Engine failure on track day, need some help, T4 GB 2.0 head failure Options

[CheeRS]

Hi, here is my presentation post :

http://www.914world.com/bbs2/index.php?showtopic=337989

two weeks ago I was in Monthlery near Paris France, for a wagenfest with my 914.

Get some troubles with the engine, a hammer noise and the engine stopped smoothly like out of gas.

here is what I found :
https://drive.google.com/open?id=1gzsWwNBOh...86Kbof2P4BCHHrm

some pics

[r_towle]

no head seal (gasket) needed.
You can lap the cylinders to the heads to get a good seal.

Without that Head Temp Sensor, its possible that you ran too lean.
Thus, you dropped the valve.

Good luck with the new rebuilt heads, they may work out, but using old head tends to be a gamble (one I do all the time)

rich

[CheeRS]

no head seal (gasket) needed.
You can lap the cylinders to the heads to get a good seal.

Without that Head Temp Sensor, its possible that you ran too lean.
Thus, you dropped the valve.

Good luck with the new rebuilt heads, they may work out, but using old head tends to be a gamble (one I do all the time)

rich

Bonsoir, what do you mean by lap the cylinder to the head ? (I'm French) (IMG:style_emoticons/default/beer3.gif)

[porschetub]

no head seal (gasket) needed.
You can lap the cylinders to the heads to get a good seal.

Without that Head Temp Sensor, its possible that you ran too lean.
Thus, you dropped the valve.

Good luck with the new rebuilt heads, they may work out, but using old head tends to be a gamble (one I do all the time)

rich

Bonsoir, what do you mean by lap the cylinder to the head ? (I'm French) (IMG:style_emoticons/default/beer3.gif)

Use lapping compound same as used for doing inlet and exhaust valves,the sealing rings don't last and are no longer used ,have seen some cause heads to come loose and resulting leakage.
Google VW barrel to head lapping you will find more info as its hard to explain,been doing it on T1 motors for years the 914 motor needs it too.
Good luck.