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.

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?

<img src="http://www.pelicanparts.com/MotorCity/blackfoot/turbo_120%20lighter.jpg">

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.

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.

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.

Fiat pics for Blackfoot
 

This car is a 2000 cc 5 cylinder, 20 valve Turbo charged developing 220 BHP. Year model 1997 http://forums.pelicanparts.com/uploa...ront view1.JPG http://forums.pelicanparts.com/uploa...g to 250 1.JPG http://forums.pelicanparts.com/uploa...tcoupedash.JPG

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

This cars engine is really smooth even with 5 cylinders

I can feel mine running but it is smooth.

Didn't see any trees in the background of your Fiat pix. ;-)

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

Does the 951 have balance shafts?

Yes

of course.. sounds like the belt is not aligned

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.