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Old 07-21-2008, 11:04 PM   #1
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Default Real head clearence

I'm looking for a way of checking head clearence of a new engine (before breaking). I normally just heat the engine up and bring the Piston to TDC take a measurement with my Calipers and then subtract the measurement of the burn chamber(button head). But it's extremely hard to get a new engine to TDC. I don't want to damage the engine. Any ides would be greatly appriciated.


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Old 07-22-2008, 12:15 AM   #2
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Normally I push a piece of solder (1mm thick) though the plughole. Bend the endtip a bit so you can get it between the head and piston. Just turn once the piston through the TDC and take out the solder, the flatened sides on the solder is marking the thickness of the real clearance.
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Old 07-22-2008, 07:06 AM   #3
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Quote:
Originally Posted by Roelof View Post
Normally I push a piece of solder (1mm thick) though the plughole. Bend the endtip a bit so you can get it between the head and piston. Just turn once the piston through the TDC and take out the solder, the flatened sides on the solder is marking the thickness of the real clearance.
That's what I do. The only problem with that is it doesn't take play in the rod into account but that is a whole different story.
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Old 07-22-2008, 10:35 AM   #4
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True, but the play on on the crankpin of a new engine is nothing more than 0.02 - 0.04mm, beside that, if you want to take care with this then you also have to take care of the flex in the conrod and crankshaft what on full speed can make a 0.2- 0.3mm difference.....
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Old 07-27-2008, 04:37 AM   #5
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The solder trick does work, but getting the piston to TDC has been tricky, so I took and cut a small piece of solder and laid it on the top of the piston, then rolled the crank all the way over then took the piece of solder out and got my measurment.
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