Prop strike engines

[Raymo]

Originally Posted by tspear

Why? (Both why not sell, and why would they want it without the log book)

Tim

The buyer would have likely put the engine on a certified plane and went flying or sold it to an unknowing buyer.

As an A&P mechanic (mostly Blackhawk experience but drinking from the hose of knowledge every day), I could not have that on my conscience.

[tspear]

Originally Posted by Raymo

The buyer would have likely put the engine on a certified plane and went flying or sold it to an unknowing buyer.

As an A&P mechanic (mostly Blackhawk experience but drinking from the hose of knowledge every day), I could not have that on my conscience.

Raymo,

Agree. Just never even occurred to me. I am probably a little naive in the bending/breaking rule aspect.

Tim

[Bevan]

Originally Posted by tspear

Oh ****. I did not think of that. It never even occurred to me.

Tim

And likely the liability will come back to the person who neglected to make the log book entry.


Bevan

[BobTurner]

Originally Posted by tspear

Raymo,

Agree. Just never even occurred to me. I am probably a little naive in the bending/breaking rule aspect.

Tim

Unfortunately true. Some ads say "No damage HISTORY". With no log entry, there's no "History".

[BCP Boys]

If you are looking to buy an engine that has had a Prop strike and hasn't been tore down, then you have to consider that engine as core value only. I know some here will disagree but if you want to be safe then consider making an offer to the seller for core value only.

[az_gila]

And that core value is only valid if the crank checks out OK.

[Marc Bourget]

An unmentioned issue is what is the proper way to check the crank.

A friend of mine is a long time auto engineer. He was on several initial design team for new OEM engines in Detroit.

The generally unknown factor that leads to a wide variance in damage is the timing of the strike. If the prop contacts almost anything just as a cylinder firing pulse lights off, the loads go to Valhalla.

A 3000 amp Magnaflux machine may check to about a depth of .375", but it was easy with prop strikes to develop fracture planes deeper than that.

He would not use a "prop strike" crank unless it had been examined with an industrial X-ray machine.

YMMV

[maniago]

Originally Posted by jibby212

I have been searching for an o360 for my rv7 and have found many which have had a prop strike. There is a o360 a1a WITH 346 SMOH for 12950 on Barnstormers but it has had a prop strike, flange dials good but I have a feeling that don't mean a lot. I'm thinking I should stay away from these engines but any professional opinions would be appreciated.

From my 3yrs search for a 360 motor, $12950 is in the range of acceptable prices for a used motor with good books, good oil analysis and recent run history and serviceable/useable accessories. With a prop strike its the suckers price. If you want to know the real price its worth, ask a rebuilder (who wont BS you) what hed pay for it. But yeah, drop the zero maybe add 1k to it and youre in the ballpark from what I've heard and seen.

[jibby212]

Thanks for the opinions, I will stay away from these engines for sure. I have a little time yet so I will just keep looking.