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You're exactly right no the accuracy. The tolerances in the xray suites were also + - 1 mm. That was more much more accurate than a straight laser and much cheaper than a rotating laser, at least at that time. There's another good use for tubing and that is to track down noises. You can...

I never thought of using this method to get an indirect compression bypass test, but I did use a long piece of clear tubing for a level when I installed xray suites. I kept a piece of tubing that was about 30 feet long, fill most of it with water, and then you can use that to level any point of...

I really like Guyfang's suggestion of how to check compression indirectly by measuring crankcase pressure under different conditions. That should be a relatively easy and inexpensive quick and dirty way to get an overall impression of how tight the compression is based on how much bypass the...

I tend to agree with Guyfang, when it's trying to start, I get the feeling it's a compression issue on one of the cylinders. It just seems like one cylinder isn't wanting to fire when you spin it over and the other cylinder is firing well. Once it starts it sounds great. Guyfang can...