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Carburation conundrum Print
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andymcp
October 10, 2017, 1:31pm Report to Moderator

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Can the standard Stromberg CD150 carb be made to work with some basic engine modifications?

I have a 13/60 and have managed to accumulate some goodies, which I am looking to install over winter.  Essentially a four branch exhaust manifold/system, K&N filter and Spit MK4 cylinder head (larger inlet valves and higher CR).  Though a cam and carb change would be nice, funds are a bit limited so I'm hoping what I have will suffice for the time being.  I'm not looking for ultimate horsepower.

Any thoughts/advice would be much appreciated.

Andy.
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RobPearce
October 10, 2017, 2:06pm Report to Moderator

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Sure, no problem. We ran a Herald with a 1500 Spitfire engine on the standard 13/60 carb and distributor. It was probably not optimal but it ran fine. You can improve the running by changing the needle - the selection isn't as widely available as for SUs but alternative needles can be got.


Current fleet
1967 Vitesse 2L conv "Tessa"
1970 Spitfire Mk3 (project) "Toby"
1972 GT6 Mk3
Not enough time or space
Recently sold:
1972 2.5 PI estate "Harry" (gone to russell on here)
1973 Toledo 2-door "Spike" (gone to a club official)
Used to have:
1968 Vitesse 2L saloon
1980 Dolomite 1500
1977 Dolomite 1850
1980 Dolomite Sprint
1982 TR7 DHC Sprint
1975 2500S saloon
1971 Herald 13/60 Estate (with 1500 Spit engine)
1975 Stag
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Paudman
October 10, 2017, 7:20pm Report to Moderator

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I ran a 1200 on a Stromberg, using the standard 6J needle - not sure if you'd view that as a forward step for the Herald or a backward step for the carb...


If it was made by man, it can be dismantled and rebuilt by man. Usually just not as easily.
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andymcp
October 11, 2017, 6:49am Report to Moderator

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Next question.  Any suggestions for a bracket for the trhrottle linkage?  The present arrangement bolts to the exhaust manifold, but there is no lug available on the 4 branch.
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RobPearce
October 11, 2017, 9:06am Report to Moderator

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It's a while since I owned the Herald but my recollection is that the throttle linkage is a bit weird. I'd be tempted to change to the simpler Mk2 Vitesse arrangement, where the cable just fits into the carb.


Current fleet
1967 Vitesse 2L conv "Tessa"
1970 Spitfire Mk3 (project) "Toby"
1972 GT6 Mk3
Not enough time or space
Recently sold:
1972 2.5 PI estate "Harry" (gone to russell on here)
1973 Toledo 2-door "Spike" (gone to a club official)
Used to have:
1968 Vitesse 2L saloon
1980 Dolomite 1500
1977 Dolomite 1850
1980 Dolomite Sprint
1982 TR7 DHC Sprint
1975 2500S saloon
1971 Herald 13/60 Estate (with 1500 Spit engine)
1975 Stag
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Bitumen Boy
October 11, 2017, 10:12am Report to Moderator
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Posts: 194
Posts Per Day: 0.15
Quoted from andymcp
Next question.  Any suggestions for a bracket for the trhrottle linkage?  The present arrangement bolts to the exhaust manifold, but there is no lug available on the 4 branch.


How about mounting a plate between the carb and manifold - like a heatshield - and mounting the linkage off that? I knocked up a combined heatshield / throttle cable mount for my 1200's SU conversion that works fine though it isn't the prettiest thing in the world. One day I might get round to making mk 2...
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andymcp
October 11, 2017, 11:18am Report to Moderator

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Quoted from RobPearce
It's a while since I owned the Herald but my recollection is that the throttle linkage is a bit weird. I'd be tempted to change to the simpler Mk2 Vitesse arrangement, where the cable just fits into the carb.


I'll have to find a Vitesse and take a look.

How about mounting a plate between the carb and manifold - like a heatshield - and mounting the linkage off that? I knocked up a combined heatshield / throttle cable mount for my 1200's SU conversion that works fine though it isn't the prettiest thing in the world. One day I might get round to making mk 2...

Great minds think alike!  That is one solution I was considering.  Mine wouldn't be pretty either.  I've only got basic hand tools...
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Bitumen Boy
October 11, 2017, 6:59pm Report to Moderator
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Quoted from andymcp


Mine wouldn't be pretty either.  I've only got basic hand tools...


Likewise. Mine was a bit of a drag to make as I was skint and only had a piece of fairly heavy gauge sheet steel to hand. At least it'll never break...  

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