OST-019: Collaboration

[oldeskewltoy]

from another forum Wrote:So is replacing the seat a must in a situation like this? Or is grinding down the seat to the bowl an option? I'd guess it depends on the amount you have to grind down as long as you don't get to the face/valve contact surface?

The mismatch can't really be fixed because the seat is located at the center of the guide. The guides would need to be moved...

I will be consulting with a VERY exp person on this... as of now I see three options...
1) Cut the seat back upto the contact point of the valve... as you suggest. I've done this before.... but not nearly with as bad a seat*
2) put a shallow taper on the bowl to seat area. This isn't ideal, but it will smooth the flow past the seat.
3) this head becomes a core for use as an O/S valve head, while a more suitable head is found.


* I did a bit of creative negative lighting to show some of the specifics of the valves, and seats.

If you look carefully(bottom valves... far left side of seats), this set up shows thinned seats - note the 3rd angle changes its thickness as you scan from right to left

more to come...