Healthy temp on/at the exhaust elbow of a KAMD300 at 3100 rpm?

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A_8

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Chasing a "too much steam" problem and get around 45-50 celsius on the surface of the elbow. I have no reference and hoping some of you might be able to offer one?

I am thinking it's a bit hot, should be maybe 35-40 when the sea temp 19-20 celcius.
 
Sh%$! Now you make me worried. Mine sit at 76C and 74C respectively according to the probes I have in when at those revs (not exactly surface temp but internal gas and water spray). Engines a rock solid 87C though (measured at thermostat housing)
 
unless you explain where exactly you're measuring, doubt anyone can help...
from the temps you mention, I guess the IR hits a double skinned cast elbow? or are you measuring on the rubber hose?
and guess it's both engines doing the same?
 
The on/at exhaust elbow referred to the surface of the elbow using an IR temp reader.

I assume it's much warmer if one had a probe to measure the gas and water spray a bit further down the hose/exit of the elbow.

This is a one engine boat.
 
Mine sit at @ 55 degs C which the Volvo guys say is slightly hot, they expect @ 50. And they were brand new at the time.
Sounds like yours are about right. If you are getting too much steam have you checked the spray vents inside the elbow? Too much steam is usually lack of sea water running through but enough to keep the engine etc happy. I improved the steaming on a 63P by opening the spray head slots a bit with a screw driver.
 
A_8 said:
The on/at exhaust elbow referred to the surface of the elbow using an IR temp reader.

I assume it's much warmer if one had a probe to measure the gas and water spray a bit further down the hose/exit of the elbow.

This is a one engine boat.
Click to expand...
you mean just before the rubber hose, so mixer sort of area.

I have probes in the risers on mine say 200mm from the turbos, yes temps much higher, but irrelevant in your case.
50C sounds nice and cool considering seawater inside has just travelled throughout the h/e of the engine and is mixing with hot exhaust gasses...

OT, I may be mixing the swedes in mobo forum but isn't you the one with the nice IT designer mobo with some glass bits between the helm and the galley underneath? thought it was twin engined!

cheers

V.
 
kashurst said:
Mine sit at @ 55 degs C which the Volvo guys say is slightly hot, they expect @ 50. And they were brand new at the time.
Sounds like yours are about right. If you are getting too much steam have you checked the spray vents inside the elbow? Too much steam is usually lack of sea water running through but enough to keep the engine etc happy. I improved the steaming on a 63P by opening the spray head slots a bit with a screw driver.
Click to expand...

Ok, thanks. The elbow is new and stainless with good open slots, it replaced one that had half of the slots blocked but this did not change the steam problem.
 
vas said:
you mean just before the rubber hose, so mixer sort of area.

I have probes in the risers on mine say 200mm from the turbos, yes temps much higher, but irrelevant in your case.
50C sounds nice and cool considering seawater inside has just travelled throughout the h/e of the engine and is mixing with hot exhaust gasses...

OT, I may be mixing the swedes in mobo forum but isn't you the one with the nice IT designer mobo with some glass bits between the helm and the galley underneath? thought it was twin engined!

cheers

V.
Click to expand...
Yes the mixer sort of area and must be another Swede, this is my dad's boat that I have sort of inherited as he has gotten too old.
 
simonfraser said:
yeh put the (BBQ) probe on the collar just after the turbo and before the cooled elbow where it is single skinned
that will give you a better idea of the turbo exhaust temp
else it is all just a load of hot water
Click to expand...
Ok, good point in that maybe the exhaust temps are too high creating steam as it mixes with the water. What temp range should I get if I probe the collar?
 
A_8 said:
Ok, good point in that maybe the exhaust temps are too high creating steam as it mixes with the water. What temp range should I get if I probe the collar?
Click to expand...

exhaust temp will be above 100C at the manifold, at the collar of turbo / elbow i have not seen more than 100C on my KAD 44, but i dont stress it. 3k revs max

i am no mechanic, but by the time the exhaust is emerging from the water i'd hope it is less than 100C in temp and not steaming any more :unsure:
 
simonfraser said:
exhaust temp will be above 100C at the manifold, at the collar of turbo / elbow i have not seen more than 100C on my KAD 44, but i dont stress it. 3k revs max

i am no mechanic, but by the time the exhaust is emerging from the water i'd hope it is less than 100C in temp and not steaming any more :unsure:
Click to expand...
Ok, I'll try to measure this when I am out next. Thanks.
 
Would a stainless elbow get hotter than a cast (whatever they are made of) one?

taking a temp with an IR gun could then not be comparable to others results?
 
Not too sure Googler,
I'd hazard a guess that temps would be similar, with variations coming mainly from the way seawater is routed through the elbow. In that respect ss may be a bit cooler
 
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