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> Carb Setting Nightmare, Always better to do it yourself??
SGB
post Sep 29 2008, 07:37 PM
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QUOTE(r_towle @ Sep 29 2008, 11:53 AM) *

QUOTE(ArtechnikA @ Sep 29 2008, 12:08 PM) *

It's all about balancing all the nonlinearities...

(IMG:style_emoticons/default/idea.gif)
I need a new dictionary.

Rich


I believe he is right , though. Webers have a buncha little "corrective features" that adjust the basic venturi- vacuum draw fuel provision. I think it is just good luck that the characteristics of the t-IV work well with the chosen approach. I like the term...

Then there is that "non-linearity" induced by the linkage, of course. Thats another discussion. Oh wait, thats this discussion.




OK.
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watsonrx13
post Sep 29 2008, 07:43 PM
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QUOTE(Joe Ricard @ Sep 29 2008, 03:37 PM) *

Rob Watson you paid attention to my engine you would see a very similair linkage set up like the CSP unit.


Yep hook it up and balance flow side to side and leave it alone. I am using Spherical bearing vs. the clip and ball sockets. but pretty much the same.


Yea I know Joe, but you said you didn't know where it came from, that's why I was asking .... (IMG:style_emoticons/default/shades.gif)

-- Rob
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chris914
post Sep 29 2008, 10:42 PM
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QUOTE(watsonrx13 @ Sep 29 2008, 04:30 AM) *

QUOTE(chris914 @ Sep 28 2008, 10:29 PM) *

Thanks, The bracket is made of stainless steel to match the linkage made by CSP. I had the bracket CNC from an AutoCAD file I drew up.

http://www2.cip1.com/ProductDetails.asp?Pr...129%2D941%2D400


Chris, excellent set up, it's what I've been looking for. (IMG:style_emoticons/default/aktion035.gif)

Can you post the dimensions of the cable bracket you made?

-- Rob


I can send you the AutoCAD file tomorrow if you want.
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watsonrx13
post Sep 30 2008, 06:08 AM
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QUOTE(chris914 @ Sep 29 2008, 11:42 PM) *

I can send you the AutoCAD file tomorrow if you want.

Chris, PM sent...

-- Rob
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Gint
post Sep 30 2008, 05:29 PM
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QUOTE(chris914 @ Sep 29 2008, 10:42 PM) *
QUOTE(watsonrx13 @ Sep 29 2008, 04:30 AM) *
Chris, excellent set up, it's what I've been looking for. (IMG:style_emoticons/default/aktion035.gif)

Can you post the dimensions of the cable bracket you made?

-- Rob
I can send you the AutoCAD file tomorrow if you want.


I also asked Chris if he minded if we made it available on the site. This way folks that want it later could download it from here. Simply refer to this link.

http://www.914world.com/image/CSP_Bracket.dxf
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curt
post Oct 1 2008, 09:41 AM
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Hello All

Been lurking here a while and this subject caught my attention as I too am not thrilled with my crossbar set up for the Webers.

Anyway, Chris, thanks for posting the photo of your setup. Have not seen that setup before and am inclined to toss my crossbar set up for this one.

Just a question or two before I go and do this.

Since the whole setup is located toward the back of the engine, what throttle cable do you use to reach it?

Do you by any chance have a photo of where the arms connect to the carb throttle arms? Basically, what kind of throttle arm is on each of your Webers to connect all this up?


Lastly, I've heard that one of the disadvantages of this type of linkage is that the throttle settings will be disturbed as the engine heats up.
What has your experiance been? Have you noticed this effect at all?

Hey, thanks again for posting the info and also the cable bracket .dxf file. (IMG:style_emoticons/default/biggrin.gif)

Curt
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IronHillRestorations
post Oct 1 2008, 12:20 PM
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Years ago there was a discussion about carb linkage and four cylinders, and I seem to remember that someone had a problem with the center mounted bell crank linkage and thermal expansion of the engine. Is this just BS?
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Jake Raby
post Oct 1 2008, 12:33 PM
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I also carry the CSP unit and have a modified version of it as well.
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Mark Henry
post Oct 1 2008, 02:19 PM
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QUOTE(9146986 @ Oct 1 2008, 02:20 PM) *

Years ago there was a discussion about carb linkage and four cylinders, and I seem to remember that someone had a problem with the center mounted bell crank linkage and thermal expansion of the engine. Is this just BS?


You just need a hair of slack in your cable for expansion. Most likely there was an installation/set-up issue

Think about it...as it expands the linkage would equally adjust with the expansion, as long as it has slight slack on the wire (at idle).
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chris914
post Oct 2 2008, 03:07 AM
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Because it is a little longer I used a Terry cable. But even thou it is longer I did have to re-route it. I circled it in yellow in the picture. Were the cable passes though the body I put a piece of hose around it to protect it.

The arms came with the CSP setup and they are made of stainless steel. Stainless steel is heavier but it just looks and feels so dam nice.

As far as the engine expansion I looked at it as this way. The expansion is really small, it is more or less equal on both sides, and I tuned everything once the engine was warmed up. Having said that I haven’t noticed any major difference between cold and hot. Or at least no more then you would expect with cold carburetors warming up.

I did have to add an extra spring to make the linkage snap back properly and to satisfy the Autocross rules.

I’m much more happier with the CSP setup.

Attached Image

I did fix the filter in the air cleaner cover. (IMG:style_emoticons/default/smile.gif) It was bent from previous metal cover.

Attached Image

Attached Image

The spark plug wires do look closer to the arms then they are.
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ChrisFoley
post Oct 2 2008, 08:15 AM
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I have done a couple of installations using this linkage. I made an alteration to the bellcrank and made a different cable mount that better accomodates the stock cable.



Attached image(s)
Attached Image
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chris914
post Oct 2 2008, 12:12 PM
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That’s interesting. I take it that your linkage is setup to push instead of pull.
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porsche914gt
post Oct 2 2008, 01:18 PM
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Jake, I cant find the linkage at the Type4 store.
Do you have the link?
Thanks.
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curt
post Oct 2 2008, 01:55 PM
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Chris914 and Racer Chris thanks for posting the photos for folks like me who have not seen this linkage before and how its mounted.

BTW, Chris914, I looked at your website and the autocross photos and videos. Really cool, your car scoots.

Yeah Jake, I also looked on your type IV website store and did not see the CMP liknkage.

I am not sure how to handle the lack of a throttle cable mount. (IMG:style_emoticons/default/confused24.gif)

Does the CMP product line include one for purchase?

Thanks again guys for the photos and info. (IMG:style_emoticons/default/bye1.gif)

Curt
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Mark Henry
post Oct 2 2008, 02:27 PM
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The CSP unit looks OK, But I'd still bend up my own arms.
I like the arm to be 90 degrees from the throttle shaft (and center crank) so there is no side loading on the shaft at all. Makes for a smoother more accurate linkage.

If you look at my pic on page one, you can just make out how it's bent on the end to achieve this.
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ChrisFoley
post Oct 2 2008, 05:39 PM
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QUOTE(chris914 @ Oct 2 2008, 02:12 PM) *

That’s interesting. I take it that your linkage is setup to push instead of pull.

Yes.
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