Info on oil

[GTR-Dad]

He made another glaring error in saying that pistons and blocks would expand at the same rate.

Even when materials are have identical thermal expansion coefficients the conductivity of the block sucks heat away from the cylinder bore quickly and the piston heats up faster. Sled guys actually have a term for when you load the engine too hard cold and end up welding the piston to the block.

Dan

[collector240sx]

He obiously had to cut a couple of corners, and for most application
the info is acceptable. But feal free to correct any misleading info.

I choose not to change anything in the original text, by respect
to the original author. It might not be perfect, but he's the one
who wrote the whole thing, and I have to give him credit.

I might be adding some info next summer,depending how things go,
I want to do some test on a couple of brand of oil. Since all the info
I have are from a study in australia, and there is actually some
difference in oil depending the region of the world it's made for.
For exemple, if you look at some bottle intended for the north
american market, on some bottle you can read in the fine print,
that it's sale is prohibited in all other part of the world. Now I
can't say what or if there is a real difference, but I can at
the very least take actual test of the oil available here in canada.
I don't understand why I'm having so much difficulty finding
actual test data, it's so easy to do, and suprisingly not that
expensive. If you compare it to the test oil compagny use. lol

Please feel free to had any info, don't be shy to go in more detail.

Thanks
J-F