924Board.org

MikeDanger · Joined: 21 Nov 2002 Posts: 774 Location: Denver

why cant we adapt one of these for the 924?

http://youtu.be/YjIKUrre4FQ

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fiat22turbo · Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR

Nothing new, there was one available for VW/Audi engines back in the day from a company called Franco:

http://www.924board.org/viewtopic.php?t=25531

http://www.924board.org/viewtopic.php?t=8846

http://www.924board.org/viewtopic.php?t=3294

http://www.924board.org/viewtopic.php?t=35547

http://www.924board.org/viewtopic.php?t=2578

The drawback is the stock ignition distributor is driven by the camshaft, so the Franco gear not only changed the cam timing, but the distributor timing which may not be ideal. You can have the stock distirbutor advance re-curved, but moving to a distributorless or a computer controlled distrbutor system would be ideal. As it would allow you to maintain control of the ignition timing separate of the cam timing.

I used the Franco gear I have on my low compression 79 engine with the Integral Stage 2 cam and 45mm ITB's (too big!) and it made a noticeable difference in the torque curve (as it now has one below 3500rpm) and it pulls all the way to 7000rpm. I think with a turbo this little motor would be a lot of fun with the other bolt-ons I've already added.

The thing about the Franco gear that everyone focuses on is the horsepower gains, which is wrong. That isn't the gain it provides, the gain is in the amount of area under the power curve. The larger the area, the faster the car will ultimately be.

Ultimately, the Franco gear was too expensive for the gains, but if you find one for under the cost of a new camshaft, then I'd say it is worth it. With modern short-run manufacturing methods, I could see being able to make these at a more reasonable price point.
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1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

GeorgeV · Posted: Sun Apr 27, 2014 9:08 pm Post subject:

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

MikeDanger · Joined: 21 Nov 2002 Posts: 774 Location: Denver

Well, I WILL make one, and I can assure you it wont cost more than $300.

As i have looked high and low, theres always a lot of talk of people saying hey were "looking into" getting some made" and no one ever does. Just BS.

I Will do it, as I always do.

I design CNC parts, and have a large number of resources.
These can be made in production for under $200. they arent that complicated. In Fact I have already made few improvements.

I dont have a Franco gear In hand,( would be nice or atleast some detailed pics) but thats not that big of a deal. Some times its better that way, as long the designer gets the concept, some times starting with a blank sheet, can come out with a better products.

Im not really interested in making stuff for sale but if there are some others interested I could probably get them made in the +/- $200 range if I did 6 or more
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tyfighter123 · Joined: 19 Jan 2010 Posts: 551 Location: Colorado

I will be in for one if you can get them made.
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Porsche 924 1977 N/A
Mustang GT/CS 2007
Porsche 924S 1987 (parts car)(cut up and recycled)
Porsche 911S 1976
Porsche 931 1980
Porsche 931 1980 (parts car)

GeorgeV · Posted: Wed Apr 30, 2014 12:24 pm Post subject:

Eturbo924 · Joined: 09 Nov 2002 Posts: 2212 Location: Londonderry NH

Get some protos made and dyno a car with one on it. Then with some concrete numbers behind it I am sure you would have many lining up to buy one.
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Shurick · Joined: 15 May 2005 Posts: 524 Location: Russia, Moscow.

I will buy one for sure.

By the way, Franco gears for turbo and N/A engines had different advance/retard. If I remember right the gear designed for turbo had advance only with no retard @ high revs.
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fiat22turbo · Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR

There are two settings on the gear. One is for -3/+7 or 0/+10 depending on which keyway you chose.

The "crossover" and rate of timing change point could also be tuned by changing the springs use inside the device, much like recurving a mechanical distributor.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

morghen · Joined: 21 Jan 2005 Posts: 9095 Location: Romania

When will it be available for purchase?
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tyfighter123 · Joined: 19 Jan 2010 Posts: 551 Location: Colorado

Hey Mike, did you ever get these made like you said you would? I am ready to buy one when you have them.

Tyler
_________________
Porsche 924 1977 N/A
Mustang GT/CS 2007
Porsche 924S 1987 (parts car)(cut up and recycled)
Porsche 911S 1976
Porsche 931 1980
Porsche 931 1980 (parts car)

MikeDanger · Joined: 21 Nov 2002 Posts: 774 Location: Denver

Not yet, My mom had a medical emergency and the past 4-5 months I really couldnt spend any time on other projects. Im just getting back in gear. but now im much shorter on cash so, that will probably have some effect. Will keep you guys updated.
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MikeDanger · Joined: 21 Nov 2002 Posts: 774 Location: Denver

Ok im working on finishing the design.
How many are seriously interested? Ive contacted a couple MFGs Need some sort of firm figure to get pricing.

Ill post up a couple base drawings in a bit.
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MikeDanger · Joined: 21 Nov 2002 Posts: 774 Location: Denver

Also can anyone tell me if the "fly weights" are steel or alu in the Franco gear?
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It was either this or a giant box of legos