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Greg Gordon · Post by **Greg Gordon** » Thu Sep 13, 2007 12:29 pm

Hmm, I found this hole in the combustion chamber when taking apart a customer's 2.5. My father says it's a casting irregularity which is probably true. The hole is about dead center in the photo below.

I am a little concerned because this hole is about 2mm deep! What do you guys think? Should it be ground out and filled in somehow? If left as is will those sharp edges promote detonation?

This is a low mileage motor with a colorful history.

Greg Gordon

Mats · Post by **Mats** » Thu Sep 13, 2007 12:53 pm

Probably casting stuff, ejection pin or something.

x-rad · Post by **x-rad** » Thu Sep 13, 2007 3:36 pm

a poor casting...or someone lost a screw...

Mats..I would put fill branches (cut off pins}or eject at a place where you are going to drill out for some kind of plug or something..chamber dome is odd place..

you can have theis welded in by a "competent" aluminum welder

I have seen many racing heads re-welded and ground and they turn out fine....

Barry · Post by **Barry** » Thu Sep 13, 2007 8:18 pm

Hi Greg...Yes,Id also fill it in..
Id use a pin punch and a slug of some ally and fill up that hole.
Once you have knocked it in with the punch,it going no where..

Greg Gordon · Post by **Greg Gordon** » Fri Sep 14, 2007 4:29 pm

Thanks guys,
We are going to fill it in.

Greg

x-rad · Post by **x-rad** » Fri Sep 14, 2007 5:29 pm

being that there are fewer and fewer heads...sounds like a good idea

Greg Gordon · Post by **Greg Gordon** » Sat Sep 15, 2007 3:44 pm

Exactly, this is a minor problem and it´s not worth throwing away an otherwise perfectly good head. I am sensitive to the decreasing number of good cores.

A HOLE in the combustion chamber, what the heck???