How Hot and How Long???? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 11 (permalink) Old 08-16-2009, 04:03 AM Thread Starter
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How Hot and How Long????

What is max egt temps you want to see on stock heads and how long would you hold her down. I am seeing around 1400 faily quickly on street race tune and have not had any puking so I dont know. Maybe 1400 is not even hot so please advise... Runs good and hard to let go but dont really feel like studding right now ya know...............
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post #2 of 11 (permalink) Old 08-16-2009, 05:20 AM
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Re: How Hot and How Long????

"How Hot and How Long????"

thats what she said

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post #3 of 11 (permalink) Old 08-16-2009, 06:10 AM
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Re: How Hot and How Long????

I always thought it was 1250 for extended periods of time, but IDK for sure thats just what I go by.

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post #4 of 11 (permalink) Old 08-16-2009, 07:24 AM
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Re: How Hot and How Long????

I can hit 1600 easy on Matt's street race and Eric's Xtreme street. For a quick little run it's nothin, but I wouldn't hold that temp for a extended period of time...

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post #5 of 11 (permalink) Old 08-16-2009, 09:50 PM
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Re: How Hot and How Long????

Dont stud it till she blows. Dont fix whats not broken ya know?
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post #6 of 11 (permalink) Old 08-17-2009, 01:17 AM
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Re: How Hot and How Long????

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Originally Posted by boyonblue52 View Post
Dont stud it till she blows. Dont fix whats not broken ya know?
Can't say I agree. It'l be just his luck that they blow on a road trip or something and leave you stranded. Do it when you have the money and time.

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post #7 of 11 (permalink) Old 08-17-2009, 01:20 AM
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Re: How Hot and How Long????

well, both sides have merit here.

Yes you can wait till they blow to fix, and yes you can fix it in adavnce before they blow to maybe save yourself some trouble.

BUT in all honesty a blown HG isnt gonna leave you stranded, unless you run it for 10k miles after you think its blown.

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post #8 of 11 (permalink) Old 08-17-2009, 01:21 AM
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Re: How Hot and How Long????

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Originally Posted by boyonblue52 View Post
Dont stud it till she blows. Dont fix whats not broken ya know?
cant say i agree with that on something like head studs.

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post #9 of 11 (permalink) Old 08-17-2009, 08:02 AM
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Re: How Hot and How Long????

The way I understand, it boils down to heat soak. 1800 degrees for 4 or 5 seconds will likely do little harm compared to 1400 degrees for 30 seconds or even 1250 degrees for 1 minute +. Reason being, a short burst of 1800 degree heat is not enough to saturate an aluminum piston to it's melting point of roughly 1220 degrees.

Imagine a torch and an aluminum can. Say the torch is putting out a flame of 2000 degrees F. If you simply wave that flame over the aluminum can slowly for a few seconds at a time the can does not melt even though aluminum has a melting point far below 2,000 degrees. But hold the flame against the can for an extended period of time and it will soon melt as temp of the can reaches 1220 and beyond.

As for EGT's and HG failure I have no idea. I was running a stock tune with exhaust and intake when mine let go while I was towing about 10,500lbs with EGT's around 900 degrees. However, I suspect that was due to higher than normal cylinder pressures (under load) and the weak factory head bolts rather than a relation to EGT. But I'm no expert.

Hope this helps.


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post #10 of 11 (permalink) Old 08-18-2009, 01:23 AM Thread Starter
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Re: How Hot and How Long????

I'll take it, preciate the input. I give her short bursts and let out easy when I see 1400-1600 and it cools quickly so thanks.
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