Quote:
Originally Posted by LostCause
I think the best technological implementation of a turbo to improve fuel economy would create one hell of a complicated engine.
First, take a small atkinson cycle engine - 13:1 CR with an effective 8:1 CR. Use a small, efficient turbo ducted through an intercooler to raise the effective CR to ~10:1 (i.e. miller cycle). Use variable valve timing to increase the CR to 13:1 w/ turbo (which should already be operating in its most efficient range) and switch the injectors over to feed from a smaller tank holding 91 - 100 (avgas?) octane fuel during acceleration. Route the spent gasses through the primary turbo and feed the residual gas into a turbocompound that sends power back into the flywheel.
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I really like this idea... But I'd say remove the separate fuel tank and such....
Just go for a miller cycle engine with variable valve timing. It's probably not very difficult to have a valve profile that switches the engine from Atkinson to Otto while off boost... And considering Atkinson cycle isn't new and VVT isn't new and both concepts are implemented into mass produced vehicles - I wouldn't call it complicated at all
Alas, this isn't something that's easily DIYable
It sorta has to start from the mfr...