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 19Likes
09-16-2018, 08:13 PM
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CC Member
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Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
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Not Ranked
I got it running again but...
...need some help with my Weber’s. I got the passenger side synched to 9 but the driver side to only 5. When I try to bring up the low side the high side goes up. One source said to disconnect the linkage between the sides. I fear if I do that I’ll definitely screw something up
This has become such a stressful and frustrating build beyond anything I ever imagined
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09-17-2018, 05:27 AM
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CC Member
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Join Date: Aug 2013
Location: Canandaigua,
NY
Cobra Make, Engine: SPF MKII Riverside Racer FIA
Posts: 2,496
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Not Ranked
Bill,
I am in no way a Webber expert, but I am starting to learn and am limited in what I can offer. Based upon what I have read and heard from Jim Inglese, one of the things to rule out is binding or looseness in the linkage. I would suggest that with the engine off you manually move the linkage and look and feel for binding or looseness. Do the carbs open and close consistently at the same time. Do it several times, as sometimes it could be on and other times not. You might need to do some adjustments to the linkage. Do you have a top view of the linkage setup?
Jim
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09-17-2018, 09:26 AM
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CC Member
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Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
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Not Ranked
No binding. |
09-17-2018, 10:42 AM
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CC Member
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Join Date: Feb 2013
Location: Carlsbad,
Ca
Cobra Make, Engine: SAI FIA, 289HP (5-bolt), 48IDA Webers
Posts: 1,244
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Not Ranked
Hi Bill,
You need to disconnect the throttle linkage from side to side, the only linkage left on during syncing is front to back. You will have to adjust the throttle linkage links to the center shaft after the syncing has been completed. There should be throttle stop screws at the back of each sides rear carb, if there somewhere else put them there. Adjust the rear two carbs so that they match each other then proceed to the front two carbs and match them to the rear carbs. Now adjust your throttle linkage so that it does not change any of the sync settings. Don’t forget to set each cylinders fuel mixture afterwards, as the volume of air being delivered can change the mixture ratio.
Last edited by CompClassics; 09-17-2018 at 10:58 AM..
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09-17-2018, 11:51 AM
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CC Member
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Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
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Not Ranked
Thanks Comp. will do and report back what happens.
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09-17-2018, 05:23 PM
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CC Member
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Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
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Not Ranked
I did as ComClassics recommended and the car runs like champ. All carbs now synched. Base timing set at 10 deg BTDC. Idles At 1100 rpm
EFEEAA7D B963 4645 BFD9 406559A80DAC - Sendvid |
09-17-2018, 06:03 PM
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CC Member
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Join Date: Aug 2013
Location: Canandaigua,
NY
Cobra Make, Engine: SPF MKII Riverside Racer FIA
Posts: 2,496
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 Way to go Bill! Sounds great. Now it's time to sit back, crack open a beer or a nice wine and relax!
Bill, where did you get your headers? They look nice.
Jim
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09-17-2018, 07:31 PM
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CC Member
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Join Date: Sep 2009
Location: Dallas,
tx
Cobra Make, Engine: FFR track car, SL-C track car
Posts: 1,262
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Sweet.
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09-17-2018, 07:57 PM
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CC Member
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Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
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Quote:
Originally Posted by 1795
Way to go Bill! Sounds great. Now it's time to sit back, crack open a beer or a nice wine and relax!
Bill, where did you get your headers? They look nice.
Jim |
They were custom fabricated by DG Headers in Auburn, CA. I plan to take it back to him and have him put quieter mufflers on. These race mufflers are just too loud |
09-18-2018, 12:47 AM
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CC Member
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Join Date: Oct 2013
Posts: 133
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Engine bay is looking the deal
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09-18-2018, 04:56 AM
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CC Member
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Join Date: Aug 2013
Location: Canandaigua,
NY
Cobra Make, Engine: SPF MKII Riverside Racer FIA
Posts: 2,496
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Quote:
Originally Posted by Bill D
They were custom fabricated by DG Headers in Auburn, CA. I plan to take it back to him and have him put quieter mufflers on. These race mufflers are just too loud
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Good idea going to quieter mufflers. No use going deaf. I have to wear ear protection even with the helmet on when I race. Coming out of the toe of the boot at Watkins Glen in second gear and getting on it, my ears hurt. Take care Bill.
Jim
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09-18-2018, 09:47 AM
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CC Member
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Join Date: Mar 2002
Location: Mooresville,
NC
Cobra Make, Engine: Factory Five chassis/Mr. Bruce slabside
Posts: 601
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"Patience" my friend, "Patience". See, it works.
John O
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jjo42
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09-18-2018, 11:43 AM
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CC Member
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Join Date: Feb 2013
Location: Carlsbad,
Ca
Cobra Make, Engine: SAI FIA, 289HP (5-bolt), 48IDA Webers
Posts: 1,244
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Not Ranked
At what RPM does your ignition mechanical advance kick in? Webers like full advance as soon as possible.
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09-18-2018, 03:46 PM
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CC Member
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Join Date: Jan 2018
Location: Lafayette,
IN
Cobra Make, Engine: Looking to buy
Posts: 1,295
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Looking good! Congratulations on getting them set up! With my webers sitting on a crate in my garage I am feeling a bit jealous!
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 Cobra loving, autocrossing Grandpa Architect.
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09-18-2018, 03:49 PM
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CC Member
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Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
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Not Ranked
Quote:
Originally Posted by CompClassics
At what RPM does your ignition mechanical advance kick in? Webers like full advance as soon as possible.
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I put 20 deg in mechanical advance at 2500 RPM |
09-18-2018, 04:27 PM
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CC Member
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Join Date: Feb 2013
Location: Carlsbad,
Ca
Cobra Make, Engine: SAI FIA, 289HP (5-bolt), 48IDA Webers
Posts: 1,244
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With the aluminum heads you should be able to get more than that, try to get 36.
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09-18-2018, 10:07 PM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,797
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Quote:
Originally Posted by Bill D
I put 20 deg in mechanical advance at 2500 RPM
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Quote:
Originally Posted by CompClassics
With the aluminum heads you should be able to get more than that, try to get 36.
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So with 16 at idle plus 20 in the curve, we'll get 36, which is what I would run to start with.
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Gary
Gold Certified Holden Technician
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09-18-2018, 11:50 PM
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CC Member
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Join Date: Feb 2013
Location: Carlsbad,
Ca
Cobra Make, Engine: SAI FIA, 289HP (5-bolt), 48IDA Webers
Posts: 1,244
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Not Ranked
I guess it's subject to interpretation but I didn't see 36 degrees total mentioned, only 20 degrees at 2500 RPM.
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09-19-2018, 11:09 AM
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CC Member
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Join Date: Feb 2014
Location: White City,
SK
Cobra Make, Engine: West Coast, 460 CID
Posts: 2,908
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Quote:
Originally Posted by CompClassics
I guess it's subject to interpretation but I didn't see 36 degrees total mentioned, only 20 degrees at 2500 RPM.
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16° base timing, plus 20° mechanical advance = 36° total advance.
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Brian
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09-19-2018, 01:54 PM
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CC Member
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Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
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Not Ranked
I currently have base timing at 10 deg with 20 more in the distributor. So I should bump the base to 15 or 16 deg?
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