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DI + PFI in Ford F-150 Engines #4490201
08/16/17 01:41 PM
08/16/17 01:41 PM
Joined: Jan 2006
Posts: 2,653
Idaho
SubLGT Offline OP
SubLGT  Offline OP
Joined: Jan 2006
Posts: 2,653
Idaho
I thought the purpose of adding port injection to a direct injected engine was to keep the intake valves clean, but it also has other benefits.

http://articles.sae.org/15574/

Quote:
Pete Dowding, Ford Powertrain’s well-travelled chief engineer, told Automotive Engineering the cost of moving all the F-150’s engines to the direct- and indirect-injection layout is justified by the increased fuel economy the design permits—largely because of the higher compression ratios (CR) available from overlaying PFI onto DI. At high load, DI cools the cylinder sufficiently to maintain a high CR without high-octane unleaded. At lower loads, “the DI system bleeds off,” Dowding said, and PFI takes priority, delivering efficient cylinder-fill while still reaping the BMEP benefit of higher compression.

For the newly-downsized V6, the twin-injection system allows a CR increase from 10.8:1 to 12:1. For the heavily-revised 2.7-L turbocharged DOHC V6, the next engine up the F-150 food chain, CR goes from 10:1 to 10.3:1 and for the pickup’s lithe “Coyote” 5-L DOHC V8, CR is boosted from 10.5:1 to 12:1.

Re: DI + PFI in Ford F-150 Engines [Re: SubLGT] #4490203
08/16/17 01:45 PM
08/16/17 01:45 PM
Joined: Dec 2010
Posts: 436
Indianapolis, IN
09_GXP Offline
09_GXP  Offline
Joined: Dec 2010
Posts: 436
Indianapolis, IN
The intake valve buildup "issues" were largely taken car of early on with slight design changes to the valves. They can actually get pretty dirty before any performance hits are noticed. In these systems the performance benefits are the main advantage while keeping the intake valves clean is a side effect.


2017 Miata Global Cup Car #02 - Castol A3/B4 5w30 w/ OEM Fitler
2017 Miata RF - PP 0w20 w/ M1 Filter
2015 F-150 2.7L Ecoboost - PPPP 5w30 w/ MC
Re: DI + PFI in Ford F-150 Engines [Re: SubLGT] #4490204
08/16/17 01:46 PM
08/16/17 01:46 PM
Joined: Aug 2003
Posts: 12,908
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 12,908
NE,Ohio
Interesting

The CR is impressive.. 12:1 and turbocharged???

12:1 NA is pretty good by itself IMO.

My tractor from 1984 is a whopping 6.2:1


2019 Jeep Cherokee Trailhawk 2.0T
Re: DI + PFI in Ford F-150 Engines [Re: Rand] #4490216
08/16/17 01:57 PM
08/16/17 01:57 PM
Joined: Jan 2006
Posts: 2,653
Idaho
SubLGT Offline OP
SubLGT  Offline OP
Joined: Jan 2006
Posts: 2,653
Idaho
Originally Posted By: Rand
Interesting

The CR is impressive.. 12:1 and turbocharged???


Non-turbo V8 I think.

Re: DI + PFI in Ford F-150 Engines [Re: Rand] #4490329
08/16/17 04:24 PM
08/16/17 04:24 PM
Joined: Dec 2010
Posts: 436
Indianapolis, IN
09_GXP Offline
09_GXP  Offline
Joined: Dec 2010
Posts: 436
Indianapolis, IN
Originally Posted By: Rand
Interesting

The CR is impressive.. 12:1 and turbocharged???

12:1 NA is pretty good by itself IMO.

My tractor from 1984 is a whopping 6.2:1


12:1 for the NA engines only, the new 3.3L V6 and the V8. The Ecoboost engines are the 2.7 and 3.5.


2017 Miata Global Cup Car #02 - Castol A3/B4 5w30 w/ OEM Fitler
2017 Miata RF - PP 0w20 w/ M1 Filter
2015 F-150 2.7L Ecoboost - PPPP 5w30 w/ MC
Re: DI + PFI in Ford F-150 Engines [Re: 09_GXP] #4492604
08/19/17 08:26 AM
08/19/17 08:26 AM
Joined: Sep 2009
Posts: 325
Rockies
Scdevon Offline
Scdevon  Offline
Joined: Sep 2009
Posts: 325
Rockies
Originally Posted By: 09_GXP
[quote=Rand]

12:1 for the NA engines only, the new 3.3L V6 and the V8. The Ecoboost engines are the 2.7 and 3.5.


N/A compression ratios have been creeping up for a long time with advances in fuel injection and knock sensors.
My 2003 Mustang Mach 1 has 10.1:1 which I thought was great in 2003. Smog cars in the 1970s had as low as 7:1 in some cases.

Compression ratios fell off of a cliff (cam specs too) around 1973 because it was the only way to get engines designed in the 1960s to pass 1970s emissions standards, but lately compression ratios have been eye-popping good !!


2003 Mustang Mach 1. 32V 4.6 Liter. Motorcraft Syn Blend 5W30
1970 Mustang Convertible 302-2V Auto (Stock) M/C 10W30
1970 VW Beetle 1600 DP

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