What did you do to your Camper Today?
After a good washing yesterday I got up early (while the camper is in the shade and the temp has not exceeded 100--yet) to put a good coat of Meguiar's Marine/RV one step Cleaner Wax on. I'm a huge f...
Forum Discussion
Lead in the gasoline did two things, it built up a cushion on the valve face and the seats in the head. If you never ran lead and there was no cushion the valve hitting the seat was like hitting red hot steal with a hammer which mushroomed the valves. That's why unleaded engines have hardened valve seats.
The lead also absorbed heat and slowed the speed of the flame witch in turn kept the engine from pinging. Tetra Ethyl Lead
Go back to the 50s. Propane companies bought trucks to deliver propane. The broke the engines in a leaded gasoline and after from 8-10,000 they converted them to run on straight propane and didn't burn valves for a long time because the lead in the gasoline has already built the cushion on the valves face and seats.
Zinc is critical for a brand new engine's flat tappet cam break in. I've seen cam lopes go flat in the first 20 minutes of the break in. Once the cam and lifters are broken in the zinc isn't soo critical but it certainly cant hurt anything. Zinc provides a friction barrier between the lifter and the cam lobe. That's why roller cam/lifters don't require zinc.
The lead also absorbed heat and slowed the speed of the flame witch in turn kept the engine from pinging. Tetra Ethyl Lead
Go back to the 50s. Propane companies bought trucks to deliver propane. The broke the engines in a leaded gasoline and after from 8-10,000 they converted them to run on straight propane and didn't burn valves for a long time because the lead in the gasoline has already built the cushion on the valves face and seats.
Zinc is critical for a brand new engine's flat tappet cam break in. I've seen cam lopes go flat in the first 20 minutes of the break in. Once the cam and lifters are broken in the zinc isn't soo critical but it certainly cant hurt anything. Zinc provides a friction barrier between the lifter and the cam lobe. That's why roller cam/lifters don't require zinc.
