probably 80 mph with a 3.9 which is what you have. It is a bit
fast
>> for all day driving but Ok for short bursts.
>> The machinist I use knows 1275s and for a couple of 300 bucks, he will do
>> everything it needs if you supply the parts.
>> $100 for the head work, you supply the guides, $30 a hole to bore it if it
>> needs it and he will polish the crank at the shop.
>> If the crank needs to be cut, he sends it out. He also installs the
pistons
>> on the rods which is another machine shop job unless you have the oven to
>> heat the rods to remove and replace the pistons.
>> I also have a couple of spare heads if you want me to drop one off to him
>> for a head job. Then you can just swap them out.
>>
>>
>> --
>> Frank Clarici
>> Toms River, NJ
>> My own Fleet of Sprites
>>
>> _______________________________________________
>>
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