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Old 02-09-2014, 10:26 PM   #1
Sivandor
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Default Mahle 4032's

Anyone use these in builds, looking for reviews etc. seriously considering them
Thanks
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Old 02-10-2014, 11:06 AM   #2
BeastianSTI
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I've heard they are one of the quietest forged pistons out there due to the metal. I'm looking into them currently.
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Old 02-10-2014, 11:57 AM   #3
Sivandor
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Yea trying to decide between them and super techs, I just want a piston that will be reliable longevity wise, I'd like a motor that can go 100k at power levels with full bolt ons on a vf turbo, I'm certain it is possible
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Old 02-10-2014, 12:22 PM   #4
gfx2043
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I'm running them in my built hybrid just over 350AWHP on 93 and 437AWHP on E85. Over 22K miles now and I only consume .25 qt of oil every 3k miles and as one would expect for 4032 alloy they are quiet.
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Old 02-10-2014, 12:54 PM   #5
Sivandor
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Quote:
Originally Posted by gfx2043 View Post
I'm running them in my built hybrid just over 350AWHP on 93 and 437AWHP on E85. Over 22K miles now and I only consume .25 qt of oil every 3k miles and as one would expect for 4032 alloy they are quiet.
Good to hear, what's your setup?
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Old 02-10-2014, 03:59 PM   #6
alakazoo22
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I'm also running them, very quiet,

350whp on 94 oct in my FXT.
20K mile on them, 0.00 qt of oil every 3K, no AOS or Catch can.
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Old 02-10-2014, 05:14 PM   #7
Sivandor
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Quote:
Originally Posted by alakazoo22 View Post
I'm also running them, very quiet, 350whp on 94 oct in my FXT. 20K mile on them, 0.00 qt of oil every 3K, no AOS or Catch can.
Awesome
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Old 02-10-2014, 05:25 PM   #8
MartinSTi05
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I have built two engines over the last few years with them. My experiences have been very positive. The 4032 Alloy allows a tight piston to wall clearance. I built a 2.1L stroker and a 2.5L. The stroker has been running ~stock power levels for 3 years and about 30,000 miles with no issues. and the 2.5L is a stage 2 car with about 35,000 miles since build. Both cars are quiet and exhibit stock like oil consumption. I would highly recommend them.
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Old 02-10-2014, 05:36 PM   #9
alakazoo22
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I'm not running a tight PTW clearance.. IIRC I'm at 0.0035 on a 100mm piston.

My machinist call Mahle and ask spec for 400 450 chp and mahle said, 0.003 to 0.0035.
My engine builder told me that my engine are most quiet than Cosworth piston and all other 4032 available.
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Old 02-10-2014, 05:49 PM   #10
BeastianSTI
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.0035 is pretty standard, is it not?
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Old 02-10-2014, 07:22 PM   #11
alakazoo22
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Quote:
Originally Posted by BeastianSTI View Post
.0035 is pretty standard, is it not?

Standard on a 2618 piston maybe ?
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Old 02-10-2014, 08:01 PM   #12
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Those are definitely on the large side for a piston made out 4032 alloys.
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Old 02-10-2014, 08:17 PM   #13
wantsti
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My je 2618 pistons are quite with a .0035 ptw clearance. You wouldnt be able to tell if they were stock or not.
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Old 02-11-2014, 03:27 AM   #14
Sivandor
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Quote:
Originally Posted by alakazoo22 View Post
Standard on a 2618 piston maybe ?
what was the recommended clearance on the instructions which came with the pistons?
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Old 02-11-2014, 08:34 AM   #15
alakazoo22
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Quote:
Originally Posted by Sivandor View Post
what was the recommended clearance on the instructions which came with the pistons?
Don't know.. My machinist call Mahle directly and ask PTW for 400 450 chp.
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Old 02-11-2014, 11:08 AM   #16
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They are really nice. My friend ran one of the first sets for a Subaru years ago. They were very quiet and they took a beating. He finally melted one at 625whp. Granted they were never designed for that power and other things went wrong on that pass at the track.
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Old 02-11-2014, 08:43 PM   #17
03SubyWRX
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I run Mahle 4032 99.75mm pistons in my hybrid motor, and I'm very satisfied with them. No piston slap or significant oil loss in my motor. They have a nice coating too on the skirts. My machinist was also able to call up Mahle and get their PTW and ring gap specs very easily, which I consider a plus. It makes a difference in machining.

I'm running a VF34 with full bolt ons, but I'll be upgrading to a Dom 1.5XTR this spring. I'll check back after logging some miles.

Go for them.
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Old 02-11-2014, 09:05 PM   #18
user1029
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Quote:
Originally Posted by alakazoo22 View Post
I'm also running them, very quiet,

509whp on 93 oct in my STi.
20K mile on them, 0.00 qt of oil every 3K, yes AOS or Catch can.
Shameless plug for Manley Platinum series FTW
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Old 02-12-2014, 01:11 AM   #19
carlos.danger
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who did you guys order these from?
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Old 02-12-2014, 01:33 AM   #20
Sivandor
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Quote:
Originally Posted by carlos.danger View Post
who did you guys order these from?
Im wondering the same thing, some of the vendors listed on google seem shady
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Old 02-12-2014, 01:41 AM   #21
carlos.danger
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Quote:
Originally Posted by Sivandor View Post
Im wondering the same thing, some of the vendors listed on google seem shady
yup.
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Old 02-12-2014, 02:08 AM   #22
sultanofsubguns
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Those guys get good reviews on the forum from the people that have had their VF series turbos rebuilt by them and they also sell engine parts.
http://6starspeed.com/mahle.html
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Old 02-12-2014, 02:12 AM   #23
norexyet
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Not sure who sells them. We dealt directly with mahle years ago.
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Old 02-12-2014, 01:12 PM   #24
gfx2043
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I'm running a 09+ sti short block, stock rods and Mahle 4032 pistons, S20 heads EQ tuning cnc chambers, self ported, degreed BC 272 cams, Manley valve springs, stock valves, DW 800CC injectors, DW65 pump, Blouch 1.5xt-r 10 cm, invidia up pipe, invidia down pipe, Cobb cat back, ported exhaust with custom made x over pipe, Perrin V2 intake, Custom TMIC, Cusco catch can, and I welded an extra breather to the valve covers and "T" in the extra crank case vent to them. I know I forgot some things but this is a majority of the motor. I run around 21-22 lbs of boost on 93 with an HOA boost controller.
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Old 02-12-2014, 02:02 PM   #25
Sivandor
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Quote:
Originally Posted by gfx2043 View Post
I'm running a 09+ sti short block, stock rods and Mahle 4032 pistons, S20 heads EQ tuning cnc chambers, self ported, degreed BC 272 cams, Manley valve springs, stock valves, DW 800CC injectors, DW65 pump, Blouch 1.5xt-r 10 cm, invidia up pipe, invidia down pipe, Cobb cat back, ported exhaust with custom made x over pipe, Perrin V2 intake, Custom TMIC, Cusco catch can, and I welded an extra breather to the valve covers and "T" in the extra crank case vent to them. I know I forgot some things but this is a majority of the motor. I run around 21-22 lbs of boost on 93 with an HOA boost controller.
Awesome, how long have you been running this and what kindve power are you making?
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