So Mahle makes monotherm pistons for the Cummins eh?
http://www.competitiondiesel.com/forums/showthread.php?t=78329
http://www.competitiondiesel.com/forums/showthread.php?t=78329
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Info: Mahle Monotherm Pistons...
- Thread starter paint94979
- Start date
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CompD:
As many of yall know we have been running these pistons for 2 years now. There was alot of unknowns when we first put them in. The extra weight of an all steel piston spinning at 5800 rpm was a little scary at first but 2 years later i can safley say that it isnt a problem. The set i have is 380 grams heavier than a stock piston. The next generation monotherms are around 100 grams lighter. After the first season on them we tore it down & measured for rod distortion & found none!!We put it all back together rings..bearings & all & ran them all last year. We tore it down for this season & all was still good. I am changing the rings this time but everything else is going right back in there. Keep in mind that year before last we had a n2o backfire while spooling up & midway down the track the cylinder wall blew out. We re-used that piston as well. I dont care what anybody says....Nitrous is HOT!! We saw at least 2200 degrees on each & every pass & they are still flawless. This will be year 3 & I am impressed. No they are not cheap...Good stuff never is, you get what you pay for. My Mahle pistons were worth the investment in every way. They let you get by with murder as far as your tuneup goes. The next generation pistons will be a little higher compression & are aimed at the common rail market but should do just fine for the older 24 valves. They can be ran in a 12 v with some injector fiddleing but i dont know what exactley. The pistons i have are .026 below a stock deck height. The new ones will be a little higher. Here are some pics after 2 years of pure hell. There are some shiny spots between the rings on some but its cosmetic. The micrometer says no metal is missing
CompD:
As many of yall know we have been running these pistons for 2 years now. There was alot of unknowns when we first put them in. The extra weight of an all steel piston spinning at 5800 rpm was a little scary at first but 2 years later i can safley say that it isnt a problem. The set i have is 380 grams heavier than a stock piston. The next generation monotherms are around 100 grams lighter. After the first season on them we tore it down & measured for rod distortion & found none!!We put it all back together rings..bearings & all & ran them all last year. We tore it down for this season & all was still good. I am changing the rings this time but everything else is going right back in there. Keep in mind that year before last we had a n2o backfire while spooling up & midway down the track the cylinder wall blew out. We re-used that piston as well. I dont care what anybody says....Nitrous is HOT!! We saw at least 2200 degrees on each & every pass & they are still flawless. This will be year 3 & I am impressed. No they are not cheap...Good stuff never is, you get what you pay for. My Mahle pistons were worth the investment in every way. They let you get by with murder as far as your tuneup goes. The next generation pistons will be a little higher compression & are aimed at the common rail market but should do just fine for the older 24 valves. They can be ran in a 12 v with some injector fiddleing but i dont know what exactley. The pistons i have are .026 below a stock deck height. The new ones will be a little higher. Here are some pics after 2 years of pure hell. There are some shiny spots between the rings on some but its cosmetic. The micrometer says no metal is missing
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interesting... i never knew about it, obviously there is a drastic difference from Cummins to Duramax pistons but why aren't there Duramax Monotherm pistons? Guys like Pat, and the other hp nuts would really benefit from these since piston failure is our main concern(in built racing engines)?
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If I could buy steel pistons, I'd have them. I don't have the resources to make them. Yes, we are pleading with Mahle for some lovin'...
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do they (mahle) have a reason why they don't want to? It surely can't because of a lack of need or market share? There aren't that many being ran in the cummins (thats a hunch) and that didn't stop em from making them for it. Hmm
In general, would these be more expensive than the current forged offerings from Arias and Mahle? Why? process? or difference in material cost? or limited quanities?
C-ya
In general, would these be more expensive than the current forged offerings from Arias and Mahle? Why? process? or difference in material cost? or limited quanities?
C-ya
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John just posted they are in range of 500-700 per piston... say 600x8= 4,800$ that is alot of money for sure but running in a 1400hp engine for 2 full seasons and they are being reused that says A LOT!. Obviously a Cummins is not a Duramax but are there any reasons for the results to not be similar?
I think it's a weight problem. The stock Cummins piston is quite a bit heavier than a stock Duramax piston. I would imagine it would be very difficult to make a steel Duramax piston anywhere near as light as the already light weight stock piston.
Last I heard they scrapped the idea. However, banks uses monotherms in his boat motors.
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Even the Cummins guys only have a few sets floating around. I think they figured out it was pointless in a light duty diesel.