Clutch pedal raises under hard acceleration

[MrScratch]

anyone experience this?
i noticed when i get the car up to higher revs under hard acceleration, the clutch pedal pushes forward.
i step on it and it goes back down and disengages like normal but im guessing i need that fixed!!?
any ideas?

[yelcab1]

and just what Porsche do you have?

[85RedCarrera]

Is this due to a walking crank - excessive crank end play??

I had the exact same thing happen in my Chevy Stovebolt 261.... probably the furthest thing from a Porsche engine that is still out there!

[Kevin Stewart]

Check your transmission and motor mounts.

[MrScratch]

Originally Posted by yelcab1

and just what Porsche do you have?

i have a 84 3.2 Cab

[MrScratch]

Originally Posted by Kevin Stewart

Check your transmission and motor mounts.

will do
thanks

[MrScratch]

Originally Posted by Kevin Stewart

Check your transmission and motor mounts.

how would that affect it though?
i think the clutch is cable operated and behind the driver..
the pedal pushes out towards you..

[MrScratch]

that's it?
not interesting enough??
lol

[MrScratch]

Originally Posted by yelcab1

and just what Porsche do you have?

84 911 Cab.you were going to add something?

[Kevin Stewart]

Anytime a motor moves ie bad motor mounts etc. it usually will put pressure somewhere else, or your chassis could be flexing.

[pmax]

Did you check the mounts ?

[nickelplated5s]

Physics. If the pedal comes up the throw our bearing is coming forward. Could be mounts could be tranny.

[MrScratch]

Originally Posted by pmax

Did you check the mounts ?

i don't get it though, isn't my pedal cable actuated?
i'll have my mechanic check it out
thanks

[Jeff Higgins]

Originally Posted by MrScratch

i don't get it though, isn't my pedal cable actuated?
i'll have my mechanic check it out
thanks

Yes, your clutch is cable actuated. The problem starts with how the cable housing is attached to the car. At the forward end, the housing is anchored to the body of the car. At the aft end it is anchored to the transmission and engine assembly. That transmission and engine assembly is mounted to the body of the car via four rubber mounts. They are rubber so that they can absorb vibration and not transmit much to the body of the car.

When these rubber mounts wear, they allow for excessive movement between the transmission and engine assembly and the body of the car. With the clutch cable housing spanning the two, it gets alternately stretched and compressed. It's designed to do this all the time, without you noticing, since those rubber mounts will always allow for movement. It's when that movement becomes excessive that you see and feel it in the clutch pedal.

That's why they are telling you to check those engine mounts

[MrScratch]

Originally Posted by Jeff Higgins

Yes, your clutch is cable actuated. The problem starts with how the cable housing is attached to the car. At the forward end, the housing is anchored to the body of the car. At the aft end it is anchored to the transmission and engine assembly. That transmission and engine assembly is mounted to the body of the car via four rubber mounts. They are rubber so that they can absorb vibration and not transmit much to the body of the car.

When these rubber mounts wear, they allow for excessive movement between the transmission and engine assembly and the body of the car. With the clutch cable housing spanning the two, it gets alternately stretched and compressed. It's designed to do this all the time, without you noticing, since those rubber mounts will always allow for movement. It's when that movement becomes excessive that you see and feel it in the clutch pedal.

That's why they are telling you to check those engine mounts

Awesome
thank you for the explanation.
now i know why.
appreciate the knowledge.