Heads are IK215 Brodix.
-no detonation. Rich
-hydraulic roller/Johnson lifters
-180 seat/425 open
-pulled to 7200 free revs to 8000 hits limiter (when prop out of water)
-cooling: water pumped into water pump entrances on block, front manifold crossover blocked, water comes out of rear of manifold to front rises out of extended water neck then out to exhaust. Engine in backwards and on a 12deg angle pointed up in front. 1/16 bleed holes drilled in front water crossover block offs for air bleeds. Engine is in a boat.

- 1/3 of no 1 intake seat sunk into head deforming aluminum. No 3 did as well but not as bad. No 1,3,5 intake valves elongated,1 and 3 were tuliped slightly.
- Brodix says it was heat but did say possible aluminum hardness problem. There were no signs of heat…chambers say it was rich, plugs said same thing and absolutely no heat signs on underside of all pistons.

Anyone have any insight? Thanks -Sonny

All on one head? If lack of cooling was the issue both heads should have failed also. Assuming these are new heads, I'd be discussing with Brodix a warranty repair at least, preferably replacement head....Sounds like you got a soft head

quote:

Originally posted by imakehp:
Sounds like you got a soft head

Then why the tuliped & elongated valves?

I wouldn't think a free rev to 8000 would be good on it. Don't know boats and haven't run hydraulic valve trains in years so I could be wrong.

quote:

Originally posted by Lincoln:
I wouldn't think a free rev to 8000 would be good on it. Don't know boats and haven't run hydraulic valve trains in years so I could be wrong.

^^^This^^^

Not enough timing advance.?
That's a lot of spring pressure, in my opinion.

Not totally related but Ihad a similar problem long ago. Valve job was good for 1, maybe 2 laps. Seats were moving but why was the question.

I installed thicker and deeper seats darn near hitting water. Helped but still could see movement. I also had some valve train issues that made no sense.

In desperation I changed cams from the super trick cam dynamics that ran really well but not long for the above reasons. All issues went away with the new cam which ran better. Most likely to not abusing the above.
The CD cam was allowing the valves to slam shut violently like a lawn mower was the final verdict.

quote:

Originally posted by BD104X:

quote:

Originally posted by imakehp:
Sounds like you got a soft head

Then why the tuliped & elongated valves?

When you lose a seat the combustion feely flows past the valve exposing it to constant excess heat...Also the valve doesn't make contact with the seat any longer which a major source to rid the valve of heat by contact...And an intake valve isn't made to run that hot, so it softens and starts distorting.....Anyhow that's my opinion(s)