Grinding a phoenix crank

[David Cochrane]

You are strongly advised to return the crank to Phoenix to be reground.

[Charles P]

You are strongly advised to return the crank to Phoenix to be reground.

Any logical reason why?

[Barker]

Because Phoenix are most likely to do a proper job, re-nitrating the big end journals plus come up with the proper resized shell bearings for the connecting rods. You will need to check with them that the shells on the connecting rods have been resized with the reground crank. I have had this work done by them.

[Charles P]

Because Phoenix are most likely to do a proper job, re-nitrating the big end journals plus come up with the proper resized shell bearings for the connecting rods. You will need to check with them that the shells on the connecting rods have been resized with the reground crank. I have had this work done by them.

Phoenix are a decent outfit but a competent machine shop can grind a crank, resize rods and as has been said, a 10 thou grind won't go through the nitriding.
Yes, if you want to go further than 10 thou then the risk of going through the casing warrants their attention. 


Charles

[Zetomagneto]

Phoenix are doing me a billet crank at the moment, IIRC Marc said that the nitriding on it would be 0.020" deep

Are they doing you a special? Normally their A 7 cranks are from forging, not billet

Yes,  it is a special. Current Phoenix A7 cranks are from forgings as you say; Some earlier A7 Phoenix cranks were investment cast and then HIP treated. I have a 1 1/2" version of those here.

My understanding of a billet crank is that it is machined from a solid billet.

If I understand your reply correctly yours is from a casting , in which case it cannot be a billet crank.
A forged crank is better than a cast one, interested to know why you would be using a casting.

[Stuart Giles]

Phoenix are doing me a billet crank at the moment, IIRC Marc said that the nitriding on it would be 0.020" deep

Are they doing you a special? Normally their A 7 cranks are from forging, not billet

Yes,  it is a special. Current Phoenix A7 cranks are from forgings as you say; Some earlier A7 Phoenix cranks were investment cast and then HIP treated. I have a 1 1/2" version of those here.

My understanding of a billet crank is that it is machined from a solid billet.

If I understand your reply correctly yours is from a casting , in which case it cannot be a billet crank.
A forged crank is better than a cast one, interested to know why you would be using a casting.

Just to clarify, I have an early run-of-the-mill Phoenix 1 1/2" crank here -these were investment cast, and then HIP treated. Phoenix later went over to forging for these cranks. I am also having a one off "special" crank made by Phoenix at the moment, they're making it from EN40 billet which will then be nitrided.

[Zetomagneto]

Phoenix are doing me a billet crank at the moment, IIRC Marc said that the nitriding on it would be 0.020" deep

Are they doing you a special? Normally their A 7 cranks are from forging, not billet

Yes,  it is a special. Current Phoenix A7 cranks are from forgings as you say; Some earlier A7 Phoenix cranks were investment cast and then HIP treated. I have a 1 1/2" version of those here.

My understanding of a billet crank is that it is machined from a solid billet.

If I understand your reply correctly yours is from a casting , in which case it cannot be a billet crank.
A forged crank is better than a cast one, interested to know why you would be using a casting.

Just to clarify, I have an early run-of-the-mill Phoenix 1 1/2" crank here -these were investment cast, and then HIP treated. Phoenix later went over to forging for these cranks. I  am also having a one off "special" crank made by Phoenix at the moment, they're making it from EN40 billet which will then be nitrided.

Stuart that sounds very nice, can we see a picture when finished

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Phoenix are doing me a billet crank at the moment, IIRC Marc said that the nitriding on it would be 0.020" deep

Are they doing you a special? Normally their A 7 cranks are from forging, not billet

Yes,  it is a special. Current Phoenix A7 cranks are from forgings as you say; Some earlier A7 Phoenix cranks were investment cast and then HIP treated. I have a 1 1/2" version of those here.

My understanding of a billet crank is that it is machined from a solid billet.

If I understand your reply correctly yours is from a casting , in which case it cannot be a billet crank.
A forged crank is better than a cast one, interested to know why you would be using a casting.

Just to clarify, I have an early run-of-the-mill Phoenix 1 1/2" crank here -these were investment cast, and then HIP treated. Phoenix later went over to forging for these cranks. I  am also having a one off "special" crank made by Phoenix at the moment, they're making it from EN40 billet which will then be nitrided.

Stuart that sounds very nice, can we see a picture when finished