ORIGINAL: flhyr
Wow , ease up motorman
, You got some issues eh? I added head shims after working with the hobby shop and advise from people on this forum after having the problem of over heating. If by guru you mean smart enough to put a themrocouple on the head to measure tempreatures and determine that by adding head shims I could lower the enine temps and stop burning out glow plugs, then yes.
Compression compared to when it was new, and from when its cold to just run for 5 or 10 seconds, thats what I'm comparing it to. I don't think that 8 thousandths of an inch added in head height would change the compression ratio enought to feel, but if I'm wrong I'm sure someone will let me know. This problem showed up even before I added the shims.
Again: cold with the added head shim = good normal felt compression, run for 5 seconds = mush, no pop, even stops at TDC when hand flipped, impossible to start by hand.
I have checked the tighness of the glowplug when cold, and even sprayed some bubble solution aound it and flipped it a few times, no bubbles. But this was when cold not hot.
Maybe I was a little rough on you, and no I do not have any issues that I am aware of.
The .008 th's shim that you added is enough that you would definately feel the difference in compression with your bare hand. There is no reason why you should need the shim to keep it from over heating running 10%. I would start by making sure you don have a air leak at the carb base or back cover first. Then I would make sure that the engine is getting enough cooling air if it is cowled. Just because someone told you on here to add a head shim, does not mean that is the correct thing to do.
I believe about about half of what I read on hear when it comes to having to do a mod on an engine because it will not run correctly from the factory in its intended application.