would LPG and Miller Cycle make a good combination?
would LPG and Miller Cycle make a good combination?
(OP)
I've recently started looking into LPG and from what i've learnt so far, because of its high RON (~110+) i'm thinking it would be very suitable to supercharging...but what about miller cycle? the engine i have in mind is the Mazda 2.25L KJ-ZEM V6 engine.
Could there be a danger of backfires in the inlet manifold(frontfires)?
any thoughts on this?
thanks
Could there be a danger of backfires in the inlet manifold(frontfires)?
any thoughts on this?
thanks





RE: would LPG and Miller Cycle make a good combination?
Many SAE papers cover industrial engines operating on the Miller cycle running on natural gas, LPG and process gas (a mish-mash of light hydrocarbons with CO, CO2, N2, etc. as impurities.
Burning hydrogen is a different story when it comes to backfiring risk...
All else being equal, (boost pressure, etc.), expect lower full-load power, due to the volume displacing effect of the propane gas, and lack of charge cooling that has been widely posted already.
RE: would LPG and Miller Cycle make a good combination?
RE: would LPG and Miller Cycle make a good combination?
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RE: would LPG and Miller Cycle make a good combination?
Failing that, I assume this Miller cycle engine is supercharged. Injecting the propane just before the compressor will reduce compressor work (because the specific heat ratio will be reduced).
Lotus exploits this thermodynamic phenomenon and injects E85 pre-compressor in the not-for-production Exige 265E. It cools the charge and reduces the compressor work simultaneously, and quite substantially at that.
RE: would LPG and Miller Cycle make a good combination?