924Board.org

griffinbilt · Joined: 23 Nov 2010 Posts: 31 Location: Flora Indiana

Can anyone tell what the A/C voltage is on a good working crank sensor? I am in the process of making sensors. Measure between term# 13 and 14 but it has to be measured in A/C voltage at cranking. need asap! So I can get mine running again. and maybe others.

Thank you Tony Griffin

McGyver · Posted: Fri Sep 13, 2013 1:35 pm Post subject:

Not sure anyone here know the answer... Voltage as I know should be low enough to be amplified in DITC... but once (flywheel 1-st teeth) is much more stronger or higher than normal ones. Most important in good sensor is resistance between connectors (you can find proper values in service manual or here on board).
As I saw sensor should be just two coils in one housing... never had chance to get one bad sensor and take it apart for research so I'm not 100% sure what else could be inside.
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931 82' - 5000km after full engine rebuild

SOLD: 924 81' N/A- with turbo gearbox "dogleg" - great but mysterious car

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ptheskil · Joined: 03 Aug 2004 Posts: 128 Location: Essex, UK

I have never measured this on my 931 so bear that in mind. The CPS on the 931 is a dual VR sensor so on the primary coil the voltage will vary with crank speed. Based on experience with other engines you should be measuring about 1V (maybe less) at crank and up in the 100s of V at high rpm. The secondary coil has fewer turns and therefore only produces a measurable output when the "special" tooth passes it once per crank revolution. In theory it should be possible to wind a couple of coils to do the same job and produce a similar output. Good luck with that and if you are successful then you will find yourself with a lot of new friends.
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1981 931 series2 Euro spec

nwns · Joined: 27 Sep 2008 Posts: 93 Location: Lancashire, UK

We've been taking lots of measurements with a view to finding an alternative over at porsche924.co.uk one of our members has detailed it quite well using an oscilloscope.

Would be good to pool resources, though the parts manager at one of our OPCs has suggested that if we ask enough they will remanufacture non-trim components....
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Pete

ptheskil · Joined: 03 Aug 2004 Posts: 128 Location: Essex, UK

I'd be interested to see some of that data. Any chance of a link to the relevant post? Thanks.
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1981 931 series2 Euro spec

nwns · Joined: 27 Sep 2008 Posts: 93 Location: Lancashire, UK

http://porsche924.co.uk/forum/viewtopic.php?f=47&t=14336&hilit=crank

It's here but it's in a members only section, great club though and we post magazines, etc worldwide for no extra charge.

Ask Mr.P (membership@porsche924.co.uk) for a discount on membership as we're past half way in the year.
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Pete

Carrera RSR · Joined: 08 Jan 2010 Posts: 2312 Location: Somerset, UK

As posted on another thread re NLA bearings, we at the 924 owners club are compiling a NLA list to lobby Porsche and other suppliers to regain some supplies. If we can pool our resources, time, knowledge and contacts we may be able to resolve some deal breakers of NLA parts.

We would welcome any contact and support on this http://www.porsche924.co.uk/forum/viewtopic.php?f=104&t=16778
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252

Ponz · Joined: 10 Jan 2013 Posts: 229 Location: Florida

Strange that this site does not charge to join. Thanks a million John.
I have tried to get on the UK site but why the charge? So if you cannot find it on the UK site look here. I suggest we petition the UK site to let us 924.org site guys enter for free just like the UK guys visit us free.

Thanks again John for all your work on this site.

vince
I think I am having a senior moment.
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77 1/2 track car
79 931 Euro
87 911 Targa

Carrera RSR · Joined: 08 Jan 2010 Posts: 2312 Location: Somerset, UK

Kenodog · Joined: 25 Jun 2003 Posts: 2669 Location: Vancouver,B.C.

So if we here in N. America want to just join the Forum aspect do we get a discount on membership since we quite obviously cannot make the other events that the membership dues help fund ?
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1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140

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

Guys...as far as i know, joining the forum is free.

Some areas of the forum are only available for the club members.
These areas mainly include the technical help section.
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Supercharger and EFI kits
https://www.the924.com

Carrera RSR · Joined: 08 Jan 2010 Posts: 2312 Location: Somerset, UK

Cedric · Joined: 27 Aug 2004 Posts: 2801 Location: Sweden

Ot:

Got an issue of the 924 magazine from felixP when he was on visit here in sweden last weekend. Really nicely made, a magazine full of 924s, wow

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1980 924 Turbo
www.instagram.com/garagecedric/

Carrera RSR · Joined: 08 Jan 2010 Posts: 2312 Location: Somerset, UK

Danblez · Joined: 31 May 2013 Posts: 2 Location: UK