Breaking the barrier

Talk about E-Types here
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markc555
Posts: 75
Joined: Mon Aug 04, 2014 5:47 pm
Location: Surrey
Great Britain

#21 Re: Breaking the barrier

Post by markc555 » Sun Dec 15, 2019 9:58 am

I found this article Mark... https://www.howacarworks.com/fuel-syste ... arburettor

I have an S2 on Strombergs. On mine the exhaust deposits on the inside of the off side tailpipe is noticeably darker than the near side one suggesting it is running rich(er). I’ve done the secondary throttle linkage mod which has improved drivability but not gotten around to adjusting the carbs. A job for this winter methinks :geek:

Cheers

Mark
1969 S2 FHC (Opalescent Maroon)

"The older I get, the faster I was"

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johnetype
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Joined: Sun Feb 26, 2012 11:54 pm
Location: Worcestershire
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#22 Re: Breaking the barrier

Post by johnetype » Sun Dec 15, 2019 10:37 am

max-it-out wrote:
Fri Dec 13, 2019 9:20 am
So you seem to be saying that all the Stromberg CD s as fitted to US spec cars can be adjusted.
No, not really on S2s they can't be adjusted very much. The Jaguar Service manual in the Emissions Section gives an explanation on what can be done but basically unlike SU's each carb was individually calibrated during the production process so that it's performance would be identical to that needed for efficient operation. That way it would continue to function at the right settings without anyone being able to get in and "improve" it.

Eventually it would wear out and there were some components you could service along the way - as described in the Jaguar Service manual - but Jaguar went down this route of using a more expensive carburettor than an SU so it would always give as near as possible correct mixture without the tinkering and adjusting folks do to SUs.

Confusion arises because there were versions of Strombergs which externally look very similar which did have an adjustable jet and were used on other cars at the time. If you want to fiddle then arguably you could fit a pair of those but at that point you could also fit fuel injection, triple SUs, even twin SUs as Jaguar used on most XK engines. The choice goes on.

On my car the front Stromberg already had the tapped vacuum take off point for the distributor vacuum advance in the carb body but just not drilled through. I fitted an appropriate barbed brass adaptor, used it as a guide to drill out something like a 3mm hole into the carburettor body in the correct place above the throttle butterfly and it works perfectly. I didn't need to remove the carb from the car. :wink:
John

1969 Series 2 FHC

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Dave Dawson
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Joined: Sat Nov 05, 2011 10:54 am
Location: BOSTON UK
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#23 Re: Breaking the barrier

Post by Dave Dawson » Wed Dec 18, 2019 1:33 pm

HI Mark My E-type S2 2+2 is fitted with a compact A type Overdrive std 3.07 dif tri carb uk spec engine.
cross country with mixed A and motorway driving 28 mpg is achievable .
David Dawson S2 2+2 o/d Frogeyed sprite
Triumph Tr5 Tr3a

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