SOHC.co.uk Forums > CB500/550
Cam chain tensioner
K2-K6:
--- Quote from: deltarider on August 07, 2024, 08:15:43 AM ---
--- Quote from: Bryanj on August 06, 2024, 08:18:46 PM ---No and No, blueing is probably single skinned aftermarket headers
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Thanks, Bryan. Exhausts are OEM. I never quite understood what causes blueing. A since long deceased racer once told me that when the headers blue, one way or the other, your firing is late. I'd like to learn more on this.
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Blueing, the ultimate temperature the exhaust material has reached (research "Kelvin scale" for detail) is affected by combustion temperature, obviously, but with many description not fully aware of what happens to do that.
The cam timing should essentially remain the same (as no adjustment is made to the critical distance in the chain pull run) which wouldn't give a shift in engine operation. If the camchain (very old) gets longer, then the intake valve would close later in crankshaft degree position, resulting in lower compression ratio dynamic effect. That would tend to cool combustion a little and be opposite of blueing. Toyota prius for example does this, using an Atkinson cycle engine config. By delaying the intake closed point, the piston coming back up the bore ejects some combustion gases back out the intake port, this lowers the effective compression ratio, gives cooler running, less internal resistance, and quiter combustion. Generally it won't rev fast though, so they use variable valve timing to facilitate "normal" running as revs climb. Kind of the opposite to Honda V-Tec arrangement, in which they operate at low speed in normal mild timing, then swap to wild camshaft timing at high rpm to give race type performance.
This affects the mechanical component of the combustion cycle, with ignition timing another aspect and overplayed onto anything happening here.
McCabe-Thiele (Ted):
I thought Blueing was simply the effects of heat cycles on the Chromed exhuast pipes, dependent on many factors such as ambient air temperature, exhaust gas temperature, exposure to chemicals in the air. Plus the actual design e.g. Single Skin.
It is the case that a lean mixture turns into hotter gases out of the silencer, a rich mixture results in a colder exhuast most noticeable at idle. I'm talking here about using the palm of your hand to measure the heat.
I would be guided by the colour of the spark plugs rather than attaching too much meaning to a blue manifold.
deltarider:
Thanks gents. Would any of you guys know which model Honda was the first with a self-adjusting camchain?
DomP:
--- Quote from: McCabe-Thiele (Ted) on August 07, 2024, 09:55:18 AM ---I thought Blueing was simply the effects of heat cycles on the Chromed exhuast pipes, dependent on many factors such as ambient air temperature, exhaust gas temperature, exposure to chemicals in the air. Plus the actual design e.g. Single Skin.
It is the case that a lean mixture turns into hotter gases out of the silencer, a rich mixture results in a colder exhuast most noticeable at idle. I'm talking here about using the palm of your hand to measure the heat.
I would be guided by the colour of the spark plugs rather than attaching too much meaning to a blue manifold.
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I'm not sure I could touch my exhaust at idle, it is a Delkevic stainless system so single skin but still runs very how
McCabe-Thiele (Ted):
Not the manifold - you put your palm a few inches away from the tail pipe.
Handy on a 500 as it reflects individual cylinders thus carbs
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