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TedzBug
Samba Member
Joined: May 26, 2004
Posts: 272
Location: Michigan, USA
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 Posted: Fri Aug 23, 2013 10:49 am Post subject: Question on used Forged Mahle pistons and Cyls |
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So... I picked up these 90.5 forged mahles with the impression they were in "good" condition...
I'm wanting to build a mild turbo, also got a hold of a used forged CW 69mm crank.
What do you think of these? Was this a bum deal, or are they worthy of running? Cylinders have been honed, told they were round...
Thanks guys
Ted
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Cusser
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Joined: October 02, 2006
Posts: 33085
Location: Hot Arizona
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mcmscott
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Joined: March 12, 2010
Posts: 4927
Location: sanger ca
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| Posted: Fri Aug 23, 2013 11:30 am Post subject: |
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I'd hate to see what poor condition is!
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jfats808
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Joined: December 10, 2007
Posts: 5022
Location: oahu hawaii
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| Posted: Fri Aug 23, 2013 12:14 pm Post subject: |
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Looking at the pictures, the cylinders werent honed unless you did them later. A valve guide appears to have let go from the multiple valve hits a valve head put on the piston top or something round hit the piston top on one. Something, guide material or a ring disintegrated and ruined the side top of the piston pictured. I wouldnt be surprised if low level oil and or extreme heat conditions were part of the culprit. The cylinder pictured has deep gouges that no honed job will fix. Its a bum deal. Go out and buy 150$ AA 90.5 set of p/c's and dont look back. P/C's are one of the cheapest parts to replace with new of the whole engine.
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2276 IDA's 86C 11-1 DD
| Rockstar Suzuki wrote: |
You might as well put 10 year build in your bullshit sig, as it will NEVER run. Also your a dick |
You can always learn something new, even from a fool.
Check your oil levels routinely! |
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TedzBug
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Joined: May 26, 2004
Posts: 272
Location: Michigan, USA
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jfats808
Samba Member
Joined: December 10, 2007
Posts: 5022
Location: oahu hawaii
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| Posted: Fri Aug 23, 2013 12:59 pm Post subject: |
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Lol sorry, i forget sometimes that "my price" isnt the same as "others prices".
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2276 IDA's 86C 11-1 DD
| Rockstar Suzuki wrote: |
You might as well put 10 year build in your bullshit sig, as it will NEVER run. Also your a dick |
You can always learn something new, even from a fool.
Check your oil levels routinely! |
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TedzBug
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Joined: May 26, 2004
Posts: 272
Location: Michigan, USA
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scotth17
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Joined: January 30, 2012
Posts: 335
Location: Bedford Texas
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| Posted: Fri Aug 23, 2013 1:22 pm Post subject: |
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| If you have one of each in good condition, I have 3 more in good condition you could have for postage.... |
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AlteWagen
Troll
Joined: February 23, 2007
Posts: 8699
Location: PNW
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| Posted: Fri Aug 23, 2013 3:20 pm Post subject: |
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| Are cast AA up to turbo use? |
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esde
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Joined: October 20, 2007
Posts: 6333
Location: central rust belt
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| Posted: Fri Aug 23, 2013 4:48 pm Post subject: |
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I have had a few pistons that looked like that, and considered using them.
The ring lands take a beating when junk like that gets caught and ground into the cylinder. The rings might be tight, on top of the "obvious" problems. |
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modok
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Joined: October 30, 2009
Posts: 27664
Location: Colorado Springs
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| Posted: Fri Aug 23, 2013 5:06 pm Post subject: |
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| Measure skirts. Dial bore gauge cylinders. Check ring grooves. Then we decide. If he just flex honed the cylinders that doesn't really DO much. |
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mark tucker
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Joined: April 08, 2009
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Location: SHALIMAR ,FLORIDA
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| Posted: Fri Aug 23, 2013 5:10 pm Post subject: |
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| junk |
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modok
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Location: Colorado Springs
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| Posted: Fri Aug 23, 2013 5:13 pm Post subject: |
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| yeah, probably, but they should learn to look with their micrtometers instead of their eyeballs. |
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Clatter
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Joined: September 24, 2003
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Location: Santa Cruz
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| Posted: Fri Aug 23, 2013 5:30 pm Post subject: |
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LOL Glenn...
There might be three good ones there,
But you can't measure them over the Internet FFS!
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Dr OnHolliday
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Joined: May 11, 2012
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Location: was Escondido now San Berdoo
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| Posted: Fri Aug 23, 2013 9:51 pm Post subject: |
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Well, the ugliness above the top ring groove is irrelevant because its not a bearing surface. But given the engine size and assuming it'll probably be hammered on, I don't see cutting corners.
Which kinda reminds me of a factoid about Mickey Thompson...early on he saved up to buy a boring bar, so that he could bore each cylinder in his racing Ford flatheads to fit the used, non-matched pistons that he pulled out of the Ford dealers trash bins....
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Altema
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Joined: June 20, 2010
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Location: Lower Michigan
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| Posted: Fri Aug 23, 2013 11:13 pm Post subject: |
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I'd be more concerned about the cylinder scoring than the piston blemish, especially with the higher cylinder pressures of a turbo. I would use those PC's for a spare engine or local daily driver, but not for a performance build.
If it was mine, I'd put them on the shelf for emergency spares and get something else.
Paul |
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TedzBug
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Joined: May 26, 2004
Posts: 272
Location: Michigan, USA
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| Posted: Sat Aug 24, 2013 6:24 am Post subject: |
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seller response this morning:
"If you want to send me the two pistons that are questionable I will be happy to send you two that are good. I have several spares and am getting rid of all of my 90.5 stuff. I have used several sets of these used pistons and cylinders with no problems. The cylinders have been honed and are straight.
Thanks,"
I may just ship the whole mess to him and eat it.
I want a reliable engine and am realizing the path ive been traveling wont produce that.
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aryue
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Joined: January 16, 2006
Posts: 1027
Location: Austin, TX
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| Posted: Sat Aug 24, 2013 6:46 am Post subject: |
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That sounds like a response from GEX. Either the seller has very low standards on his own builds - or - he's trying to make a fast buck with parts that he knows to be questionable.
- Andrew in Austin, TX -
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juki48
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Joined: March 07, 2007
Posts: 602
Location: Upstate NY
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| Posted: Sat Aug 24, 2013 7:07 am Post subject: |
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| sounds like the seller is trying to be fair, just has different standards than you and me. I would ask if you can return them all for a full refund and find something else. |
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TedzBug
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Location: Michigan, USA
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