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New Race Car to Us, Need Some Advice :)
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924RACR  



Joined: 29 Jul 2001
Posts: 8546
Location: Royal Oak, MI, USA

PostPosted: Thu Nov 11, 2021 11:03 pm    Post subject: Reply with quote

Correct; one is signal from the Hall effect sensor, the other is the shielded ground for the co-ax wire.

Not sure how best to connect to an MSD, though.
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Vaughan Scott
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'79 924 #77 ITB racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype
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MikeJinCO  



Joined: 08 Jun 2010
Posts: 1116
Location: Maysville, Colorado

PostPosted: Fri Nov 12, 2021 12:13 am    Post subject: Reply with quote

Gone for a couple of days, I'll get the get the diagram for the MSD when I get back.
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Mike
Poco a Poco, #033 '78 Vintage racer, SCCA Dp-81
'77 924
cricketdesigns.com
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ChrisCXC  



Joined: 18 Oct 2019
Posts: 17
Location: Los Angeles, CA

PostPosted: Fri Nov 12, 2021 7:06 am    Post subject: Reply with quote

924RACR wrote:
Correct; one is signal from the Hall effect sensor, the other is the shielded ground for the co-ax wire.


Interesting. I think I missed that ground. I will fix that!
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ChrisCXC  



Joined: 18 Oct 2019
Posts: 17
Location: Los Angeles, CA

PostPosted: Fri Nov 12, 2021 7:12 am    Post subject: Reply with quote

MikeJinCO wrote:
Gone for a couple of days, I'll get the get the diagram for the MSD when I get back.


Awesome, thanks! I've been using the MSD diagram, but I wasn't sure what type of distributor I'm using.

Here is the instruction book: https://documents.holley.com/6425.pdf

I assumed it was a Points/Amplifier Style Ignition. Thus my my white wire is going to that center wire from the coax cable on the distributor.

I then figured my red wire was going to the "Z" terminal on my cutoff switch (where the ignition coil is on the diagram for the switch):

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MikeJinCO  



Joined: 08 Jun 2010
Posts: 1116
Location: Maysville, Colorado

PostPosted: Sat Nov 13, 2021 5:10 am    Post subject: Reply with quote

MSD Wiring:

Heavy Red to battery positive.

Heavy Black to Ground.

Orange to positive on Coil

Black to negative on coil

Violet(purple) to Positive on distributor-

Green to negative on distributor.

White wire NOT used.

I don't think there is any actual polarity in our distributor, but mine are wired, PIN toward FRONT purple, Pin toward BACK green.

If you are using the stock tachometer the is something needed to make it work right. Someone else will have to chime in on that.

Hoe this helps
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Mike
Poco a Poco, #033 '78 Vintage racer, SCCA Dp-81
'77 924
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ChrisCXC  



Joined: 18 Oct 2019
Posts: 17
Location: Los Angeles, CA

PostPosted: Sat Nov 13, 2021 9:36 am    Post subject: Reply with quote

OK, perfect. Thanks!
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ChrisCXC  



Joined: 18 Oct 2019
Posts: 17
Location: Los Angeles, CA

PostPosted: Thu Dec 02, 2021 4:34 am    Post subject: Reply with quote

Where do you guys get your clutch parts from?

Any recommendations on what we should use?
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924RACR  



Joined: 29 Jul 2001
Posts: 8546
Location: Royal Oak, MI, USA

PostPosted: Thu Dec 02, 2021 9:35 pm    Post subject: Reply with quote

Been a while since I bought one, but we're using stock Sachs. Heard too many stories about bad aftermarket clutches from other racers... Centerforce comes to mind...
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Vaughan Scott
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'79 924 #77 ITB racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype
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ChrisCXC  



Joined: 18 Oct 2019
Posts: 17
Location: Los Angeles, CA

PostPosted: Fri Dec 03, 2021 2:43 am    Post subject: Reply with quote

Understood, thanks!

We were thinking of using the South Bend Clutch Stage 2 Endurance kit.




Any thoughts on a flywheel? Ours is missing teeth.....
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MikeJinCO  



Joined: 08 Jun 2010
Posts: 1116
Location: Maysville, Colorado

PostPosted: Fri Dec 03, 2021 4:49 am    Post subject: Reply with quote

I'm building a higher power NA motor so I quizzed morghen about the clutch he is using with his supercharged car. He said that the stock Sachs has been working well. Not knowing the cost of the South Bend unit I wouldn't spend extra to get it.
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Mike
Poco a Poco, #033 '78 Vintage racer, SCCA Dp-81
'77 924
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MikeJinCO  



Joined: 08 Jun 2010
Posts: 1116
Location: Maysville, Colorado

PostPosted: Fri Dec 03, 2021 4:53 am    Post subject: Reply with quote

I remember years back Raceboy kept a stock clutch in his turbocharged NA also.
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Mike
Poco a Poco, #033 '78 Vintage racer, SCCA Dp-81
'77 924
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Fifty50Plus  



Joined: 28 Feb 2008
Posts: 1223
Location: Washington DC area

PostPosted: Fri Dec 03, 2021 11:27 am    Post subject: Reply with quote

I've been running stock clutch discs in all my Porsche, BMW and Benz race cars for over 40 years. Never had any of the problems my competitors did with their fancy clutch packages.
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1982 924 NA race car - Sold
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ChrisCXC  



Joined: 18 Oct 2019
Posts: 17
Location: Los Angeles, CA

PostPosted: Tue Dec 07, 2021 2:26 am    Post subject: Reply with quote

Great info guys, thanks.

Where do you guys like to get your stock clutches and flywheels from? Pelican (our normal supplier) seems to be out of stock.
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