Didn’t do a great deal today, but progress is progress
I started off with pressure testing the intake port to see at what pressure the inlet valves start to leak.
At 10psi they were weeping
I was as thinking the springs can’t possibly be that weak so I whipped the 2 inlet valves out and lapped them in
while the springs were out I measured them just in case this doesn’t work out and I need some uprated ones. 45.40mm x 3.28mm
After spending a few minutes what feels like trying to start a campfire with a stick and sucker plus some lapping paste I ended up with this
also used this little trick when putting the collets back in. It saves a lot of frustration
Anyway with the valves back in and the intake manifold back on, I splashed a bit of diesel in the combustion chamber and proceeded with the retest.
10psi no leak
20psi no leak
30psi no leak
40psi no leak
50psi blew the silicone joiner off the manifold.
I decided to leave it there because realistically I’ll probably only get to run half that boost pressure on standard rods.
at least I know the valve springs are up to the job. I’ll have to spend a fair while lapping the lot in. But now I’m wondering if I should give the ports a quick port and polish when I have all the valves out.
I know it’s not going to make a great deal off difference but every little an all that. Plus it’s a bit rude not too when all the valves are out isn’t it