 Rebuild question - reuse 2.0 Mahle pistons? |
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| stevegm |
 Oct 16 2016, 03:19 PM
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#1
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Advanced Member  Group: Members Posts: 2,111 Joined: 14-July 14 From: North Carolina Member No.: 17,633 Region Association: South East States 
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I am getting ready to rebuild a 2.0 liter four, which happens to have Mahle pistons and cylinders. I know Mahles are really good, and it seems like they would be better than most aftermarket P&C. So, assuming they are in good condition, is it recommended to reuse them? If so, just use new rings? Has anybody here reused theirs in a full rebuild?
This engine is being built for durability for One Lap of America. Suggestions? I know AA P&C have had mixed reviews. If it is not recommended that the Mahles be reused, what is recommended? |
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| injunmort |
Oct 16 2016, 03:43 PM
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#2
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Senior Member Group: Members Posts: 1,024 Joined: 12-April 10 From: sugarloaf ny Member No.: 11,604 Region Association: North East States |
if they are undamaged, i would reuse them and re ring. having said that, i would measure very carefully bore and piston/wall clearance. if within spec you should be golden.
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| Mblizzard |
Oct 16 2016, 03:45 PM
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#3
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Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
Steve I am sure there are many here that are much smarter than I am, but if there are no issues with the Mahle P&Cs there is no way I would replace them. Ring those bad boys and run them!
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| Rand |
Oct 16 2016, 03:50 PM
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#4
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
I figure re-usable is determined by the specs. Can't judge it on general chat. I'd want each piece to be measured and know it's in spec.
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| porschetub |
Oct 16 2016, 06:10 PM
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#5
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Advanced Member Group: Members Posts: 4,708 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Get the ring lands carefully measured ,wear on the outside of the pistons is usually very obvious to the eye,yep they are great pistons so if good you can get the barrels honed and pistons reringed ,get the best rings you can buy and you will be golden (IMG:style_emoticons/default/biggrin.gif)
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| SKL1 |
Oct 16 2016, 06:22 PM
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#6
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Senior Member Group: Members Posts: 1,610 Joined: 19-February 11 From: north Scottsdale Member No.: 12,732 Region Association: Upper MidWest
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I rebuilt my '73 2.0 a couple years ago. It had about 70K miles on it. P/C's looked fine. Used new rings, bearings etc. Worked out fine. I too figured even with 70K miles they were better than most aftermarket stuff.
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| porschetub |
Oct 17 2016, 02:45 AM
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#7
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Advanced Member Group: Members Posts: 4,708 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
(IMG:style_emoticons/default/agree.gif) ,next question why did Mahle stop making kits out of Brazil for T4 and 911 motors ,find it hard to see why,huge demand still and they just STOPPED,maybe someone knows cause I find it odd.
I used this stuff for years and no problems,not on T4's but on T1's never had an issue so why are the good old days better??? So now we have a mix of Chinese componants and USA made parts to get it right and supply the market (IMG:style_emoticons/default/dry.gif) . |
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| KeithVonLaws |
Oct 17 2016, 02:59 AM
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#8
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Member Group: Members Posts: 57 Joined: 19-July 16 From: Napoleon , Ohio 43545 Member No.: 20,205 Region Association: North East States |
I have reused pistons and cylinders . Pay close attention to cylinder wear as others have noted. I would use a deglazing hone on the Bores. And if your going to clean your pistons.... never glass bead or sand blast the ring grooves or ring lands. I am going to rering a 1.8 here soon myself for my Sons car.... Good luck
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| moorepower |
Oct 19 2016, 08:21 AM
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#9
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Member Group: Members Posts: 55 Joined: 9-May 15 From: eastern Nebraska Member No.: 18,718 Region Association: Upper MidWest |
Never glass bead pistons period. Lokk at one after glass beading with a magnified lense. The glass breaks and imbeds in the piston.
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