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Old 11-15-2019, 02:48 AM   #62973
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I did about 20 years ago.
Well, seeeeeeeeeeee


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Old 11-15-2019, 03:07 AM   #62974
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Hells bells, we had variable compression engines commercially produced back in the 30s.

Iffen ya don't believe that, just try starting one of these suckers without knowing about it -


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Old 11-15-2019, 05:49 AM   #62975
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Nice tractor

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Old 11-15-2019, 07:34 AM   #62976
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Nice tractor

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Old 11-15-2019, 07:46 AM   #62977
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Hells bells, we had variable compression engines commercially produced back in the 30s.

Iffen ya don't believe that, just try starting one of these suckers without knowing about it -


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I had at least a couple of cars that had variable compression. They weren't supposed to be variable but they were.
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Old 11-15-2019, 08:16 AM   #62978
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I had at least a couple of cars that had variable compression. They weren't supposed to be variable but they were.
Mine varied depending on what cylinder you picked.
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Old 11-15-2019, 08:27 AM   #62979
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Mine varied depending on what cylinder you picked.
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Old 11-15-2019, 09:49 AM   #62980
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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.
Absolutely but Nissan's solution seems somewhat elaborate to me. I agree with the poster who called it "marketing "
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Old 11-15-2019, 10:04 AM   #62981
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Hells bells, we had variable compression engines commercially produced back in the 30s.

Iffen ya don't believe that, just try starting one of these suckers without knowing about it -


humfrz
No messing with that steering set-up.. couldn't be more direct. I wonder if anyone has tried a similar mod on their Twin.
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Old 11-15-2019, 10:26 AM   #62982
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No messing with that steering set-up.. couldn't be more direct. I wonder if anyone has tried a similar mod on their Twin.
Dat camber though! Need more low and Rocket Bunny.


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Old 11-15-2019, 10:33 AM   #62983
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Aw shit, finally able to pull the required documents and open a business checking account. Time to spend some money!
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Old 11-15-2019, 11:49 AM   #62984
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Absolutely but Nissan's solution seems somewhat elaborate to me. I agree with the poster who called it "marketing "
Can you describe a simpler solution to achieve variable compression?
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Old 11-15-2019, 12:27 PM   #62985
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Can you describe a simpler solution to achieve variable compression?
Hole in the block could be one such 'simpler solution' to achieve variable compression..
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Old 11-15-2019, 12:33 PM   #62986
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Hole in the block could be one such 'simpler solution' to achieve variable compression..
Could even make it controllable.


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