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Fuel prices in the UK are currently running about $2 USD per litre, having topped out around $2.20 at the maximum. :mad: Graham

I don't think the suggestions given warrant a reply like that. The OP asked a question about countersinking using countersinking bits. Some useful information was given about countersinking bits in the replies, and there was also some alternatives given, which depending on the quality of output...

Heres some standard countersink bits for metric bolt sizes. M3 -> 6.3mm countersink bit M4 -> 8.3mm countersink bit M5 -> 10.4mm countersink bit M6 -> 12.4mm countersink bit M8 -> 16.5mm countersink bit M10 -> 20.5mm countersink bit Graham

Standard Jobber drills are 118 degree point, whereas proper countersink bits are 90 degree points. Using standard drill bits to make countersink holes is just going to leave a gap underneath the head of the screw, with only a small contact patch at the base of the screw. It would work fine if...

Ahhh, that explains a few things for me too :) I had incorrectly assumed that a glow plug engine was just a spark engine, but using a different type of plug. :) I should really know these things, as my current engine build is a glow..... That's another fundamental build mistake avoided :)

Hiya, the idea of the taper is so that when the piston is rising and the compression is getting bigger, the fit gets tighter and supports more compression., and as the piston lowers, the fit gets looser and the friction is reduced. I guess if your fit is good enough to give excellent compression...

Samuel. I machined the inner bore of the cylinder liner down to just short of 0.5" with a boring bar. I passed a 0.5" reamer through the hole to give me a better finish than my boring bar could give me. I then chucked up a 0.5" Acrolap Barrel Lap in the chuck and hand lapped in the liner...

Hi, Might be worth checking out Wikipedia and google for how compression ignition and diesel engines work. Basically when the piston compresses the mixture, it reaches enough pressure/temperature that it self ignites.

Samuel. No it is a compression ignition "diesel" engine.

If anyone is interested, here was my BollAero18 on first run. Video (I hope that link works) ;)