2.5 manifold

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minecab

Active Member
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156
Location
milton keynes
I have the weber twin choke carb on a 2.5 in my series 2a and it has given me nothing but trouble, will the manifolds from a 2 1/4 engine fit. I am not looking for performance but reliability. Or is there another carb that will fit on the 2.5 manifold.
 
Yes, the manifolds from the 2.25 will fit the head no problem, but there may be a clearance issue with the starter motor. The exhaust downpipe on the 2.5 manifold is slightly further forward than on the 2.25. I'm building a 2.5 engine at the moment, but haven't got as far as fitting the starter, so can't confirm if it fits or not. No doubt someone on here will know...
I think ACR do an adapter to fit an SU carb onto the 2.5 inlet manifold, but it involves some grinding out of the manifold.
What's the problem with your Weber DMTL? I was planning to use this carb on my new engine, so I'm keen to find out if it has any known issues.
EDIT: The 2.5 SU adaptor is made by HNJ Engineering.
 
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do you mean fuel pressure regulator ? no I am on manual pump .
These engines run electric pump into a swirl pot allowing pressured petrol into the carb.
This allows for for no fuel starvation On wide throttle openings.
Iv not run 1 of these engines without the swirl & standard pump.
Could your set up be causing your problems ?
 
found a broken wire from coil to carb intermitent when I touched it I heard a soliniod click. pulled the wire and it broke, fitted new wire now it drives great again
 
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