Carl Fausett

PS: we are going to try to continue to use the Heavy Duty belt tensioning turnbuckle that you have now (it tightens the belt for the AC and alternator). That means it will now also tighten the belt for the supercharger.

Again, fewer parts = lower cost and easier installation.

We try to be elegant and streamlined in our designs. The best designs are as simple as possible yet meet all design goals.

lsinlv

go info, Thanks Carl.

A question I have is:

in the past with previous S/C intallations, the issue of belt wrap on the charger pulley VS. belt slip has created some interesting solutions, but all of which tend to add a substatnial load on the other shared belt driven accessories; even when using an "idler" pulley for the charger.

what are your thoughts on the additional belt load/tension required as to the longevity of the a/c compressor and/or alternator??? nether of which are cheap to repair/replace VS. an additional belt and pulley to drive the charger off the crank?

Thanks

Carl Fausett

Those are good points, Larry.

In this case, we are using the AC belt, and the AC compressor is already requiring about 20 HP to operate... so we know the bearings on the AC and the alternator are already designed for that belt load.
We feel that the small supercharger we are using will not add substantially to the belt tension nor bearing load, as the belt tension the AC and alternator require right now are already quite high and high enough for us.

But - if this turns out not to be the case, we will have to make a separate special crank pulley for the 968. I am trying not to do that if I can because of cost and packaging requirements. There is so little room at the nose of the crank and behind the radiator that if I add another belt sheeve, the SC will have to move forward by that amount and then the hood will no longer close.

So, we will try mixing it into the serpantine system first and see what happens.

Kit_Chris

This is very exciting to say the least.

I have trouble even imagining where you can fit the SC, but that's why there are clever developers like you out there. Just out of curiosity, does your current design retain power steering hardware?

Regards,
Chris

Carl Fausett

Yes. The power steering pump and hardware and belt are all unchanged. In the current design, the AC and alternator belt and hardware are also unchanged.

If I get to a spot where a photograph makes sense, I'll post a picture of the setup. That may take me to week's end. Be advised: if I post a partial-installation protoype photo, you will not see the cold air supply or the PCV mods yet.

FRporscheman

For some more clearance at the crank pulley, you could make a slim fan kit for us. Those fans are a ~25 year old design, I'm sure you could make something that works better and takes less space. Just a thought, hoping it doesn't become necessary.

Moook

Or fit a fan in front of the rad instead of behind....But this is only going to drive the costs up.....

H2

Carl already sells a fan so he's got that covered if needed.

H2

Carl Fausett

Supercharger mounted. Now making the idler pulley bracket and mounting that up too. I'll take some pics after those are finished.

Rich Sandor

Out of curiousity, are you leaving enough space for a strut tower brace to be installed with the s/c installed?

Carl Fausett

Show me a picture of the strut tower brace you are thinking of, and I can
tell you if we are mounting anything in the way of it or not.

PennyWise

This has to the most exciting thread in a long time.... I want this to work so badly. I better start spoiling my wife to justify the 'routine maintenance'

Rich Sandor

This is the KLA strut brace, it fits the 968 as well as the 951. There are others that look different but mount pretty much exactly the same. If the supercharger is mounted anywhere within the 1/2" that the strut bar occupies, it won't be compatible.



I'm looking forward to your kit. I'm definately interested, if I buy it, I would be keeping my 968 forever.

Carl Fausett

I dont see a problem. No interference at all. Everything I am doing (so far) is in front of the motor and down.

I have the 968 shop manuals, and we are looking for a good schematic of the crankcase ventilation system. I think the page must be missing from my book set - anybody got a page number for me or a good copy?

When we supercharge a car that has never been boosted, we always need to address the crankcase venting and usually re-route it.

Rich Sandor

I'm not sure that the 968 shop manual has crankcase venting specs in it, but i'll check when I get home. (I have it on PDF complete)