Rover V8 Su Carbs RPM Slow To Drop

nokia_aid · Post by **nokia_aid** » Thu Jan 09, 2014 5:20 pm

Just fitted my new engine into the capri got it all up and running but when i rev it the rpm doesnt drop very fast, im assuming this is something wrong with the su carbs, is this something i can adjust

DaveEFI · Post by **DaveEFI** » Thu Jan 09, 2014 5:55 pm

That sounds like the classic poppet valve problem. They are spring loaded valves in the butterflies which open if you snap the throttle closed to help with emissions. But frequently open too easily. Most just solder them closed.

kiwicar · Post by **kiwicar** » Thu Jan 09, 2014 9:10 pm

Mike

mgbv8 · Post by **mgbv8** » Thu Jan 09, 2014 9:11 pm

Or maybe a small vacuum leak on a gasket ?

nokia_aid · Post by **nokia_aid** » Thu Jan 09, 2014 9:29 pm

i had a spare inlet manifold with recond carbs on so i just fitted that, il get it running tommorrow and hopefully the problem will be fixed, should have done it before i fitted the engine really but was being lazy