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Aluminum 901/05 Engine Case Tumble-Polished: Perfection Defined

I'm going to keep it to a few words and let the photos speak.

Ollies Automotive Machining has tumble-polished this aluminum engine case in ceramic media. Following this step, the oil gallery plugs were removed and the oil galleries cleaned to ensure that no media remains in the case. The media tumble was $100, hot tank was $30 and the R&R of the oil plugs was $60.00. I had a few other things done while it was there, like the case squirters you see below.

EDIT: Since this was posted Ollies moved to Lake Havasu, http://www.olliesmachine.com/


Enjoy!







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Last edited by 304065; 10-09-2011 at 09:44 AM..
Old 06-08-2007, 04:27 PM
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'66 911 #304065 Irischgruen
Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13)
Ex-'88 Carrera (Sold 3/29/02)
Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04)
Old 06-08-2007, 04:29 PM
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Wow John that is pretty!!
Seems to be reasonable pricing too....
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Old 06-08-2007, 04:35 PM
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Mama !

What have you decided to build John ?
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Old 06-08-2007, 05:13 PM
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Very nice John. Engine porn for sure. Maybe just soft porn, at this stage, but engine porn, none the less.
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Old 06-08-2007, 06:32 PM
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Gentlemen,

Coming from you fellows, (a '66 owner, a '67 owner and a '66 owner!) that's high praise. Thanks-- I think they did a very nice job.

The build plan is final: The engine will be a completely stock appearing 1966 901/05, but will be 81x66, 9,3:1 compression with an improved version of Solex cams, SC oil pump, ARP bolts, and every internal update the factory offered, such as squirters and the oil bypass modification. Carburetors will be the stock Weber 40IDA.

I'm hoping for better than 140 HP with SSI '67-style heat exchangers and a quiet muffler.
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Ex-'88 Carrera (Sold 3/29/02)
Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04)
Old 06-09-2007, 09:04 AM
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Can't wait to see the progress.
I just put SSI's on my car and the difference is amazing.
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'67 901/05 rebuilt 2.2
Bultaco Metralla 62 "exDina"
'68 BMW R69S
Old 06-09-2007, 01:25 PM
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What is a case squirter?
Old 06-09-2007, 04:21 PM
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Quote:
Originally posted by fly4val
What is a case squirter?
squirts oil under the piston for improved cooling
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Old 06-10-2007, 06:49 AM
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The case looks fantastic. Far better than what I managed with my steam cleaning and elbow grease.

When they did this did they have to protect the case mating surfaces from the ceramic media?

Kirk
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Old 06-10-2007, 09:17 AM
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Hey John how did the align-bore check out was it still spec?
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Old 06-10-2007, 05:54 PM
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John;

Aren't you being a little conservative with the #'s ?
You could get 140hp with a 901/05 by just removing the restrictors on the heat exchangers.
You should do better than that with 9.3 compression and hotter cams , no ?
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Old 06-10-2007, 05:58 PM
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John,

What was shipping from NYC? I have waffled between sending mine and just putting the elbows on it...

Best regards,


Michael
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Old 06-10-2007, 06:43 PM
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Align-bore was checked and found within specifications.

Yes, I am being very conservative. I had SSIs before which didn't have any restrictor rings, so no changes there. The combination of higher compression and the improved cams should provide an improvement, but I'm not expecting TOO much insofar as I'm still using 39/35 valves with 32mm ports. Remember, the 901/30 rally engine used 39/35 valves, 32mm ports, "S" pistons and cams and 46 Webers and delivered 150HP. We still don't know what the torque curve looked like as it, and the torque peak value were never published as far as I can tell.

Michael, shipping via DHL (the carrier of choice for all things Porsche, and I'll admit that the RS Spyder's sponsor has a lot to do with it) was about $55 from New York City. Shipping back was $90, for a 70 pound box with copious amounts of cardboard to protect it.
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Ex-'88 Carrera (Sold 3/29/02)
Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04)
Old 06-11-2007, 06:00 AM
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John;

Are you going to go with 32mm venturis ?
130 main jets ?
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Bultaco Metralla 62 "exDina"
'68 BMW R69S
Old 06-11-2007, 06:07 PM
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I love seeing a sandcast 2.0 on a granite countertop. John I think your engine will be worth more than 140hp. Mine has a bit more than what you are planning such as a port and polish and a crank fire ignition, a bit more compression and my displacement was taken out to 2200cc's and I think the engine has 180hp. You should be at no less than 160 with your setup. Regardless of that, you have a beautiful case to work with. That is how mine was done too.
Old 07-03-2007, 05:19 PM
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John have you ever thought about blasting the housing with dryice ?

bob

http://corvair.webdrache.ch/sccmcms/restore/karosserie/140.php


Old 07-22-2007, 07:50 AM
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Quote:
Originally Posted by HKZ Bob View Post
John have you ever thought about blasting the housing with dryice ?

bob

http://corvair.webdrache.ch/sccmcms/restore/karosserie/140.php


How and where can you get that done
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Old 07-27-2007, 08:31 PM
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try this link

http://corvair.webdrache.ch/sccmcms/restore/karosserie/140.php
Old 07-28-2007, 11:49 PM
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WOW!!! is there an english version of this???? Is that a totally cool way to clean away yrs/miles of crud or what!!!!!!!!!!!!!!!!!
Is this available in the US?? Is this the dry ice thing?
Bob
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Old 07-29-2007, 05:08 AM
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Old 07-29-2007, 05:08 AM
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