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hwyix

triple Webers linkage ( or convert to throttle linkage ? )

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I recently purchased a 240z with triple Webers. 

The other day when I went to start the car I stepped on the gas pedal a few times to prime it.  The pedal stayed stuck to floor.  Upon investigation looks like the P.O. did a homemade job to shorten the linkage for the Webers.

The brass coupler in the picture with the red arrow is no longer working. If they where not dissimilar metals I would be tempted to just have it welded.

 

Can I buy the correct size throttle linkage for this?

Or I was thinking of converting to a throttle cable. Looking for recommendations on a kit for that.  

linkage-markup.jpg

Edited by hwyix
gramar

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 My first option would be to remove the brass sleeve and butt weld the ends together. It seems likely that a short piece of round bar may be needed to fill an unseen gap. Second choice would be drill and tap the sleeve on both ends. I'd probably put four holes in it. Drill deep enough to dimple the linkage shaft, tap the holes and secure it with set-screws.

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I wonder if that shaft is binding in the mounts because it is so short?

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7 minutes ago, Patcon said:

I wonder if that shaft is binding in the mounts because it is so short?

I am not sure if I fully understand your question.  It does not appear to be too short or binding. From the best I can tell the car probably had twin carbs which means that shaft was longer as reached farther away. They purchased tripple carbs, now the shaft is too long. I am guessing the kit did not include the needed shorter shaft so they shorten it.

 

I was wondering what does everyone else do who who has tripple webbers/mikuni do ?

 

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It's got a good bit of angle to it and it seems like the hook could bind because of that. The longer linkage shaft wouldn't be as susceptible to binding. The offset distance is the same long shaft or short shaft but the angle is worse on the short shaft.

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5 hours ago, hwyix said:

 

I was wondering what does everyone else do who who has tripple webbers/mikuni do ?

 

Each manifold used is a little different than others. My Mikuni manifold uses the full length stock arm.

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17 hours ago, Patcon said:

It's got a good bit of angle to it and it seems like the hook could bind because of that. The longer linkage shaft wouldn't be as susceptible to binding. The offset distance is the same long shaft or short shaft but the angle is worse on the short shaft.

I see. Now that you mention it I could see that.

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14 hours ago, Lumens said:

Each manifold used is a little different than others. My Mikuni manifold uses the full length stock arm.

Thanks for confirming that for me.

 

I am going to see if I can buy stock linkage arm and have it modify correctly.

 

 

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Looks like an adapter was installed on the firewall. Perhaps to line linkage up. Mine is at an angle (not ideal) and need to come up with something like that.

I have extra a shortened link like that I made as an experiment. You can have it if I can find it.

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21 hours ago, Lumens said:

Looks like an adapter was installed on the firewall. Perhaps to line linkage up. Mine is at an angle (not ideal) and need to come up with something like that.

I have extra a shortened link like that I made as an experiment. You can have it if I can find it.

 

I would like that a lot if you could find it. Thanks.

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17 hours ago, grannyknot said:

Lokar has everything you'll need to switch to cable, good quality but pricey, it starts on p.45 and goes on for a few pages.

http://lokar.com/catalog/#page=45

 

Thanks. If I can not get the linkage to work I will try and figure out what I need from that site.  I know I am going to need at least a new pedal, cable, bell crank and some way to mount all this stuff. I tried looking at it yesterday and did not have a good way on how I would convert to throttle cable and get the full range of motion for the carbs.

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I don't really ever use the super heavy duty loctites for anything. If I want it permanent, I do it another way.

For a lokar cable, you can reuse the factory pedal

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For now if it were mine I think I would pull apart and fill with a good epoxy for metal and push back together. Then I would take a hammer 

with a pointed punch and wack that sleeve on each end. I don't think it would twist inside after that.

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