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Manifolds, etc. (archive)

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Posted by mikeS on June 29, 2001 at 14:29:26:

In Reply to: Re: Use two throttle return springs! posted by Hoa on June 29, 2001 at 13:57:20:

I'm using vintage TISA manifolds and modified Top-End cable linkage. I don't care for the linkage much, but now that I've worked the bugs out it seems to work OK. Top-End's linkage kit comprises two brackets, carb throttle shaft levers, and a cheap bicycle-brake cable. I paid them about $100 for it. The brackets are sturdy. One attaches to the brake booster bracket; it slides under the big nut that captures the brake lever pivot. If you look at it from above, this bolt lines up with the end of the throttle pedal lever, down in the tranny tunnel. From this bracket down to the lever, the cable is exposed--no jacket. I don't like this much because if you don't get the alignment exactly correct, the cable will bind and fray. The pedal lever moves in an arc, so naturally the cable will rub a little on the fitting. The second bracket attaches to the underside of the Weber, by means of the screws that secure the bottom float bowl cover. The upper end of the cable sheath ends in a tension adjustment fitting on this bracket, and the inner cable extends upwards to the cylinder #1-2 throttle lever.

I had to replace the inner part of the cable because it kept fraying. I've purchased a Lokar "high-tech" braided stainless/teflon lined cable that I will fit one of these days. Meanwhile I replaced the original cable core with a piece of a VW Beetle throttle cable ($3.99 at the local bug house).

Another thing I don't care for regarding the TEP fitment is the throttle return spring setup. Namely, there is none, and the TEP levers sit at a different angle than the orignal levers. The throttle levers require some grinding and fitting at installation, and I drlled them for return springs as well. Trouble is that the TISA manifolds place the spring anchors such that, using TEP's levers, the springs are stretched perfectly in line with the throttle bearing (180 angle from tip of lever, to bearing, to spring mount) at wide-open throttle. This means that if you are not careful with drilling the spring holes in the levers, the throttles might stick wide open due to friction and spring tension. That's not fun.

The original TISA linkage setup used a bellcrank mounted on a post on the #3-4 manifold. A rod ran from the crank to the firewall, where another crank setup transferred the motion to a rotation
of a rod that ran along the firewall. Someday I will probably reproduce this setup, because it leads to solid rods all the way to the pedal.

Mike


What linkage and manifolds are you using? Is it off of another BMW? I've heard the linkage from a 2000CS Coupe will work well with minor modifications. TIA.

Hoa





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