Engine/Transmission (1998.5 - 2002) Pre-turbo pyro safe temps

[snowracer69]

It's too bad Piers doesn't post anymore, as I'd like to know what they think on this subject... anyway...



I was racing a guy tonight, and my pyro was buried at 1600*F for at least 5 seconds. Now, I know this isn't healthy, so please no lectures, but I would like to know somes thoughts...



I have heard from someone before that there is basically a safe time limit to each temperature you can run our engines at... say 1300* for 15 seconds, 1400* for 10, and 1600* for 5, if you let the engine cool down for a good amount of time afterwards.



My question: To the high HP guys who may run these temps, what ill effects do you see? How long do you hold it there? What is YOUR cool down time/procedure.



As I said, I know it's not good, and the $$$ is being saved for the 4" and the PDR HX-40, but it will be a little while.



Thanks, Josh

 

[illflem]

You're in the wrong forum, all the high HP guys have 12 valves

 

[Greg Boardman-RIP]

If you are going to run a comp box you need a bigger turbo. I can still hit 1450* but that is in the triple digit mph's. On and average I have always heard 1250* is safe all day long. I also have heard 300 for shutdown. My truck takes 15 minutes to get to 300*. I would keep it on the lower levels until you can get a turbo. I ran around all day on level 3X5 and never hit 1200*. Just a suggestion on the turbo, Stephan Kondolay melted his truck from running at 1600* +... ... ... ... ... ... ... ... Greg

 

[ben_ak]

If your worried about proper shut down temp, you should check out the IssPro Turbo Temp Monitor. It monitors post-turbo EGT until the temp reaches an adjustable point (it ships set at 300)and then shuts your engine down. I've had great luck with mine and it was fairly simple to install... just be sure to wire a overide switch for drive throughs and the like.

 

[LSMITH]

Personally I would not worry about 1350 at all, for any length of time. I would not hold 1450 for more than about a minute, and 1600 for more than 20 seconds or so.



Talk to the 24V pullers, 12 V pullers, and drag racers. 1800* for 20 seconds is not unusual.

 

[Joseph Donnelly]

Cummins recommended max, preturbo, is 1300 deg. F.

Aluminum pistons expand in the bores when they get hot. Then then scuff in the bores. Pistons also develop cracks form excessive heat, even if they don't erode from melting at hot spots. The cylinder head cracks between valve seats and to the injector hole when it gets hot. Etc. , etc.

Yep, we know of folks who compete and even have famous name twin turbos, but run 1800 deg. pulling, etc. They also will learn more and more about the costs of rebuilding engines.

I prefer 633 hp @ 1250 deg. Short dyno runs save engines, long races and pulls don't. When winning is the only thing, and it is when competition is severe, that is the only thing you usually end up with--plus roasted parts.

 

[Jetpilot]

I don't know what temps are safe as my egt gauge only goes to 1600*. I do know that during a drag race I will hit 1600+* very quickly and hold it for probably 10 seconds or so... ... I will post what is found when we work on the engine later this month.



Doug