Making G80CS flywheels

[Braaap]

Hi.
My new purchase has turned out to be the same as the other 5 AMC bikes i've owned... the engine is stuffed.
All replacement crank pins and bearings have been bought new.
Just the flywheels to make....

Has anyone here been down this road?

I am a senior Fitter/turner. Well capable of a good result... just looking for recomendations re. material and fits.

I'm thinking mild steel?

[Braaap]

I have spent the day measuring a good chaps spare short stroke flywheels.

Sizes and material question answered.

Which is good... because it seems that BUGGER ALL help comes out of this forum!

[Groily]

You must be a glutton for punishment, as you keep coming back to the marques despite everything always being 'stuffed'.

Much depends on from which part of the Cosmic Motorcycle Galaxy machines are sourced I suppose - there are actually a lot of good ones. Two of my three came to me in good shape from known sources, t'other was known to be a dog and was priced accordingly.

The forum is actually rather full of advice on all sorts of things - but I don't expect anyone who happened to know the answer to your query has been online since you posted, all of what, half a day ago. I'm afraid I don't know what the grade of steel is, nor do I have the data. There are probably folk here who do, if you haven't put them off feeling inclined to share what they know - and there are specialist repairers who advertise in the Jampot who probably know too.

[Braaap]

I have posted half a dozen times. The silence has mostly been deafening.
In my other life i ride a Ducati. Online help is abundant and forthcoming. Friendly chat is offered by riders without the specific answer.
Perhaps the difference is "Facebook"?
As a new member here i have been disappointed.
If this is the spiritual home of AMC worldwide.... we are in trouble as a marque.

Just telling it how i see it.

[vincentvv]

Oeh, an angry kiwi (-; If I can't give you a good answer on your question I rather respond nothing. I could give it a guess but would not help you any forward. Maybe this applies to the other forum members also? I have a good experience of getting info from the club members, give it another chance?

[Braaap]

Angry Kiwi?

No. Just noticing a big difference in the vibe here versus Italian Owners Club and Ducati owners club.

There's either a lack of knowledge here... or an unwillingness to share it.

Many posts here get 100 views with no replies.

A post of mine re. a source for pistons got one answer. When i followed that lead... i was 3rd in line behind 2 other inquiries.
Am i dealing with helpers here. Or other competitors for a scarce resource?

WTF?

[Dixter]

. Sizes and material question answered.!

Kindly share your decision. What material have you selected?

Ciao,
Dick

[Braaap]

The Wolf flywheels are made from EN26.

I have been loaned a set of original short stroke wheels which i will get spectro analysed.

The wheels in my failed crank appear to be mild steel.

[Triumph-Legend]

Oeh, an angry kiwi (-; If I can't give you a good answer on your question I rather respond nothing. I could give it a guess but would not help you any forward. Maybe this applies to the other forum members also? I have a good experience of getting info from the club members, give it another chance?

(I have spent the day measuring a good chaps spare short stroke flywheels). Blimey all day measuring flywheels. must be really complicated lump of metal.
If you know the size of the shafts, you will easily be able to determine the size of the holes in the flywheels.

Sizes and material question answered. Are the shaft to flywheel fit an interference fit as defined in most engineering reference books? If you know the size of the shafts, you will easily be able to determine the size of the holes in the flywheels.
Also did you check the surface finish of the internal boring as this will have a significant effect on the fit of mating parts. Surface finish as you a probably aware is determined as the roughness average of the surface. (RA).

Regarding material. The choice is largely whatever type of steel that you chose. Mild steel may well be fine, Maybe the original parts were cast, sorry but I have not checked to determine the original spec when my various engines were in bits. I'm pretty sure that there is one company producing replacement flywheels in Stainless Steel. Can't see any advantage here but I bet the look very pretty polished and possibly won't corrode as easily as a lump of EN24. The choice is for you to make. Nothing to hard to machine well but hard enough to give good support to the mating parts. As a senior turner / fitting I'm sure you will make a good choice.

Check the balance factor you require and if possible dynamically balance the assembled crank assembly. Note 350 and 500 motors use difference balance factor.

To be fair to the majority of club members. Most are probably not engineers by trade so the lack of response to your enquiry is hardly surprising. As a time served senior Fitter/turner you would certainly have a great deal more experience of materials, fits and tolerances than the majority of club members.

Post a picture of the crank assembly when finished. You may find that there are others that would like a custom crank assembly.

[Braaap]

Thanks for that.
All day was needed because i had to traverse the width of th country to get to the flywheels.
The interference fits are much greater on the factory wheels than the Wolf wheels. Both have excellent surface finishes in the bores.
The plan is to have the wheels water-jet cut from billet with the balancing holes finished.

The components will be weighed before assembly and dynamically balanced. My G3L was done. She flies!

Give me a month, i'll have a result.