Motorcyle Racing Engines (antique)

General engine tech -- Drag Racing to Circle Track

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Keith Morganstein
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Re: Motorcyle Racing Engines (antique)

Postby Keith Morganstein » Sun Aug 13, 2017 8:28 am

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Interesting patent drawing for a Harley four valve racer. The valve angle would suggest a hemi type chanber. The lifters look like a roller with lever or finger. Cams have a lot of high lift duration. I've found no evidence of lower cylinder porting on these. It seems in this design, they were more aware of airflow and scavenging.
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Re: Motorcyle Racing Engines (antique)

Postby Keith Morganstein » Sun Aug 13, 2017 8:48 am

Good look at Indian ported cylinders in this link.
https://www.yesterdays.nl/product/india ... ?pdf=24425
I can't imagine that the piston ring travel is below those ports? However you see flames from them in operation (in the night video link in my first post)

It looks as cylinder ports are at different heights on the lower cylinders on different engines? Different aspect in each photo tho
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Re: Motorcyle Racing Engines (antique)

Postby Keith Morganstein » Sun Aug 13, 2017 9:20 am

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Re: Motorcyle Racing Engines (antique)

Postby Keith Morganstein » Sun Aug 13, 2017 9:20 am

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Re: Motorcyle Racing Engines (antique)

Postby Keith Morganstein » Sun Aug 13, 2017 9:21 am

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Re: Motorcyle Racing Engines (antique)

Postby panic » Sun Aug 13, 2017 9:48 am

60 years of 2-stroke development tells u that a ring stack can safely pass across a port much wider than you would suspect, but Kawasaki "H" experience tells us that a narrow bridge overheats and bows into the cylinder and breaks the ring.

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Re: Motorcyle Racing Engines (antique)

Postby Keith Morganstein » Sun Aug 13, 2017 3:54 pm

panic wrote:60 years of 2-stroke development tells u that a ring stack can safely pass across a port much wider than you would suspect, but Kawasaki "H" experience tells us that a narrow bridge overheats and bows into the cylinder and breaks the ring.

No problem with rings passing by ports. The two stroke diesels have many large ports and not an issue. Interesting on the kawis, I wasn't breaking rings, just scuffing/ seizing the middle piston.

It's the combustion exiting the ports on these antiques that intrigues me. I wonder if combustion is passing by the rings, because it doesn't look as if the piston can go low enough in the cylinder at BDC to expose the top of the piston.

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Re: Motorcyle Racing Engines (antique)

Postby Erland Cox » Sun Aug 13, 2017 5:53 pm

this is the best book that I have seen about old racing bikes: https://www.amazon.co.uk/Racing-Motor-C ... 0600363422


Erland

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Re: Motorcyle Racing Engines (antique)

Postby Keith Morganstein » Mon Aug 14, 2017 8:11 pm

Erland Cox wrote:this is the best book that I have seen about old racing bikes: https://www.amazon.co.uk/Racing-Motor-C ... 0600363422


Erland


Thanks, book ordered

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Re: Motorcyle Racing Engines (antique)

Postby Keith Morganstein » Mon Aug 14, 2017 8:18 pm

In researching these motorcycles, I find the "Cyclone" it was an OHC v-twin with bevel cam drive, hemi chamber heads, roller bearing lower end, it made a remarkable 45 HP from 61 cu/in, (for way back in 1915) and it had a 115+ top speed.
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Re: Motorcyle Racing Engines (antique)

Postby Keith Morganstein » Mon Aug 14, 2017 8:20 pm

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Re: Motorcyle Racing Engines (antique)

Postby 1989TransAm » Mon Aug 14, 2017 10:24 pm

Keith Morganstein wrote:In researching these motorcycles, I find the "Cyclone" it was an OHC v-twin with bevel cam drive, hemi chamber heads, roller bearing lower end, it made a remarkable 45 HP from 61 cu/in, (for way back in 1915) and it had a 115+ top speed.
image.jpg


That is good hp/ci for the day.

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Re: Motorcyle Racing Engines (antique)

Postby jsachs1 » Wed Aug 16, 2017 4:14 pm

Get hold of Billy Lane @ Choppers, Inc.
He's in Daytona Bch. Beville Rd.. Seems the board track bikes has taken over his business.
John


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