Random Thoughts - Part Deux [NO POLITICS]

[humfrz]

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

[p1l0t]

Nice tractor

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[Boomerang]

Originally Posted by p1l0t

Nice tractor

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[Tcoat]

Originally Posted by humfrz

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

I had at least a couple of cars that had variable compression. They weren't supposed to be variable but they were.

[Sapphireho]

Originally Posted by Tcoat

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.

[Tcoat]

Originally Posted by Sapphireho

Mine varied depending on what cylinder you picked.

[Lantanafrs2]

Originally Posted by Spuds

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 "

[JD001]

Originally Posted by humfrz

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.

[Tcoat]

Originally Posted by JD001

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.

[Nevermore]

Aw shit, finally able to pull the required documents and open a business checking account. Time to spend some money!

[Spuds]

Originally Posted by Lantanafrs2

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?

[JD001]

Originally Posted by Spuds

Can you describe a simpler solution to achieve variable compression?

Hole in the block could be one such 'simpler solution' to achieve variable compression..

[Tcoat]

Originally Posted by JD001

Hole in the block could be one such 'simpler solution' to achieve variable compression..

Could even make it controllable.

[Lantanafrs2]

Originally Posted by Spuds

Can you describe a simpler solution to achieve variable compression?

I wouldn't look for it in the first place. Not that big of an issue. All those reciprocating pieces. How about a good head unit? Or exhaust systems that dont rot out in 2 years?