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Join Date: Mar 2005
Location: Carnation, Wa
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Turnkey solution on limitted funds

Hello,

I have an 80 SC with a gear box built to the suggested spec on Steve's website but with a slightly taller 2nd gear. The motor has SSI's and a Monty. At Pacific Raceway's today the car was RPM limited going through turn one. On the way home the motor ceased functioning...

Most likely not a big deal... but if it were time to replace the motor... what would be the options and approximate prices?

Things I would like to have:
1. More torque
2. More power
3. More revs


Thanks,
Matt
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Matt West
1980 911 SC
Old 04-30-2007, 08:04 PM
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Is the motor currently stock? and what rpm were you running it at entering turn 1?

Cheers
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Old 04-30-2007, 08:20 PM
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The motor is stock and it was about 300 rpm short of the orange area on the tach.
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Matt West
1980 911 SC
Old 04-30-2007, 08:26 PM
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Put carbs on your motor for all the things you asked for. You description of the malfunction is very nebulous. Did it make expensive noises or just shut off?

-Andy
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Old 04-30-2007, 09:18 PM
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No expensive noises or bad lights. Honestly it seems like a massive vacuum leak. Car began by idling low and rough, this condition deteriorated to miss fires with backfires. I pulled the airbox cover and poked around in the bay, but didn't see the obvious. I will recheck this morning.

The carb delima is that 40's while ideal for this motor seem to be on the small size if I were to go 3.2; while ITB seems a hard value proposition.
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Matt West
1980 911 SC
Old 05-01-2007, 05:46 AM
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Hey Matt,
I'm in Everett and am thinking about putting carbs on my 79 SC.
PM me if you want to get together.
I'll be keeping an eye on this thread!
Eric
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Old 05-01-2007, 06:22 AM
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There is nothing wrong with running your engine right up to redline. The redline is there to warn you not to go past it. If you couldn't run up to it, Porsche would have set it lower.

However if you went substantially PAST it, you could have a problem. Your description is pretty vague but I doubt you've blown anything from running the engine hard, they're built to do that.

Could be as simple as a malfunctioning distributor or as nasty as a skipped timing chain and bent valves. I'd start with a compression and leakdown test. This should eliminate the expensive stuff and ease your mind, then you can work out a diagnosis from there.
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Old 05-01-2007, 07:06 AM
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So diagnosis is a busted rotor caused by a worn distributor.

New cap and rotor are on the car as a bandaid solution, but longer term I need to think about my ignition alternatives.

Part numbers are:

Porsche 930 602 0 21 06
Bosch 02 37 304 016

So immediate thoughts of crankfire, rebuilt dizzy, 12 plugs , etc...

What would you do when confronted with this scenario?

Discuss
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Old 05-01-2007, 08:37 AM
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"if turn-key solutions on limited funds" is a true premis here, than you already know your answer:
replace cap, rotor, rebuild dizzy and keep stk.
IF I WAS YOU, good time for tune-up on top of doing the just said...spark plugs, spark plug wires, oil & filt change, check timing, adj valves.
THEN, drive it like you stole it to see how it runs!

Bob
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Old 05-01-2007, 08:55 AM
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Who rebuilds dizzy's?
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Old 05-01-2007, 09:02 AM
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Up your way I would call John Walker or Steve Weiner.
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Old 05-01-2007, 09:32 AM
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Quote:
Originally posted by Matt_West
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There are several days worth of reading in the archives on these topics...
Old 05-02-2007, 05:27 AM
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