Whats silver, and shiney, and bent at all funny angles?



Thanks again Andy for coming over yesterday, shame it didn't work, but it did get me home, which was the main concern! Now I just need a new car/engine

Andy also hopefully has some pictures from the piston and head... which are slightly less shiney than before.

Whats lovely and round and in the back of that picture????.....
A larger than life poster!!!

Cheers Adam

Bugger, this sucks! Although speaking to you on MSN you seem to be having dirty thoughts involving a 480 Turbo Maybe in the future she can be renamed to 'Fast Kar'

As an aside...

340GLT wrote:Whats lovely and round and in the back of that picture????.....
A larger than life poster!!!

Had me in stitches....

Lol I mean its not like anyone would miss them but i thought i would emphasize it a bit!!! lol
Cheers Adam

Ouch! I'm not even gonna ask how that happened!
This is what happened to my no.3 exhaust valve when my cambelt snapped last september:

...but you win on bent bits of engine. For a spark plug to get itself mullered? Something definately aint where it should be. I feel for you dude, hope you get back on the road soon...

Yeah, here are some pictures. Still can't get a handle on what's caused it. Was it detonation? Pinking? Foreign object?

Here's the head:


Here's the block:


Here's a close up of the problem piston:


Oh and Chris, no probs, you helped me out too, got some more VE bins sorted.

That looks like detonation problem. http://www.pukema.com/kuvat/naku.jpg There's a piston which has suffered detonation and your piston looks a lot same.

I have an engine crane if you decide it's time for 'Fast Kar' to become a reality

If you need it I have a good spare 1.7 that I dont need.

Lets play 'how many engines can you fit in Fioner'

why would you only get pinking in 1 cylender? sparkplug fooked could do it i spose

Right, save me feeling like an idiot.... what is detonation/pinking exactly? Is there a difference between them?

And does that 1.7 have a turbo bolted to it Dai?

My money is on a foreign object looking at the damage pattern, but that doesn't immediately explain the knocking sounds...which tie in more with a bent rod, one of the likely symptoms of severe pinging.

What doesn't make sense is how detonation that severe could happen on just one pot on a single carb engine.

cheers

James

if the saprk plug wasnt working you'll get detonation eventuallly

its basically when the explosion is caused before the spark plug has lit up, often during the compression stroke, and means that theres a mass of pressure at the wrong time which cant escape

I don't know how detonation happens in just one cylinder but it seems that it can happen.

http://www.pukema.com/kuvat/mannat.jpg

Here's a pic of all of those pistons from Pukema's B19. First piston had suffered detonation as can be seen. No foreign objects in the engine. Though I'm not sure if those were pistons from B19ET so it might have been a turbo engine.

Those marks on your cylinder head look also a lot like they would have caused by detonation because sharp edges in combustion chamber will increase detonation risk and both marks are on sharp edges.

Well. I don't know. It could have been a foreign object too..