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+--- Thread: deleting an HCCI engine (/Thread-deleting-an-HCCI-engine)
deleting an HCCI engine - 6T56 - 12-08-2019
HCCI engines are heavily reliant on egr gas to control combustion and keep cylinder temps in check. If the egr gas is removed you lose the ability to control combustion and with such high compression ratio's you will certainly have cylinder temp and pressure to high right? How is all this accounted for in the delete programs?
RE: deleting an HCCI engine - Unilevers - 12-11-2019
(12-08-2019, 05:56 PM)6T56 Wrote: HCCI engines are heavily reliant on egr gas to control combustion and keep cylinder temps in check. If the egr gas is removed you lose the ability to control combustion and with such high compression ratio's you will certainly have cylinder temp and pressure to high right? How is all this accounted for in the delete programs?
you would need to take this heavily into account. Completely redoing the timing maps and editing any modifiers to the managers with a retard across the board. Then obviously charge flow will have to be heavily remapped to reflect this removal of EGR to run safely and keep cylinder pressures in check.
If not you melt it down, lower the final crank angle and take out the crank/wrist pin/rod, put a hole in a piston, or crack the head and push the gasket.
There is much more but this would be the general overview.
RE: deleting an HCCI engine - 6T56 - 12-12-2019
(12-11-2019, 08:55 PM)Unilevers Wrote:(12-08-2019, 05:56 PM)6T56 Wrote: HCCI engines are heavily reliant on egr gas to control combustion and keep cylinder temps in check. If the egr gas is removed you lose the ability to control combustion and with such high compression ratio's you will certainly have cylinder temp and pressure to high right? How is all this accounted for in the delete programs?
you would need to take this heavily into account. Completely redoing the timing maps and editing any modifiers to the managers with a retard across the board. Then obviously charge flow will have to be heavily remapped to reflect this removal of EGR to run safely and keep cylinder pressures in check.
If not you melt it down, lower the final crank angle and take out the crank/wrist pin/rod, put a hole in a piston, or crack the head and push the gasket.
There is much more but this would be the general overview.
Thanks for the reply, how would you know how much to retard timing?
RE: deleting an HCCI engine - DewDewMax - 12-16-2019
(12-12-2019, 08:10 PM)6T56 Wrote:(12-11-2019, 08:55 PM)Unilevers Wrote:(12-08-2019, 05:56 PM)6T56 Wrote: HCCI engines are heavily reliant on egr gas to control combustion and keep cylinder temps in check. If the egr gas is removed you lose the ability to control combustion and with such high compression ratio's you will certainly have cylinder temp and pressure to high right? How is all this accounted for in the delete programs?
you would need to take this heavily into account. Completely redoing the timing maps and editing any modifiers to the managers with a retard across the board. Then obviously charge flow will have to be heavily remapped to reflect this removal of EGR to run safely and keep cylinder pressures in check.
If not you melt it down, lower the final crank angle and take out the crank/wrist pin/rod, put a hole in a piston, or crack the head and push the gasket.
There is much more but this would be the general overview.
Thanks for the reply, how would you know how much to retard timing?
Data Logging and carefully monitoring inlet/exhaust temps. The ability to monitor cylinder pressures would help but that can get pricey...when you think you got it right, tear down and inspection of bearings, valve seats, wrist pins, cylinders etc.
RE: deleting an HCCI engine - 6T56 - 01-21-2020
How much different is PCCI than HCCI ? What method is used on newest generation of truck engines?