> Toyota was trying to achieve something, and the devil is in the details.
> Taken as a SYSTEM, the Toyota Hybrid Synergy Drive is a rolling work of
> art--and the SYSTEM includes the vacuum bottle.
> But by itself, would adding the vacuum bottle to a normal car do
> anything for it? Sure, it would do the same thing--that is, present
> warm coolant to the engine so that the engine heats up faster to help
> lower emissions. But if the rest of the car isn't particularly tuned
> for that task, the vacuum bottle would e a lot of complication and cost
> for very little effect.
IIRC the flask was required for the USA spec PZEV emissions rating, along
with the bladder in the fuel tank. Other countries got neither device but
some did get rear disk brakes.
The NHW11 had an HCAC system (hydrocarbon absorptive catalyst), the NHW20
has the flask, and the ZVW30 has exhaust heat recovery. All 3 systems
lessen the unburnt fuel emitted on a cold start.
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> Taken as a SYSTEM, the Toyota Hybrid Synergy Drive is a rolling work of
> art--and the SYSTEM includes the vacuum bottle.
> But by itself, would adding the vacuum bottle to a normal car do
> anything for it? Sure, it would do the same thing--that is, present
> warm coolant to the engine so that the engine heats up faster to help
> lower emissions. But if the rest of the car isn't particularly tuned
> for that task, the vacuum bottle would e a lot of complication and cost
> for very little effect.