Are The 1g-fe Cyl Surfaces Coated?

[SpOcK]

This is sort of a "deep" question...

I'm interested to know whether the 1G-FE's cylinder surfaces have some kind of coating, or not? I'm about to order custom forged pistons (now that I have a model, thanks Daz ;)), and to decide whether to order the pistons with std measurements or 0.5 over-size, it's cruacial to know will I be able to bore the block if needed. If there's a coating, it wouldn't be a good idea to bore the block...

Hopefully someone has any info on this.

Cheers,

Sami

[Dave-Ellen]

I had mine overbored by TDi. I'm sure if there would have been a problem he'd not have done it.

I'm getting my own rods & pistons made BTW.

Pistons appear to be complicated so take care...something about the type of rings to use which is linked with emissions etc.

Rods are OK as they've already done a set for a IS200 in Italy !

[SpOcK]

I had mine overbored by TDi. I'm sure if there would have been a problem he'd not have done it.

I'm getting my own rods & pistons made BTW.

Pistons appear to be complicated so take care...something about the type of rings to use which is linked with emissions etc.

Rods are OK as they've already done a set for a IS200 in Italy !

←

Thanks Dave, I knew I could rely on you (to get a rapid answer, or, to get an anwer at all... ;))! :)

If it's not a state secret, could you PM me where are you getting your pistons done? As we might just do a "mini-goup-buy"...

I'm going to have my rods done here locally. A guy who has done them for race cars for over a decade, so he prolly knows what he's doing...

Now that I've seen the IS200 std rod, I understand why it's said to be the weakest link in 1G-FE. THEY'RE THIN AS A MATCH!!!?!

[MartinC]

Aren't coatetd bores generally associated with aluminuim blocks, the IS uses a iron block so I don't think there is any need

[RoadRash]

The block is cast iron, the Head is Aluminium. :)