Another chainsaw dyno...

[chipper1]

Speaking about beer
Here's a beer themed cake my wife made for me on my bday [emoji13]

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You made the cookie and she makes the cake lol.

 

[NightRogue]

Sorry for the derail folks
Here's a dyno/data from a big rig(oil barge) that my BIL is working in atm
That ship is powered by 2 stroke diesel(uni flow scavenging)

Puts out 1,090 kNM/7,147kw @ 62.6 rpm
Consumes 1,368kg/h fuel

Just spoke to him just now and he told me my explanation of the bob weight determining the torque output is correct for 2 stroke. Cool stuff

 

[jk14]

Sorry for the derail folks
Here's a dyno/data from a big rig(oil barge) that my BIL is working in atm
That ship is powered by 2 stroke diesel(uni flow scavenging)

Puts out 1,090 kNM/7,147kw @ 62.6 rpm
Consumes 1,368kg/h fuel

Just spoke to him just now and he told me my explanation of the bob weight determining the torque output is correct for 2 stroke. Cool stuff

WOW!!! That's impressive. Did a quick conversion and that's roughly

803'000 ft. lbs. and 9600 hp. @63 rpm.

 

[chipper1]

WOW!!! That's impressive. Did a quick conversion and that's roughly

803'000 ft. lbs. and 9600 hp. @63 rpm.

Imagine the chain you could pull with that .

 

[Fifelaker]

The Ranger series is solid, but something in New Belgium's process gives me a strange feeling the next day.

Your "Check liver light" was on too long and drained your battery.

 

[N8TE]

View attachment 258070


choices

 

[NightRogue]

WOW!!! That's impressive. Did a quick conversion and that's roughly

803'000 ft. lbs. and 9600 hp. @63 rpm.

It's crazy, i told him jokingly to pull a wheelie on that rig. He said it literally is on wheelie mode when they're not carrying anything lol

They'll be going to brazil to pick crude oil and supposed to send em to somewhere in texas or nearby, he said you can see the whole motor flexing when its fully loaded

They dont run with conventional cam and all, everything is hydraulic driven and the timings are changing real time according to all the factors heat/humidity and all

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[NightRogue]

Imagine the chain you could pull with that .

Lol if its pulling a chain i hope they dont touch the ground with it, otherwise planet earth will be splitted into 2

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[NightRogue]

WOW!!! That's impressive. Did a quick conversion and that's roughly

803'000 ft. lbs. and 9600 hp. @63 rpm.

I wonder what happens when it hits 5252 rpm when the hp and torque line crosses over like we get in the dyno, few of those ships sailing together can probably slow the planet down by couple milliseconds at least

 

[Bigmac]

I wonder what happens when it hits 5252 rpm when the hp and torque line crosses over like we get in the dyno, few of those ships sailing together can probably slow the planet down by couple milliseconds at least

The interesting thing with those motors is piston speed, even though the rpm is low, they have a lot of piston speed, if it was to hit 100 rpm it would exceed f1 piston speed!

 

[qurotro]

The interesting thing with those motors is piston speed, even though the rpm is low, they have a lot of piston speed, if it was to hit 100 rpm it would exceed f1 piston speed!

I think the rod would hit an alien on the other planet first..

 

[Bigmac]

I think the rod would hit an alien on the other planet first..

Agreed...It would fly apart before that would happen 63 rpm is redline!

 

[NightRogue]

I think the rod would hit an alien on the other planet first..

Lol im dead, yeah i know its not possible. But was just imagining what would happen if it could

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[Sawrain]

Just spoke to him just now and he told me my explanation of the bob weight determining the torque output is correct for 2 stroke. Cool stuff

Can you expand on this?

Many of the large marine two strokes don’t have crankshaft counterweights.

 

[NightRogue]

Can you expand on this?

Many of the large marine two strokes don’t have crankshaft counterweights.

I havent seen those, but he calls it a web. Not sure how it looks, I'll ask him to get us a picture. Will be interesting topic

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[Sawrain]

I havent seen those, but he calls it a web. Not sure how it looks, I'll ask him to get us a picture. Will be interesting topic

That’s what I call it also, the cranks are made up of a number of two different forgings, a “semi built” crankshaft, basically they are made of multiples of the same two parts, crank web and pin as one piece, and main crankpin as the other, they just add more to make the appropriate cylinder count, 4 through 14 cylinders.

The crank webs machine bored main journal holes are interference fit over the main crankpins with no positive locking mechanism to avoid stress raisers.

Here is photo from online of a marine slow speed two stroke crank.

Note no bob/counterweights, and the toothed gearwheel at the far end of the picture, that is the flywheel, relativity speaking they are tiny.

Same online photo source showing flywheel, again relatively small compared to smaller engines, it's main purposes is simply being a gearwheel to allow turning of the engine for maintenance and checking for unwanted fluid ingress into the cylinders before starting, it does not play much part storing energy or stabilising rpm, not used for starting either, that is achieved by timed 'start air' direct into the cylinders.

Link to photo source http://www.marinediesels.info/2_stroke_engine_parts/Other_info/semi_built_crankshaft.htm


I spent four years operating, maintaining and fault finding Man B&W 6S70-MC engines, around 23000HP @ 91rpm, 700mm piston, 2680mm stroke, don't have many photo's at hand, but here are some of prepping a spare piston before a change out.


Lowering into maintenance position.






Prepping for new piston crown.



New crown and ring pack fitted, yours truly in place for scale.



If something isn't adding up, these are a crosshead engine.

 

[Stihl Potlicker]

you dyno a bark boxed saw?

 

[SpaceBus]

That’s what I call it also, the cranks are made up of a number of two different forgings, a “semi built” crankshaft, basically they are made of multiples of the same two parts, crank web and pin as one piece, and main crankpin as the other, they just add more to make the appropriate cylinder count, 4 through 14 cylinders.

The crank webs machine bored main journal holes are interference fit over the main crankpins with no positive locking mechanism to avoid stress raisers.

Here is photo from online of a marine slow speed two stroke crank.

Note no bob/counterweights, and the toothed gearwheel at the far end of the picture, that is the flywheel, relativity speaking they are tiny.

Same online photo source showing flywheel, again relatively small compared to smaller engines, it's main purposes is simply being a gearwheel to allow turning of the engine for maintenance and checking for unwanted fluid ingress into the cylinders before starting, it does not play much part storing energy or stabilising rpm, not used for starting either, that is achieved by timed 'start air' direct into the cylinders.

Link to photo source http://www.marinediesels.info/2_stroke_engine_parts/Other_info/semi_built_crankshaft.htm


I spent four years operating, maintaining and fault finding Man B&W 6S70-MC engines, around 23000HP @ 91rpm, 700mm piston, 2680mm stroke, don't have many photo's at hand, but here are some of prepping a spare piston before a change out.


Lowering into maintenance position.

View attachment 259496

View attachment 259501


Prepping for new piston crown.
View attachment 259489


New crown and ring pack fitted, yours truly in place for scale.

View attachment 259479

If something isn't adding up, these are a crosshead engine.

Awesome pics and graphics! That's the most undersquare engine I've ever seen.

 

[Nutball]

I didn't see a ported 572 graph in the graph only thread, is there a graph for one?

 

[gurwald]

you dyno a bark boxed saw?

Dont do it.