924Board.org

Rattlinbone · Joined: 21 Jun 2009 Posts: 265 Location: Seattle, WA

What does the KP/cm2 dial indicate? Sometimes the needle points low, like 2 or 4, and sometimes it reads high, like 6 or 8. So, what is that? What is it trying to tell me?
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Fred- 1979 924

Rattlinbone · Joined: 21 Jun 2009 Posts: 265 Location: Seattle, WA

Use the search button, douschebag!

http://www.924board.org/viewtopic.php?t=16777&highlight=cm2
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Fred- 1979 924

Rattlinbone · Joined: 21 Jun 2009 Posts: 265 Location: Seattle, WA

Yeah, but that doesn't really tell me what it's trying to tell me about the operating of my engine. More info, please.
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Fred- 1979 924

Rattlinbone · Joined: 21 Jun 2009 Posts: 265 Location: Seattle, WA

Okay, it seems that it has something to do with oil pressure. I thought maybe it might be vacuum pressure, but I suppose not. So, if it is oil pressure, then what numbers the needle is pointing at seem to have something to do with the rpms the engine is running at. Is that right? And if so, what does 2 mean compared to, say, 8, and what would be a reading I would in general be happy to see?

I hear VDO is a good instrument maker. What do you think?
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Fred- 1979 924

Rattlinbone · Joined: 21 Jun 2009 Posts: 265 Location: Seattle, WA

Sure enough, it's an oil pressure gauge.

I found that pic at Ideola's garage. Apparently he sells them.

Now I need to learn more about what it's reading indicate.
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Fred- 1979 924

Rattlinbone · Joined: 21 Jun 2009 Posts: 265 Location: Seattle, WA

http://www.924board.org/viewtopic.php?t=32806&highlight=oil+pressure+correct

Hmm. Does this apply to my '79 924n/a? 2 bar at normal idle, 5 or 6 when giving it the gas. Rule of thumb 1 bar per 1000 rpm. That seems a bit off to me, but it does give me an idea of what I'm looking at there.
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Fred- 1979 924

Rattlinbone · Joined: 21 Jun 2009 Posts: 265 Location: Seattle, WA

Well, it seems I answered my own question, but if any of you smart guy mechanic engineers have anything more to say about oil pressure and what a driver ought to be looking for/expecting, then please speak up.

For quite a while, I thought it might have something to do with vacuum pressure. Is there a vacuum pressure monitor indicator gauge? Stock or after market? Useful or BS? Clearly i don't know what I'm talking about!
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Fred- 1979 924

Rattlinbone · Joined: 21 Jun 2009 Posts: 265 Location: Seattle, WA

Seems some of you folks like the idea of replacing the clock with a vacuum gauge.

http://www.924board.org/viewtopic.php?t=35287&highlight=vacuum+pressure

Monitoring it may give you advance warning of inpending problems.
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Fred- 1979 924

Rattlinbone · Joined: 21 Jun 2009 Posts: 265 Location: Seattle, WA

Hey, look at this!

Looks like Summit Racing will sell you a VDO-made vacuum gauge. At least it would matchy match the other instruments.
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Fred- 1979 924

Rattlinbone · Joined: 21 Jun 2009 Posts: 265 Location: Seattle, WA

And that is how I spent an hour of my time this warm Thursday evening. Asking dumb questions and answering them myself.
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Fred- 1979 924

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

You were on a roll, so I didn't want to interrupt

Yeah, VDO makes different gauges and a vacuum gauge is pretty handy to have instead of a clock.

Another option is to install an oil temperature gauge, but that requires adding a sender in the oil pan.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

Rattlinbone · Joined: 21 Jun 2009 Posts: 265 Location: Seattle, WA

Hey! It was fun, actually!

As far as putting in the oil temp gauge, I read that that adding a sender is easy. There's a hole, currently containing a bolt, I think, not far above the drain plug. Just take the bolt out and insert an appropriately-sized sender unit in that hole, right? On the face of it, it seems a little easier than installing a vacuum sensor, if only because I don't know where/how to connect such a device. But then, I'd wager that I would get decent instructions from the instrument maker.
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Fred- 1979 924

Grenadiers · Posted: Fri Aug 05, 2011 9:03 pm Post subject:

DOCO · Posted: Fri Aug 05, 2011 10:28 pm Post subject:

ROTFL!!!
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Doco "where am i going and why am i in this handbasket"author unknown
79 924 N/A "Webster"
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"WEBB STR"

Jakkq · Joined: 29 Sep 2008 Posts: 810 Location: Omaha, Nebraska

Hahahahahahahahahahahahahhahahahahaha!!!!!

Wait please tell me you knew that was a clock. I almost pissed myself. Im pretty sure it was meant to be a joke. If not, I'm going to feel like a dick.

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1979 Porsche 924- Snailshell
http://porsche924workblog.blogspot.com/