Hope someone might have some ideas.
a bit of history to date...
I have a 1600 twin port with SVDA points distributor with dwell checked at 50 degrees( supplied by the guys at Type2Detectives) and 34 pict 3 carb (a rebuilt unit from Tim at Volkzbits).
The engine was dying on idle though it seemed to run fine under load. Valve clearances set, spark plug gaps set, new leads, timed to 7.5degrees BTDC. It was suggested it could be a vacuum leak. I therefore dropped the engine and refitted the manifold with new gaskets and boots to ensure no vacuum leaks - also drilled out the heat riser which is now working. I have an oil bath air filter with the pre-heat hose fitted.
After a run I found that the engine died at the lights/road junctions with a flat spot when trying to rev. The engined fired straight up when cold but when hot it took a while to catch needing to be turned over 6 or 7 times.
It was suggested that given what I had done to date that it might be a problem with the carb flooding and that the pump might be supplying too much pressure at idle.
I have just fitted a new pump.
Coming to re-set the timing following refitting I am now finding I have to retard the ignition to get it to run. If I twist the dizzy until it runs at its sweetest and check the position using a static timing light I find I am at about 10 degrees ATDC rather than 7.5 BTDC ?
Anyone any thoughts or ideas why? Would it cause damage to set the timing at this point (it was roughly 7.5 degree BTDC before the pump change)
Tim
a bit of history to date...
I have a 1600 twin port with SVDA points distributor with dwell checked at 50 degrees( supplied by the guys at Type2Detectives) and 34 pict 3 carb (a rebuilt unit from Tim at Volkzbits).
The engine was dying on idle though it seemed to run fine under load. Valve clearances set, spark plug gaps set, new leads, timed to 7.5degrees BTDC. It was suggested it could be a vacuum leak. I therefore dropped the engine and refitted the manifold with new gaskets and boots to ensure no vacuum leaks - also drilled out the heat riser which is now working. I have an oil bath air filter with the pre-heat hose fitted.
After a run I found that the engine died at the lights/road junctions with a flat spot when trying to rev. The engined fired straight up when cold but when hot it took a while to catch needing to be turned over 6 or 7 times.
It was suggested that given what I had done to date that it might be a problem with the carb flooding and that the pump might be supplying too much pressure at idle.
I have just fitted a new pump.
Coming to re-set the timing following refitting I am now finding I have to retard the ignition to get it to run. If I twist the dizzy until it runs at its sweetest and check the position using a static timing light I find I am at about 10 degrees ATDC rather than 7.5 BTDC ?
Anyone any thoughts or ideas why? Would it cause damage to set the timing at this point (it was roughly 7.5 degree BTDC before the pump change)
Tim