89 heads after sitting intercooler and coolant fluid for 10 years
From Andy Keel supercharged vehicle with failed intercooler leak that sat for years.
I'll see if my go to head rebuilders can fix these. PS head https://cimg6.ibsrv.net/gimg/rennlis...d7c10e9d72.jpg https://cimg2.ibsrv.net/gimg/rennlis...04f47ba4d5.jpg https://cimg6.ibsrv.net/gimg/rennlis...646bf4be97.jpg https://cimg3.ibsrv.net/gimg/rennlis...6fa810d929.jpg https://cimg5.ibsrv.net/gimg/rennlis...6a2cef99fd.jpg DS Head https://cimg5.ibsrv.net/gimg/rennlis...c790d8cf69.jpg https://cimg8.ibsrv.net/gimg/rennlis...20077d2d62.jpg https://cimg3.ibsrv.net/gimg/rennlis...faa376296c.jpg https://cimg2.ibsrv.net/gimg/rennlis...a1d692a34f.jpg https://cimg7.ibsrv.net/gimg/rennlis...359fcd3e8b.jpg |
Following. Kevin, how do you think they'll be able to clean up the valve seats?
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A little welding and a few valve seats should take care of those, right?
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Compared to 3 of 4 sets of heads I’ve pulled in the last 18 months, those look fabulous. |
Originally Posted by GregBBRD
(Post 15636332)
A little welding and a few valve seats should take care of those, right?
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Did you sand blast those to get them that clean? Some of those valve seats look a bit rough.
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Originally Posted by Rob Edwards
(Post 15636357)
Did you sand blast those to get them that clean? Some of those valve seats look a bit rough.
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I would say to go ahead and replace all seats when they are welded up.
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Originally Posted by Kevin in Atlanta
(Post 15636345)
8.50 a seat plus welding.
I can't see into the ports. Is the aluminum eroded under the valve seats enough that they need to weld there, too? |
Originally Posted by GregBBRD
(Post 15637137)
That sounds about right. Just make sure they use intake and exhaust seats made from the correct material, so the seats do not wear rapidly. I used to purchase factory oversize seats and furnish them to my machinist, but he did not like those seats and now furnishes his own when we need to replace seats.
I can't see into the ports. Is the aluminum eroded under the valve seats enough that they need to weld there, too? |
Glass beading
I think I've heard several times that welding up aluminum, after it's been glass beaded, makes for a major PITA... something about microscopic glass embedded into the surface... but I'm not a welder... Ken
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Originally Posted by Kaplan69
(Post 15638276)
I think I've heard several times that welding up aluminum, after it's been glass beaded, makes for a major PITA... something about microscopic glass embedded into the surface... but I'm not a welder... Ken
Back 50 plus years ago carbon tetrachloride, was the best solvent for cleaning aluminum, it's banned. Today it's acetone and alcohol. You gotta prehead the hell out of aluminum. Welding aluminum is a skill, just takes patience and time to learn to do it correctly. I have a purge box, and use helium as a backing gas. |
That corrosion isn't bad, it actually looks fairly normal for a 928 head. Most that look worse than that are saved, especially the 89+ heads that aren't prone to cracking.
Just have your machinist pop in a new set of seats, have them cut, do some welding, deck the heads to the correct RA and away you go. Now would be the time to port match the intake to the heads as well :) |
Originally Posted by The Forgotten On
(Post 15640348)
That corrosion isn't bad, it actually looks fairly normal for a 928 head. Most that look worse than that are saved, especially the 89+ heads that aren't prone to cracking.
Just have your machinist pop in a new set of seats, have them cut, do some welding, deck the heads to the correct RA and away you go. Now would be the time to port match the intake to the heads as well :) |
Back today - all the seats were replaced, the head welded and the heads themselves barely skimmed.
They also assembled the heads with the new springs, retainers and centering discs. https://cimg1.ibsrv.net/gimg/rennlis...110b3e6c92.jpg https://cimg5.ibsrv.net/gimg/rennlis...98e35c5387.jpg |
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