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Let's talk EGT's for boosted NAs
by
vdubspeed
on 23 Jun, 2011 06:35
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So I took a 1.6 N/A and slapped on a 98 TDI turbo, built a 2.25 exhaust, gov mod, fuel screw in 1.5 turns, rotate 1 spline CCW, and slapped in an EGT gauge...but no intercooler.
This thing is WAY faster than it used to be and can easily pull away from traffic at the lights.
Here comes the downside...HIGH EGTs
If I floor it I can see 1500 degrees but I never stay there for more than a second. That's when I'm showing off the car. Generally I never go past 1100. That's where the alarm is set to come on.
Cruising yields 800-900 temps when going down the highway in 95 degree weather.
The car runs AWESOME but I don't want to hurt it. Am I?
Thanks,
Jason
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#1
by
theman53
on 23 Jun, 2011 07:13
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Possibly. I try to stay at or under 1,200F. Aluminum melts right around there and our heads are made of that. Are pistons are certainly some Al alloy. I can see 1,500F and then back off as I really don't want to go more than that ever. Cruising I see around 500F to 1,000F depending on flat ground or hills in 5th. If I were you I would turn down the fuel screw 1/8th of a turn or until you see 1,400 max and still have performance. Or leave it where it is and don't let anyone drive it but you.
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#2
by
8v-of-fury
on 23 Jun, 2011 07:58
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what are you using for an intake? Thought about getting an intercooler?
the 98 came with a k03, so its gonna preeeetty restrictive at higher rpm's as it makes its peak boost at 1900 on the tdi motor. Do you have the wastegate changed at all? or stock from the tdi?
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#3
by
81 vw pu
on 23 Jun, 2011 08:11
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OK guys, for $1500 I will purposely melt down my 1.6 on video so we can put this question behind us.
Maybe even some side bets on what temp and how long it takes.
30 guys x $50 each, any takers.
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#4
by
theman53
on 23 Jun, 2011 08:35
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To do the kind of research I would want would take more than that. I would want to see what it did to the pistons/engine after 30 seconds of EGT's at various temps. So you would need to keep taking the HG off and inpecting. I would send you a couple TD badges for free if you did melt yours down though for my contribution.
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#5
by
81 vw pu
on 23 Jun, 2011 09:04
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To do the kind of research I would want would take more than that. I would want to see what it did to the pistons/engine after 30 seconds of EGT's at various temps. So you would need to keep taking the HG off and inpecting. I would send you a couple TD badges for free if you did melt yours down though for my contribution.
I don't think my old run down back would like pulling the head multiple times, but I have thought about drilling a hole in a old piston insert the egt probe and heat with a torch.
Even try the same on a old cracked/warped head. Only bad part with this test is missing the coolant flow and oil squirters on the pistons.
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#6
by
Powered by Spearco
on 23 Jun, 2011 09:51
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I got $30 on it.
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#7
by
R.O.R-2.0
on 23 Jun, 2011 10:10
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i already burned one down once.. and im still driving it..
it seized up from high EGTs.. how high tho, i will never know..
you wont melt down the engine.. it will seize before anything gets hot enough to melt.. the piston to bore clearance is soo small, that any piston growth at all, pretty much makes the piston too big to go up and down anymore..
i guarantee you that i could pull my engine apart, and the most damage there would be, is scuffed piston skirts, and maybe a little erosion right under the swirl chamber..
im half tempted to take it apart just to prove to you guys that these engines are TOUGH..
i was holding the throttle wide, at 100 mph, turning like 5500 revs, making ~25 psi un-intercooled boost.. on a 3 mile long hill.. well, lets just say that my engine only made it 2.5 miles, and the other half mile to the top was done coasting.. good thing i had 100mph of momentum to carry me over the top..
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#8
by
81 vw pu
on 23 Jun, 2011 10:50
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you wont melt down the engine.. it will seize before anything gets hot enough to melt..
Well here's the first bet!!! I got $20 says I can transfer melted piston aluminum to the cylinder walls before it seizes.
Provided I get the full $1500 for the test.
And by the way I'm just bored and trying to have some fun.
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#9
by
RabbitJockey
on 23 Jun, 2011 16:05
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hill folk told me before that he ran an na motor up into the 1600 range with out anything bad happening, honestly if no one is sustaining that high of temps i don't see it hurting anything all that much, ok your exhaust temps are 1500, and probably a little bit higher inside the cylinder, but the metal has to absorb that heat from the air before it would ever even begin to melt, and you figure the cylinder is only that hot for half of the combustion process, the other half is intake and compression stroke, honestly i think burnt valves will be a problem before the pistons would be.
i had a bad injector cause a cracked head before, who knows what temps it took to do that, it probably didn't help that only that cylinder was getting that high of temps, but that piston really looks quite fine aside from a wider burn mark on it.
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#10
by
RadoTD
on 23 Jun, 2011 20:48
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I'm in for $30 as well!
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#11
by
keaton
on 24 Jun, 2011 00:22
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i'm in to come pick up the car and drive it home.
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#12
by
R.O.R-2.0
on 24 Jun, 2011 14:02
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you wont melt down the engine.. it will seize before anything gets hot enough to melt..
Well here's the first bet!!! I got $20 says I can transfer melted piston aluminum to the cylinder walls before it seizes.
Provided I get the full $1500 for the test.
And by the way I'm just bored and trying to have some fun.
$50 says i already transferred aluminum to my bores, and scrubbed it clean with my rings..
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#13
by
vdubspeed
on 25 Jun, 2011 05:26
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wow...funny feedback.
I'm glad I have a few more N/As outback if this one pops. I'll look into an intercooler fo sho.
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#14
by
keaton
on 25 Jun, 2011 16:43
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wow...funny feedback.
I'm glad I have a few more N/As outback if this one pops. I'll look into an intercooler fo sho.
hey if your just gonna melt it down/ blow it up i'll come take it off your hands
i'm diesel'less and having a hard time finding one
