How hot can forged pistons get?
11-06-2003, 05:52 AM
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How hot can forged pistons get?
I have the Endyn roller wave pistons and my EGT go all the way up to 1600 deg when I’m boosting. I have been told that at about 1750 to 1800 is where you start to get into trouble?
11-06-2003, 06:40 AM
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Re: How hot can forged pistons get? (rjardy)
At 1500 degrees aluminum melts, so by 1700d and higher your would be up ***** creek far before then. EGTS around 1100 1200 degrees would be all i would want to see. Someone please correct me if i am wrong.
11-06-2003, 10:26 AM
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Re: How hot can forged pistons get? (DSF)
Not coated with anything I don't think and cruising on the highway it's about 1300 to 1400 deg at full boost in 4th right before I have to shift its hits about 1650 deg. My A/F is under 12 just about the whole time.
Here is a pic just so you know where I'm taking the temp
Here is a pic just so you know where I'm taking the temp
11-06-2003, 10:33 AM
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Re: How hot can forged pistons get? (DSF)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DSF »</TD></TR><TR><TD CLASS="quote">1400-1500 deg. F is considered typical for a WOT full boost load. Highway cruising may have higher or lower EGTs.</TD></TR></TABLE>
, thats how mine always was.
, thats how mine always was.
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11-06-2003, 11:32 AM
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Re: How hot can forged pistons get? (civicb18)
ever body keeps saying lower and lower numbers and I will say it agen it's going up to 1600 so it's not melting there so it must be on the edge
11-06-2003, 11:35 AM
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Re: How hot can forged pistons get? (EFrollingout)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EFrollingout »</TD></TR><TR><TD CLASS="quote">How hot can forged pistons get?</TD></TR></TABLE>
Hot enough to do this...
Hot enough to do this...
my tuner
11-06-2003, 01:49 PM
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Re: How hot can forged pistons get? (MiraiZ)
EGT's have nothing to do with cyinder temperatures. In fact, hotter EGT's usually mean cooler cylinder temps because the fuel is burning in the manifold, not the combustion chamber.
11-06-2003, 06:17 PM
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Re: How hot can forged pistons get? (civicb18)
I think the metals themselves are the same, but forging is just the way the pistons are formed (pounded into shape instead of molded). Someone correct me if I am wrong.
11-06-2003, 06:56 PM
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Forging will change the overall hardness of the metal. It will not effectivly change the melting temp. Depending on what pistions you have the aluminum is alloyed differently and that can change the melting temp. Like SRP pistons VS JE. The SRP have a lower melting temp cause they have a higher silicone content.
11-06-2003, 07:19 PM
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Ross - 1600F ? - but is this constant at highway cruising or only at WOT ? What is your AF ratio at WOT? I wouldnt go over 1650 or so. I have seen steady 1650's in some of my old shitboxes with no fancy-shmancy pistons 
Sounds like you are leaning "lil red" out, try to richen it in the rpm band if it worries you...I did this on a long drive with the s-afc, I would richen it up and EGT's would drop right away. But doent mean that its right to do, of course. Best is to tune with a wideband on a dyno, but you already know that!
Also, What EGT gauge are you using? Check it for sure, get a greddy EGT coz that way its more than adequate. Yes, you have to convert, but they have calculators to do that online
PM or call me next time you come up. Seems like you are too good to talk to me or something, nowadays!
Finally,
Sounds like you are leaning "lil red" out, try to richen it in the rpm band if it worries you...I did this on a long drive with the s-afc, I would richen it up and EGT's would drop right away. But doent mean that its right to do, of course. Best is to tune with a wideband on a dyno, but you already know that!
Also, What EGT gauge are you using? Check it for sure, get a greddy EGT coz that way its more than adequate. Yes, you have to convert, but they have calculators to do that online
PM or call me next time you come up. Seems like you are too good to talk to me or something, nowadays!
Finally,
11-06-2003, 08:02 PM
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Re: (revhigh96)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by revhigh96 »</TD></TR><TR><TD CLASS="quote">Forging will change the overall hardness of the metal. It will not effectivly change the melting temp. Depending on what pistions you have the aluminum is alloyed differently and that can change the melting temp. Like SRP pistons VS JE. The SRP have a lower melting temp cause they have a higher silicone content.</TD></TR></TABLE>
i didnt even take that into consideration 
i didnt even take that into consideration
11-06-2003, 10:27 PM
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Re: (lsvtec4door)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lsvtec4door »</TD></TR><TR><TD CLASS="quote">metal starts to deform at 1650f</TD></TR></TABLE>
"Metal" is a pretty broad word, especially for this thread...
"Metal" is a pretty broad word, especially for this thread...
11-07-2003, 02:54 AM
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Re: How hot can forged pistons get? (EFrollingout)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EFrollingout »</TD></TR><TR><TD CLASS="quote">so how would i get the egt to go down</TD></TR></TABLE>
It's hard to say. Similar actions can have differing results. If you are running lean, going farther lean or more rich can both lower egts. Generally, advancing timing will lower egts, retarding will raise.
Also, it's hard to see from the pic you provided, but is your egt probe reading only runner #1? If so, that may not be good for 2 small reasons. Usually, cylinder #3 runs the hottest and also, the probe looks like it's mounted after the wastgate, thereby possibly missing some exhaust flow.
It's hard to say. Similar actions can have differing results. If you are running lean, going farther lean or more rich can both lower egts. Generally, advancing timing will lower egts, retarding will raise.
Also, it's hard to see from the pic you provided, but is your egt probe reading only runner #1? If so, that may not be good for 2 small reasons. Usually, cylinder #3 runs the hottest and also, the probe looks like it's mounted after the wastgate, thereby possibly missing some exhaust flow.