Camshaft bronze
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Thanks for the replies. It is actually for the camshaft of a single cylinder motorcycle. Whatever the current bushes are has worn the shaft so I was hoping for something that was going to be easy on the shafts which I understand leaded bronze would be.
I have been unable to find the composition of LB10
The only leaded bronze that I can get is LG2 gunmetal which is Copper 85%, tin 5%, zinc 5% and lead 5%. It is listed as suitable for light loads at low to medium speeds so I am not sure if it is suitable.
I wondered if 385 brass would do. It is copper 58% lead 3.5% and zinc 38%. It is listed as free machining which I assume also means it is easy on the shaft.
Apart from that I can get phosphor bronze PB1 or 2, or toughmet 3 CX105. Any recommendations please
David
I have been unable to find the composition of LB10
The only leaded bronze that I can get is LG2 gunmetal which is Copper 85%, tin 5%, zinc 5% and lead 5%. It is listed as suitable for light loads at low to medium speeds so I am not sure if it is suitable.
I wondered if 385 brass would do. It is copper 58% lead 3.5% and zinc 38%. It is listed as free machining which I assume also means it is easy on the shaft.
Apart from that I can get phosphor bronze PB1 or 2, or toughmet 3 CX105. Any recommendations please
David
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- May 7, 2005
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LB10 has 10% lead and is a Glacier bush material.
Closest I could find is
C93200 Bearing Bronze, High Leaded Tin Bronze SAE 660 Cu 83%, Sn 7%, Pb 7%, Zn 3% The workhorse. Good balance of strength, wear resistance, machinability, and anti-friction properties. Good conformability & embeddability due to lead. Moderate corrosion resistance.
Closest I could find is
C93200 Bearing Bronze, High Leaded Tin Bronze SAE 660 Cu 83%, Sn 7%, Pb 7%, Zn 3% The workhorse. Good balance of strength, wear resistance, machinability, and anti-friction properties. Good conformability & embeddability due to lead. Moderate corrosion resistance.
concours
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- Dec 29, 2011
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The bushes didn't wear the shaft, dirty oil did.
Thanks again for the replies. It looks like I can get some C93200.
The bike is fitted with the original centrifugal oil cleaner as well as a separate paper cartridge oil filter, and has regular oil changes, never exceeding 2000 miles apart, using HD50 Penrite oil. The bike also did some track work and received much more frequent oil changes during that time.
The bearing shafts are not hard and can be filed. The cam lobes are stellite. I fitted aftermarket cam bushes, of unknown composition, about 30,000 miles ago. Having measured both the shaft and bushes, the bushes have not worn at all, and are still at specified size, but the shafts have worn.
David
The bike is fitted with the original centrifugal oil cleaner as well as a separate paper cartridge oil filter, and has regular oil changes, never exceeding 2000 miles apart, using HD50 Penrite oil. The bike also did some track work and received much more frequent oil changes during that time.
The bearing shafts are not hard and can be filed. The cam lobes are stellite. I fitted aftermarket cam bushes, of unknown composition, about 30,000 miles ago. Having measured both the shaft and bushes, the bushes have not worn at all, and are still at specified size, but the shafts have worn.
David
- Joined
- May 7, 2005
- Messages
- 7,777
The bushes not wearing but the shafts wearing shows the dirt in the oil exceeded the embeddabilty of the bush material. Embeddibility is the bearing materials ability to absorb dirt into the surface before the dirt then becomes part of the surface and the bearing becomes like sandpaper. The dirt could be carbon from combustion and easily passes through filters. Lead has excellent embeddability.
