What is the Maximum Continues EGT Limit

[amx1kjw]

Need some help, I am looking for the Maximum Continues EGT and the Maximum EGT for my 6BTA5.9-M2’s CPL 1928 in my 1997, 4788 Bayliner. Both engines were manufactured in 1996.
WOT 2850
Port engine sn:45352537 & has 1950 hrs
Starboard engine sn:45356373 & has 2010 hrs
Props are 24×24 Nikishuma

Topic

[Bill Desmarais]

Here’s a video of my 6BTA 370 running @ 2600 rpm. EGTs are 750ish. The EGT will hit 800F WOT.

The engine is installed in a 25 ft downeast lobster boat. Total weight maybe 8500-9000 lbs.

The 370 is not producing much hp to move the boat along @ 23 knots. Not sure of % load.

The engine is purposely under propped @ 3250 WOT as not to abuse the ZF63A gear.

For what it’s worth,

Bill D

1 user thanked author for this post.

amx1kjw

[amx1kjw]

Tony thank you. I have been watching the EGTs for some time and run at 1000 F in the 2200 to 2400 rpm range. I am going to clean the aftercoolers this week. No salt water to speak of it is mainly been in fresh water it entire life. My boost at these RPMs is 17-20 psi.

[Tony Athens]

If you look at all of the various 6BTA models rated from the early 300 ( CPL 970/1613) thru the latest CPL 8457 (370 Diamond), published EGT’s run from about 850F thru 920 F at WOT/full engine loading. Remember, these numbers are taken is certified test cells and are there for a guide..

Engine room conditions are far from test cell conditions as to everything that affects engine performance, and these engine specs are on NEW ENGINES..

Field experience has told me most installs run higher than these specs– May 25F-100F and still to me, this is normal.. And something running below WOT can product higher EGT’s than at full RPM–Lot’s of variables in how each boat can load an engine.

So back to your question– Maybe once the vessel is on a clean plane at 2000-2400 RPM–900-950 F-ish? Running below 900F is always a good thing, but very “propped out” early B’s do that.

How long have been watching the EGT? An established base line is good when all is in good shape & up to spec, especially the aftercooler and the turbo..A turbo that has been eating saltwater just about always lowerers boost and raises EGT. A dirty aftercooler also does the same.

Tony

[Author]

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