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02-17-2015, 10:25 PM | #21 |
Gone Wild
Join Date: Apr 2014
Location: Flint, MI, USA
Posts: 656
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Re: Who has a stock 2pg piston laying around?
I'm sure it will turn tighter, but based on design, it'll peak near there, rev farther though.
Yamaha MX bikes of the era, with tuned pipes and 36-38mm carbs, peaked between 6500-7500. |
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02-17-2015, 10:28 PM | #22 |
Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: Who has a stock 2pg piston laying around?
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02-17-2015, 10:40 PM | #23 |
Gone Wild
Join Date: Apr 2014
Location: Flint, MI, USA
Posts: 656
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Re: Who has a stock 2pg piston laying around?
I memorized most of The Handbook in Jr High
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02-17-2015, 10:47 PM | #24 |
Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: Who has a stock 2pg piston laying around?
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02-17-2015, 11:11 PM | #25 |
Gone Wild
Join Date: Apr 2014
Location: Flint, MI, USA
Posts: 656
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Re: Who has a stock 2pg piston laying around?
I can tell you that it borders on irrelevant in a fairly low-rev heavy recreational vehicle, but if a person wanted to take advantage of the 4.4mm shorter stroke compared to the bikes, that they could.
And, there's a nice picture on pg120, of the poorly-placed 2pg boost port. http://www.amrca.com/tech/tuners.pdf And, that there have been substantial changes/improvements in 2 stroke development in the 42 years since his much-quoted book, or these dinosaurs we're chatting about. Bell's book is a nice one as well. |
02-17-2015, 11:25 PM | #26 |
Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: Who has a stock 2pg piston laying around?
"Mean piston speed" is not irrelevant to anyone wanting to make power in a reciprocating engine, especially a 2-stroke. The higher the "mean piston speed", the more performance can be obtained from the motor.
You have done just the opposite by boring the motor out. That lowers the MPS, if you take the corrected values into account. |
02-17-2015, 11:50 PM | #27 |
Gone Wild
Join Date: Apr 2014
Location: Flint, MI, USA
Posts: 656
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Re: Who has a stock 2pg piston laying around?
Disclaimer: No one should be stupid enough to think they can ever approach the HP numbers on a modern MX bike, with their industrial-based drone engine, mmmm-K.
Area under the curve, not just the maximum the engine is capable of, is the goal of this project. MPS is in the 'safe with forged piston' to over 12k, WAY beyond the envelope. Modern 250 2 stroke single MX bikes are crowding 200hp/liter, and still in the 8500 rev range, and make eleventeen times as much power as a cart-lump. The cylinder is old-tech, and decent power could be made up top at the expense of the rest of the curve. Look at mod RD350, H2, etc, and see what I mean. |
02-17-2015, 11:54 PM | #28 |
Gone Wild
Join Date: Apr 2014
Location: Flint, MI, USA
Posts: 656
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Re: Who has a stock 2pg piston laying around?
Or, take the same engine, 250 Polaris ATV, cousin to the EZGO, and extrapolate progressive variations in tuning package.
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02-17-2015, 11:56 PM | #29 |
Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: Who has a stock 2pg piston laying around?
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02-17-2015, 11:58 PM | #30 |
Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: Who has a stock 2pg piston laying around?
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