Quote:
|
Originally Posted by Barry_Bordes
NoDOHC, check the remaining good seal under a microscope for a crack where the others failed.
Also what water pump are you running?
Did you bevel the spark plug holes? It appears that way from the pictures.
Barry
|
I looked at it as carefully as I could and didn't see anything (I didn't want to get yelled at for using the magna-flux at work again).
I re-used that seal. I have over 2500 miles on the engine since the failure and have had no issues.
Stock water pump, stock radiator (a lot of fins are rotted out, I am replacing it).
I read this thread earlier and I found the tell-tale pattern on my housings, so I figured that beveling the edges was a good idea that may keep me from losing an engine. It survived 3000+ miles on the street just fine, but didn't survive the dyno run.
I should have backed out of the throttle and had the dyno turn the loading down, My coolant temp was about 125 C when the seal went. I went to the dyno since then and had no issues (with the temp under 115 C) I think that the spark plug boss grows too much relative to the unsupported housing around it. I have considered welding a brace in (parallel with the coolant flow) to keep the surrounding housing growing at a similar rate to the spark plug hole (although the spark plug hole has threads in it).
I like racing beat's idea - if I had this information before I rebuilt the engine, I probably would have done that.