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coupe's Avatar
 
Join Date: Oct 2002
Location: Dubai
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How smooth idleing is an '86 951?

I was sitting in my car with a Porsche workshop service manager a couple of days ago, and I pointed out that my cars still shakes and shuders while idleing even after all the repairs that I have done, including new engine mounts.

So he said that even if a bought a brand new engine, the car would still vibrate in idle and feel rough.

I really just stopped listening to this guy at this point. I thought that this guy doesnt know what he is talking about.

So my question to you all with better cars, How smooth are these cars, especially a 951 made in 1986????

Thanks.
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Porsche 944 Turbo, 1986
Fiat Coupe 20v Turbo, 1997
Old 03-18-2003, 09:03 AM
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well, i have an '86 which britwrench says the motor mounts will soon go bad, yet it idles smoothly. so i think your problem isn't the mounts, unless they were installed incorrectly, which seems unlikely.

fiat pics?

Old 03-18-2003, 09:10 AM
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Mine is smooth when it is warmed up if and only if the AC is off. But what is smooth? It is not as smooth as my 400E V-8. It does not stumble or shudder. It is fairly smooth. Has your flywheel been lightened by any chance? Hard to quantify.
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1986 951
2002 SLK32 AMG
1987 328GTS
2011 528i
Old 03-18-2003, 09:12 AM
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Mine is very smoothe in comparison to other cars, even newer cars. In fact I can't even usually fell the engine running.

But this was not always the case, I had vacuum leaks and a torn J-boot that caused the thing to shudder at idle. I would bet that if you have good compression then there may be another issue.
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Old 03-18-2003, 09:27 AM
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Well, the way I see it is that it is way to rough for a Porsche. As far as I know the car is full stock, with the exception of a free flow exhaust system and the removal of the catalitic converter.
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Porsche 944 Turbo, 1986
Fiat Coupe 20v Turbo, 1997
Old 03-18-2003, 09:27 AM
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Fiat pics for Blackfoot

This car is a 2000 cc 5 cylinder, 20 valve Turbo charged developing 220 BHP. Year model 1997

0-100km/h in 6.5 s
Top speed 250 km/h

This cars engine is really smooth even with 5 cylinders
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Porsche 944 Turbo, 1986
Fiat Coupe 20v Turbo, 1997
Old 03-18-2003, 09:40 AM
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I can feel mine running but it is smooth.

Didn't see any trees in the background of your Fiat pix. ;-)
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1986 951
2002 SLK32 AMG
1987 328GTS
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Old 03-18-2003, 10:10 AM
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It should be fairly smooth. To compare, I put a glass of water on the intake manifold @ idle, and the water did not seem much different vs. a 98 honda v6 in top shape.
Ahmet
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Old 03-18-2003, 10:37 AM
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Does the 951 have balance shafts?
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Old 03-18-2003, 03:56 PM
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Yes
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Old 03-18-2003, 04:28 PM
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of course.. sounds like the belt is not aligned
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Old 03-18-2003, 05:07 PM
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I'm getting the timing belts looked at again this coming saturday, as some of you may know, my new mechanic got them fitted wrong.

I have also ordered a new distributor cap and rotor, and new 8mm ignition wires.

I hope all this will smooth it all out.

I also have to look closer at the after market exhaust system fitted, and may have to renew most of it. I think that one of the problems may be here.
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Porsche 944 Turbo, 1986
Fiat Coupe 20v Turbo, 1997
Old 03-18-2003, 07:05 PM
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