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Author Topic: When would the Japs catch up with 2T, if ever?  (Read 889 times)

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Offline BuRP

Re: When would the Japs catch up with 2T, if ever?
« Reply #40 on: April 18, 2020, 04:34:36 pm »
Diesel type 2 strokes with short skirt pistons won't work.

Better tell that to Wartsila, they do use short sleeved pistons in all their engines!
Using Crosshead conrods there's no sideways force on the piston first of all, and the use of valves means there's no ports in the cylinder - hence the tiniest piston-height will do fine, just ringlands basically!
Piston controlled stroker-diesels are largely gone today, they're too small to compete with the higher efficiencies of the larger motors, 4strokes mostly.
Sparta MC50, 46 other 50cc's, Garelli Tiger Cross, Jawa 250, Kreidler RS (plated), Kawasaki S1 250/3, S2 350/3, H1 500/3, H2 750/3, Suzuki GT380/3 - 10 year gap - KDX200, BMW 1150GS Adventure, Honda CBR600RR, Honda XR650R 2007 & 2003, Honda CRF230, Yamaha BWS100, BMW F800GS Adventure, Husqvarna 701 Enduro 2018, KTM 790 Adv R 2019, KTM 2020 XC-W TPI 300 Six Days, KTM 2014 500 EXC-W Six Days, KTM 790 Adv R Rally 2020
 

Offline Welsh

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Re: When would the Japs catch up with 2T, if ever?
« Reply #41 on: April 18, 2020, 04:50:46 pm »
Diesel type 2 strokes with short skirt pistons won't work.

Better tell that to Wartsila, they do use short sleeved pistons in all their engines!
Using Crosshead conrods there's no sideways force on the piston first of all, and the use of valves means there's no ports in the cylinder - hence the tiniest piston-height will do fine, just ringlands basically!
Piston controlled stroker-diesels are largely gone today, they're too small to compete with the higher efficiencies of the larger motors, 4strokes mostly.

Sasolburg have a bunch of those Wartsila's from memory.  :sip:
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Offline 2StrokeDan

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Re: When would the Japs catch up with 2T, if ever?
« Reply #42 on: April 18, 2020, 05:04:32 pm »
Katana's Avatar is the cause this thread is now at ship's engines. :pot:
 

Offline Sabre

Re: When would the Japs catch up with 2T, if ever?
« Reply #43 on: April 18, 2020, 09:08:23 pm »
Do you have any idea of the size and weight of a ship engine piston?

Yes - I've stood and sat on them whilst fixing their cracks.... with this stuff, watch the video clip:
https://www.metalockengineering.com/en/typical-repairs/metal-stitching/
Cast iron pistons yes, hence my remark of being a bit too heavy for a bike  :lol8:
I have last heard of this technique in the 80's, glad to see it is alive and well and running  :thumleft:
"Riding a motorcycle is technology's closest equivalent to being a cowboy. Our modern horse has two wheels instead of four, but it's nervous system is appropriately rated in horsepower" Robert Edison Fulton jr. From his book "One Man Caravan"

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