Need better Carb Linkage - Page 2

mich914 · 11-29-2001, 06:29 PM

DD

It appears TGM's setup is the same as mine, although my CB breather box is much older. I have never used hose clamps, and have no leaks. You get better sealing with stock hoses.

Dan

Joe Ricard · Joe Ricard's Garage

Well it just never seems to be in adjustment when the car is hot. I have been wrestling with it since I got the car in Sept. even put some HIEM jointed ball ends which took out lots of slop. but I am still designing something in the back of "my mind".

Scott S · Scott S's Garage

Joe -
My linkage is similar all of those posted except the arms/hiem joints on the hexbar operate the carbs (44's) from the rear of the carb (trunk side). The bracket that holds my throttle cable is extremely strong and is attached to two of the case bolts. It is the cad plated piece seen below. Hope this helps.

TGM · 11-30-2001, 05:37 AM

Dave got it right. The fourth hose is just blocked off with a bolt. I think that one was intended for the air filter. Dave - I'm using the good braided hose from Pelican - It has such a death grip that I didn't think clamps were necessary. Not enough time on the set up to determine if leaks will be a problem.

Scott - I like the linkage on the car forward side so that the heim joints are more accessible for adjustment. However, making a stiff bracket is easier with your set up because the center arm is pointing down.

11-30-2001, 06:17 AM

DD-

I wasn't sure if that was some sort of crankcase breather adjustment or somthing. heh heh heh.

I noticed it after I posted.

"It's better to keep your mouth shut and look stupid than to open your mouth and be dumb"

Actually I do have a "real" question. Why do I see some carb setups with the breather hoses dumping into the top of the carbs? I suppose there is just a minimal amount of oil coming out of the hoses and it's easier to burn it through the engine. Is that the reason?

HarveyH · 11-30-2001, 07:35 AM

Philinjax mentioned a central bellcrank linkage. I've never seen one. As you say, I never knew they existed. Could you post or send me a picture? I have a crossbar setup, not sure who made it, but it has a cylindrical cross bar with ball joint pivots on the ends and stamped carb and center point actuating arms and pivot point supports. A lot of wobble and lost motion. Have been considering the CB unit, but if there is something as good or better a reasonabe cost, I'm interested.
Thanks,
Harvey

philinjax · 11-30-2001, 08:37 AM

Here is a pic of the center mounted bellcrank throttle linkage in
one of my parts cars. As I had said, it works smoothly with no free play, unless it's in the carb throttles themselves.

http://images.prosperpoint.com/1070/54506-80.jpg

Dave at Pelican Parts · Dave at Pelican Parts's Garage

A buddy of mine has a Type III "Variant 1500S", which is evidently fairly rare. It's a 1500cc single-port engine with factory dual carbs. (That's the rare part.) It has the center-mounted bellcrank.

The bellcrank is not well thought-of because it seems very easy for it to develop free play. Plus it goes out of adjustment when the engine warms up and expands. The cross-bar is regarded as a better design, and the CB hex-bar seems to be one of the best. The cheesy stamped-steel one mentioned by HarveyH has gotten a lot of bad press... (No pun intended!)

--DD

philinjax · 11-30-2001, 12:16 PM

DD,
I go back to the "trick thing". People like trick looking things and that seems to be what the cross bar linkage is. Not that it doesn't work well (the hex type) it is just that it is a little complex to install and over all, expensive and unnecessary. The simple bell crank thingy is a neat design. I don't see how the ball and socket fittings of the bell crank rods would wear differently than the same fittings on the cross bar linkage. Any engine expansion which may affect throttle positions would be minimal and, in any case, a warm engine is when linkage adjustments and tuning is performed.
Phil

Joe Ricard · Joe Ricard's Garage

So the one shot of the fan housing all smooth perdy. Has got my attention. Mine looks like the surface of the moon. Already started smoothing it out. Whew lot of sweat equity in that one.

Conrad W Peden · Conrad W Peden's Garage

I had a set of Kadron carbs on one of my Beetles that had the twisty up down thing in the middle type linkage. I'm guessing thats 'bell crank' linkage.

It worked great as long as i kept the base tight.

campbellcj · 10-28-2002, 12:07 PM

Here's my setup (actually done by the PO):

Kevin Powers · 10-28-2002, 09:19 PM

how about this puppy from triad. i've got one in a box ready for the engine drop.

kevin

Jake Raby · 10-29-2002, 07:54 AM

Recently I have swapped over to linkage from CSP on the 914 engines. This arrangement is designed for TIV engines with 911 shrouds, but with one small bracket to hold the cable you can use it on a stock cooled 914 engine. The linkage is stainless steel, bellcrank style, supported by ball bearings, really smooth and accurate....I have not touched my carbs for 7 months, and now my girlfriend is driving the car everyday...if she did not live 3 hours away I would take a pic and post it for ya..

sacook · 10-29-2002, 08:06 AM

Quote:

Originally posted by Jake Raby
...I have not touched my carbs for 7 months, and now my girlfriend is driving the car everyday...if she did not live 3 hours away I would take a pic and post it for ya..

Hey Jake,

some great stuff here...I think it has answered my question or at least got me thinking in the right direction

...

No need to send pick now....Thanks all for the ideas..SAC