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Old 11-14-2019, 08:27 PM   #62959
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To lower compression you would have to increase the combustion chamber volume at TDC. Since piston and rod heights are fixed the only way to increase chamber volume is to alter the stroke.
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Old 11-14-2019, 09:47 PM   #62960
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Also to add... stroke changes, so not only compression ratio change, but displacement changes (bore x stroke)? So is it more (or less) than 2 liter?
Yes.
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Old 11-14-2019, 09:53 PM   #62961
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I suggest mentally picturing the system on end and consider how the cylinder bore and crankshaft axis of rotation are both fixed.
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Old 11-14-2019, 10:05 PM   #62962
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Old 11-14-2019, 10:37 PM   #62963
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I'm lucky if they even put the plates on the rack and wipe down their equipment when done at my gym. The evening crowd is lazy.
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Old 11-14-2019, 11:15 PM   #62964
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I'm lucky if they even put the plates on the rack and wipe down their equipment when done at my gym. The everyone is lazy.
fixed it
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Old 11-14-2019, 11:35 PM   #62965
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What is the point of variable compression ratio?
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Old 11-14-2019, 11:39 PM   #62966
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What is the point of variable compression ratio?
Lower CR under boost. Higher when cruising with cracked throttle. CR profile is tailored to further maximize ignition advance across a wider range of operating conditions. (gamut?)


Now I'm going to go study to see if I'm in the ballpark.
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Old 11-15-2019, 12:02 AM   #62967
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Ok, yeah, I'm a smartypants.
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Old 11-15-2019, 12:49 AM   #62968
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What is the point of variable compression ratio?
Higher pressure results in less losses to entropy during combustion. In theory you want the highest compression you can get at all times. But the limiting factor is the tendency of gasoline/air to detonate when you compress it too quickly. By decreasing the maximum pressure, you decrease the rate of compression. Thus allowing higher rpm, advancing timing, and more fuel/air (higher boost) at higher temperatures.

Being able to tune the compression ratio gives you the best of both worlds in the same engine.
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Old 11-15-2019, 01:21 AM   #62969
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Ok, yeah, I'm a smartypants.
- you peaked!




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Old 11-15-2019, 01:55 AM   #62970
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Quote:
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What is the point of variable compression ratio?
Marketing.
https://www.caranddriver.com/feature...-fuel-economy/
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Old 11-15-2019, 02:25 AM   #62971
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- you peaked!




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I did about 20 years ago.
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Old 11-15-2019, 02:48 AM   #62972
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I did about 20 years ago.
Well, seeeeeeeeeeee


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