dellorto DHLAs choking on left-handers
Posted: July 27th, 2006, 6:08 am
Thought people might be interested in a problem we found with the dellorto DHLA 45's fitted to my 8V 2litre race motor (in a 1969 125). It's possibly a "known" problem but I couldn't find anything on the net about it and it took us a while to find a fix, so if anyone else has the problem I'm happy to share our solution.
Basically we would get fuel-related problems coming out of any tightish left-hand corner at race speed. We tried all the obvious things like fuel surge, fuel pressure and regulation, float levels, etc. etc. but nothing cured it properly. It always felt to me like it was choking. As soon the car got pointed in a straight line again, it would clear up and away we would go.
It turned out fuel was sloshing up the little hole underneath the top jet cover and effectively choking the carb. We fixed it by simply extending the jet covers with drilled blocks and refitting. Apparently this problem is unique to delortos fitted on the driver's left (UK passenger) side of a NS motor...
Will happily provide more detail and pics if anyone is interested.
Basically we would get fuel-related problems coming out of any tightish left-hand corner at race speed. We tried all the obvious things like fuel surge, fuel pressure and regulation, float levels, etc. etc. but nothing cured it properly. It always felt to me like it was choking. As soon the car got pointed in a straight line again, it would clear up and away we would go.
It turned out fuel was sloshing up the little hole underneath the top jet cover and effectively choking the carb. We fixed it by simply extending the jet covers with drilled blocks and refitting. Apparently this problem is unique to delortos fitted on the driver's left (UK passenger) side of a NS motor...
Will happily provide more detail and pics if anyone is interested.