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Experience with "underslung throttle kit" on CR engine?


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Yesterday we have started to mount the underslung throttle kit with new spindles. Everything went well: the steering axis controls well the three (new) throttle spindles. We encounter now the problem, that the cam, which is pulled by the accelerater cable, seems to have not enough "slope": from "idle" to full gas the throttles rotate only about 30 degrees, i.e. the throttles are just a bit open. (For full throttle it would need about 70 degrees.)

Has anybody experienced a similar problem and can give me an advice, what to do?

Wilfried

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I had a problem on my old CP car where I couldn't get full throttle opening. It's important that all the adjustable links are at or near the maximum length before you begin to balance the butterflies. When you have finished it's desirable that at least one link is still at or near maximum length. As I said, that was for a CP linkage but I imagine the principle is the same for the CR.

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I had a problem on my old CP car where I couldn't get full throttle opening. It's important that all the adjustable links are at or near the maximum length before you begin to balance the butterflies. When you have finished it's desirable that at least one link is still at or near maximum length. As I said, that was for a CP linkage but I imagine the principle is the same for the CR.

Thank you for your info. I have the conviction, that the problem is inherent to these specific mecanics. So I would appreciate to hear from somebody who has mounted this specific kit from Pr.. on a CR engine.

Wilfried

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Wilfried

Judging by the abbreviated start to the suppliers name in your posting I am guessing that the linkage is from Prestige Injection.

Quite why you wouldn't want to include the full name I'm not sure, but why not just contact Malcolm at Prestige?

He has always been most helpful to me.

I have one of his overhead linkages, which I don't think he markets anymore, but I have been well pleased with that for approximately 10 years now.

No connection with him, just a satisfied customer.

Dave McD

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Wilfried

Judging by the abbreviated start to the suppliers name in your posting I am guessing that the linkage is from Prestige Injection.

Quite why you wouldn't want to include the full name I'm not sure, but why not just contact Malcolm at Prestige?

He has always been most helpful to me.

I have one of his overhead linkages, which I don't think he markets anymore, but I have been well pleased with that for approximately 10 years now.

No connection with him, just a satisfied customer.

Dave McD

Hi Dave,

I have been last week several times in contact with Malcolm, by E-mail because I am no good in english on the phone. I had two "problems" which he showed me that they were not existing...! As a matter of facts, I would not have had these "problems, if I had found a picture of the new spindles and a more detailed picture of the new assembly. I know, we are today somewhat spoiled by the instructions we get with each thing we have to assemble. Not only by IKEA. So, at the end I was a bit ashamed to have bothered Malcolm two times for nothing, and I mounted the kit with new spindles on my CR engine. Then, Friday late afternoon I stumbled on the problem with the cam, having in my opinion not enough lift to open the trottles sufficiently. I wrote (again) an E-mail to Malcolm. As I intended to continue working on the weekend, and as Malcolm would only find his mail on Monday, I posted my question ("who has experience....") on a german Triumph forum. There are several injection specialists members of this forum, and I have already had several (but unfortunately inadequate) answers today.

Once the question posted on the german forum, I thought why not do it also on the TR register. I tried not to criticize P.., therefore no full name, but just get to know a customer who has this underslung kit mounted, to hear his experience.

Until now, nobody found yet who has mounted tis kit.

Wilfried

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Wilfried, just two ideas:

 

Maybe a detailed photo from the actual setup could help.

 

Why not start from the other side?

Try to setup the linkage that full throttle on all manifolds is nicely achieved.

There should be a defined stop where the linkage runs against that

always a precise "full throttle" is achieved.

Than try to get the necessary space to close letting the help-spindle turn enough

and if not look what it prevents from doing so. Maybe there is a idle adjustment screw.

 

I had the same problems when making my own linkage with the progressive linkage.

It was not easy to get it progressive and still use the whole travel of the foot pedal.

Few millimetres more or less on the lever lengths made a huge difference in travel.

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My problem is solved, thanks to a member of the german TR forum:

The cables for choke and accellerator have to be inverted: choke to the front, accelerator to the rear!

It is the choke, who uses the cam to open slightly the throttle. The accelerator goes directly, without smoothing as it was originally. It will be more difficult to give "a litte" gas!

I still think some written instructions with the kit would make it much more "userfriendly"!

Wilfried

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Glad you sorted it out. With a photo we would have solved it here double quick I'm sure. When I looked at your original post and saw you mention a cam I was a bit surprised but put it down to translation. I am guessing that you hadn't connected the choke cable yet because that would have set the engine racing and might have pointed you to the solution. Still, all's well now.

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