Probably true Fastcat, probably true. Perhaps I just wanted to hear 200 HP 1000cc RZ's racing down the strip.
In any event, here is more propaganda...
The original site above was missing some text and referred to a figure that was absent, which makes me believe they "cut and pasted" incomplete portions. This is the same company, but not corporate, and off one of their weedwacker sites. (
http://www.t2500.com/c4tech/index.html) Here is the text and EPA crap pasted from the t2500 site.
(Begin quotes without the fancy box)To cleanly transfer the fuel mixture into the Power Boost Chamber, C4 Technology® utilizes two reed valves, one located on the intake side, just behind the carburetor, and another reed valve between the crankcase and Power Boost Chamber. Thereby, on each upstroke of the piston, the air/fuel mixture is drawn into the crankcase through the intake reed valve. On each downward stroke of the piston, the air/fuel mixture is discharged through the second reed valve and into the Power Boost Chamber. Then, with the next downward stroke, the air/fuel mixture is introduced into the combustion chamber as the intake reed valve opens. The miniature overhead valves for the intake and exhaust, work off a valve train timing gear, which turns at half the speed of the crankshaft and controls the valve timing.
A critical step in this process occurs just before the air/fuel mixture enters the combustion chamber; the Power Boost Chamber plays an important role in inducing a positive pressure charge to the mixture. This patented system simplifies the mechanical process and provides several advantages: Effective lubrication of critical engine parts, pressurization of the combined air/fuel/oil charge for added power and performance, and supplements all day, all position capabilities
The EPA has finalized the timetable for its phased-in emission regulations for hand-held outdoor power equipment. The current Phase 1 levels for allowable emissions is 184 g/bhp-hr, as initiated by the EPA in 1997(1), and is calculated from measuring two primary benchmark pollutants, hydrocarbons (HC) and Nitrates of Oxide (NOx). It is no surprise that Shindaiwa has met these standards through leaner carburetor settings, and changes to cylinder porting.
Starting January 1, 2002, the Phase 2 emission regulations will require all manufactures to lower the HC and NOx levels to 146 g/bhp-hr (see figure I). Shindaiwa will confidently meet this new regulation with a mix of current EPA Phase 1 and Phase 2 technologies, which use low emission catalyst mufflers(2). However, starting in 2005, the allowable emission levels for HC and NOx are cut to a scant 37 g/bhp-hr. That is almost 80% lower compared to today's 2001 levels; and not attainable by today's 2-cycle technology.
EPA Phase 2 Regulations Engine Class | Pollutant | 2002 | 2003 | 2004 | 2005 & Later |
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| Class IV (20-50cc) | HC = NOx (g/bhp-hr) | 148 | 110 | 73 | 37 |
[SIZE=-2]Figure I. - - Source: EPA, October 2001 [/SIZE] Take a minute now and read the chart on emerging emission levels (see figure II). Okay, from the chart below which of the engine technologies will meet and beat the tough 2005 EPA emissions standards of 37 g/bhp-hr? That is correct, the 4-cycle engine at just 11 to 23 g/bhp-hr. The 4-stroke engine is the only viable power source currently that will attain the EPA 2005 levels for compliance. Our C4 Technology® measures an impressive 18 g/bhp-hr. However, Shindaiwa engineers will continue to work diligently to further lower emissions, while simultaneously powering-up performance.
Emerging Emission Levels
HC+NOx (g/bhp-hr) ranges 2-Stroke
| OC (oxidation catalyst) | 44-53
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| Compression wave | 46
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| TWC (three way catalyst) | 42-44
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| High efficiency recirculator | 41
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| Stratified charge | 39-50 |
Figure II.Source:
EPA, October 2001
(1) Based on the 20-50cc Class IV engine family.
(2) With EPA Phase 2 Corporate Averaging, Shindaiwa plans to have a full commercial product line with a mix of EPA Phase 1 and Phase 2 technologies, and complemented with our new C4 Technology® program. (end of quoted text and tables and other stuff that I felt necessary to stuff into this post)
