Right, I'm getting pissed off with coming home on the back of a recovery truck.

Started the car, first time since Stoneleigh, ran it up to the petrol station, filled up with super unleaded, warmed it up and went out to play. About 20 miles further on pulling out of a 30 zone onto a national speed limit road I opened up the throttle and it started making horrible noises. Sounded like a big lump of something heavy hitting something metal.

Pulled over, killed the engine, took the bonnet off. Oil all over the shop, looks like it came out the breather on top of the gearbox. Started it up and it runs OK, apart from the horrible knocking sound and the oil / air spraying out the breather.

Jambojeef came out and had a look at it while we waited for the AA. Took the plugs out and they are all the same, a mid grey colour. Took the cam cover off and turned it over, everything looked OK, springs going up and down, all followers working ok.

The engine starts and runs OK, apart from this horrible noise. Any ideas? Anyone in the North East got a compression tester for a bike engine.

Cheers

Mike

Sounds bad. But you knew that.

Have you got a baffled sump?

Can you do a (sound) recording?

Whats the oil pressure like?

from your brief description if its worst case it sounds like big ends.

Ned.

Sounds like big ends... however, without a looky we can't tell

Does it only do it whilst moving? Could it be the prop by any chance. On this engine IIRC the engine is as it should be in the bike, right? The bike is prop driven, could it be this?

As this engine is pretty rare in a BEC finding a solution may be slightly more difficult than the rest of us with BEC's.

Big ends don't suddenly go (in my limited experience...), I had a car that sounded sweet as a nut when cold but when it got hot & the oil thinned you got the bigend knocking.
I'd do a spanner check right down the transmission - a loose joint anywhere could sound like this.
be lucky!!!!
Bob
re read initial post - oil everywhere - that don't sound good

[Edited on 28/5/06 by Bob C]

Thanks guys,

In order, yeah andy, sounded serious enough to make me stop! Sump is a GPZ900, straight swap for the standard.

Chris, not sure about oil pressure. Will re-fit sender and find out!

Ned, could be?!

Hellfire, nope, does it when stationary on tick over! Engine is wrong way round, longways, and normally chain driven.

Bob, I think I'm unlucky!

it's up on axle stands, so I can re-fit oil pressure sender, then if it's ok / non existant going to drop the sump and have a look.

Cheers

Mike

I have killed 2 car engines and when the big ends went, they went quickly...

Sounds fine on idle, but when you open throttle the knocking starts...

Big ends and mains are the first sign of oil starvation, as they require the most oil to stop the shells meeting the crank due to the load on them...

Sounds bad...

If it are the big ends wy would then the oil be everywhere??

also my opinion is that this is just no starvation!! not??

what would happen if the oil pressure was skyhigh..?? would it then spoil out of that place??

cant the head oil return channel/bore be blocked??

have no idea but the bigend and the oil everywhere cant see the conection also if the big end gets play, then the piston will hit the valve pretty much soon right?/

Tks

quote:

---

Originally posted by tks
If it are the big ends wy would then the oil be everywhere??

also my opinion is that this is just no starvation!! not??

what would happen if the oil pressure was skyhigh..?? would it then spoil out of that place??

cant the head oil return channel/bore be blocked??

have no idea but the bigend and the oil everywhere cant see the conection also if the big end gets play, then the piston will hit the valve pretty much soon right?/

Tks

---

Oil from the breather, it must be over pressuring the crankcase, sounds like a piston, having blown the oil out it would then run the bearings anyway.

How are you getting on Mike? Has Yvonne fell out with you yet?

If you get the spare engine you can stash it at mine if you want until i have to move out. There is also an engine crane in my garage if you need it (hanging from beam type). I can make my garage available to you if you need it, its just a shame im a few miles away.

Let me know if i can help in any way.