non reciprocating
- Thread starter Stilgar
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Several of these heat pump engines exist, only the claimed yeild does not match the advertising, otherwise they'd be in use before you finished reading this post.
I’ve been thinking about this and I’m wondering how the engine interfaces with the transmission. You can’t just have an engine driving the wheels directly, unless you’re using an electrical engine, because you’d have to constantly shut the engine off and turn it back on.
They show this engine that can drive a car and it’s the size of a coffee can. It would be interesting to see how the engine mates to a transmission. It’s also interesting how something the size of a coffee can producing a massive amount of torque can be constrained by engine mounts.
They show this engine that can drive a car and it’s the size of a coffee can. It would be interesting to see how the engine mates to a transmission. It’s also interesting how something the size of a coffee can producing a massive amount of torque can be constrained by engine mounts.
If they can keep an 8 thousand horse powered top fuel dragster engine constrained by mounts I don`t think this little coffee can unit is going to be any trouble. 
That’s a good point. It’s just that relative to the size of the engine, the mounts would need to be rather large. They show two engines mounted together and they are only 14 x 14 inches. Then they have intake and exhaust ports so the mounts would need to be places away from the ports. Once you get down the size of a coffee can, you aren't left with much surface area for mounts.
Cat Fuzz
Qualthwar's Minion. Ph34r!
Cat Fuzz
Qualthwar's Minion. Ph34r!
Looking at the cutaway video, I realy don`t see how this unit is going to last. 25:1 compression with just two rings....can you say masive blowby?!
Also holding the pistion by the pin on the side of the pistion is wack, under heavy load the shearing force on that pin is going to be huge!
Also holding the pistion by the pin on the side of the pistion is wack, under heavy load the shearing force on that pin is going to be huge!
I had some similar thoughts. I think these engines have 16 or 32 pistons. I guess it depends on how they have the engines joined or whatever. But let’s say they have a 32 piston engine. That seems like there is more to go wrong compared to a 4,6, or 8 cylinder engine.
However, according to the videos, there are less parts, therefore less to go wrong. As Rukee pointed out, there are stresses and the parts receiving a lot of stress would be the 32 pistons. There my be less parts, but it seems like there are more parts under high stress with this engine, which translates into more that can go wrong.
For example, a normal engine might have a problem with a timing chain, rocker arm, pushrod, etc., but they aren’t subjected to huge forces like the cylinders are. But take that up a notch! A normal engine might have a compression ration of 8:1, while this thing has a ratio of 25:1. That means there are far more stresses in the combustion chamber.
Another consideration: let’s say you have a regular engine and you break a piston ring, or a rod breaks, or something like that. The effects are isolated to that one cylinder. But with this engine, it seems like a lot of damage could result; enough to make the engine quit completely. If one of those pistons broke off, it could lock up everything.
However, according to the videos, there are less parts, therefore less to go wrong. As Rukee pointed out, there are stresses and the parts receiving a lot of stress would be the 32 pistons. There my be less parts, but it seems like there are more parts under high stress with this engine, which translates into more that can go wrong.
For example, a normal engine might have a problem with a timing chain, rocker arm, pushrod, etc., but they aren’t subjected to huge forces like the cylinders are. But take that up a notch! A normal engine might have a compression ration of 8:1, while this thing has a ratio of 25:1. That means there are far more stresses in the combustion chamber.
Another consideration: let’s say you have a regular engine and you break a piston ring, or a rod breaks, or something like that. The effects are isolated to that one cylinder. But with this engine, it seems like a lot of damage could result; enough to make the engine quit completely. If one of those pistons broke off, it could lock up everything.