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> 904 Mainshaft, ...did I just stumble on one?
yeahmag
post Mar 17 2014, 03:50 PM
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Might this be the elusive 904 mainshaft? i just picked up about 7 901 cores and this was in one of the boxes of random parts.

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tscrihfield
post Mar 17 2014, 04:02 PM
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Yes, that appears to be a 904 main shaft.
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tscrihfield
post Mar 17 2014, 04:03 PM
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But it looks to be a little rough!
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yeahmag
post Mar 17 2014, 04:07 PM
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It's quite dirty. Other than that it looks passable to me. I'd have to have Dr. Evil to look at it to know for sure.
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Qarl
post Mar 17 2014, 05:12 PM
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QUOTE(yeahmag @ Mar 17 2014, 06:07 PM) *

It's quite dirty. Other than that it looks passable to me. I'd have to have Dr. Evil to look at it to know for sure.


Looks like the one I had...

(IMG:http://www.914world.com/bbs2/uploads_offsite/dl.dropboxusercontent.com-271-1395097985.1.JPG)
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yeahmag
post Mar 17 2014, 05:53 PM
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I'm probably not gonna use this thing as I can't afford to build a box of the caliber.
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Cap'n Krusty
post Mar 17 2014, 06:18 PM
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I was wondering where I left that thing .........................

The Cap'n
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Woody
post Mar 17 2014, 06:51 PM
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I'll give you $50 to send it to me so I can verify. (IMG:style_emoticons/default/happy11.gif)
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toolguy
post Mar 17 2014, 06:58 PM
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put it on a lathe a turn slowly and see if it has any runout. . since these were used on 'performance' motors, I've seen more than a few that have bow in the gear stack area. . just a smidge will make the gears mesh too tight on one side and loose on the other. . If it's straight you hit the jackpot, plus see what the gears were in the transmission it came out of. . you might have a nice setup ready to go. .
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boxsterfan
post Mar 17 2014, 09:41 PM
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How much do these 904 mainshafts go for?
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jaxdream
post Mar 17 2014, 09:45 PM
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About a 915 ???!!!! (IMG:style_emoticons/default/confused24.gif) (IMG:style_emoticons/default/confused24.gif) (IMG:style_emoticons/default/stirthepot.gif) (IMG:style_emoticons/default/stirthepot.gif)

Jack
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Qarl
post Mar 17 2014, 10:33 PM
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QUOTE
How much do these 904 mainshafts go for?


I think I sold my NOS 3 years ago for $1350
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Qarl
post Mar 17 2014, 10:41 PM
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QUOTE(Qarl @ Mar 18 2014, 12:33 AM) *

QUOTE
How much do these 904 mainshafts go for?


I think I sold my NOS 3 years ago for $1350



http://www.ebay.com/itm/PORSCHE-COMPETITIO...=item3cdb7b6429
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yeahmag
post Mar 18 2014, 10:48 AM
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So, I'll be eyeballing this thing on the lathe in the next few days to see how the runout is. After that it goes up for sale. Daddy needs a new set of tires... ;-)
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Katmanken
post Mar 18 2014, 08:40 PM
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Straightening a shaft ain't no big thing. I used to get large quantities of precision diameter steel shafts (centerless ground) and straight to half a thousandths.

Watched the ladies do it too. They slapped a shaft on a fixture, spun the shaft while looking at the dial indicator and whammed the shaft with the press when the high side was under the press.

Some fixtures had 1 press at the center, and some 2 presses at the 1/3 and the 2/3 points on the shaft. They could straighten a shaft in under 30 seconds. Wham, wham, wham.....


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Dr Evil
post Mar 18 2014, 09:25 PM
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Dang, wish I found a 904 shaft in the pile. Shit, I wish I had a pile. West PA is a suck pocket for cores and 914 stuff.
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stownsen914
post Mar 19 2014, 10:44 AM
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Got any 2nd gearsets to go with that thing? They're valuable too. I got a couple sets in a lot of 901 gearsets I bought a few years ago. We get lucky every once in a while ...
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ldsgeek
post Mar 19 2014, 07:32 PM
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QUOTE(Katmanken @ Mar 18 2014, 06:40 PM) *

Straightening a shaft ain't no big thing. I used to get large quantities of precision diameter steel shafts (centerless ground) and straight to half a thousandths.

Watched the ladies do it too. They slapped a shaft on a fixture, spun the shaft while looking at the dial indicator and whammed the shaft with the press when the high side was under the press.

Some fixtures had 1 press at the center, and some 2 presses at the 1/3 and the 2/3 points on the shaft. They could straighen a shaft in under 30 seconds. Wham, wham, wham.....

They straighten gun barrels the same way, only they don't use the dial indicator. They look through the bore to find a shadow and use that to figure out where to straighten.
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yeahmag
post Apr 14 2014, 08:07 PM
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She's straight! Over the entire length we measured no more than .0015"

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yeahmag
post Apr 14 2014, 08:09 PM
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We measured in 5 spots along the shaft and all look great. Gave the journals a bit of a polish and put her away.
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