The aftermath (dropped valve pics)

[The Fatty]

that is some scary s**t! now im nervus to drive mine..! Does anyone have any idea yet as to how many cars this has happened on?!

 

[The Fatty]

P.S - From you pictures it looks like the value has been broken/snapped and not just fallen - surely that would indicate a timing problem? also if it just broke, how would 1 piece values help?

 

[Jackpilk]

Well since I've had it the engine has run faultlessly and the belts were done 8k ago, so if the timing was incorrect I'm pretty sure it would have let go a lot sooner. If you look closely on the picture '3' of the 2 valve stems , the one on the right you can see at the bottom of valve stem there is a slight colour change that's where the 2 piece valves are friction welded together. Having one piece valves would eliminate that weak spot.

 

[The Fatty]

Oh yeah I can see what you mean! its like the perfect setup for a horror story..! Are the majority of valves (in all cars) made in this way?

 

[Jackpilk]

Highly unlikely, I don't know why they didn't use one piece.

Anyone know if the Ph1 172's have 2 piece or 1 piece?

 

[Chip-mk1]

Are the majority of valves (in all cars) made in this way?

Yes almost all modern cars have the valve heads friction welded to the stems.

 

[BRT Motorsport]

The machining marks on the inlet like porting on your pics is this the same on all sport heads or just certain models

 

[Silent_Scone]

ergh, no way of knowing

 

[BRT Motorsport]

Mine has the same marks on the inlet ports as if it was ported, but not all inlets I've seen have been the same

 

[Laine_16v]

I dropped 2 exhaust valve heads on cylinder one, engine was a wreck as expected. Although they were not original OE valves (they were pattern parts)

 

[LIL B]

Bit of liquid metal, job done.

 

[Yellow Dave]

The machining marks on the inlet like porting on your pics is this the same on all sport heads or just certain models

My standard 182 head looked like this
http://www.cliosport.net/forum/showthread.php?559324-are-182-heads-ported-as-standard

 

[172bruce]

really sorry to see this great pics of the damage tho. gotta be new engine time?

 

[Adamm.]

damn I thought I had bad luck.

 

[Jackpilk]

New engines in and running like a dream. Apart from now It's failed it's MOT , 2 cracked front springs, could have been much worse though.

 

[Marky_]

That is catastrophic!

 

[Laine_16v]

Spot the spark plug...

 

[Jackpilk]

Is that it under the valve on the right!?