Wrist pin bushing material
Wrist pin bushing material
(OP)
Is C93200 bearing bronze the only suitable material for a wrist pin bushing? The specific application is for a 450cc motorcycle engine. The original design never included a bushing which will be the driving design constraint due to limited material removal from the connecting rod. The purpose of adding a bushing is to avoid splitting the case and replacing the rod. What is the typical range of a wrist pin bushing wall thickness?
Thank you
Thank you





RE: Wrist pin bushing material
Glacier is a supplier I remember
http://glacier.de/products.php
RE: Wrist pin bushing material
RE: Wrist pin bushing material
The original Honda four rods were bushing-less, and a misery to machine even with carbide tooling using a dedicated Tobin-Arp rod boring machine.
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RE: Wrist pin bushing material
RE: Wrist pin bushing material
Tmoose - I have considered using a brake cylinder hone and slowly increase the bore diameter. This isn't a practical solution anymore considering I will need to remove .050"+ of material. By any chance do you know what alloy the Honda rods are cast from?
Smokey44211 - Why would the classification of fit effect load capacity.
After what I read today, I'm realizing adding a bushing is adding a potential failure. I think the best approach is to replace the rod or recoat the bore and then hone to size. Thank you for all the help.
RE: Wrist pin bushing material
The fit influences the level of support for the pin. If it is tight it can't flex and is less subject to fatigue as a result. Of course it is still subject to about the same shear at the edge of the rod bore.
Regards
Pat
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RE: Wrist pin bushing material
Due to the fact I'm adding a new variable into the system I have considered drilling a small hole on the top of the connecting rod to allow oil to better lubricate the wrist bin and bore. I'm fairly convinced the hole will have very little if any affect on stress due to a decreasing non linear acceleartion as the piston travels from 270 degress to top dead center. I have thought about how to calculate the acceleration, but since I believe it to be non linear I haven't any idea how to start.
RE: Wrist pin bushing material
Norm
RE: Wrist pin bushing material
RE: Wrist pin bushing material
Rod
RE: Wrist pin bushing material
I worry about hydrogen embrittlement on plated high stress parts.
http://www.finishing.com/82/54.shtml
I'd check the rod for straightness (2D). One method is against the crankcase base with a LONG wrist pin. It's pretty good if the cylinder bore is proven perpendicular the base gasket surface, and the BGS is parallel to the crank CL.
RE: Wrist pin bushing material
If I where to electroplate, I would hone to slightly over sized then plate with silver to required size. I am thinking in terms of microns or tenths of a thou. Hydrogen embrittlement is a real problem that would need to be addressed.
Regards
Pat
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RE: Wrist pin bushing material
I was concerned nickel might not have ideal yield properties due to such a high modulus of elasticity. Thank you for the conformation. Back to research.
RE: Wrist pin bushing material
RE: Wrist pin bushing material
Out of curiosity, is this the old '60's Honda CL/CB450 450cc DOHC engine?