Jump to content
Sign in to follow this  

The oil gallery jet to the head is awfully small...

Recommended Posts

That is the small jet in the crank case which feeds oil up through the cylinder wall and into the head (via the bolt above the cam chain).

There are only two little holes in the bottom of the jet - is this all that is feeding that oh so critical oil to the cam journals etc? If something were to block them it would be all over...?

Whats the point of restricting the oil at this point anyway - perhaps to build pressure to the jet which points at the piston skirt?

Share this post


Link to post
Share on other sites

My guess is... the cam journals don't need any real flow... they just need to have enough volume to keep pressure, any more oil than that can cause leaks. Also... the oil is gravity fed back down into the crankcase... so if you have unlimited flow to the cams... you could (in theory) send enough oil to the head to starve the rest of the system.

Sure... if that plugged up... you would starve the cams... but if something plugged the jet... it would be big enough to eat a cam journal also. Besides... your oil should be clean, and filtered before it gets to the critical engine parts.

Share this post


Link to post
Share on other sites

Yeah, I suppose that must be the case. It just makes me a little uncomfortable seeing those two tiny (~0.5mm) holes in the bottom of that jet....

Share this post


Link to post
Share on other sites

Restrictors always serve the purpose of directing flow where it needs to go. Do not be tempted to drill it out.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

×