Quote:
Originally Posted by My5ABaby
This heat problem also leads to cracks around the spark plugs when someone takes the revs too high on a cold engine. Just a side note...  |
I never load the engine cold. I wait for 80˚C before boosting and always use at least a 2 minute cool-down before shutting down (a habit from working on turbine engines which is their requirement).
So I think the cracking has to be just high heat from poor cooling in that area.
The housing with the cracks didn't have the 3rd gen housing cooling mods, but both housings were lifting in the spark plug area. Notice the carbon stains to the side of the hole.
I have a theory that this lifting of the apex seal and jamming of the triangle tip is what breaks the seal in some cases without detonation being present. I found one unbroken but cracked apex seal. It was cracking from the bottom! I visualized them breaking from the top.
Barry