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Originally Posted by Mr Twisty
They're claiming there's enough energy left in spent exhaust gas to do more work.
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I used to sit around and think of another way to reinvent the wheel (engines) all the time when I was younger... I think the test they've done is feasible, and it's cool to see it in action. The 3 cylinder engine is absolutely perfect for this setup.
What's a typical avg exhaust gas temp? Say 1000-1200 degrees under load? There could be some energy there to capture maybe?
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Originally Posted by DGthe3
It would seem to me that a cold cylinder would rob heat from the expanding gas -causing it to lose pressure faster, therefore producing less force against the piston (causing less torque, and by extension less power).
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I do agree, it would probably be weaker than the cylinders firing on fuel, but another thought comes to me based on what you said... Assuming the middle cylinder was sealed up well, If the cooling of the exhaust gas happened fast enough, it's possible that it could form a vacuum in the cylinder to pull the piston back up prior to the final exhaust valve opening?
But then again, as previously mentioned heat is energy. It appears they are robing energy from the turbo in this case?
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Originally Posted by DGthe3
Now, as for the 5 stroke ... its interesting, but an alternate solution exists: leave the intake valve open for a bit on the compression stroke. The net result is more or less the same, but it requires essentially 0 extra parts.
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What exactly does this achieve? Which cylinder(s)? I guess I'm not following you there?
I'm just going out on a limb here thinking outside the box...