Wrist Pins.......

[srcarr52]

Think I can take 6g of mass off this meteor piston safely?

Yup, but you can take 6g off the stocker safely too.

 

[Adirondackstihl]

Yup, but you can take 6g off the stocker safely too.

Hey Shaun!
Just lookin to get this Meteor down to OEM weight. I’d be happy there.

 

[Al Smith]

Well now if you stop and think about it who has seen a pin failure ? I haven't on anything .Piston failure yes .Rarely a rod but how can you really tell because if it comes apart that bad usually the piston will be just a pile of little aluminum scrap so how could you tell ?

 

[Sty57]

Do any of you guys think you could use a tapered reamer to lighten the pins?

Or would they be to hard?

 

[Stump Shot]

Do any of you guys think you could use a tapered reamer to lighten the pins?

Or would they be to hard?

I was told to absolutely NOT to try this, as it would ruin the balance from not being absolutely perfect. Would cause more harm, than it did good.

 

[Sty57]

I was told to absolutely NOT to try this, as it would ruin the balance from not being absolutely perfect. Would cause more harm, than it did good.

The balance of what? The whole rotating assembly?

The oem ones are tapered and the AF ones are straight.

 

[Sty57]

I would think putting heavier parts in would do more harm than good.

 

[Jimmy in NC]

Balance... who was it that made a full circle crank.... No balance there.

These factors are all real but I wonder if the order of magnitude is great enough to warrant consideration.

On the flip side I have heard lightened slugs cause a saw to spin up much quicker...

Sent from my SM-G955U using Tapatalk

 

[Stump Shot]

The balance of what? The whole rotating assembly?

The oem ones are tapered and the AF ones are straight.

The Piston left and right

 

[Sty57]

Balance... who was it that made a full circle crank.... No balance there.

These factors are all real but I wonder if the order of magnitude is great enough to warrant consideration.

On the flip side I have heard lightened slugs cause a saw to spin up much quicker...

Sent from my SM-G955U using Tapatalk

I have to believe anything that's lighter on the small end of the rod will help. It's all reciprocating weight not rotating weight.

 

[Sty57]

The Piston left and right

If the measurements of the ID is the same after reaming them. I'm guessing it would be very close to the same from side to side.

 

[Sty57]

And if it's a race saw.....let'er rip tater chip!

 

[Deets066]

I was told to absolutely NOT to try this, as it would ruin the balance from not being absolutely perfect. Would cause more harm, than it did good.

If it was machined the same on each side...

 

[twinstaged]

has anyone checked a pin for hardness? Are they just case hardened and soft inside or hard tool steel throughout? Reamer will probably *s-word the bed trying to cut something 50-60 rockwell. It's essentially a bearing race after all.

 

[Deets066]

has anyone checked a pin for hardness? Are they just case hardened and soft inside or hard tool steel throughout? Reamer will probably *s-word the bed trying to cut something 50-60 rockwell. It's essentially a bearing race after all.

I have a baby boring bar, just not sure if it's small enough.

 

[twinstaged]

Good carbide or ceramic will cut it for sure if things are rigid and setup right. I don't have a burnt up pin here or I would file test one.

 

[Al Smith]

Keep in mind you have to chuck up the pin to bore it out without harming the finish of the pin .With hard steel that isn't all that easy to do .All that forkin around if you really wanted a lighter pin use the OEM pin to begin with IMO .
This remind me of turning an 038 AV into a mag when it's a lot easier to just start out with a mag to begin with which in reality they made more of than the AV's. Different strokes for different folks though .

 

[Al Smith]

Now,hard steel .I cut the shaft down from a Ford water pump bearing to repair a Chevy 292 in line 6 .Being powdered metal it was so hard C2 carbide inserts would not cut it .It took ceramic .

 

[Deets066]

Now,hard steel .I cut the shaft down from a Ford water pump bearing to repair a Chevy 292 in line 6 .Being powdered metal it was so hard C2 carbide inserts would not cut it .It took ceramic .

Would t it just have been easier to buy the right part?



Sorry bud, had to

 

[twinstaged]

Keep in mind you have to chuck up the pin to bore it out without harming the finish of the pin .With hard steel that isn't all that easy to do .All that forkin around if you really wanted a lighter pin use the OEM pin to begin with IMO .
This remind me of turning an 038 AV into a mag when it's a lot easier to just start out with a mag to begin with which in reality they made more of than the AV's. Different strokes for different folks though .

Lots of ways to chuck it up without harm, but yes this is definitely an exercise in having thousands of dollars in machinery/tooling to save $20. However being that guy with thousands of dollars in tools... somedays it's better to waste my time making and fixing then buying... fine line though most days lol. Especially after you F up an expensive micro bar being a cheapskate