Originally Posted By: Trav
That depends on the source you used for vacuum, ported or manifold vacuum. You would not want to use manifold vacuum with one of these as manifold vacuum drops off as RPM increases but ported vacuum where the flow at idle would be almost zero but increase with RPM.
The exhaust valve are not in much danger of overheating at idle so any oil drawn in is just going out the pipe and providing little benefit.
To give an opinion as to what happened we would need to know which valves burned and their location in relation to vacuum tapping point.
Getting into ported vacuum would allow relatively even flow to all cylinders.
I followed the instructions included with the new-style Ampco Oiler (not inverse oiler), which result in the device using manifold vacuum. I thought this was sub-optimal going in, but didn't look into it further. I will contact the machine shop this week and find out more details.
That depends on the source you used for vacuum, ported or manifold vacuum. You would not want to use manifold vacuum with one of these as manifold vacuum drops off as RPM increases but ported vacuum where the flow at idle would be almost zero but increase with RPM.
The exhaust valve are not in much danger of overheating at idle so any oil drawn in is just going out the pipe and providing little benefit.
To give an opinion as to what happened we would need to know which valves burned and their location in relation to vacuum tapping point.
Getting into ported vacuum would allow relatively even flow to all cylinders.
I followed the instructions included with the new-style Ampco Oiler (not inverse oiler), which result in the device using manifold vacuum. I thought this was sub-optimal going in, but didn't look into it further. I will contact the machine shop this week and find out more details.