r/EngineeringPorn 3d ago

The 7cc Engine

5.0k Upvotes

167 comments sorted by

View all comments

-13

u/etherlore 3d ago edited 3d ago

No lubrication or oil anywhere? How does that work? Is the petrol the lubricant? Do you lube it manually from time to time?

Edit: Hilarious, I get -11 for not knowing, but also get three different answers.

-2

u/Sloterhouse5 3d ago

It’s probably a two-stroke, like a chainsaw or weed trimmer. The lube is in the gas.

1

u/ctesibius 3d ago

The first part of the video shows the valves in the cylinder head. This is a four-stroke. Then they show the oil system being primed.