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Super Moderator
Who said you can't put 8 carbs into a little Mark I!!
My first start after the Webers were tuned in a little and after a few struggles with getting a manifold, then there was the issues with the throttle, and finally finding a cam that would work with 8 Webers. OH and water leaks front and back - rear water leaks were fixed with a new hose between the banks in the manifold. The front leak was the heater hose was real soft and was no longer holding a seal new better quality hose fixed that problem! New distributor with no vacuum. all mechanical advance. Also this distributor you can set the electronic rev limiter!
Now off to get the car inspected. Followed by finished tuning and preparing for the Watkins Glen track opening day!
Ralph Button
FFR 1436 (PROUD Owner of an Original Mark I)
400,013 miles as of 11/1/2009
417,840 miles as of 8/12/2010
435,021 miles as of 12/19/2011
Now a well broken in 347 engine
523,145 miles as of 7/29/2014
601,165 miles as of 6/1/2018
615,215 miles as of 4/23/2022
"It's not about the destination, it's the about the journey. And where is your journey taking you?"
"... Not all who wander are lost!... --J.R.R. Tolkien
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Post Thanks / Like - 1 Thanks, 8 Likes
CaptB thanked for this post
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Super Moderator
More pictures to come! It's been a long winter project that I have always want to try.
Ralph Button
FFR 1436 (PROUD Owner of an Original Mark I)
400,013 miles as of 11/1/2009
417,840 miles as of 8/12/2010
435,021 miles as of 12/19/2011
Now a well broken in 347 engine
523,145 miles as of 7/29/2014
601,165 miles as of 6/1/2018
615,215 miles as of 4/23/2022
"It's not about the destination, it's the about the journey. And where is your journey taking you?"
"... Not all who wander are lost!... --J.R.R. Tolkien
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Senior Member
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That is actually 4 carbs, not 8.
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Post Thanks / Like - 0 Thanks, 1 Likes
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Party pooper. way go Ralph.
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Super Moderator
Ya dual webers sharing a casting. Each of the 8 carbs has to be adjusted separately, making it a long slow process. Then with two banks have to get that throttle to open each bank at exactly the same time. I'm not use to Webers - more Holly carb design, BUT the more I work on the Webers they are not bad! They have a whole different sound to them out on the road!
So I'll say 4 or 8 depending on your viewpoint. 8 for every one must be tuned separately or 4 as they come as two carbs in the same casting.
Either way meet Brandy with a new "growl" to her!
Ralph Button
FFR 1436 (PROUD Owner of an Original Mark I)
400,013 miles as of 11/1/2009
417,840 miles as of 8/12/2010
435,021 miles as of 12/19/2011
Now a well broken in 347 engine
523,145 miles as of 7/29/2014
601,165 miles as of 6/1/2018
615,215 miles as of 4/23/2022
"It's not about the destination, it's the about the journey. And where is your journey taking you?"
"... Not all who wander are lost!... --J.R.R. Tolkien
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Senior Member
Outstanding they are a joy and a curse I do love mine running on a 347 also with 44IDF carbs. When I first bought mine I think it was only because the previous owner gave up. It was shooting flames out of the side pipes as the timing was off and too much fuel pressure was blowing past the floats at 16PSI. After a few conversations over the phone with Jim Inglese who was kind enough to help even though they were not his setup I got them sorted. Here is some information I saved from then that may be helpful.
https://jiminglese.com/weber-tech
Weber 44 IDF Setup
Main jets – 145
Idle jets - .65
Emulsion Tubes – F11
Air Corrector – 175
Floats – 11mm open without ball valve being depressed
My timing is all in early before 3K RPM at 38 degrees BTDC and roughly 20 degrees initial.
1. With motor off, Disconnect linkage between carb left and right side
2. Back idle speed screws out till not touching, then turn in ½ turn on each bank
3. Set idle mixture screws to ¾ or 7/8 turn out from seated
4. Start motor
5. Synch carbs on each side using only adjustment screw on linkage between carb banks
6. Reconnect linkage between carb banks
7. Adjust linkage between banks till left and right side banks are in synch then lock down linkage
8. To set best lean mixture, for each cylinder
a. Turn idle mixture screw out 1/8 turn
i. If idle speed increases stop, if not repeat 8a till idle speed increases then stop
ii. If idle speed decreases or does not increase, turn idle mixture screw in 1/8 turn till idle decreases then back off 1/8 turn
b. Repeat for each cylinder
9. Check each spark plug condition after driving for lean or rich, adjust each cylinder as needed. 1/8 turn in on idle mixture screw if rich, 1/8 turn out if lean.
10. If you have a flat spot during transition from idle to main circuit, back each idle mixture screw out 1/8 turn.
I will say I run mine a little rich too because if not you get lean pops out of the side pipes on deceleration. Which scares the you know what out of my wife and makes the experience not good.
Last edited by svassh; 03-27-2024 at 09:34 AM.
MK2 Roadster - 347 - Boss 302 Crate 4x2 Weber 44 IDFs
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Post Thanks / Like - 1 Thanks, 1 Likes
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Super Moderator
Jim is amazing! He has been doing Weber's for so long he has them memorized!
I was able to find a cam that is very close to Jim's cam design. CompuCom's was manufacturing them but they have become very difficult to find. Finally while talking about an order I had a place, seems the company was testing the Ford E303 cams and had come up with what they were calling the E303+ cams. They match very nicely with Jim's design! will see how they do out on the track and street driving.
With the fuel pressure regulator in place I was able to get the fuel down to under 3psi which also helped a lot!
Last edited by R. Button; 03-27-2024 at 03:53 PM.
Ralph Button
FFR 1436 (PROUD Owner of an Original Mark I)
400,013 miles as of 11/1/2009
417,840 miles as of 8/12/2010
435,021 miles as of 12/19/2011
Now a well broken in 347 engine
523,145 miles as of 7/29/2014
601,165 miles as of 6/1/2018
615,215 miles as of 4/23/2022
"It's not about the destination, it's the about the journey. And where is your journey taking you?"
"... Not all who wander are lost!... --J.R.R. Tolkien
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Senior Member
Package AKA 4 Weber Twin Choke Carburetors.