Wiseco Piston Pics and Comments

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Fit may get even trickier if they make them for the older saws with "A" and "B" size cylinders.

The meteor site lists several size slugs for each model and they suggest you mic the cylinder before ordering. If I remember correctly they vary by 0.01 mm (ca. 0.0004").
 
Did Wiesco ever RUN these slugs in saw?

Or just make them and let come what be?

From Wiseco's Rep who i delt with.
We don't manufacture pistons for chainsaws.
We need to know the original piston clearance.
What temp they may get up to. They need to know
these things to help with there enginering dept.
so there won't be any failures. There forged pistons
have a much different expansion rate than a cast
piston. In my experience forged pistons always need
more clearance no mater what the engine is.
I don't believe Wiseco would manufacture a piston
and just throw it in someones lap without knowing some spec's. If the information that was given to Wiseco was incorrect then any failures would be in the lap of the original person who placed the order.


Lee

Lee
 
The accuracy of calipers when used like that is about the same as the clearance, making them unsuitable for determining the clearance in that application.


.

what is a reasonably priced bore gauge?
 
Here's the piston polished up. There are no signs of the scuffing. According to the calipers, I didn't really remove anything, just polished it up.


This is the intake side the had the worst wear.

797177256_FmE4i-M.jpg



And the exhaust side.

797177237_Dxj9t-M.jpg
 
Here's the piston polished up. There are no signs of the scuffing. According to the calipers, I didn't really remove anything, just polished it up.


This is the intake side the had the worst wear.

797177256_FmE4i-M.jpg



And the exhaust side.

797177237_Dxj9t-M.jpg

How did you polish it?
 
Leeha, I agree with your train of thought. Bailey's is a great company with an excellent service record, but they seem to need a trained engineer on staff to communicate the spec's of engine components. It's a specialized task, if they are using anyone other than someone who has specialized training in this field then they are asking too much of the individual and placing the customer potenially at risk. I wouldn't ask a saw mechanic to do it, as good as one may be, there's alot more to it than meets the eye, the communication and language between engineers, whether it be software, civil, mechanical or whatever is usually different than what someone outside the field would be in my observations of product development processes.
 
where can you buy em?

Enco or MSC industrial supply will have them. The easiest way to set a dial bore gauge is with a ring gauge or gauge blocks with ends. A micrometer will do, it just takes longer. Companies like Sunnen make fancy bore gauge setting machines that are real easy to use, although very cashy.
 
Enco or MSC industrial supply will have them. The easiest way to set a dial bore gauge is with a ring gauge or gauge blocks with ends. A micrometer will do, it just takes longer. Companies like Sunnen make fancy bore gauge setting machines that are real easy to use, although very cashy.

Ring gages are expensive and you will need the mic to measure the piston.
 
Enco or MSC industrial supply will have them. The easiest way to set a dial bore gauge is with a ring gauge or gauge blocks with ends. A micrometer will do, it just takes longer. Companies like Sunnen make fancy bore gauge setting machines that are real easy to use, although very cashy.

Snap gauge for the bore and measure that with a precision Mic, the same one used for the piston.
 
Leeha, I agree with your train of thought. Bailey's is a great company with an excellent service record, but they seem to need a trained engineer on staff to communicate the spec's of engine components. It's a specialized task, if they are using anyone other than someone who has specialized training in this field then they are asking too much of the individual and placing the customer potenially at risk. I wouldn't ask a saw mechanic to do it, as good as one may be, there's alot more to it than meets the eye, the communication and language between engineers, whether it be software, civil, mechanical or whatever is usually different than what someone outside the field would be in my observations of product development processes.

Not to mention, if something bad happens and there's not a Professional Engineer signature on it really would be unfortunate for Bailey's.

Jack
 
I put another tank of fuel through it this afternoon and pulled it back apart. It's still trying to scuff a little, but nothing like it was before. I'm going to get a little more aggressive with the land above the top ring since that's where most of it's occurring. I'm not impressed so far.


Intake

797658792_Zbm7e-M.jpg


797658809_GpJnf-M.jpg



Exhaust

797658840_m9rW5-M.jpg


797658939_hXqQ9-M.jpg


797658922_fxhuy-M.jpg
 

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