James-26 Posted June 28, 2010 Report Posted June 28, 2010 When I check my piston to wall clearance I flip the cylinder up-side-down and install the piston as it normally would be. I then force the piston all the way to one side of the cylinder and insert a feeler gauge between the cylinder wall and piston skirt. I'm on 64.75mm bore and my piston to wall clearance is around .001 to .002 I have read that my clearance is to tight and I have also read that I'm just right. What do you guys think should I get my cylinders honed out so I have around .003 to .004 or stay where I am? Quote
bansheesandrider Posted June 28, 2010 Report Posted June 28, 2010 When I check my piston to wall clearance I flip the cylinder up-side-down and install the piston as it normally would be. I then force the piston all the way to one side of the cylinder and insert a feeler gauge between the cylinder wall and piston skirt. I'm on 64.75mm bore and my piston to wall clearance is around .001 to .002 I have read that my clearance is to tight and I have also read that I'm just right. What do you guys think should I get my cylinders honed out so I have around .003 to .004 or stay where I am? That is a really inaccurate way of doing it. You should be using a bore gauge or inside micrometer to measure the cylinder, and you should be using an outside micrometer to measure the piston. If you are using Wiseco pistons you also need to know the correct place to measure them as they are oval shaped when they are cold and when they come up to temperature, they become round. This is because they have a steel strut in them that controls expansion. 1 Quote
tedd1 Posted June 28, 2010 Report Posted June 28, 2010 Read >HERE< , first paragraph explains how to measure clearance. You'll need one of >THESE< and some of >THESE<. Quote
bansheesandrider Posted June 29, 2010 Report Posted June 29, 2010 Read >HERE< , first paragraph explains how to measure clearance. You'll need one of >THESE< and some of >THESE<. A dial caliper is not nearly as accurate as an outside micrometer, ther is to much flex in the mechanism and jaws that do the measuring. A dial caliper is great for quick and easy measurements to get an idea of the general size of things. Quote
jbooker82 Posted June 29, 2010 Report Posted June 29, 2010 A dial caliper is not nearly as accurate as an outside micrometer, ther is to much flex in the mechanism and jaws that do the measuring. A dial caliper is great for quick and easy measurements to get an idea of the general size of things. Yep probably just as accurate as using a feeler gauge when checking bore's. It is better than a ruler though. Quote
banshee67 Posted July 6, 2010 Report Posted July 6, 2010 my family has always used a simple feeler gauge and we have never had any problems. Quote
SLORYDER Posted July 6, 2010 Report Posted July 6, 2010 my family has always used a simple feeler gauge and we have never had any problems. Banshees are likely different than what you are accustomed to. Quote
Powerstroke Posted July 7, 2010 Report Posted July 7, 2010 No idea about the spec but I have no problem with the feeler gauge method. I would recommend putting the feeler gauge in the cyl then putting in the piston and go by feel removing the feeler gauge. Quote
SLORYDER Posted July 7, 2010 Report Posted July 7, 2010 I'm going to go ahead and say that the .001" feeler may be close to accurate in this application. .004 or so and there will be a noticeable amount of loss of feel due to the curve of the bore. If you truly believe it is .001 and the piston spec is .004, I'd hone it out to .004". Better loose than tight. And if you have any doubts get a machine shop to check it. Quote
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