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Engine - Turbo & Block Modifications and upgrades to maximize your Dodges turbo output & Improving strength and durability - pistons to crank.

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Old 01-14-2013, 03:06 PM   #1
Mahle Piston Rings  
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The Mahle 41422CP has been my ring of choice for my 8v turbo builds in past years. The sets are plasma-moly ductile iron. Mahle has also had a "standard" ring set for the 8v turbo available, 51422CP(plain cast iron). I recently was informed that the 41422CP ring sets are no longer being produced by Mahle, they are discontinued. The Mahle catalog now shows 41286CP rings as taking the place of the 41422CP rings. This comes as a surprise to me because the 41286CP ring has always been the "premium" N/A engine ring set. Those sets are plasma-moly cast iron. Which in my opinion would still be better to run in a turbo engine than the Mahle catalog listed, "standard" 8v turbo 51422CP, plain cast iron rings. Any thoughts on this matter people?
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Old 01-14-2013, 06:19 PM   #2
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Perfect Circle has ductile iron moly faced rings for 2.2-2.5's. just installed a set when i was assembling my short block over the weekend. sorry dont have the part number- took out the trash this morning
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Old 01-14-2013, 07:00 PM   #3
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Yes there are a few manufacturers that still produce the ductile moly rings. I have used some of those before as well. But, I have always been partial to the Mahle rings due to oil ring design. So, I am curious as to why Mahle thought it to be okay to discontinue the ductile moly turbo rings and have the cast moly N/A rings supercede them. Interesting.
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Old 01-22-2013, 12:14 PM   #4
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Yes there are a few manufacturers that still produce the ductile moly rings. I have used some of those before as well. But, I have always been partial to the Mahle rings due to oil ring design. So, I am curious as to why Mahle thought it to be okay to discontinue the ductile moly turbo rings and have the cast moly N/A rings supercede them. Interesting.
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Old 01-22-2013, 11:08 PM   #5
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That could be the reason. But the supplier I spoke with says that an N/A ring part #(41286CP) pops up when looking up rings now for a turbo car. Why would Mahle list the N/A ring as a suitable part for the turbo engines?
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Old 01-29-2013, 01:37 AM   #6
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That could be the reason. But the supplier I spoke with says that an N/A ring part #(41286CP) pops up when looking up rings now for a turbo car. Why would Mahle list the N/A ring as a suitable part for the turbo engines?
Probably because they know most cars will be stock boost etc and the rings will hold up, less part numbers equals more profit.
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Old 01-29-2013, 02:35 AM   #7
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Probably because they know most cars will be stock boost etc and the rings will hold up, less part numbers equals more profit.
something that bothers me about this thread, from the machine shop, is that the moly turbo rings were thicker than NA rings. This is something I've gone through with Mahle in the past. It isn't something I've heard anywhere else though. I know Wiesco pistons used an extra thin ring, which isn't what I mean by an NA ring. With other pistons it may not matter, this is something I was told about the Mahle turbo piston.
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Old 01-29-2013, 04:02 AM   #8
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By thinner I am assuming you mean the width, correct?
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Old 01-29-2013, 04:13 AM   #9
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I am not sure, I still think a rings width is based off the bore diameter. Thickness is between ring lands in the grooves. Like the gaps in the pistons are wider for turbo pistons than NA pistons. This is one of those I heard it but I didn't test it type things lol. So if anyone has measured this I'd like to know.

The machine shop told me I have to use Mahle piston rings with the turbo pistons as they were thicker. I bought regular rings for turbo pistons that were the zero gap type. They were sloppy in the pistons and that was the explanation I got. I also just re ringed a 2.5 of mine that had new Sealed Power rings in it that hit boost cut out. The top rings were all busted to pieces. I am beginning to worry about not getting Mahle rings anymore. Maybe I'm nuts but I am trying to over haul my engines more are getting good cheap pistons isn't an option anymore.
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Old 01-29-2013, 02:57 PM   #10
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According to the Mahle catalog, the ring sizes of the 41422CP and 41286CP are identical. 1.5mm 1st & 2nd ring, 4mm Oil.
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Old 02-08-2013, 01:45 AM   #11
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According to the Mahle catalog, the ring sizes of the 41422CP and 41286CP are identical. 1.5mm 1st & 2nd ring, 4mm Oil.
Correct, 8 valve stock pistons, JE's, Venolia's use the 1.5, 1.5, 4.0 mm rings, TIII's use 1.5, 1.5, 3.0 mm ring set. SRT's and Wiseco's use a skinny ring pack and they seem to hold up.
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Old 10-18-2013, 07:28 AM   #12
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I'm getting ready to order some rings and came across this post. So what is the ring of choice here since the 41422cp ring is no longer being produced. I'm hanging a set of 2.5 turbo pistons on some 198 slant six rods and installing them in a 225 block, but I've been holding out on ordering a ring set because I was unsure what to use now any and all help is appreciated

Also I've heard that the camry 3.0 uses the same ring sizes has anyone tired a set of these

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Old 01-21-2014, 02:10 AM   #13
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Any name brand works, IE Perfect Circle, NPR, Hastings, Sealed Power and yes, the 3.0L 90's Toyota V6 work, IE Camry.
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