Bill Ball

Yes, the stock gaskets were a bit messed up with 1/8" spacers. I then cut spacers that were slightly thicker to compress the gasket only 15-20% instead of 1/3rd and that's what we used to install the manifold on the new owners car after I sold the SC. That was not long ago. The car is running VERY well with no hint that there may be a manifold leak. There is no plan to remove the manifold any time soon to inspect the gaskets. Note the spacers need to be hard or the front one will become somewhat crushed.

Louie928

I did use 944 gaskets. That was on a late version of Andy Keel's intake. The bottom part of it was cast aluminum and quite stiff. However, it was not very smooth and each side was not in the same plane. The supplied linoleum type gaskets wouldn't have worked. When you put the manifold on the heads, it would rock from one corner to the other. It was a sand casting. I milled the gasket mating surfaces until they were flat and in the same plane. No rocking when put on the heads. There were spacers inside to keep the distance between top and bottom the same. The 944 gaskets are thin, but worked just fine. I can't remember what torque was used, but it wasn't a lot. Probably normal torque for an 8mm bolt. I used "The Right Stuff" for the bottom of the gasket and spray on "Copper Coat" for the top so the intake could be taken off easily if it had to come off. I remember putting on The Right Stuff, laying the intake on top and leaving it overnight. Then the next day, I took off the intake and trimmed The Right Stuff where it had squeezed out into the ports. Then sprayed on the Copper Coat and put the intake on for good. I had also port matched the intake to the cylinder heads and rounded the inside top of the port holes in the manifold to aid flow. It was a lot of work, but the engine ran perfect with a lot of power when it was all done.

The 944 gaskets were used mainly because they were thin and I needed all the space under the hood I could get so the SC pulley wouldn't hit the hood.

dprantl

Thanks Bill/Louie/Ralph. Since slightly larger spacers worked for you Bill, I am going to try the stock gaskets with 3/16" spacers. I have a 2.25" pulley, so I think having the assembly sit 3/32" higher will not be a problem. I just have to machine off the Jag 3-bolt bracket on the supercharger, since that is still there. I will probably use Right Stuff on one side of the gasket as added insurance.

Dan
'91 928GT S/C 475hp/460lb.ft

Ralph Newman

My original idler pulley bearing is going south. Does anyone have a recommendation for a replacement pulley?
Thanks

Mongo

This is slightly off topic; I came to San Diego to visit family this weekend and my Dad bought an SLK 230 for my Mom. It has had some problems passing smog and OBD codes are pretty much related to the secondary injection.

Aside from that, the real reason I am bumping this thread is that the design and setup on this car intrigued me. The Eaton supercharger is mounted in an inverted fashion. This is something I have yet to see on a 928. I am aware the water jacket/thermostat housing as well as the oil filler may may things a little tight here. Of course, those with Eaton setups already have the filler deleted and add oil elsewhere (I don't know how the hell you guys do it since I'm so used to pulling off that damned cap and doing it). I am wondering if anyone has undertaken a project to mount the supercharger inverted on these cars.

victor25

Andy
Yes it has been attempted a few times, and yes the problem is that thermostat housing and hood clearance issues. If you go back about 2 years 1-9-2010 on this thread you will see a really cool design and attempt or two.

dprantl

On the other hand, check out the engine bay of a C32 AMG. It is pretty much identical to a MAF-less 928 with a top-down twin-screw supercharger. In fact, the air tube configuration is the same too (pulls air from above the radiator and S/C inlet is at the back by the firewall), and it has neat dual side airboxes. The intercooler design/inlet/outlet is very nice too and IMO better than the 928 supermodel design. 109hp/liter @ 14.7psi boost stock.

Dan
'91 928GT S/C 475hp/460lb.ft

Mongo

I'm going to look for a picture and post it. Somehow I was bitten by the supercharger bug from a 4-cylinder chick car this weekend.

heinrich

I have a like-new Jag Eaton M220 I can sell whoever wants one. With a good bracket.

Mongo

This isn't the greatest picture, but you get the idea.

I really would like to know how those intercoolers look integrated into the manifolds. I am looking around for this on ebay as I type this.

Mongo

Kleeman has an aftermarket supercharger for M112 V6s (same V6 in W202-W204 Mercedes). I believe a similar setup may be possible to fit under the hood, but that damn oil filler and water bridge is too high.

dprantl

Here is what the C32 intercooler setup looks like. It is neat how the air goes down into the intercooler, then back to the firewall and splits out into two aluminum boxes that have intake runners. That picture you posted of a C32 engine bay is not stock. The intake pipes should be black plastic and there should be silver plastic air boxes by the sides with rectangular filters, like this:



Dan
'91 928GT S/C 475hp/460lb.ft

Mongo

That setup could work on a 928. I saw something similar designed by Blau928 several pages back. He definitely was on the right track. I don't know where he is at on this right now. The amount of R&D into it makes an old Andy Keel kit look dirt cheap.

Th Dude

Blau is gone....
https://rennlist.com/forums/8467166-post17.html
at least his S/C project is.

auzivision

A couple nice twinscrew cutouts from the autoshow in Detroit

Ford's:








GM:



Pushers on rockers with pineapple upside down coolers







Maybe is just me, but it appears they have raised the hems on those piston skirts. Hey the rear on the new Caddie is not too bad either.