Discussion
I wonder if I can call upon your great knowledge of Mini enignes???
After travelling at good speed on a duel carriageway this morning, I pulled off onto a slip road. I was coming down through the gears all the way with blip of the throttle between shifts. I didn’t come to a complete stop at the roundabout and pulled away, at about 15 mph in second. The car ‘pinked’ and gave a puff of blue smoke!!!!
The car has not smoked on start up or under acceleration or at all really, it only seems to do it on the over-run. I tested it out in a similar situation again and it did the same!
Could it be with the throttles closed oil is being drawn down the stems of the valves and when I open the throttles the oil is ‘washed’ into the chamber. So basically valve stem seals???
Spec as follows;
1293cc
10:1 CR
SW5 cam
Twin HS6’s
Stage III Head
Total mileage: 4500miles from build
>>> Edited by TVR Slag's BiL on Tuesday 29th June 10:03
After travelling at good speed on a duel carriageway this morning, I pulled off onto a slip road. I was coming down through the gears all the way with blip of the throttle between shifts. I didn’t come to a complete stop at the roundabout and pulled away, at about 15 mph in second. The car ‘pinked’ and gave a puff of blue smoke!!!!
The car has not smoked on start up or under acceleration or at all really, it only seems to do it on the over-run. I tested it out in a similar situation again and it did the same!
Could it be with the throttles closed oil is being drawn down the stems of the valves and when I open the throttles the oil is ‘washed’ into the chamber. So basically valve stem seals???
Spec as follows;
1293cc
10:1 CR
SW5 cam
Twin HS6’s
Stage III Head
Total mileage: 4500miles from build
>>> Edited by TVR Slag's BiL on Tuesday 29th June 10:03
Sounds like valve stem oil seal problem to me.
Try letting it tick over and remove the oil filler cap (unless you have an enclosed breather system). If you don't get any oil smoke from the filler hole it is not piston blow-by.
I suppose it could be too much oil in the carb dashpots, but that would soon clear. Run it around a bit more and see if it improves.
Peter
Try letting it tick over and remove the oil filler cap (unless you have an enclosed breather system). If you don't get any oil smoke from the filler hole it is not piston blow-by.
I suppose it could be too much oil in the carb dashpots, but that would soon clear. Run it around a bit more and see if it improves.
Peter
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