RX7_ARG

Hi people, we´re rebuiding a sa22c and we`ve this housings, they`re reusable?

they have 4mm chrome flaking, this motor was running with good compression but this is what we got now:

j9fd3s

how long were you planning on that to last? it will run ok for a while, but its not gonna last a long time

HeffSpooled

That's way too much chipping.

j9fd3s

i had a 12a that ran great, it would start just by tapping the key, i took it apart to fix the dowel pin oil leak and there was almost no chrome left at all!

heretic

I believe it. You'll not find a modern piston engine that doesn't have a plain iron or high-silicon aluminum cylinder bore, but in WWII it was common practice for cylinders to be hard chromed similar to how rotor housings are done. Wasn't absolutely necessary, but longevity was key, and engines were expected to last well beyond their MTBO. Wouldn't want an engine failure to be the thing that caused a plane to go down that caused a mission to fail that caused a battle to be lost that turned the tide and lost the war.



I bet your engine would have continued running fairly well until it wore through the sheetmetal insert. After that, the aluminum would rapidly die, with the expected consequences.

guitarjunkie28

i wouldn't use those, but if you decide to, you might think about hurley apex seals. they've got a huge corner piece and it'd help keep it out of that groove.