I assume that your car had a rather expensive repair bill. Sorry to hear about that!
After looking at the magnified pic that you took, I wonder if this was stamped or pressed in a mold from a metallic powder alloy and then kiln baked - as many parts in the automotive industry are these days.
I hope you feel better mate.
Around $2000. Cylinder head is toast. :(
I feel sorry for the Chinese who buy these motors - the factory got sold and moved to China. They get sold in China as the Roewe 750 . The 2.2 and 2.6 litre motors are fine but the 1800i motor is a POS by design. Guess which motor mine has?
Pity BMW in the brief years that they owned Rover didn't just substitute their well sorted 1800 fuel injected motor for Rover's sabotaged on the drawing board design. Not to mention the German made porous cylinder castings - they built what was designed - which is a pity. The diesel motor was a BMW engine - the petrol (gasoline) one wasn't.
I think given Chinese labour costs it's more likely that it was machined by hand rather then sintered and stamped. Sintering and stamping costs an enormous amount in hardware. Machinists are very, very cheap...
Anywhere else on the planet (except maybe India) it'd be far cheaper to sinter and stamp it. I'd guess it is most likely hand machined. At what a machinist charges here they'd need to make about 8 of them an hour to cover their labour costs. I'd guess the factory makes that many of these per minute for the same labour cost.
Concerning the metal...
I've got access to a mass spectrometer at work, but that would entail vaporizing a small portion of the light - no good.
But...since the thermal conductivity of titanium is roughly one tenth that of a typical aluminum alloy, the easiest way to tell might be a simple "match"
So did I but it is nearly 30 years since I stopped being a chemist and I broke pretty much all of the stuff that got "borrowed" from the various places I worked in. The stuff in the loft belonged to my great uncle whose house this was - he bought the house outright in 1936 for 35% less than I spend a month on the mortgage payments for the same building. He was a chemist for the local soap manufacturer - "Soapy Ogstons".
The remaining gear ("gear" is the local junkie's euphemism for heroin BTW) in the loft is more than 70 years old so is calibrated in strange (To someone who thinks in SI units) units.
I can still remember trying to stay awake in all those sampling theory and methods lectures in 1979. Rather often, I failed to do so....
I could easily file some of it off and send the filings to you. If those filings contain iron at all - it is probably stainless steel. All we really need here is a crude measure of the elements present - if it contains iron, nickel, carbon and chromium, it is some sort of stainless steel. If it contains stuff that isn't Fe, Ni, Cr, or C then it is likely something else. Problem is that the file is also made of steel so will contain shedloads of Fe. And quite a few other contaminants. If it contains Ti at all then the game changes.
Problem is, titanium is to be found in almost every rock on the planet. The white pigment in white paint is titanium dioxide.
Now think about how easy it is to contaminate samples.....
Serious analysis gets complicated very, very quickly. Mass specs are great - but one does have to think very, very hard about how the sample was obtained - and what might have contaminated it. And how. Once upon a time, I did this stuff for a living and it is quite amazing how many excuses you (What I mean here is "I") can come up with for the "wrong answer"
Problem with neutron activation analysis so beloved of CSI and similar programmes is that they aren't aware of the limitations of methods like that which will faithfully record every element the sample has ever been exposed to. Especially those that it met in the lab....
[quote=Match]
But...since the thermal conductivity of titanium is roughly one tenth that of a typical aluminum alloy, the easiest way to tell might be a simple "match"
[/quote]
Gah! I'm quoting myself...that has to be some sort of sin. What I was trying to get at is just apply a little heat to one end of the battery tube, and if the other heats up fairly fast, then it's aluminum. Sorry if you had gotten that already from my previous post...long days at work are scrabbling the mind.
Control
C303 Low
C303 Medium
C303 High
Ultrafire C3 R5 single mode
Yezl S5 Low
Yezl S5 Medium
Yezl S5 High
And because I felt like it, my modded Mr.Lite J4 with an XM-L in it on high.
Got it today and I am 99% sure that it is anodized aluminum. Rear battery tube threads are of a lighter color and its surface is non-conductive. Will run density test soon.
Measurements done: 2.8g/cm^3, so it is an aluminum alloy then. Stainless f*n aluminum : ( The reflector looks like it could take an XM-L if you widen it just a little.
Thanks SPAMBOT, that was the second disappointment in two days. 
I got this one 2 days ago. It is chrome plated iron and my magnets are competing to get at it.
Not all grades of stainless steel are non-magnetic. Though most of the good ones are.
Having used the C303 while walking the assistant last night, I've decided I like it.
Not so sure the assistant did - she was very reluctant to get up this morning.
Hope you boiled it first - that finish could entrain an awful lot of air which would dramatically change the density.
Measurements done: 2.8g/cm^3, so it is an aluminum alloy then.
That's why I love this forum!
The finish on yours must be different than the finish on mine then. Mine has a very fine, rather shallow "ribbing" that does not trap any visible air pockets when submerged. It would need to trap large amounts of air in order to skew the results in any significant way. I did not screw up the test.
Anyways, Manafonts "stainless" description is just plain wrong, or plastic counts as "stainless" too.
So I finally modded it with a new switch, a standard black one with a shortened spring, in addition to the XM-L mod and new driver + orange switch boot. It is actually a nice light, and the post non s/s discovery disappointment is now almost gone : )
Just as well it isn't SS with that sort of output - aluminium is far better at dissipating heat.
Hi everbody, I am new in this forum and just began to collecting a few flashlight. I hope this new hobby won't spend my wallet a lot 
I want to ask, can this flashlight take AW's 18650 2900 mA?
Thanks
Aloha and welcome to BLF sugiarto!
If you're talking about the UltraFire C303 then YES it should handle an AW 18650 2900 mA.
Not sure about the battery, just wanted to say welcome to BLF Sugiarto! Enjoy your hobby here!
To : fishinfool & sb56637
Thanks for the info and warmly welcome