Two carb set up

Talk about the E-Type Series 2

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Moke-man
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Joined: Fri Apr 19, 2019 5:45 pm
Great Britain

#1 Two carb set up

Post by Moke-man » Fri Apr 19, 2019 6:00 pm

I own a series 2 2+2 ex usa. My mechanic is finding it difficult to set up the carbs. He has asked me to ask if the manifold butterflies need to be in use. What, I hear you ask! Any help much appreciated. Is there a paper available to work from? Thank you. Tony

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skiracer
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Location: Littleton, CO USA
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#2 Re: Two carb set up

Post by skiracer » Sat Apr 20, 2019 5:05 pm

The secondary manifold butterflies are NOT needed, and actually interfere with the flow of air/fuel. The simplest method is to simply lock the secondaries open. The next, better method is to remove the butterfly plates from the secondary rods and leave the rods in place to prevent air from coming in through the sides. The next step is to remove the rods as well and plug the holes the rod went through. The final and best solution is to remove everything and sleeve the secondary manifold with a thin brass tube that is either cryo fitted or interference fitted to the intake bore. This completely removes all of the pressure drop across the secondary manifold.
Doug
1968 Series 1.5 E-Type OTS (Early production)

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johnetype
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#3 Re: Two carb set up

Post by johnetype » Sat Apr 20, 2019 9:24 pm

It depends exactly which two carb Stromberg setup you have but there is actually very little for your mechanic to play with - that's deliberate so folks couldn't mess with settings to upset the emissions.

As said, you need to hold the secondary throttles permanently open and apart from balancing the carbs and possibly replacing the rubber diaphragms they should at least run reasonably well without touching anything else.

The standard Jaguar workshop manual gives chapter and verse.
John

1969 Series 2 FHC

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abowie
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#4 Re: Two carb set up

Post by abowie » Sat Apr 20, 2019 11:08 pm

Andrew.
881824, 1E21538. 889457. 1961 4.3l Mk2. 1975 XJS. 1962 MGB
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia

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Tbob
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#5 Re: Two carb set up

Post by Tbob » Sat Apr 20, 2019 11:53 pm

Without knowing precisely what his difficulties may be, I will strongly recommend adjustable jets for the 69-vintage Stromberg carbs , which have non-adjustable jets.

We could not tune the "lean" out of my carbs. Joe Curto adjustable jets were a godsend. REALLY woke up the motor and made tuning and balancing a breeze.

I've said it before and ill say it again: "thank you, Joe!"


Ps: I also removed the secondary butterflies from my intake.
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Bob t

LHD '69 OTS. (Former) basket case

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Moke-man
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#6 Re: Two carb set up

Post by Moke-man » Mon Apr 22, 2019 12:44 pm

My sincere thanks for the informed replies to my request for help. What a great group of enthusiasts. Tony

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