Max-EGT
Posting Guru
Joined: Dec 2003
Posts: 1,570
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From: South Texas Coast
Originally Posted by Dave Sponaugle
Sorry, the pistons are not aluminum, they are hypereutectic pistons which is a silicate aluminum alloy. Melting temp is 1250.
Then if you call garrett you will find the turbo is only rated for 1270 before the impeller blades may be heat damaged. But the turbo is far enough from the pistons that till you get it to 1270 the pistons will probably have holes in them.
Then if you call garrett you will find the turbo is only rated for 1270 before the impeller blades may be heat damaged. But the turbo is far enough from the pistons that till you get it to 1270 the pistons will probably have holes in them.
You can play with technicalities all you want. If you feel safe running with such high EGT be my guest. I personally wil not excede 1200 degrees pre turbo.
Fleet Mechanic
Joined: Nov 2004
Posts: 1,427
Likes: 10
From: Templeton, Massachussetts
Originally Posted by johnny8
that info just makes me feel that much better about backing out of the throttle if i start to see it closing in on 1200*...!
Posting Guru
Joined: May 2005
Posts: 2,305
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From: Walla Walla, Wa
just remember though, that the gas is being measured at 1250 degrees, but what is the rate of heat transfer, the piston doesnt instantly absorb that heat, and the piston itself is being cooled by oil
Posting Guru
Joined: Mar 2005
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The last statement is true. Although it makes us uneasy, you can take the engine a lot further without damage. I know I'll get heat for this, but I had the truck pretty hot last summer. Went down the oregon coast, and up to Crater Lake. Crater Lake is 7500 ft elevation, ambient temps at 35 degrees celcius (closing in on 100degrees Ferenhiet), and pulling a heavy 5ver. My EGT's post turbo were in the area of 1300 the almost the whole climb. doing about 100 km/h the whole way. The engine is fine, although, the following spring, the turbo had to be repaired, for obvious reasons. Not going to do that again, but there is proof that the engines will survive this kind of punishment.
Postmaster
Joined: Nov 2004
Posts: 2,854
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From: New Hampshire
Originally Posted by 18vtx00
take her out of OD works well too.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
What I said about the pistons starting to melt at 1250, not 1222 was not to make you run it harder. And yes the oil jets cool the pistons. The oil also cools the turbo. Do any of you want to tell me how hot your oil can get before it is worthless as far as lubrication?
Running high EGT's can damage a lot more than the pistons and turbo.
Yep that guy did it, his still runs OK so I am gonna do mine the same way.
I know how much a motor costs, and I know how much it costs to swap it once you have the new motor. I personally never run my pyrometer over 1150 pre turbo. There is no place in the world that I have to get to so fast that it is worth a 10,000 dollar motor job.
Running high EGT's can damage a lot more than the pistons and turbo.
Yep that guy did it, his still runs OK so I am gonna do mine the same way.
I know how much a motor costs, and I know how much it costs to swap it once you have the new motor. I personally never run my pyrometer over 1150 pre turbo. There is no place in the world that I have to get to so fast that it is worth a 10,000 dollar motor job.
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Posting Guru
Joined: May 2005
Posts: 2,305
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From: Walla Walla, Wa
not all of us drive our trucks for transportation either, mine is a toy, i beat on it like it stole something, and i pay those consequences, several rear drivelines, one front, one rear ring and pinion set, numerous tires, 1 clutch, but its fun. Push your truck as hard as you want, but remember you pay to play. And if you cant do the work yourself, and have to pay 10K for a motor, then im sorry.
Postmaster
Joined: Nov 2004
Posts: 2,854
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From: New Hampshire
Originally Posted by Stroker_Deezel
not all of us drive our trucks for transportation either, mine is a toy, i beat on it like it stole something, and i pay those consequences, several rear drivelines, one front, one rear ring and pinion set, numerous tires, 1 clutch, but its fun. Push your truck as hard as you want, but remember you pay to play. And if you cant do the work yourself, and have to pay 10K for a motor, then im sorry.
Posting Guru
Joined: May 2005
Posts: 2,305
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From: Walla Walla, Wa
im not telling anyone to play or not to play, what i was saying, is dont preach to me about babying a truck, not all of us do, nor want to. If i melt my motor, fine, i'll pull it, and put something else in it.
Postmaster
Joined: Nov 2004
Posts: 2,854
Likes: 0
From: New Hampshire
Originally Posted by Stroker_Deezel
im not telling anyone to play or not to play, what i was saying, is dont preach to me about babying a truck, not all of us do, nor want to. If i melt my motor, fine, i'll pull it, and put something else in it.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
The only thing that bothers me about this is, what happens when someone reads 1300 degrees is OK. But the person reading 1300 is OK is some guy depending on his truck for a living. He don't know that the person saying 1300 or more is OK is just using his truck as a toy. So the guy goes out and runs his truck up a hill at 1300 and it melts a piston. Now he has no ride and a big repair bill.
I use my truck for work every day. It is also my only transportation. Yes I paid real close to 10,000 for my new engine and the install.
Why?
Well I hired a couple of guys that have a shop to help me swap the engine.
I also replaced the clutch, turned the flywheel, replace the radiator, replaced the heater core, replaced all the belts and hoses, replaced the fan clutch and had all this done in 14 hours from the time it drove in the door of the shop till it drove back out the door. Missed one day of work with my truck.
Some of us depend on our trucks for our living, we do not have time to mess around when it is broken. And we most certianly can not take risks that are uncalled for.
I use my truck for work every day. It is also my only transportation. Yes I paid real close to 10,000 for my new engine and the install.
Why?
Well I hired a couple of guys that have a shop to help me swap the engine.
I also replaced the clutch, turned the flywheel, replace the radiator, replaced the heater core, replaced all the belts and hoses, replaced the fan clutch and had all this done in 14 hours from the time it drove in the door of the shop till it drove back out the door. Missed one day of work with my truck.
Some of us depend on our trucks for our living, we do not have time to mess around when it is broken. And we most certianly can not take risks that are uncalled for.