Quote:
Originally Posted by Knightrider966
I should also point out that after reading your questions, I think you think I meant that these engines were 50:1 at a normal startup. Not so and I didn't mean to confuse anyone, but sometimes I get lost in my little engineering details, heh heh! A 50:1 diesel will first light up at about 25:1.
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As FI mentioned above, when we refer to compression ratio, we're talking about static compression ratio. Simply take the volume of the cylinder with the piston at BDC and compare it to the volume of the cylinder at TDC. That's your ratio.
If you then manage a higher effective ratio via the use of additional boost pressure, that's another condition altogether and it's got nothing to do with the static compression ratio.
Even 25:1 is significant for a diesel when looking at static compression ratio. Clearance for the valves becomes a significant problem. Were these DI engines?
02-03-2007, 01:45 PM
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