Best way to build a hybrid truck?

[freebeard]

rmay635703 --There could be a list compiled of threads that were improved when the OP hit and ran.

[cRiPpLe_rOoStEr]

Originally Posted by Isaac Zachary

Of course the downside is vibration. A single piston engine would be terribly unbalanced. It would also get a power stroke once every 720⁰ making it even more shaky.

I must confess I'd still be quite tempted to build something like an oversized Honda Cub engine and try it into a truck. Could eventually make it a hybrid.

[freebeard]

Of course the downside is vibration.

Depends. This is offtopic so I put it The Lounge: Lucky Will - "FOR A FEW DOLLARS MORE"

[Isaac Zachary]

Originally Posted by cRiPpLe_rOoStEr

I must confess I'd still be quite tempted to build something like an oversized Honda Cub engine and try it into a truck. Could eventually make it a hybrid.

I've always thought that if you could make the hybrid portion extremely efficient then an engine that (efficiently) puts out slightly more power than you'd need on average (on the highway) would work great. Then the engine could run at an optimal load and RPM all the time. No need for an oversized engine, the hybrid part would take over and give you more power when needed.

[cRiPpLe_rOoStEr]

Originally Posted by Isaac Zachary

No need for an oversized engine

What I meant when I considered an "oversized Honda Cub engine" would be basically a scaled-up design based on some features of the actual Honda Cub engine. A horizontal-single, eventually retaining the air-cooling, would be cool. On a sidenote, as it would eventually be the case to get a magneto with a much higher output, that would sound like a reasonable excuse to try a 48-volt setup for the mild-hybrid capabilities too.

[Isaac Zachary]

Originally Posted by cRiPpLe_rOoStEr

What I meant when I considered an "oversized Honda Cub engine" would be basically a scaled-up design based on some features of the actual Honda Cub engine. A horizontal-single, eventually retaining the air-cooling, would be cool. On a sidenote, as it would eventually be the case to get a magneto with a much higher output, that would sound like a reasonable excuse to try a 48-volt setup for the mild-hybrid capabilities too.

Sorry about that. I wasn't referring to your Honda Cub engine not needing to be "oversized." I was referring to engines in general that wouldn't need to be "oversized" for the average power needs of a vehicle if it had a robust enough hybrid system.

[cRiPpLe_rOoStEr]

Originally Posted by Isaac Zachary

I was referring to engines in general that wouldn't need to be "oversized" for the average power needs of a vehicle if it had a robust enough hybrid system.

Indeed. Well, maybe even an engine with a comparatively larger displacement could end up not being effectively "oversized" at all, while operating at a lower RPM with a peak torque greater than what a smaller engine would be operating.

[freebeard]

Stroker crank to add torque down low.

[Hersbird]

I don't know the specifics, but read when dodge put out the V10 in 1994 it was because the older 440 big block just couldn't get complete enough burn in the big cylinder holes to meet modern emissions. The v10 shared the same bore as the 360 V8 which had just been modernized in 1992.

So a reliable thumper like a Honda 90 may not scale up as well as you might think. Then again the biggest container ships use massive, massive reciprocating piston engines. They are efficient and meet modern emission requirements but emissions for 1000 foot container ships might be much more lax than new car emissions.

[Isaac Zachary]

Originally Posted by Hersbird

I don't know the specifics, but read when dodge put out the V10 in 1994 it was because the older 440 big block just couldn't get complete enough burn in the big cylinder holes to meet modern emissions. The v10 shared the same bore as the 360 V8 which had just been modernized in 1992.

So a reliable thumper like a Honda 90 may not scale up as well as you might think. Then again the biggest container ships use massive, massive reciprocating piston engines. They are efficient and meet modern emission requirements but emissions for 1000 foot container ships might be much more lax than new car emissions.

If cylinder size (several small cylinders vs a few big cylinders) has an effect on emission my guess is it would be NOx.

Say you take a single cylinder engine and an 8 cylinder engine both with the exact same displacement. The 8 cylinder engine will have 4 times the surface area (if I did my math right) that the combustion gasses will come into contact with and therefore absorb more heat. Absorbing more heat leads to cooler combustion which leads to lower NOx emissions but higher CO and HC emissions. But CO and HC emissions are much easier to deal with in a catalytic converter than NOx emissions.

The wankel engine has a poor volume to surface area design. Maybe making it much bigger would help that???