detonation damage

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detonation damage

Post  rmk57 on November 12th 2015, 1:05 pm

I guess there's no saving these? No special coatings out there.

The quench pad also has a few marks to. Could these be welded and then surfaced again?ser/rmk57/media/IMG_1969.jpg.html][/url]

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Re: detonation damage

Post  kim on November 12th 2015, 1:35 pm

Heads are easily repairable, depending on desire, a few .001 milled and viola, good as gold. Otherwise, some welding and a quick mill to regain surface true will take less off.

Pistons.. cheaper to buy new than try and fix as far as I know. Pulling truck?????

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Re: detonation damage

Post  rmk57 on November 12th 2015, 4:09 pm

No, its in a 1970 Mustang.

I have to be very careful of milling because of the O-rings not seating deep enough in the receivers

if too much material is taken off.

I did a bit of research and looks like Diamond is the only replacement piston I can get for it.

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Re: detonation damage

Post  kim on November 12th 2015, 4:26 pm

Your best bet,  weld the holes and the o ring groves, mill flat.  Don't go back to the O rings.   I've got em, whish I didn't next build wont.
Wait for Randy Malik, Lem, etc to weigh in.  Someone in the macineshop and building world.

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Re: detonation damage

Post  rmcomprandy on November 12th 2015, 7:07 pm

That is not merely detonation damage as something went through it, also.

Don't worry about those minimal pits in the heads; just be sure they are flat.

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Re: detonation damage

Post  rmk57 on November 12th 2015, 7:32 pm

The piston pictured is the worst of the eight, the others are not near as bad so maybe something did go through it.

Not sure if it came this way from the factory but one head is a C9AE and the other is D0OE. Could be a warranty thing

or it may have come that way, it is a late production car.

The engine hasn't been apart since 1981 and it never leaked coolant or oil so I may just keep it original, as I do have

a complete set of O-rings.

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Re: detonation damage

Post  Frank Merkl on November 12th 2015, 8:07 pm

I personally wouldn't worry about the damage to the head , that thing eat something at one time in it's life !
Frank
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Re: detonation damage

Post  maverick on November 12th 2015, 8:16 pm

Frank Merkl wrote:I personally wouldn't worry about the damage to the head , that thing eat something at one time in it's life !
Frank

Maybe one of those cute little screws attaching a throttle blade to the shaft?
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Re: detonation damage

Post  rmk57 on November 12th 2015, 8:27 pm

I thought that the pits or sharp edges like that would promote detonation.

So if this was to driven normally it would be ok to just reuse what I've got

or bore it and get new pistons.


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Re: detonation damage

Post  dfree383 on November 12th 2015, 9:43 pm

Honestly for your not racing and beating the day lights out of it.... You could just polish the Pistons lightly and run it. IMO
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