944Hybrids: 924/944/968 and 928 V8 Conversions
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HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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Stock Porsche P/S Pump on LT1

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Stock Porsche  P/S Pump on LT1 Empty Stock Porsche P/S Pump on LT1

Post  sbwrench Sun Mar 27, 2011 8:07 am

Has anybody adapted the stock Porsche pump to an LT1? I saw the thread on the LS forum (xcshop) but was wondering if anybody has made a bracket and pulley for the LT1 yet. I've been running the Turn One pump for at least a couple of years. It works great but is still nosier then I would like it to be. Unlike stock GM pumps that get noiser and noiser until they die, this one started out a litttle noisy and has remained the same. I have almost all the other little annoying things fixed; wipers, short shifter, window buttons, broken cv's, etc, etc.

If I had a dead quiet pump on this thing it would be really quiet at idle and in general nicer all around. Thanks for any help.

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Stock Porsche  P/S Pump on LT1 Empty Re: Stock Porsche P/S Pump on LT1

Post  xschop Sun Mar 27, 2011 9:25 am

I have this original bracket left (black marker area CNC'd away too). It fit the 944 PS pump on the driver's head of the LS 5.3
If you or someone wants to mock it up on an LT, you are welcome to it. Just remember that the adapter pulley you build needs to be 1:1 ratio with your LT1 crank pulley diameter....
What is this dimension on the LT1?...
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Stock Porsche  P/S Pump on LT1 Empty Re: Stock Porsche P/S Pump on LT1

Post  sbwrench Mon Mar 28, 2011 7:29 am

Best I can tell it's right around the same as the LS. Approximately 7 inches. If I fit the pump in the stock LT location the best I can get is around a 6.5 inch pulley before I run into things. One of the big advantages of the LS is that GM mounted all the accessories to the block for reduced NVH. On the LT I have to figure out how to incopororate it into the accessorie tower. Anybody got a used pump for sale, cheap?

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Stock Porsche  P/S Pump on LT1 Empty Re: Stock Porsche P/S Pump on LT1

Post  xschop Mon Mar 28, 2011 9:52 am

6.5" diameter pulley would work, it's the fact that it would rotate CCW. An adapter bracket could be made to fit the 944 pump in the original location and offset pulley made. Also looking at the LT1 serp set-up, it would be easier to have the 944 PS pump where the AC was or on the driver's side with a tensioner on the driver's head.
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Stock Porsche  P/S Pump on LT1 Empty Re: Stock Porsche P/S Pump on LT1

Post  948 Mon Mar 28, 2011 10:13 am

Al,
I have bought a used pump with the intention of replacing my noisey LT pump....Just haven't found the time to really do anything.
Looking at it initially, I think it should fit in the same area as the current pump but would need a pulley with a deep offset and a mounting plate. That's about as far as I have gone....If I get anywhere I'll pass on the info.
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Stock Porsche  P/S Pump on LT1 Empty Re: Stock Porsche P/S Pump on LT1

Post  xschop Mon Mar 28, 2011 10:16 am

Isn't the factory LT1 PS pump rotation CCW?
I can't believe someone hasn't stuck on the 944 pump (instead of AC comp) and alternator like this....

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Stock Porsche  P/S Pump on LT1 Empty Re: Stock Porsche P/S Pump on LT1

Post  948 Mon Mar 28, 2011 11:59 am

xschop wrote:Isn't the factory LT1 PS pump rotation CCW?
Ahh, good point......I said that I haven't given it much thought, and it shows. Laughing

I think that the lower DS would be the only choice for me; i like my AC too much.
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Stock Porsche  P/S Pump on LT1 Empty Re: Stock Porsche P/S Pump on LT1

Post  xschop Mon Mar 28, 2011 12:06 pm

That crank groove to block face dimension in the first pic is 121 mm. I have my flash drive in my pocket today LOL.

So the F-body crank pulley would be 102mm

Someone needs to confirm the LT1 dimension.....

Here's the 944 pump dimension.... The pulley offset can be calculated from thereon....

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Stock Porsche  P/S Pump on LT1 Empty Re: Stock Porsche P/S Pump on LT1

Post  sbwrench Mon Mar 28, 2011 1:30 pm

Interesting. I also run a/c so I need to utilize the stock p/s location. I just need to get a pump, pull the tower off and fiqure out where it all needs to go. Of course mines a little trickier. It started life as b body and then got switched over to f body and the damper got milled shorter to match the f body accessories. I'll get a good measurement on the damper diameter. I know I won't be able to get one to one ratio but should be able to get close. The rest of the car is so nicely sorted that the whine from the f body pump makes me crazy!

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Stock Porsche  P/S Pump on LT1 Empty Re: Stock Porsche P/S Pump on LT1

Post  xschop Mon Mar 28, 2011 1:34 pm

Confirm that LT1 dim (block face to 1st groove valley) and I'll post the dims for the billet March pulley adapter puck if it will work.

I have the drawings at the shop, But IIRC the hole I punched into the pulley is 1.950" and the adapter puck interface is machined to match and when bolted to the front of the pulley sets it back .75" (F-body)compared to bolted on the back (truck offset)
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Stock Porsche  P/S Pump on LT1 Empty Re: Stock Porsche P/S Pump on LT1

Post  xschop Mon Mar 28, 2011 3:49 pm

Have Fun....

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