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there are plenty of compact, OEM-type alternators available here with a little bit of leg work available new from our auto supply stores for the equivalent of ~50 GBP.
i do fully agree that the 944 could use an "alternator diet" as the stock unit is an underperforming, oversized monster compared to more modern units.
Originally Posted by 924srr27l
We have a manufacturer in the UK called BRISE who do smaller Alternators....
If anybody wants to give this a shot, my Jaguar XJR "short-snout" M90 is not going to be needed so it is up for sale.
This one is rarer than the Ford version I am using, it is about 2.5" shorter overall so will be easier to package.
Good used condition, ready to bolt on and go (could use a cleaning though).
I need $300 to break even (that's what I paid the dismantler who removed it from the running but wrecked Jaguar)
Interesting thread. While I am not Supercharging a Porsche. I have done a good amount of work on doing the same to Honda 1976 GL1000 Goldwing motorcycle. That project is ‘sorta’ stalled right now, but that is only from my own laziness. I went out to my shop today and looked at all the parts I have collected to date, and my build binder. This thread may help get me back on the road to finishing that project, I really do hope so. I noted a few posters mentioned the Rotrex brand. That is the S/C brand I went with on my project, a C15-60 to be exact. Its sweet ‘spot’ is in the 90 - 240 HP range. I was going for 100 - 125 HP, low RPMs on the actual S/C, so well within its limits. I won’t post any data here, I think that is a little off topic for this thread. However, a book I would highly recommend for anyone wanting to do such a S/C project is ‘Supercharged’ by Corky Bell. I will be following this thread and I may interject if I feel I can add something technical to the conversation.
An idea I had a few years ago was to run the blower off the balance shaft cog. Machine a balance shaft pulley to fit the shaft of the blower. 2:1 cogged ratio, no slip. My car has the balance shafts deleted so it seemed viable in my case.
Interesting thread. While I am not Supercharging a Porsche. I have done a good amount of work on doing the same to Honda 1976 GL1000 Goldwing motorcycle. That project is ‘sorta’ stalled right now, but that is only from my own laziness. I went out to my shop today and looked at all the parts I have collected to date, and my build binder. This thread may help get me back on the road to finishing that project, I really do hope so. I noted a few posters mentioned the Rotrex brand. That is the S/C brand I went with on my project, a C15-60 to be exact. Its sweet ‘spot’ is in the 90 - 240 HP range. I was going for 100 - 125 HP, low RPMs on the actual S/C, so well within its limits. I won’t post any data here, I think that is a little off topic for this thread. However, a book I would highly recommend for anyone wanting to do such a S/C project is ‘Supercharged’ by Corky Bell. I will be following this thread and I may interject if I feel I can add something technical to the conversation.
Here is my friend Harald`s ch550sc
Running microsquirt ++++
Here is my friend Harald`s ch550sc
Running microsquirt ++++
That is cool, a very nice job of mounting and plumbing.
If I can find some old pics I will post how the Rotrex S/C is being mounted on a Flat-Four GL1000. I am runing, or will be, Jenvey Injector Throttle Bodies. Then come out of the UK and are a TB replacement for Webber Carbs. I think they go 2-Bar+ in the specs, but my boost is planned to be way less than that.
Looking into intercooling options. Looking at these a2w barrel units. Seems appealing to me from the space saving and possibly simpler air ducting. The water loop part doesn't bother me. For the power and boost I am looking for these compact units might work. Any comments on this approach?
Pictures is 4" diameter total length around 11". From frozenboost.com I think I could fab this to fit in the space that the j-boot and throttle body now occupy.
When you go to start fabbing stuff up you'll realize how little space there really is under a 944 hood.
I've looked long and hard at those AWICs, barrel types, the boxy types, even thought about making my own. It'd package so much better without all the air piping.
But those things sure seem bigger than they really are when you try to stuff them into a car..
I think you could fit one of those if you designed the entire system around fitting it, if that makes sense.
When you go to start fabbing stuff up you'll realize how little space there really is under a 944 hood.
I've looked long and hard at those AWICs, barrel types, the boxy types, even thought about making my own. It'd package so much better without all the air piping.
But those things sure seem bigger than they really are when you try to stuff them into a car..
I think you could fit one of those if you designed the entire system around fitting it, if that makes sense.
You can use a BMW Water IC. ( 13717575406/405 )
Water cooler where the oem ic is placed.
12-13-2017, 07:04 AM
