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Old 08-06-2005, 12:21 AM   #1
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Fantastic!!!!

Been out in boat tonight sea was calm and i pulled 8200RPM running with bullet about 1" above, massive rooster tail and i achieved this!
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Old 08-06-2005, 12:24 AM   #2
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However on my next run in my quest for 85MPH this happened
Motor was still running but felt loss of power.
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Old 08-06-2005, 12:26 AM   #3
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When i saw this i thought, how lucky was that it could have cost me thousands but then i notices bits of aluminium in my base tray, and a hole in side of block and this
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Old 08-06-2005, 12:27 AM   #4
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Old 08-06-2005, 12:28 AM   #5
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piston No. 2
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Old 08-06-2005, 12:29 AM   #6
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I think i have joined Roofer with lots of broken bits
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Old 08-06-2005, 12:30 AM   #7
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Bore and piston No.1
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Old 08-06-2005, 12:35 AM   #8
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Oh dear... that's very upsetting
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Old 08-06-2005, 12:35 AM   #9
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in a nut shell this is what i believed happened.

piston number 2 gave up and broke up causing it to sieze in bore
crank and rods moving at 7500rpm said tough shit we aint stopping and ripped the rod off the piston
no.2 rod then smashed its way around punching a hole in the front half by the injectors and a hole in the bottom of hole no.1
all the bits of piston, bearings etc went everywhere including into the new hole in bore No.1 ruining that liner and piston too

Dunno why spark plug sheared but look on the bright side i now have some reeds and a cage i can sell to Taz
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Old 08-06-2005, 12:42 AM   #10
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Dunno why spark plug sheared...
Mebbe loose piston flew up to hit inside of spark plug, pushing conductive core outwards and cracking/shearing the ceramic?
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Old 08-06-2005, 01:02 AM   #11
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Wow, Sherlock.




Burty...WTF
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Old 08-06-2005, 01:08 AM   #12
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The plug snapped because the piston has hit the head really hard and the resulting shockwave hammered the end of the plug off.

The Pistons in that motor are Mahle's. They stopped making these pistons 10 years ago and as they weren't renowned for pin failure like the wiseco's that replaced them they may well be the original pistons, or new old stock. Either way I reckon they've been in there for quite some time and have probably just been re-ringed over and over. The side pins on those pistons are covered over by the ring and were still well in there, not loose at all. They were the best pistons ever made for the 2.5.

Any way it seems as if old age finally got to them. It looks as if the skirt broke up on No.2 piston. The side of the piston is fine no heat marks but in one area it looks as if some debris has got up the side and jamed it in there. The rod has then ripped out the back and proceeded to hammer the crap out of the engine internally including hammering the piston into the head. The top of the piston has a ring round it that matches up with the head. This maybe how the end of plug broke off. It also put a hole in the front case half and another hole just under the rod slot for cylinder No. 1. A roller from the small end roller bearing on the previoulsy mention No. 2 piston has then got into No. 1 snapped in half and found its way past the piston leaving two scores in the cylinder wall. Its/they have then bounced around inside No. 1 cylinder, hence all the half roller shaped marks in the top of the piston. Half the roller was found imbedded in the top of the piston and the other half in imbedded in the head.

So I guess it needs lots of welding, two sleeves, a new rod, 6 new pistons, bearings and gaskets etc. And best have some new reeds too as one of the cages has had a bit of a knock.

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Old 08-06-2005, 07:54 AM   #13
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Quote:
Originally posted by Burty
Motor was still running but felt loss of power.
Probably still run faster than my boat

And there was me yesterday, feeling sorry for myself 'cause I need a new trim cylinder (£150) after 13 years.

Feeling for you dude.
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Old 08-06-2005, 09:12 AM   #14
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feel for you burty dude
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Old 08-06-2005, 08:24 PM   #15
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HOLLY MOLLY! Were you using TNT for fuel?
On the bright side and being honest with yourself I am sure you feel some sense of pride due to doing so much damage while attempting such insane speeds! Got any spares off that which would come in handy for my 225 promax?
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Old 08-06-2005, 09:10 PM   #16
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I did exactly the same at Cardiff bay national putting a hole in the side of the block and i also snapped a plug and a rod. We thought ours was the computer but ya neva know. Ironic that we did the first race at about 7k for an hour, then towed a junior in the second race at about 4500k did about 20mins then she let go.
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Old 08-06-2005, 09:10 PM   #17
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Ah mate burty dude bad luck! and i was only thinking how good your engine was standard compared to the tuned ones, What are you going to do get it rebuilt or scrap it? Maybe intreasted in sum spares

Sod the merc get a yam or sumthing thats what i keep thinking
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Old 08-06-2005, 09:14 PM   #18
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Oh yeh 5 petal reeds are 440 dollars to your door from Jay Smith
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Old 08-06-2005, 09:46 PM   #19
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Dangerous were bouts you from in essex?
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Old 08-06-2005, 09:48 PM   #20
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Colchester, we go to Stone ski club
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