When you are measuring any cylinder bore you are looking for three things, bore size, taper, and out of round. In this episode of DIY, Davin demonstrates how all three can be quickly and accurately measured using a dial bore gauge.
How to use micrometers:
#DIY #DavinReckow #DialBoreGauge
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Likes: 954
Views: 13605
What brand dial bore gauge would you recommend? Lots of chinesium crap out there
Yes sir thanks for the video really helps! 🙏🏼
Just started my build and I am not even done taking it apart. The part I am most excited about is defenetly rebuilding the engine.
Interesting to see slightly different approach. What I do is I set micrometer to what bore size is suppose to be, 'zero' bore gage on it and then measure like in video: two measurments perpendicular to each other where rings are in TDC, then again in half of piston travel and where rings are at the bottom of the stroke. This way the reading shows how much bigger the bore is if from what it is supposed to be. This doesn't matter really, just my simple brain has less thinking this way.
Can we get links to your micrometer sets? Please and thank you.
I noticed the bore gauge is Fowler.
But what about the Micrometer set, and telescopic gauges? Much appreciated 🙏
This is the high quality content I'm subbed for, more Davin please!
measure once, cut twice; measure twice cut once. That old chestnut might be good for woodworking,
BUTT,
for the REPEATED precision needed here, (remember you have to match ALL the cylinders) you need to be ready to take a lot of time,
AND,
document . . .EVERYTHING!!
It is a very good idea to have a notebook to write all this stuff down in.
Part numbers. measurements, actions taken, discussions with machine shops, etc.
It's not just essential for the rebuild, you WILL need that info if anything goes wrong, and if you want to sell it down the road, that sort of documentation can really sweeten the pot.
I would like to see how Davin keeps track of all this.
Congrats and thanks Mr Davin! 👏🏻👏🏻👏🏻👏🏻
When I was using them in powertrain development we measured on the wrist (gudgeon) pin axis and at 90 degrees to that axis. The major wear in the cylinder is perpendicular to the pin axis. Measuring at 45 degrees to the pin axis will not capture the maximum wear which means you could order the wrong pistons. Always set the micrometer to the bore nominal and work off that. Measuring at some arbitrary point in the bore means you have to do a whole bunch of calculation to arrive at just how far out the cylinder is from nominal. The machine shop only cares how big the bore is so they know what size the new piston needs to be. They bore and hone to the pistons plus running clearance
the thing is, the machine shop will look at the largest bore measurement as the single most important measurement.
Indication of taper and out of roundness are factors,
butt,
that sort of data is actually more useful in diagnosing the current condition and past history of the engine.
Ultimately, once the block is to be re-bored, they will be bored and honed to the smallest diameter that will clean up the largest measured diameter and still be "in-spec"