- Joined
- Sep 26, 2009
- Messages
- 205
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- 357
I built this engine year's ago
I timed it by removing 2 valves and putting plugs /endmills in the valve bores . Crank end I put it on top dead center with a indicater on the cross head .had the admmisson valve on the gabrclaw and rotated the valve until I just got lead
I then released the grab claw ,rotated the valve opened put it on back dead centerand set the exhaust
to just open
I did the same operation on the back dead center
Now I lifted the governor 5/16 to set the trip which I made drop .200 from dead center
with an indicater on the cross head booth strokes
The engine runs great u n till the valves start to drop ,and runs poorly tell I'm over 40lb air pressure
At which time it smooths out
Now my question is am I pulling a vacuum at the lower pressure nice I don't have the same exspantion as steam, and booth valves are closed as the governor has tripped the admmisson closed
And at the higher air pressure I have more exspantion and the bownce is gone because so is the vacume
If this is the cause I can put sniffer valves in to looose the vacume
I don't want to disassemble the engine to put them in if this is not the problem
Let me know your thought thanks in advance
Todd
