Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

10 Pages V « < 3 4 5 6 7 > »   
 Reply to this topicStart new topic
> New Carb linkage for /4 engines- RAT "Accu-Link", Another approach for the solution of a long time issue.
Jake Raby
post Jan 6 2010, 07:52 PM
Post #81


Engine Surgeon
*****

Group: Members
Posts: 9,398
Joined: 31-August 03
From: Lost
Member No.: 1,095
Region Association: South East States
QUOTE(r_towle @ Jan 5 2010, 07:00 PM) *

Consider making it totally hidden. That would certainly appeal to a select Type 1 crowd. Hidden being the main unit can be mounted out if sight and the individual cables can attach to the back of the carbs so none of the hardware is visible.

Cable adjustment at each carb with a simple lock nut is perfect for this setup...or some sort of adjustment that you can reach while syncing the carbs...

Rich


In a TI, 356, 912 or Bus application if you want it hidden you simply mount the system on the back side of the carbs. Done

As for patents, I have that being taken care of. I am specifically directing the patent toward a single application that it has not been used in previouslyand isn't of any interest to an aircooled enthusiast.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
biosurfer1
post Mar 22 2010, 11:12 AM
Post #82


Teener fo Life!
****

Group: Members
Posts: 3,020
Joined: 3-August 03
From: Roseville, CA
Member No.: 977
Region Association: Northern California
Well after working on my stupid crossbar linkage for several hours, getting nowhere and ready to convert the crossbar setup into some lawn art, thought I'd check the progress again.

I know Jake has been busy with inventory, but any chance there is a production date yet?

Just so damn frustrating spending time to get the carbs sync'd with it unhooked and having to hold my breath screwing down the nuts on the rods only to have it all get out of whack!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
HAM Inc
post Mar 22 2010, 11:17 AM
Post #83


Senior Member
***

Group: Members
Posts: 850
Joined: 24-July 06
From: Watkinsville,GA
Member No.: 6,499
Region Association: None
I found with one CB hex bar that I set-up that the ratio's were different from one arm to the other, meaning that one carb was getting more travel than the other. I had to drill a new hole for the drop link on one arm to reduce its ratio. Nothing else worked! Drilled the new hole and it worked fine. Both carbs synched up perfect.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
tat2dphreak
post Mar 22 2010, 11:33 AM
Post #84


stoya, stoya, stoya
*****

Group: Benefactors
Posts: 8,797
Joined: 6-June 03
From: Wylie, TX
Member No.: 792
Region Association: Southwest Region
QUOTE(HAM Inc @ Mar 22 2010, 12:17 PM) *

I found with one CB hex bar that I set-up that the ratio's were different from one arm to the other, meaning that one carb was getting more travel than the other. I had to drill a new hole for the drop link on one arm to reduce its ratio. Nothing else worked! Drilled the new hole and it worked fine. Both carbs synched up perfect.



(IMG:style_emoticons/default/agree.gif) we did the same thing... redrilled the holes and re-tapped to match the travel, and geometry.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jeffdon
post Mar 23 2010, 08:55 AM
Post #85


Senior Member
***

Group: Members
Posts: 1,094
Joined: 24-October 06
From: oakland, ca
Member No.: 7,087
Region Association: None
I had an idea for making up a cable linkage (see drawing). Obvviously I have left off things like the mounting for cables at carb side and throttle pedal side, and the drawing is not to scale, but basically the idea is a slider arrangement that incorporates a one cable to two as the key. Seems like you could do all your linkage adjusting at the cable ends and have no effect from engine expansion as the cables to the carbs themselves are not effected.

Am I missing something fundamental here? Seems like it would be pretty simple.Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
VaccaRabite
post Mar 23 2010, 10:10 AM
Post #86


En Garde!
**********

Group: Admin
Posts: 13,736
Joined: 15-December 03
From: Dallastown, PA
Member No.: 1,435
Region Association: MidAtlantic Region
Wish these were on the market now. I am redoing my carb sync, and if these were ready, I'd just buy one. Seems like the best option of all the options out there. It's just not out there yet!

Zach
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
biosurfer1
post Mar 23 2010, 11:44 AM
Post #87


Teener fo Life!
****

Group: Members
Posts: 3,020
Joined: 3-August 03
From: Roseville, CA
Member No.: 977
Region Association: Northern California
Me too Zach...I just hate screwing with the hex bars
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
tat2dphreak
post Mar 23 2010, 11:49 AM
Post #88


stoya, stoya, stoya
*****

Group: Benefactors
Posts: 8,797
Joined: 6-June 03
From: Wylie, TX
Member No.: 792
Region Association: Southwest Region
QUOTE
Wish these were on the market now. I am redoing my carb sync, and if these were ready, I'd just buy one. Seems like the best option of all the options out there. It's just not out there yet!

(IMG:style_emoticons/default/agree.gif) the CB performance setup is a comparable price, but an inferior product that has to be modified in order to truly work right, and then will need more adjustments later...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jeffdon
post Mar 23 2010, 11:53 AM
Post #89


Senior Member
***

Group: Members
Posts: 1,094
Joined: 24-October 06
From: oakland, ca
Member No.: 7,087
Region Association: None
QUOTE(tat2dphreak @ Mar 23 2010, 10:49 AM) *

QUOTE
Wish these were on the market now. I am redoing my carb sync, and if these were ready, I'd just buy one. Seems like the best option of all the options out there. It's just not out there yet!

(IMG:style_emoticons/default/agree.gif) the CB performance setup is a comparable price, but an inferior product that has to be modified in order to truly work right, and then will need more adjustments later...


I currently have a bell crank type set up that pivots on a vertical shaft. Some homebrew thing the PO installed. Its not that bad, all made out of stainless. Put many miles on the car in the late 80s through mid nineties and it never gave any troble. I will try to get some pics.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
biosurfer1
post Mar 23 2010, 11:57 AM
Post #90


Teener fo Life!
****

Group: Members
Posts: 3,020
Joined: 3-August 03
From: Roseville, CA
Member No.: 977
Region Association: Northern California
I've looked at the bellcrank setup and it seems like a decent setup. If I knew it would be several more months I might try it out, but since it should be comparable in price to the cable system, I'm hoping to not spend money twice.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jeffdon
post Mar 23 2010, 12:08 PM
Post #91


Senior Member
***

Group: Members
Posts: 1,094
Joined: 24-October 06
From: oakland, ca
Member No.: 7,087
Region Association: None
QUOTE(biosurfer1 @ Mar 23 2010, 10:57 AM) *

I've looked at the bellcrank setup and it seems like a decent setup. If I knew it would be several more months I might try it out, but since it should be comparable in price to the cable system, I'm hoping to not spend money twice.


Good point. Since I have a set up that I was perfectly happy with for years, think i will leave well enough alone. The temptation to "improve" everything, she is a strong one.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Van
post Mar 23 2010, 12:26 PM
Post #92


Member
**

Group: Members
Posts: 199
Joined: 15-January 08
From: Hyde Park, NY
Member No.: 8,571
QUOTE(jeffdon @ Mar 23 2010, 06:55 AM) *

I had an idea for making up a cable linkage (see drawing). Obvviously I have left off things like the mounting for cables at carb side and throttle pedal side, and the drawing is not to scale, but basically the idea is a slider arrangement that incorporates a one cable to two as the key. Seems like you could do all your linkage adjusting at the cable ends and have no effect from engine expansion as the cables to the carbs themselves are not effected.

Am I missing something fundamental here? Seems like it would be pretty simple.Attached Image



I think that'll work just fine. I recently made a setup like Jake's prototype for my engine, and it's really the cat's meow. Super smooth, easy to adjust and the exact sync as high as my syncrometer goes (up to about 3k RPM)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jake Raby
post Mar 23 2010, 01:13 PM
Post #93


Engine Surgeon
*****

Group: Members
Posts: 9,398
Joined: 31-August 03
From: Lost
Member No.: 1,095
Region Association: South East States
I had hoped to have this on the market now.. But the winter wasn't kind to us here and held up a lot of changes I made to the property. I ended up buying another building next door that had been out of my family for 25 years and my focus quickly changed to converting it into our own manufacturing facility.

The weather was so bad that testing of the linkage system in car would have been a real bitch.

This is a high priority for me but it'll have to wait until the property changes are made and the new facility is open..
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Cevan
post Mar 23 2010, 01:30 PM
Post #94


Senior Member
***

Group: Members
Posts: 1,079
Joined: 11-December 06
From: Western Massachusetts
Member No.: 7,351
While I'm waiting for engine parts for my build this winter, I made up my own cable linkage based on a split cable design. Here is a pic of it on a test stand. I fabricated a piece to connect the stock throttle cable to the two cables from the carbs. I fabricated a hand throttle for my engine test stand and the setup is extremely precise. Very easy to sync the carbs.

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Van
post Mar 23 2010, 02:38 PM
Post #95


Member
**

Group: Members
Posts: 199
Joined: 15-January 08
From: Hyde Park, NY
Member No.: 8,571
Chris, you seem to be a master mechanic and a master carpenter!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jeffdon
post Mar 23 2010, 02:41 PM
Post #96


Senior Member
***

Group: Members
Posts: 1,094
Joined: 24-October 06
From: oakland, ca
Member No.: 7,087
Region Association: None
QUOTE(Van @ Mar 23 2010, 01:38 PM) *

Chris, you seem to be a master mechanic and a master carpenter!


Hey Van, Really appreciate all the work you have done posting your progress on your own site.

By the way, what shade of silver is your car?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jeffdon
post Mar 23 2010, 02:52 PM
Post #97


Senior Member
***

Group: Members
Posts: 1,094
Joined: 24-October 06
From: oakland, ca
Member No.: 7,087
Region Association: None
Here is a pic of the bellcrank. Sorry about the quality. Did not bother trying to get a shot of the rods running to the carbs, as I have them yanked off for more clearance when i slide it under. The arms run fairly straight to each carb when its all together, and i usually run a light return spring on the bell crank.



Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Van
post Mar 23 2010, 03:39 PM
Post #98


Member
**

Group: Members
Posts: 199
Joined: 15-January 08
From: Hyde Park, NY
Member No.: 8,571
QUOTE(jeffdon @ Mar 23 2010, 12:41 PM) *


By the way, what shade of silver is your car?



Just plain metallic silver - L96D. I have a tan interior, though, which is kind of unique.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
VaccaRabite
post Mar 23 2010, 06:31 PM
Post #99


En Garde!
**********

Group: Admin
Posts: 13,736
Joined: 15-December 03
From: Dallastown, PA
Member No.: 1,435
Region Association: MidAtlantic Region
Jake, if you need a test vehicle, my car is ready but for a carb sync. I can have 500 miles on it by Hershey Swap in april.

Just say'n.

Zach
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
r_towle
post Mar 23 2010, 06:55 PM
Post #100


Custom Member
***************

Group: Members
Posts: 24,705
Joined: 9-January 03
From: Taxachusetts
Member No.: 124
Region Association: North East States
QUOTE(jeffdon @ Mar 23 2010, 10:55 AM) *

I had an idea for making up a cable linkage (see drawing). Obvviously I have left off things like the mounting for cables at carb side and throttle pedal side, and the drawing is not to scale, but basically the idea is a slider arrangement that incorporates a one cable to two as the key. Seems like you could do all your linkage adjusting at the cable ends and have no effect from engine expansion as the cables to the carbs themselves are not effected.

Am I missing something fundamental here? Seems like it would be pretty simple.Attached Image

Go to a motorcycle shop or a snow mobile shop.
Your design with the tube is industry standard...lots of options to buy off the shelf.
None that I found addressed the connection to the unique factory cable.


Jake,
You mentioned that you are replacing the cable all the way to the pedal...
Are you using one cable for the whole thing? (I ask because the long cable to the pedal will break...just part of the facts of life)

Also, when do you suspect you will have a weber solution?
I am close (a month away from install of my motor) and I would buy the parts kit and make up one....I already have one built, but I like your solution alot more...its elegant.

Got everything within .5 grams...good enough for a street car.

Rich
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

10 Pages V « < 3 4 5 6 7 > » 
Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 21st May 2025 - 07:06 PM
Invision Power Board v9.1.4 © 2025  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...