mcanderson
Well-Known Member
The comparison between the turbo link given earlier and VP is over £1500 difference for my D6-330s.
If it wasn’t for bad luck................
- Thread starter Chris H
- Start date
petem
Well-Known Member
Nah, they're K26's used on loads of cars over the years, back from the Porsche 944 and the like.
Mr Googler
Well-Known Member
Dunno then...they don’t even come painted green! ?
MapisM
Well-Known Member
Correct.
The original bits as installed by MAN have the triangular KKK logo embossed on the casing, but they are bound to be sold as BW, nowadays.
BruceK
Well-Known Member
Well I bought 500ml of genuine Volvo green paint for 26 bucks so whoever painted the BW we have is making a bloody mint!
Portofino
Well-Known Member
Yes for scale I popped a pair of ray bans on .Can,t see theses fitting under a 944 bonnet .
K 36 fwiw ? Not 26.
BruceK
Well-Known Member
They yellowing Porto. Is that not excessive EGT? Better check for wobble n shite before youre robbed by the French
burgundyben
Well-Known Member
I was just wondering about the yellowing paint, but isnt that the intake side?
Portofino
Well-Known Member
Ha ha
.Wrong side , that’s the paint on the air side it does yellow with heat due to the compression, remember that hot air is then sent through the CAC .
The business end , the exhaust is water cooled ( see the jacket ) still white .
Interestingly the bearing between the two “wheels “ Is oil cooled see the pipes .
Yesterday I running 580 C EGTs at 28 knots .
CAC temps about 30 ,
Oil about 90- 100 C
water 84 .
Boost 1.8 bar
rpm 1780
Load 78 % .....nice and relaxing purring away
etc etc etc ....
That’s the thing I can see what’s going off ....make rpm / speed adjustments appropriately in the interests of longevity and holding on to £ .
BruceK
Well-Known Member
Portofino
Well-Known Member
Hang on those appear original, I have not had the need to replace ......just out of idle curiosity googled them .The €2K ones seem to me pretty decent value as they are new + 2 year guarantee, with 24 Del to boot .You mean the French already robbed him? Class!
Obviously we are now moving Into refurb Vs new .
I think Chris price ( actually smaller units , with a V8 ) was for reconditioned.
For me I would push the boat out .....buy new .
The only other thing I think one or two ^^^ have mentioned is how many others are damaged ? Two / engine , one each bank
And the $64 000 question , I have asked and Ben ^^^ .......how did it happen ?
The pic shows in my mind a terrific amount of heat has damaged those exhaust vanes , as I said earlier .
It would be nice for the rest of us to get a handle on the aetiology so perhaps prevent a busted KKK or other turbo .
Interesting thread thus far .
We know the VP KAD series burn there tips and insidiously loose boost .I had that .
Again EGTs , excessive load , fouled stern gear = sky high temps .
This is by turbo standards goes further it’s a huge catastrophic fracture of the shaft and destruction of the vanes ( exhaust side ) .
And yes the KKK smaller K 26 was used in the 70 s Le Mans 962 Porsche’s ...Derick Bell et al .So they can take It so to speak .
It’s not as if KKK are fragile ......quite the opposite imho .
620 Hp out of 2.65 L ........so how do you bust a KKK ? Derick Bell couldn’t !
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burgundyben
Well-Known Member
I worked in turbocharger development for a while ( we'll gloss over the fact my first prototype lasted 7 seconds..) the forensic examination of the wreckage is important.
The wheel is trashed because either bearing or shaft failed first. But why? And which one went first?
Somebody one said a lightly loaded diesel is a happy diesel . Remember who that was?
The wheel is trashed because either bearing or shaft failed first. But why? And which one went first?
Somebody one said a lightly loaded diesel is a happy diesel . Remember who that was?
Chris H
Well-Known Member
At the moment I’m putting this down to over temp due to dirty props, boat wouldn’t plane so I cleaned everything and back to normal planing and speed for 5 mins before it went pop, it was only around 4 weeks since the props were last cleaned, talking to one of the maintence guys that look after a cigarette with arnesons and he cleans them at least every 10 days.
julians
Well-Known Member
Have you got exhaust gas temperature guages?
Portofino
Well-Known Member
Yep it becomes a routine ,
Pootle out @ D speed sub 800 rpm .Anchor .Scrub up the props .
1 week lost me 2 knots and gave elevated EGTs .The sea temp here ( 100 miles E of Chris ) is 28; in the bay probably higher in the marina .
Its a steep learning curve .
Forty_Two
Well-Known Member
Porto, you ought to change your name to MrEgt ?
However I admit you persuaded me to install them on my Perkins Sabre M135's.
Very enlightening it was, so easy to see fouling. In fact the increase at the beginning of the season is scary. Helped with re-proffiling my port prop to balance the engine loads as well.
My normal is around 280c, did see 450c during a WOT test.
However I admit you persuaded me to install them on my Perkins Sabre M135's.
Very enlightening it was, so easy to see fouling. In fact the increase at the beginning of the season is scary. Helped with re-proffiling my port prop to balance the engine loads as well.
My normal is around 280c, did see 450c during a WOT test.
MapisM
Well-Known Member
.
MapisM
Well-Known Member
If you can reasonably assume that this was the culprit, I can't for the life of me think of any logical reason why only one cylinder bank should have generated much higher than normal EGT.
Therefore, in your boots I'd definitely want to have all turbos carefully inspected.
Besides, I'd be concerned also about the integrity of the exhaust pipes, whose dry section is pretty long.
At least, as far as I can understand from the pic below, which you previously posted.
Trouble is, with that type of insulation a proper inspection is a helluva job...
Good luck!
Portofino
Well-Known Member
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Portofino
Well-Known Member
Let’s just hope it’s only one , because of the exhaust pipe age lending itself to some unequal ness , something along back pressure lines ?
A thought along a similar vein ....not wanting to be the preacher of doom , but if that was caused by excess EGTs , blade imbalance , wrong type of harmonic vibrations + loadsa heat = snap shaft , then has anyone except just me wondered about the injector tips and exhaust valves ?
This is on top of MapishM s imho quite sensible post mortem trail leading to the other turbo(s)?
Depending on the berth + sun ....hopefully one set , this set of props got more growth ....fingers crossed it just one side due to unequal growth ?
Obviously the best outcome is a simple metal fatigue of old piece of metal not related to running , or attempting to plane with fouled stern gear .ie Chris has done what Derick could not do .....fracture a KKK turbo shaft .And I will be more than happy for Chris if I was proved wrong, and this turns out a simple bolt on fix .