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Dean924s's Avatar
Join Date: Dec 2005
Location: MA
Posts: 764
I have them acid etched (I can not think what the correct term is for the process) after they are cleaned up on the Sun machine. The block in the photo was brand new as were the pistons and the crank.

Sanding honing or any other "normal" treatments will make it so your rings don't seal. The etching of the aluminum exposes the aggregate in the aluminum and gives the rings a hard surface to ride on as well as seal to.

Note: I have never sanded the cylinders of any block

Speaking of rings has anyone used the total seal rings? I have not and was thinking of giving them a try in the next motor. Something like a 5-15 percent pick up in the compression.


General Car Specs & Mods
Project Megasquirt 924s
Old 12-19-2005, 06:09 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #41 (permalink)
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Join Date: Feb 2002
Location: 3rd plane of Hades
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Originally posted by ae1969
I have done a couple full rebuilds..... pretty straight forward.

If you have done other engines you will be amazed at some of the details in this engine.
Absa-smurfly! I have lots of pics on the pelican server, so a search, you find tools I fabricated, bad, naughty bearings, rings that couldn't keep it together, and other pics.
*Disclaimer: The person above is actually dumber than he appears.
my web site Torque values maintainance and repairs lots of my rebuild pics weights and measurements
'84 944 auto/ps/ac/cc
'86 951
Providing ignorance one post at a time.
Old 12-19-2005, 07:45 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #42 (permalink)
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Join Date: Dec 2005
Posts: 673
I am oh soooo glad I read this thank you very much for the pre info
splitting my obsessions with a crow bar.
87 DD Black 951 Holset HX40-35 custom garrett turbine, Ford MAF, Rogue tuned,SLM stroker, best ET mph 127
Old 12-28-2005, 10:22 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #43 (permalink)
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sasquatch's Avatar
Join Date: Dec 1999
Location: Emmett, ID USA
Posts: 554
This will pickle your collective noggins. There is a independant repair shop here that specializes in Euro cars, Porsche specifically. Keep in mind when you read this that this shop has a very good reputation with Porsches.

About 10 years ago one of their good customers had a failure in his 86 944 motor and needed a rebuild. The owner of the shop begged the customer to let him try something he had always wondered about, and that was boring the cylinders, honing them, and then using chrome rings right on the bare aluminum cylinder walls.

A deal was struck and the customer said go for it. Last time I checked in with the shop and asked (about a year ago) the customer has over 50k miles on that job and still has excellent compression and leak down numbers. Does not use any oil.

Go figure...

1987 Porsche 944
1974 Porsche 914

"Don't retreat, reload." Sarah Palin
Old 12-31-2005, 02:18 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #44 (permalink)

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