924Board.org

[DemosT]

On my relentless quest to quiet down my 1983 2.0 NA, i returned to the one issue i suspected since day one of owning this car. The damned engine mounts.

What i am facing is an intense vibration i feel through the gearshift lever and clutch pedal when at 3000 rpm, which subsides from the shift lever upon reaching 3400ish rpm.

At 2000-2200 rpm I also hear a distinct rapid metallic sound, similar to a buzzsaw cutting through metal which also makes me suspect the exhaust is moving in a certain way aswell, though i don't know if that can be traced back to the bad engine mounts.
And during a trip from Italy to the Netherlands the exhaust broke away from the manifold right as i crossed into germany during a stop-and-go traffic jam. I blame the vibrations and jolts. Got it fixed there with a clamp-down tube thing i don't know the name of, but that so far is holding just dandy. I also replaced the muffler mounts far in back, but that didnt have all too much effect.

Some time ago i ordered a pair of Vibratechnics Fast Road engine mounts (which are really the only new mounts for sale anywhere for the 2.0) for a rather obscene sum of money, to later find out that these absolutely SUCK vibration wise and are simply way too stiff.
I know of one website selling an OEM (or what looks like it) right-hand engine mount (the one with the spring that often breaks) but for an even more obscene price.

My questions now: has anyone here tried to somehow fit the engine mounts of a 944 or 924S for the 2.0 engine?
Has anyone bothered with also replacing the transaxle mounts? If so, can you still buy them from somewhere?
Has anyone tried modifying the Vibra Technics mounts (as you can actually take them apart fairly easily and ideally swap out the rubber part for something softer and thicker)
Should i just replace the spring in the right hand mount which is probably broken and have that fix most issues?

This entire thing is kind of driving me up the wall

[924RACR]

Interesting idea of retrofitting the 2.5L mounts... I'd be down to try if I could get my hands on a pair.

On the other end of the spectrum, this would seem a perfect topic to harass Porsche with, to get new ones made through the Porsche Classic program...
https://forms.porsche.com/en/classic-notesonavailability/

RH mount number is 477 199 303
LH mount number is 477 199 301 for NA, 301 A for Turbo/GT
_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

[DemosT]

[Harm]

[safe]

I replaced the broken spring in mine and that made a world of difference.
_________________
/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe

[Project-924-1979]

Hybridflex engine mounts. Good price and as far as I've heard good quality. You can choose the stiffness yourself, just send them an email.

https://hybridflex.rs/kontakt/
_________________
Restoring a late 1979 Porsche 924. This is my first car and my first attempt at restoring a car.
Learning a lot along the way and doing as much as I can myself.

[DemosT]

[Project-924-1979]

I remember €80 per enginemount. You just get the rubber and need to reuse the steel bracket.
_________________
Restoring a late 1979 Porsche 924. This is my first car and my first attempt at restoring a car.
Learning a lot along the way and doing as much as I can myself.

[safe]

[pierro]

I'am about to replace the vibratic ones by the originals from Porsche and looking for a "how to" tor replace them without removing the complete engine.
Is there a little procedure to replace, i've seen that the left side is not to bad to access, but he rightside where the exhaust downpipe is obstructing the acces is making it difficult.
Hopefully someone is having this done before and able to help me out.
_________________
Porsche 924 1983restored
MG-Midget 1974 restored
Citroen 2CV 1986 restored
Rover Mini 1275 1992 restored
Mazda MX-5 1.8 for the fun
Toyota Lancruiser Prado daily driver
Merceds Benz W124 230E for the quality

[924RACR]

So with long enough extensions, reaching the nuts on the top and bottom is entirely do-able... for either side... at least from my experience/memory. Loosen both sides at the same time, with a floor jack under the oil pan, and you should be able to lower the motor enough to slip both sides out...
_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

[Raize]

[DemosT]

Managed to do it.
Bought two OEM-replica mounts made by Hamburg Technic and managed to do the job over about three days.

Worst part was taking the starter heat shield off and breaking the top bolt from the passenger side (hot side) mount's arm.

As expected the passenger side mount's spring was completely done for.

No noticeable improvements on vibrations, noise or general ride quality whatsoever.

[Raize]

Unfortunate result.

This reminds me, I had a similar issue once. It turned out that the internal perforated tube of the final silencer had broken its welds / corroded and become detached at one end so while there was no external obvious problem, it was making very annoying noises like you describe. This was really hard to diagnose tbh. I'm not saying this is what the problem is but just that it can be very random things to cause such noises and vibrations.

I'd recommend you get the car on lift or over a pit then just get someone to rev it in neutral at the problem rev ranges and push and pull on stuff (with a glove) until you find what stops the noises.