Throttle Linkage Confusion...

[2002Scoob]

Soooo, I'm mocking up the carbs and linkage this evening, and I'm stumped. It looks as thou Ireland might have sent me the wrong kit as the linkage brackets that mount to the carbs have the idle adjustment tabs facing the wrong way to mount them to the rear-side of the carbs.

They mate up perfectly to the front-side, but then the actuation rod isn't long enough to reach the front of the forward carb and the accelerator rod at the rear.

Can somebody confirm, deny, or at least join me in my moment of duuuhhhrr?

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[2002Scoob]

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[2002Scoob]

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[2002Scoob]

Effit. Bent those SOB's back the other way. Hopefully I didn't fatigue em too much. Waiting to hear back from Ireland Engineering hopefully they send the proper tabs.

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[2002Scoob]

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[MildSeven]

I ordered that same linkage kit (but not from IE).

I looked in to buying throttle brackets with the tab on the other side (the proper side), but I think they were like $11 a piece or something and being the cheap SOB that I am... I did the same as you.

 

The motor still isn't back in yet, what's your plan for a throttle return spring?

 

PS: I'm digging the wrinkle look.

[2002Scoob]

Glad (i think?) to hear someone else had this  issue, and used the same solution. Kinda a bummer to have to hammer and bend up such an expensive kit of hardware. I called and talked to Jeff, but he didn't seem very aware of the issue, or the fix.Sent him photos, and I'm waiting to hear back. 

 

Plan for the return spring is to re-use the old one from the stock solex, and hook it to the arm that connects to the accelerator rod, and then somewhere to the body. I'm not convinced it's 100% necessary. The carbs have their internal springs (new in the rebuild) I can't imagine the possibility that both fail, but I guess a backup of a backup of a backup is safer.

[nbcbird]

Check out the linkages at Pierce Manifold using a ball joints.  I have the exact set-up and I think part of your problem is that your adjustable links are far too long from the rod lever to the carb lever.  

[Simeon]

Are the carb linkages supposed to have a downward angle?

 

Flip them around and swap them over ( I think?!). Would work better with your 'long' ball jointed linkages as well. 

[2002Scoob]

Are the carb linkages supposed to have a downward angle?

 

Flip them around and swap them over ( I think?!). Would work better with your 'long' ball jointed linkages as well. 

Hi Sim,

Was this directed towards me or the guy above? The carb linkages are angled upwards.

Im also confused as to the comments about too long of linkages?

From what I gather it seems as though it's standard fare to have to do the bent tab with the rod kit from I.E., but I did hear back from Jeff there and he mentioned he contacted his rep about appropriate linkages as well.

After bending the tabs over and tightening everything down it feels pretty dialed. At least enough to bolt on and start tuning. I did have to modify the linkage to the accelerator rod by drilling it out slightly so it works with the stock clip feature

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[TobyB]

I may be missing something, but couldn't you just use that throttle shaft lever on the other carb?  Then the stop would hit where you wanted...

 

I guess the part I'm missing- what connects to the other carb?  Most of 'em can be 'throttled' from either side.

 

And:

with DCOE's- an 'overcenter' linkage helps give you better modulation off- idle.  So as the IE kit does, it's pretty common

to have the driving arm very 'high' so that a relatively large rotational movement of the intermediate (driving) shaft results in much less

movement of the carb (driven) shaft.  Then as you add throttle, the opening rate gets progressively higher.

Reason being, the opening/useful power ratio's not linear- those first few mm's of opening make a huge change

in engine torque output, and the last few mm's are almost un- noticable.

Even on the race car, I found I had much better throttle control when I set it up that way, and I ended up using

a much lower motion ratio (shorter driving arm) than the Ireland kit, AND made the throttle- to- intermediate

shaft linkage 'progressive' that way, too.  It really helped.

 

Lots of cars, from the E21 on, do that in their throttle linkages- the M42 even has a small 'primary' that you use for

almost everything except brisk acceleration.

 

fwiw,

t

 

[2002Scoob]

Always good insight.

Are you saying mount the carb linkages to the forward side of the carb? This could work, but the mounting rod isn't long enough to hang off the back of the motor to then attach to the accelerator rod. I also got some insight that perhaps only one of the idle adjustments is needed, which makes some sense.

I'll do some fiddling, perhaps removing one tab and leaving the other bent to interface with a single adjustment screw is enough.

I may be missing something, but couldn't you just use that throttle shaft lever on the other carb?  Then the stop would hit where you wanted...

 

I guess the part I'm missing- what connects to the other carb?  Most of 'em can be 'throttled' from either side.

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[2002Scoob]

Here you can see the arrangement I ended up with, it's the only feasible layout I come to with the kit.

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[eurotrash]

Looks good.  But heads up.. the nylon in ball ends will bind.  Mine did..  a couple of us went to quick release, all metal ball joints similar to the ones NCbird posted.. great for removing the linkage, syncing, and then adjusting the linkage to suit the settings. 

 

[2002Scoob]

Looks good.  But heads up.. the nylon in ball ends will bind.  Mine did..  a couple of us went to quick release, all metal ball joints similar to the ones NCbird posted.. great for removing the linkage, syncing, and then adjusting the linkage to suit the settings. 

 

Thanks for the heads up, you guys ever put any assembly lube or grease in there to mitigate it? I might just do so as a precautionary measure

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