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Zenith Stromberg Carburetor Vacuum Lines Schematic  Rate Topic 
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 Posted: 03-30-2005 11:51 pm
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Mark Rosenbaum
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A question came up elsewhere about how the vacuum lines work together on an engine with Strombergs.  The shop manual doesn't really show this, so I created a simple sketch.

Attachment: JH Vacuum Lines.gif (Downloaded 270 times)

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 Posted: 10-18-2013 11:29 pm
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pjg55
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Hi Mark,
Thanks for creating this schematic.

My question is what are the consequences of simply plugging off all these vacuum lines at the carb ? I have already converted the distributor to a non-vacuum assisted version and removed the carbon canister.

It would seem these are purely for emissions purposes and could be eliminated.

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 Posted: 10-19-2013 12:39 am
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Jensen Healey
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I'm sorry to inform you that Mark Rosenbaum has passed away.

I don't know how removing all the vacuum lines would affect the performance of the engine.

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 Posted: 10-19-2013 02:26 pm
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Brett Gibson JH5 20497
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I have removed most of the vacuum lines and plugged them off leaving only the inlet manifold to the brake booster, plus I blank off the by-pass valve on the side of the carbs and adjust the temperature compensator so that it does not move and seals that chamber as well. Having done that and driven the car thousands of miles and done the same for a few other cars all I can say is it works for me.

Brett

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 Posted: 10-23-2013 12:37 am
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pjg55
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Thanks for the info Brett. That is what I was looking for.

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 Posted: 12-15-2017 01:08 pm
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chrisl
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I have removed most of the vacuum lines and plugged them off leaving only the inlet manifold to the brake booster, plus I blank off the by-pass valve on the side of the carbs and adjust the temperature compensator so that it does not move and seals that chamber as well. Having done that and driven the car thousands of miles and done the same for a few other cars all I can say is it works for me

Hi Brett

I've acquired a set of Strombergs and am refurbishing them to fit on my GT. It currently has Dellortos on it and runs fine other than the stutter on flooring it but I think the Strombergs will make for smoother running.

Anyway, a lot of the pipework on the Strombergs is missing so I am working through what goes where. The shop manual is no help; and I see from your post above a lot of the vacuum lines aren't really necessary anyway.

I think I've got a good idea of what goes where but it would be good to confirm. Do you have a picture handy that shows which ones you've capped?

Did you also ditch the carbon canister? It wasn't fitted to RHD cars as far as I can tell.

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 Posted: 12-16-2017 07:49 am
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answerman
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Hi Chris: if this helps, I went through the removal of most of the vacuum lines when I was sorting out some running issues a couple of years ago (turned out to be distributor related). Still, I agree that most of the lines are unnecessary.

I removed the vacuum switch since it wouldn't be doing anything anyway, and also removed the vacuum retard line to the distributor (I ended up installing a different distributor that didn't have the retard).


Here's a "before" and "after" diagram (the "before" diagram is actually Mark's).

Before:





And after:




The original post with context is here: http://www.jensenhealey.com/forums/view_topic.php?id=1798&forum_id=15&page=6 (starts around post 107)

Last edited on 12-16-2017 07:55 am by answerman

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 Posted: 12-16-2017 12:39 pm
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chrisl
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Brilliant; that answers the question.

These Strombergs have more holes than a block of Swiss cheese, plugging them saves a lot of messing around. I'm all for originality but...

Thanks a heap

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