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  #1   IP: 24.152.132.140
Old 09-02-2018, 11:57 PM
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Finding TDC the easy way

A while back we had a tool concept for finding the compression stroke in a cylinder, critical when setting timing from scratch, without peering or inserting anything into the spark plug hole. Remember this?
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Well it struck me as a pretty cool idea so I finally got around to making one and testing it out. I sacrificed an old spark plug by breaking off the porcelain, drilling out the electrode and grinding off the arm on the bottom, added a balloon to the top, threaded it into the #1 spark plug hole finger tight only and turned the engine over by hand. Once you know you're on the compression stroke you view the crankshaft roll pin for vertical alignment.

Way cool.

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  #2   IP: 141.239.218.236
Old 09-03-2018, 01:40 PM
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Neil-
IF you decide to mass produce...
can we have a variety of color choices on the balloons?
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  #3   IP: 24.152.132.140
Old 09-03-2018, 01:50 PM
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Quote:
Originally Posted by roadnsky View Post
Neil-
IF you decide to mass produce...
can we have a variety of color choices on the balloons?
Yes, you may . . .
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Old 09-03-2018, 01:52 PM
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Quote:
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Yes, you may . . .
I'm ALL IN!
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Old 09-03-2018, 08:38 PM
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Very cool. Only thing I can add is that on this site you will either "learn" or get "entertained".
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Old 09-03-2018, 09:25 PM
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Very cool. Only thing I can add is that on this site you will either "learn" or get "entertained".

And that is why they call it enterlearnment!
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Old 09-03-2018, 10:15 PM
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You must also consider the oxygen permability of the rubber as to the accuracy of the device. More or less rubber thickness may distort the results.









:-)

Yes I'm kidding.
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