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June 2nd, 2015, 03:06 AM   #191
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Great initiative! I'm assuming that stroke is fixed for the 10-set run, and therefore the case selection as well? (And which cases then if so? 644?)
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June 2nd, 2015, 03:44 AM   #192
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I had best get myself an earlier berg quick smart. You are a legend mad scientist crack head like this other mad bastard I know in the Southern Hemisphere. I'm not worthy
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June 2nd, 2015, 03:47 AM   #193
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Tourist you need an offset ground pin on this crank and make a Franken-motor ha ha
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June 2nd, 2015, 10:55 AM   #194
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I talked to the machinist today. He thought that crank with pin would sum up to 6-7000 SEK if doing a series of 10 pieces. Thats about 660, 720 USD or 925 AUD, excluding the bearing cage. I'll have to check the pricing for that, when I've done the design. The main cost benefit with larger series seems to come from the hardening process. It was quite possible to do two different strokes. I'm assuming we are talking a 35mm pin for both 80mm and 70mm stroke?

@Bushie: I can try to make the crank as light as possible, but, I need to know how big "unbalance" we want the crank with pin assembly to be? Preferably expressed as "gram x mm". More practically expressed: how much weight on the crank pin (bearing+rod+weight) will balance the crank? Weight x 40 mm = X [gmm]. Same thing with the 70mm crank. Would it help with holes in the webs to put weight insert in, to be able to adjust the balance factor as needed?
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June 2nd, 2015, 12:07 PM   #195
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35mm pin for 70mm stroke yes. (I assume this means a custom rod. Which would be warranted for the task.)

(Thought: Maybe a 570 rod could be used? 72mm stroke. Doubtful that it would work with the cases, right?)

When would commitment be required?

Last edited by tourist; June 2nd, 2015 at 12:21 PM.
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June 2nd, 2015, 01:52 PM   #196
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I probably need a new crank in the fall, if you can get them for reasonable price I would be interested in one.
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June 2nd, 2015, 03:31 PM   #197
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Originally Posted by Dr_C View Post
I talked to the machinist today. He thought that crank with pin would sum up to 6-7000 SEK if doing a series of 10 pieces. Thats about 660, 720 USD or 925 AUD,

@Bushie: I can try to make the crank as light as possible, but, I need to know how big "unbalance" we want the crank with pin assembly to be? Preferably expressed as "gram x mm". More practically expressed: how much weight on the crank pin (bearing+rod+weight) will balance the crank? Weight x 40 mm = X [gmm]. Same thing with the 70mm crank. Would it help with holes in the webs to put weight insert in, to be able to adjust the balance factor as needed?
OK Dr_C ill check after work today if i have all the data to calculate the imbalance as a torque value ...

it gets tricky to replicate a traditional "balance factor" in this method though because we all have different rods and pistons. I at best I can express the "ideal" balancing moment as a torque value for the crank assemblies that I have measured up traditionally.

hmm damit! now my tight arsed logic says at $950 without a rod or bearing i think i would be very tempted to buy 2 oem cranks.
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June 2nd, 2015, 08:11 PM   #198
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Originally Posted by bushmechanic View Post
OK Dr_C ill check after work today if i have all the data to calculate the imbalance as a torque value ...

it gets tricky to replicate a traditional "balance factor" in this method though because we all have different rods and pistons. I at best I can express the "ideal" balancing moment as a torque value for the crank assemblies that I have measured up traditionally.

hmm damit! now my tight arsed logic says at $950 without a rod or bearing i think i would be very tempted to buy 2 oem cranks.
Thanks, Bushie!
I suppose that tight arse of yours loves replacing mains on a regular basis and gets all cranked up (!) if a breakdown punches a hole in your cases? Making custom parts comes with a price tag. If anyone out there has a more price worthy solution on the manufacturing of webs and pin (requires knowledge about crank design and function), please let me know!
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June 3rd, 2015, 12:36 AM   #199
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My thoughts on a custom design would be to make "one" and see if it worked.

I did post a drawing of a cost effective way of producing a flywheel and main pin,
will it work? I am not sure but that would be how I would go about it, as an experiment.
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June 3rd, 2015, 03:46 AM   #200
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Originally Posted by spanner View Post
My thoughts on a custom design would be to make "one" and see if it worked.

I did post a drawing of a cost effective way of producing a flywheel and main pin,
will it work? I am not sure but that would be how I would go about it, as an experiment.
If I produce a crank and fit it in my RST engine, we will not have test results until next August... And furthermore, what will the test result from that operation tell us? If the mains last for more than 20h in my engine, what does that correspond to in a "normal" operation?

I think I mentioned that my machinist have access to raw crank forgings. That means the crank web will be solid and require a minimum of machining.
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