2"-3" inside micrometer
Ulix Goettsch wrote:
> For any newcomers to the story, I built a 1380cc street motor for my Sprite
> that sounds somewhat like a Diesel since I first fired it up. A knocking
> that doesn't sound like a rod knock, and isn't as severe either. Once the
> engine is warm, I don't hear it with the top down. With the hardtop on, I
> do hear it and it doesn't sound good.
>
> Piston slap due to too-large a bore has been suggested as a possible
> culprit. I did not check the bore diameter before I assembled the engine
> because I did not have a tool accurate enough for this.
>
> Today I pulled the head off. The bores look good, not scraping.
> I want to check the bore size.
>
> What tool should I use to check it, would good calipers be good enough? Of
> course I could only measure right at the top.
>
> If this wasn't enough of a problem, I also found that the head gasket is
> blown between cylinders 2 and 3.
> I specified the block be offset bored, but Vizard says for 73.5mm, this
> isn't even necessary. The head was milled, the block was not (I regret that
> now). I used a copper headgasket from APT. Some say that the Metro Turbo
> headgasket is superior. Any opinions?
> I plan to measure the thickness of the wall between number 2 and 3, does
> anyone know what the minimum safe thickness is?
>
> If the bares are within spec, the pistons will come out and I'll check the
> wrist pins and bearings. :-(
>
> Ulix (wish I had just built a stock motor with a 266 cam...)
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