Early 911: Replacing Throttle Linkage with Morse Cable?

[TargaFlorio]

Hi guys,

has anyone here replaced their throttle linkage with a morse cable?
Seems like it might be an easy fix since there are virtually no moving parts on a morse cable...

I did a search here but couldn't come up with anything.

Cheers,
n.
_
http://nicolashunziker.com

[RPMClassic]

When you find out - post the info here. Alot of people have asked about this and no one has posted their finished efforts. Lets see some pics!!

[TargaFlorio]

I've just been thinking about it, I've used morse cable on different cars but couldn't find any info here... if I make the conversion I'll post some pics.

Cheers,
n.
_
http://nicolashunziker.com

[TargaFlorio]

Hi guys,

well I did it, replaced the entire throttle linkage with a 7ft morse cable.

I had a bit of a sticky throttle and had some trouble getting that last "inch" out of the pedal travel.

It works great now, much more accurate and more responsive.

Below are two images. The first one is the original complete throttle linkage.

In the second image, all the parts that are missing have been replaced by a 7ft morse cable. I routed the cable in the same location as where the throttle linkage used to be.




Cheers,
n.
_
http://nicolashunziker.com

[randywebb]

very trick

[911pcars]

Did you fabricate a stop/holder for the sheath or does the whole cable float as shown?

Sherwood

[Jeroen]

can you post some more details
(like where you got the cable)
I never heard of it, but it sure sounds good

[911 tweaks]

PLEASE!!! please post pictures of the engine bay where it connects to the throttle. I can't believe that you got it to bend as needed. On boats it is a b*&^h to get it to do a sweeping 45 degree and I cant believe you did it AND got it attached, somehow, to the throttle. I will hold my congrats till' I see it. This is also needed by me but I thought it would wear out from the "automotive" use which is almost constantlly moving the throttle. On a boat you mostly set the speed and hold onto it and change way less frequently vs. car. I hope I can say you are BRILLIANT but I need proof.
Thanks, Bob

[RPMClassic]

many of the 911's at Sebring and in HSR run this set up - and the bracket that is needed at the rear of the intake manifold is homemade and different on each one! We have a millport and lathe at the shop - so if someone comes up with a design that we all agree on, I can have the bracket made in billet and tig weld up some type of alloy bracket. Keep us posted.

[}{arlequin]

also interested in seeing some pics of the setup. sounds like a good project (could also be used as 'backup' system on a long roadtrip)

[1972_911T]

Im in the process of doing this also as the 964 tranny im fitting to the car doesnt have the bell crank fot the throttle linkage. The best thing to use to do this is the 964 throttle cable, you need to shorten the outer sheath a little but other than this its the right length and has the correct ends for the fittings needed.

Steve

[rexav8r]

(subscribing)

I'm very interested in this as well. Never really an issue before this weekend.

We just had a big DE at Mid-Ohio and coming out of the keyhole, I pressed down on the pedal and "pop", the socket popped off the ball back by the transmission below the engine. Engine just went to a nice purring idle & I coasted safely off track. Never really thought about it before that, but I think a more secure fitting could be in order there.

Not sure if morse cable would correct the connection/fitting issue, but it might offer some alternative ideas.

[TargaFlorio]

Hi guys,

I'll post some pics tonight when I get home.

The installation is really quite simple. Morse cables are great, I think they were developed for aircraft applications (to control rudders, flaps etc.)
I doubt that a morse cable wouldn't hold up as a throttle cable.

In terms of the bending the cable, there are different thicknesses out there. Bending it 45 degrees wasn't a big deal but I've heard that people have run into problems when they tried to bend 90 degree angles.

Attached is a clamp that is used to hold the cable in place. Morse cables are designed that if you secure it at one end the cable will work. So if you move one end the other end has to move (since the cable isn't going anywhere)

You get can morse cables online from most aircraft part supliers or marine supply stores. Lots of Aircooled VW parts stores carry them too.

I got mine from my local Aircooled VW Buggy store for $30.

I think they come in metric and standard, I got a metric (M5) so I could screw it into the existing linkage to use the original ball joint connectors that attach to the carb linkage and throttle pedal.



Cheers,
n.
_
http://nicolashunziker.com

[TargaFlorio]

Just in case, here's what a morse cable looks like.
It's basically a tube that has a cable on the inside.



Cheers,
n.
_
http://nicolashunziker.com

[TargaFlorio]

Hi guys,

took some pictures for those of you who requested them.
The first one shows how the morse cable connects to the original throttle linkage (M5 coupling nut).

The second picture is how the morse cable connects to the carb linkage. I used the original ball joint connector (also M5)





Cheers,
n.
_
http://nicolashunziker.com

[2.7RACER]

Cable is fine for the clutch with it's heavy loads. The big springs make it work.
For the throttle too much risk of drag. Might work fine for awhile.
When the dirt gets inside and it gets cold it just won't work as well as new.
Fine for a race car that is torn down often. Not for a street car.
The Porsche engineers knew what they were doing with the throttle linkage.

[RPMClassic]

The HSR guys were bypassing the bellcrank bushing alll together and running the morse cable directly to the carb drop link up front. This requires a bracket to support cable after it enters into engine bay. These cables are widely used in other industries, there is no reason ( IMO ) that when properly installed that they would be dynomite in this application. Most POrsche owners don't have their throttle working 100% anyway, and they don't even know it. Unless you replace eveny bushing and remove linkage for cleaning and measuring - we are all leaving lost power on the workbench. Great pictures. Who else is going to try this?

[911pcars]

Mechanical throttle linkage was replaced many years ago. Most every modern vehicle in the past x years uses a cable to control the throttle. That is unless it was equipped with an electric wire to the throttle control mechanism.

I don't see any downside with a cable and see many advantages. No. 1 advantage is less friction, and the cable ends wouldn't be exposed to road debris any more than cars factory-equipped with a cable; maybe less so since the engine is in the rear.

I'll put it on my list of things-to-do (although the list is long).

Sherwood

[}{arlequin]

Originally posted by TargaFlorio
Hi guys,

took some pictures for those of you who requested them.
The first one shows how the morse cable connects to the original throttle linkage (M5 coupling nut).

The second picture is how the morse cable connects to the carb linkage. I used the original ball joint connector (also M5)





Cheers,
n.
_
http://nicolashunziker.com

so exactly how long does the cable have to be to fit in there just like this?

this is a great description by the way... not sure whether i'll make the leap "just to do it" but it seems like a good thing to have in your trunk as spares in case something happens on the road. very nice.

[TargaFlorio]

Dave,

on my car I used a 7 (seven) foot morse cable. However, my car is a SWB 1968 model.

There are tons of attachments, (clevis type, coupling nuts etc.) that screw right in the threaded rod of the morse cable so adjustments can be made to be quite precise.

Cheers,
n.
_
http://nicolashunziker.com