Lotus Elan

Throttle linkage vs Weber

PostPost by: gjz30075 » Wed Apr 29, 2009 12:18 am

I'm trying to put on the low profile throttle linkage assembly and I'm stumped as to what to do here, although I think I know the answer. The standard Lotus bellcrank on the carb, when connected to the new bellcrank of the linkage, runs right into this threaded 'ear' on the throttle body part of the carb. It wasn't an issue with the standard cable, although it just grazed it during its travel. Now, with a bolt connecting the two bellcranks, it can go no farther than this 'ear'.

This would not be an issue on an older DCOE but the newer 151 type DCOEs, this ear is here. I'm thinking of lopping it off, as it has no purpose for a Lotus application that I can see but I'd like to hear otherwise.

Thanks,
Greg Z
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I'm pointing the ear. There's one on each barrel, protuding like.....ears.
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PostPost by: GrUmPyBoDgEr » Wed Apr 29, 2009 7:57 am

Many racers fit the TTR throttle linkage system, it is very low profile. It works well with the modern 45 DCOE's that I have in my Elan.
I believe the same linkage is marketed in the US under another name.

Good luck
John
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PostPost by: gjz30075 » Wed Apr 29, 2009 11:16 am

John, do your 45's have these little threaded ears coming off the sides of the throttle bodies, like shown?
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PostPost by: cabc26b » Wed Apr 29, 2009 11:47 am

I did not have this issue on my 45's see pict for reference
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PostPost by: GrUmPyBoDgEr » Wed Apr 29, 2009 12:05 pm

Here are some Photo's which I think depict the "ears" that you are concerned about.
You will also see that I did have to file away some material on one of the top webs to make clearance dor the bellcrank.
Hope this is of some use.

Cheers
John
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DSCN0794.JPG and
DSCN0793.JPG and
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PostPost by: gjz30075 » Wed Apr 29, 2009 1:52 pm

Interesting. I see Cabc... arrangement has tons of clearance by the web that John had to file down. John, why did you put your cable on the forward most clamp, vs the rear one?
Could you have then shifted the rod (the one that clamps the cable) rearward and have the clearance needed?

Although both Cab.. and John have the later carbs with the ears, neither has the clearance issue that I'm encountering. So far, I'm leaning toward lopping the ear off.
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PostPost by: GrUmPyBoDgEr » Wed Apr 29, 2009 3:31 pm

gjz30075 wrote:Interesting. I see Cabc... arrangement has tons of clearance by the web that John had to file down. John, why did you put your cable on the forward most clamp, vs the rear one?
Could you have then shifted the rod (the one that clamps the cable) rearward and have the clearance needed?


Although both Cab.. and John have the later carbs with the ears, neither has the clearance issue that I'm encountering. So far, I'm leaning toward lopping the ear off.


I'm not quite with you there.
Looking at my last Photo the cable is clamped in the outer of two positions on a quadrant, giving greater mechanical advantage creating proportionally greater accererator pedal movement with reduced load.
I found that the integrated return spring was quite strong & made the throttle too heavy which induced "Kangaroo starts"
Using the inner (lower) one with reduced radius would have worsened the effect..
Throwing out the supplied cable & replacing it with a nylon lined one (discussed in a previous thread) transformed the set up.
Going back to the last Photo again & my misunderstandiong of your Q.
The "rear one" which can be seen is not a cable clamp but the knuckle joint to the link connected to the throttle spindles.

Yes why not lop 'em off, if you're not using them. Ol' Colin would approve :wink:

Cheers
John
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