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Old 02-26-2009, 09:58 PM   #1
CHEWY911
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Default Mahle Stroker Piston?

Has anyone used the Mahle stroker pistons in an EJ205 with the STi crank? I was going to to go this route and see if anyone had any opinions or experience with these. The only hesitation I had was that these were 4032 alloy. At my powere levels probably not a big deal, just wanted a little safety margin for any unexpected detonation.
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Old 02-27-2009, 07:19 AM   #2
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I'm also about to head down this path with 2.0l closed deck block and 2.5 sti crank and I'm interested in any reports on the Mahle's as well.
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Old 02-27-2009, 08:34 AM   #3
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they make that piston in both alloys, i have talked to them. the actually gave me both part numbers just dont know where it is
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Old 02-28-2009, 01:40 AM   #4
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Quote:
Originally Posted by seanathanq83 View Post
they make that piston in both alloys, i have talked to them. the actually gave me both part numbers just dont know where it is
Great, thanks for the info! Are there any other manufacturers that make these pistons off the shelf?
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Old 02-28-2009, 01:47 AM   #5
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I built a stroked speC ej20 with these pistons. I never heard back from the buyer, so all I know is that it must have worked. Everything went together as it should have. I took the pistons and block to my mahine shop and had the block bored to fit the pistons.
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Old 02-28-2009, 01:50 AM   #6
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The EASIEST way to tell if you have the correct pistons is to get a used STI 2.5 piston. Then lay the STI piston on its face and lay the stroker piston on its face next to the STI piston. Simply visually compare the pistons. The wrist pin locations should be spot on comparable. Unless you have serious vision problems you will be able to detect the 2mm difference between wrist pin location (stock 75mm pistons are 2mm higher than 79mm pistons).
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Old 02-28-2009, 02:18 AM   #7
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Quote:
Originally Posted by reddevil View Post
The EASIEST way to tell if you have the correct pistons is to get a used STI 2.5 piston. Then lay the STI piston on its face and lay the stroker piston on its face next to the STI piston. Simply visually compare the pistons. The wrist pin locations should be spot on comparable. Unless you have serious vision problems you will be able to detect the 2mm difference between wrist pin location (stock 75mm pistons are 2mm higher than 79mm pistons).
Is it worth going with this set up over a 2.0 with a standard crank? Because I'd prefer to go with Manley or Ross pistons, but they don't make any for a stroker.
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Old 03-26-2009, 11:43 AM   #8
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I've got the motor reddevil is built with the mahles and they seem to be working really well. A little bit of noise and smoke at startup in real cold weather but other than that very quiet for a forged piston. Motor is running good and soon to be tuned.
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Old 03-26-2009, 12:43 PM   #9
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Great to hear that!
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Old 03-27-2009, 04:44 AM   #10
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I am also thinking of going this route. I am interested to get details from any users of this combo.
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Old 03-27-2009, 04:48 AM   #11
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Assembly wise, its as easy as pie.

Take block and pistons to machine shop. Have block bored to fit pistons.

Assemble.

Drive.


Really that simple. You are just swapping the crank and rods, the machine shop does teh "hard part" of boring. Make sure the bearings are good to go, and thats it.
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Old 03-27-2009, 02:00 PM   #12
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Quote:
Originally Posted by seanathanq83 View Post
they make that piston in both alloys, i have talked to them. the actually gave me both part numbers just dont know where it is

sub193642I16, just got off the phone with them.
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Old 09-14-2009, 07:15 PM   #13
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Im using these pistons in my build as well...

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Old 01-27-2010, 07:38 PM   #14
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Where is a good place to get the mahle ots pistons and how much are you guys spending. Also do they come with the rings/pins/clips and so on?
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Old 01-27-2010, 08:28 PM   #15
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We can do Mahle ots pistons for $555 shipped.

Give me a call and let me know.

www.RealStreetPerformance.com
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Old 01-28-2010, 08:54 AM   #16
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You can also use the stock pistons and really thick (2mm) head gaskets, FYI.
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Old 01-28-2010, 11:43 AM   #17
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Quote:
Originally Posted by Zackbo View Post
You can also use the stock pistons and really thick (2mm) head gaskets, FYI.
Isnt stroke how far the piston moves up? If so then if its going from a 75mm to a 79mm stroke, wouldnt you in fact need a 4mm one without any decking to the block/heads.
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Old 01-28-2010, 12:46 PM   #18
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No, the stroke goes IN 2mm, and OUT 2mm, adding to 4mm overall.
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Old 01-28-2010, 01:06 PM   #19
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Quote:
Originally Posted by reddevil View Post
No, the stroke goes IN 2mm, and OUT 2mm, adding to 4mm overall.
Ah ok, thanks for the clarification on that.
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Old 01-05-2011, 06:25 PM   #20
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What kind of clearance are people running with these? I was recommended .0025-.0033 but that is a little too much for me. These are the 4032 alloy and this is going to be 300-350hp maximum.
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Old 01-05-2011, 09:45 PM   #21
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mine are at .0024; quiet on start up and oil consumption is about a cup every 2k with Syntec 30wt/40wt blend and hard driving. Cars at ~300WHP now plan is 350-400WHP...

Mahle now makes these in a Power Pak Plus out of 2618 alloy (P/N SUB193642P16). Price is $506.42 shipped from autopartsdealer.com. That's an amazingfreakin price!
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Old 01-05-2011, 09:47 PM   #22
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I wish they made these with a higher compression ratio.
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Old 01-16-2011, 11:11 PM   #23
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Mahle can do custom pistons for you. You have to call them. Base price is around $650 for custom EJ Power Pak pistons.
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Old 01-17-2011, 06:59 AM   #24
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I was quoted much higher than that for custom Mahles (~$1k... no idea why). Ended up going with CP instead for $550 shipped. I did exactly what you're asking, kim. Stroker 4032 pistons with 9.5:1 CR. What's interesting is that the recommended p/w clearance on those were 0.0015"...
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Old 01-17-2011, 11:25 AM   #25
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Quote:
Originally Posted by WReXd View Post
I was quoted much higher than that for custom Mahles (~$1k... no idea why). Ended up going with CP instead for $550 shipped. I did exactly what you're asking, kim. Stroker 4032 pistons with 9.5:1 CR. What's interesting is that the recommended p/w clearance on those were 0.0015"...
I'm thinking the tight PTW clearance has to do with the 4032 alloy.
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