Mahle Monotherms,2 years later. - Page 2 - Competition Diesel.Com

Timebomb · 02-17-2010, 05:31 PM

You will find the same piston in every new Mack and Volvo Class 8 engine. A very nice piston indeed. We try to break them everyday with no luck yet.

Charles · 02-17-2010, 05:40 PM

Couple years ago I begged everyone I could find at Mahle to make me a set for my 7.3L. They refused, else I'd be running a set in my DD.

When I start seeing rod caps pulling off, cap bolts breaking or rods tearing apart I'll worry about the weight.

Since all the failures are from the rods doing their best impression of a horseshoe I think the compressive force is the problem, not the inertial.

Steel pistons are where it's at. Let the valves/turbine wheel be the weak link.

lol.

crewgirl · 02-17-2010, 06:12 PM

Quote:

Originally Posted by Dalpilot

I think that would Be "Keaton" Shelly. Some folks call him by his name, Keating Shelly, but the Aledo area of Texas tends to not get it right. I HAVE GOT TO GET OUT OF THIS AREA! I'm tired of getting lumped in with everyone else. John and Greg are cramping my style! Can I come to Central Texas Tim?

John, those pistons look familiar for some reason. There simply is no replacement for a quality part. WIth the beating those have taken, they are well worth the investment.

Mahle has always been a first class manufacturer. I'm a big enough fan of their stuff I named my dog Mahle!

Scooter's Roofing · 02-17-2010, 07:11 PM

Quote:

Originally Posted by Charles

Couple years ago I begged everyone I could find at Mahle to make me a set for my 7.3L. They refused, else I'd be running a set in my DD.

When I start seeing rod caps pulling off, cap bolts breaking or rods tearing apart I'll worry about the weight.

Since all the failures are from the rods doing their best impression of a horseshoe I think the compressive force is the problem, not the inertial.

Steel pistons are where it's at. Let the valves/turbine wheel be the weak link.

lol.

roger that, steel pistons make me drool

*Snedge* · 02-17-2010, 07:23 PM

The beauty of steel, is that its not made of aluminum.
We always upgrade the ISX overhauls in our shop to the Monotherm. Piece of mind is priceless.

soulezoo · 02-17-2010, 08:08 PM

the ~$3600 is a lot cheaper than a ~$10-12g rebuild.

Nice pistons... Thanks for the info, John.

Scooter's Roofing · 02-17-2010, 08:43 PM

Quote:

Originally Posted by Snedge

The beauty of steel, is that its not made of aluminum.

that's poetry

*Snedge* · 02-17-2010, 08:46 PM

Quote:

Originally Posted by Forrest Nearing

that's poetry

You should here it when it is sung out load.

Signature600 · 02-18-2010, 07:36 AM

Quote:

Originally Posted by Snedge

You should here it when it is sung out load.

Or played on Guitar Hero...

Chris

*Snedge* · 02-18-2010, 07:50 AM

Loud. Not load. I'm dumb.

JasonCzerak · 02-18-2010, 08:00 AM

Quote:

Originally Posted by Snedge

Loud. Not load. I'm dumb.

POWER Freak · 02-22-2010, 07:20 PM

Damn those are stout pistons. may be a little too steap on price for a dd

Scooter's Roofing · 02-22-2010, 07:39 PM

Quote:

Originally Posted by POWER Freak

Damn those are stout pistons. may be a little too steap on price for a dd

not bad insurance for a rig that tows heavy all the time... you start to hang an injector going up a grade, your pyro may never show an issue, and by the time you crest the top, you've got a reconfigured piston and a lot of blowby

Jim Fulmer · 02-22-2010, 09:05 PM

Agreed, I'd like to know about them too, John has beat the crap out of that motor and is now using the same pistons for the rebuild, that's good enough for me.

Jim

Joesixpack · 02-22-2010, 09:56 PM

X2, I stuck a injector when I blew a solenoid off, and the monotherms took it like a champ.

I modified my pistons so that I could spray oil inside the skirt rather than outside the skirt.

John Robinson · 02-22-2010, 11:04 PM

That a clever idea!!

02-17-2010, 08:08 PM	#26
soulezoo Name: soulezoo Title: diesel uber alles Status: Not Here Join Date: Jan 2008 Location: Applegate, CA Member`s Gallery Posts: 472	the ~$3600 is a lot cheaper than a ~$10-12g rebuild. Nice pistons... Thanks for the info, John. __________________ "The Punisher" 2004 3500 QCSB Laramie 4x4, CA emissions 235hp engine: Peak Diesel Performance BB twins, otherwise pretty stock...special thanks to Harry and Piers at Peak Diesel Performance... 11.89 @ 119.2mph... 900.84/1689.76 on #2 @ Left Coast Diesel 8/21/09.

02-22-2010, 07:20 PM	#32
POWER Freak Name: POWER Freak Title: Green Behind the Ears Status: Not Here Join Date: Aug 2009 Member`s Gallery Posts: 51	Damn those are stout pistons. may be a little too steap on price for a dd __________________ 03 Cummins QCSB 4x4 1025/1825 fuel only, non load dyno http://youtu.be/zHQSRxzKsWA Huge thank yous to Pat @ Big Twin Diesel Patrick @ Mastertech Diesel Injection Dave @ Ultimate Transmission

02-22-2010, 09:05 PM	#34
Jim Fulmer Name: Jim Fulmer Title: Too Much Time Status: Not Here Join Date: May 2006 Location: Quanah Tx. Member`s Gallery Posts: 5,013	Agreed, I'd like to know about them too, John has beat the crap out of that motor and is now using the same pistons for the rebuild, that's good enough for me. Jim __________________ 01' 12V, S/B, Q/C, 4WD 98' 12V, S/B, Q/C, 2WD

02-22-2010, 09:56 PM	#35
Joesixpack Name: Joesixpack Title: Pull'n it. Status: Not Here Join Date: Apr 2008 Member`s Gallery Posts: 4,118	X2, I stuck a injector when I blew a solenoid off, and the monotherms took it like a champ. I modified my pistons so that I could spray oil inside the skirt rather than outside the skirt. __________________ Basically stock if I would have built it at the factory.....

02-22-2010, 11:04 PM	#36
John Robinson Name: John Robinson Title: Too Much Time Status: Not Here Join Date: Dec 2006 Location: Weatherford, Tx. Member`s Gallery Posts: 2,384	That a clever idea!! __________________ "Ask any American Indian what will happen to this country if we dont control immigration."

02-17-2010, 05:31 PM	#21
Timebomb Name: Timebomb Title: Bootney Lee Fonsworth Status: Not Here Join Date: Apr 2007 Location: The Swap Meet Member`s Gallery Posts: 2,069	You will find the same piston in every new Mack and Volvo Class 8 engine. A very nice piston indeed. We try to break them everyday with no luck yet.

02-17-2010, 05:40 PM	#22
Charles Name: Charles Title: Too Much Time Status: Not Here Join Date: Nov 2007 Member`s Gallery Posts: 1,592	Couple years ago I begged everyone I could find at Mahle to make me a set for my 7.3L. They refused, else I'd be running a set in my DD. When I start seeing rod caps pulling off, cap bolts breaking or rods tearing apart I'll worry about the weight. Since all the failures are from the rods doing their best impression of a horseshoe I think the compressive force is the problem, not the inertial. Steel pistons are where it's at. Let the valves/turbine wheel be the weak link. lol.

02-17-2010, 07:23 PM	#25
Snedge Name: Snedge Title: Comp Diesel Sponsor Status: Not Here Join Date: Sep 2006 Location: Western Pa. Member`s Gallery Posts: 18,859	The beauty of steel, is that its not made of aluminum. We always upgrade the ISX overhauls in our shop to the Monotherm. Piece of mind is priceless.

02-18-2010, 07:50 AM	#30
Snedge Name: Snedge Title: Comp Diesel Sponsor Status: Not Here Join Date: Sep 2006 Location: Western Pa. Member`s Gallery Posts: 18,859	Loud. Not load. I'm dumb.