Alphabettispaghetti
Club Member
Larger than 44/35?
They look slightly proud to me, however i'm going to get one lapped in, some engineers blue and look at the interface.Not me, but I think those pics look ok for how the valves should sit.
Yes, I do think the larger valves seat needs to be 1mm bigger. It does need building up to check the stem height, unbuilt it will get 90% of the way there.Valves are always a little proud. Lapping is only for getting them to sit nicely, and won't take a lot of the seat away.
Maybe an idea to measure installed height of the stem, so when the rocker assembly is added, the lash pads are nearer to the same thickness. I had a head done with new valves, and every valve required a different lash pad (some with quite a size difference).
Then you are onto ccing the combustion chamber?
So, is the valve seat stock then, and sitting with larger valves? I thought larger valves need larger seats, as the valve then isn't the restricting factor..?Yes, I do think the larger valves seat needs to be 1mm bigger
I don't think that's always the case; somewhere in my collection of fun bits for L-gata engines, I've got a set of Japanese valves (can't remember who by) that are meant to be the largest you can use with stock L28-size seats - I think they are 45/36.5mm as opposed to the standard 44/35. This compares to the typical full race/big valve sets of 46/38.So, is the valve seat stock then, and sitting with larger valves? I thought larger valves need larger seats, as the valve then isn't the restricting factor..?