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Latest updates on progress of the C70 commuter
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<blockquote data-quote="69ST" data-source="post: 174442" data-attributes="member: 5"><p><em>"2.5 - 5.9%"</em> contradicts<em> "4-6% minimum</em>". Sitting behind a desk, a couple thousand miles away, this is clear as mud...so far. I'm not being argumentative, far from it. What's needed is clear, detailed & accurate data; otherwise, it's blind guesses, with a good chance of being dead wrong...at best. 11% is going to be a challenge for stock displacement but, I'd expect 20-25mph and the engine at, or near, its power peak. </p><p></p><p>Seriously, I just came back from riding in an area where there are a few extended 10% grades, along with several steeper, but much shorter, ones. 8-10% over a 3-mile span was enough to slow a 60-65mph bike into the low 50s, with a modest headwind. There were a couple of shorter but steeper grades which, combined with a stiff headwind, slowed proceedings into the mid-to-high 40s. Over an estimated 30% grade, I had no trouble pulling 30mph (didn't even try going any faster, the speed limit was 15mph, as it was)...we're talking 50-80% of top speed, minimum. Now, this is with a bone-stock, long-stroke 110cc Honda motor and, the higher speeds involve substantially more aerodynamic drag. The main point is the percentages...from an engineering standpoint. The other issue is what one can reasonably expect from an "unstressed" engine and why you're not seeing that, as things are.</p><p></p><p>Cutting to the chase, I rode ~400 miles over three days; 330 of that was covered in two of them. Between the hills and stiff headwinds, I'd estimate at least 30% of that was at-or-near WOT. Oil temp maxed-out at 102C, once...with a tankful of lame fuel. That, along with speeds that came up short of what I'd have preferred, is the absolute worst of it, period. The engine doesn't know the difference between running at 85-100% output over inclines, declines, level road or facing 20-35mph headwinds. Over the years, there have been a few members here with totally stock CT70s that were run wide-open for miles...at speeds that exceed your minimum requirements...with similar results. IOW, no obvious signs of weakness, mechanical stress or overheating/detonation. The money question is what combination of factors is holding you back. Even if 11% grade is overwhelming, the bike should be able to maintain speeds close to, or meeting, your reasonable minimum(s). Getting this sorted is going to take clear & accurate data, no way around it.</p></blockquote><p></p>
[QUOTE="69ST, post: 174442, member: 5"] [I]"2.5 - 5.9%"[/I] contradicts[I] "4-6% minimum[/I]". Sitting behind a desk, a couple thousand miles away, this is clear as mud...so far. I'm not being argumentative, far from it. What's needed is clear, detailed & accurate data; otherwise, it's blind guesses, with a good chance of being dead wrong...at best. 11% is going to be a challenge for stock displacement but, I'd expect 20-25mph and the engine at, or near, its power peak. Seriously, I just came back from riding in an area where there are a few extended 10% grades, along with several steeper, but much shorter, ones. 8-10% over a 3-mile span was enough to slow a 60-65mph bike into the low 50s, with a modest headwind. There were a couple of shorter but steeper grades which, combined with a stiff headwind, slowed proceedings into the mid-to-high 40s. Over an estimated 30% grade, I had no trouble pulling 30mph (didn't even try going any faster, the speed limit was 15mph, as it was)...we're talking 50-80% of top speed, minimum. Now, this is with a bone-stock, long-stroke 110cc Honda motor and, the higher speeds involve substantially more aerodynamic drag. The main point is the percentages...from an engineering standpoint. The other issue is what one can reasonably expect from an "unstressed" engine and why you're not seeing that, as things are. Cutting to the chase, I rode ~400 miles over three days; 330 of that was covered in two of them. Between the hills and stiff headwinds, I'd estimate at least 30% of that was at-or-near WOT. Oil temp maxed-out at 102C, once...with a tankful of lame fuel. That, along with speeds that came up short of what I'd have preferred, is the absolute worst of it, period. The engine doesn't know the difference between running at 85-100% output over inclines, declines, level road or facing 20-35mph headwinds. Over the years, there have been a few members here with totally stock CT70s that were run wide-open for miles...at speeds that exceed your minimum requirements...with similar results. IOW, no obvious signs of weakness, mechanical stress or overheating/detonation. The money question is what combination of factors is holding you back. Even if 11% grade is overwhelming, the bike should be able to maintain speeds close to, or meeting, your reasonable minimum(s). Getting this sorted is going to take clear & accurate data, no way around it. [/QUOTE]
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