Need info On Pistons, Cosworth |
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Need info On Pistons, Cosworth |
914werke |
Jan 25 2011, 10:26 PM
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#1
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"I got blisters on me fingers" Group: Members Posts: 10,040 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest |
(IMG:style_emoticons/default/idea.gif)
Picked up a set of NOS pistons today w/another car bound for the crusher. EXTREMELY light, appear to be forged. they are 94mm for the 2.0L No rings or Pin retainers. I did extensive searches but I cant find any info on them. I need a set of rings and to figure out what if any special instructions might be necessary to install in a set of Mahle barrels. Not sure if the stampings are part #'s or what? [attachmentid=246 676] Attached image(s) |
sixnotfour |
Jan 26 2011, 01:49 AM
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#2
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914 Wizard Group: Members Posts: 10,421 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains |
rich email the electro etched PN on the pin boss to Cosworth , they can help you.
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sean_v8_914 |
Jan 26 2011, 02:12 AM
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#3
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
light pins, what size? what size ring gaps? interesting gas porting
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914werke |
Jan 26 2011, 11:08 AM
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#4
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"I got blisters on me fingers" Group: Members Posts: 10,040 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest |
So I got ahold of Cosworth US in Torrence CA and got as much info as I could.
They were made for Robert Overby of Overby's Porsche service back in the 70's. No longer available product but still in thier archive info. Rings & circlips are still available. 1mm compression rings w/4.03 radial thickness 4mm one piece Goits type oil ring w/ 4.13 radial thickness. 37mm Squish Deck height they told me that they still have a pretty consistent & loyal Aircooled cust. base that was managed by a guy that has now passed (died) shortly ago due to cancer so they no longer have the same level of knowledge or support they once did for this mrkt segment. |
sean_v8_914 |
Jan 26 2011, 11:29 AM
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#5
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
look like a short stroke, perhaps 66mm. I hope Jake chimes in.
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stugray |
Jan 26 2011, 01:07 PM
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#6
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
Ahhh, so you are the guilty party.....maybe (IMG:style_emoticons/default/idea.gif) (IMG:style_emoticons/default/happy11.gif)
http://forums.aircooledtechnology.com/show...35622#post35622 "when you call us asking us how to make Cosworth pistons work in your engine and we tell you that we won't answer that question." (IMG:style_emoticons/default/slap.gif) .....(IMG:style_emoticons/default/unsure.gif) Sorry if I am wrong, the timing was just too funny.... Stu BTW - those would fit my vintage race car nicely! I dont even want to ask what you would want for them ;-) |
Cap'n Krusty |
Jan 26 2011, 01:13 PM
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#7
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
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914werke |
Jan 26 2011, 04:42 PM
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#8
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"I got blisters on me fingers" Group: Members Posts: 10,040 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest |
1mm compression rings w/4.03 radial thickness 4mm one piece Goits type oil ring w/ 4.13 radial thickness. 37mm Squish Deck height "Goits" is spelled "Goetze", FWIW Thanks Cap'n (IMG:style_emoticons/default/rolleyes.gif) Never heard that one before so I took a shot. |
Jake Raby |
Jan 26 2011, 05:02 PM
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#9
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Rich wasn't a guilty party, more of a perfect example for that post..
When I start using Cosworth Pistons in my engines, I'll start selling Cosworth Pistons, then I'll field questions pertaining to them. These do look nice, sorry that I don't know anything about integrating them into a TIV. |
sean_v8_914 |
Jan 26 2011, 05:17 PM
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#10
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
whatcha think of the gas porting on the rings?
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stugray |
Jan 26 2011, 05:20 PM
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#11
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
So if it wasnt Rich, then that means these are fairly common???
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SLITS |
Jan 26 2011, 06:57 PM
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#12
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
As I remember, the advantage of Cosworth Pistons were the metallurgy. We used them (not Porsche or VW) in the race car. The metallurgy allowed for a lessened piston to cylinder wall clearance.
That's from my memory ... we quit racing in 1984. |
sixnotfour |
Jan 26 2011, 09:56 PM
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#13
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914 Wizard Group: Members Posts: 10,421 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains |
considering they are about 35 yrs old 1.0mm compression rings are high performance today even, 4.0 oil ring probably because its a horizontal.
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HAM Inc |
Jan 27 2011, 08:00 AM
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#14
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Senior Member Group: Members Posts: 846 Joined: 24-July 06 From: Watkinsville,GA Member No.: 6,499 Region Association: None |
QUOTE whatcha think of the gas porting on the rings? If you're referring to the ports below the oil ring, those aren't gas ports. I believe they are there to divert pressure and oil away from the oil control ring. Gas ports are used to help force the top ring into the cylinder wall more aggressively. Nice looking set of pistons! |
Mark Henry |
Jan 27 2011, 08:57 AM
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#15
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Stick one pin into a stock piston and the cosworth piston (side by side) and compare the pin height.
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r_towle |
Jan 27 2011, 09:59 AM
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#16
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Custom Member Group: Members Posts: 24,572 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
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maf914 |
Jan 27 2011, 02:59 PM
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#17
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Not a Guru! Group: Members Posts: 3,049 Joined: 30-April 03 From: Central Florida Member No.: 632 Region Association: None |
So I got ahold of Cosworth US in Torrence CA and got as much info as I could. They were made for Robert Overby of Overby's Porsche service back in the 70's. I just did a quick search on Robert Overby. He was a 914 guy, among other cars as well. http://www.racingsportscars.com/driver/pho...Overby-USA.html Did he also race a Porsche 356 in SCCA events? |
914werke |
Jan 28 2011, 01:44 PM
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#18
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"I got blisters on me fingers" Group: Members Posts: 10,040 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest |
Definitely 71mm stoke.But the side by side Pin trick indicates they would be very HIGH compression.
Some deck height manipulation would be necessary. |
Jake Raby |
Jan 28 2011, 09:55 PM
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#19
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
which may mean serious cylinder shims.. Which complicates everything from pushrod tube length to valvetrain geometry to even fitting the stock cooling tin..
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Mark Henry |
Jan 28 2011, 10:11 PM
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#20
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
I thought the pin height looked large that's why I asked.
So exactly how much higher? |
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