Dean,
I am missing one bit of information.. ok maybe more than one but:
Does the 948 have a harmonic balancer?
If it does is it possible to install it backwards?
.. and how is the Judson for a 948?
Thanks,
Lester
On Jul 27, 2004, at 2:57 PM, Dean Hedin wrote:
> I'm certain the pulley is 4 inches in diameter for the 948
> (1 to 1 drive ratio, same diameter as the pulley on the supercharger).
> It's aluminum. It is machined with a raised step that fits against
> the
> recessed surface of the existing 948 crank pulley.
>
> Side view looks like this:
>
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>
>
> The existing 948 crank pulley has 6 rivets on it. To accommodate
> this, the
> Judson pulley has shallow holes index drilled on the back surface that
> the
> rivet heads can fit into.
>
> The hole in the center is that which will accommodate the crank bolt.
> The
> Judson pulley is recessed (rather deeply) on the front side to
> accomodate the
> bolt head. With the pulley on and the bolt tightend up, I'm
> guessing that
> the crank bolt is out about a 1/4" from it's normal position.
>
> Because the cross member gets in the way, you can "thin" the head of
> the
> existing crankbolt on a metal lathe. This makes it easier to get it on
> without having to jack the engine up.
>
> Getting the pulley on is probably the hardest part of a Judson
> installation.
>
> As I have expressed on this list before, I would not run a Judson on
> the 1275.
> Here's why. The unit is sized closely to the engine displacement.
> To get
> the same boost on a 1275 you will have to overdive by about 30%.
> Since
> cetrifical force increases with the square of rpm, the forces on the
> vane
> tips will be much greater.
>
>
>
> On Tuesday 27 July 2004 03:07 pm, Lester Ewing wrote:
>> Ahem.. the 948 does NOT have a harmonic balancer?? I just hate it
>> when
>> the PO does stuff to a car and I don't have the knowledge to know the
>> difference..
>>
>> Lester
>>
>> On Jul 27, 2004, at 9:03 AM, Robert E. Shlafer wrote:
>>> Guys...
>>>
>>> The 948 Judson pulley hookup is different
>>> from that on the 1275. The 1275 had a
>>> harmonic balancer type of pulley while the
>>> 948 did not.
>>>
>>> The Judson kit included it's own pulley
>>> (having been designed for the 948)
>>> and having no experience with the 948 set-up, I shall defer to those
>>> who
>>> do.
>>
>> snip
>>
>>> Cap'n. Bob
>>> '60 :{)
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