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Old 03-21-2018, 08:03 AM   #4999
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Hereís some photos of the Achates 2.7L O3 that I took right after their press conference at NAIAS. The F150 it is installed in is definitely a running vehicle. I talked to the engineer on the project after the press conference. It achieved 37 mpg in their testing.
The OP engine design has been around for a looong time. Apparently there are two major issues that Achates have to demonstrate they've overcome ... engine life longevity and emmisions both due to piston/cylinder lubrication. See the following comment on Green Car Congress website in response to Achates announcement.

"The surface-to-volume relationship of the combustion chamber is better during the combustion phase with this arrangement (should favor lower heat losses), but ... call me a skeptic because of the piston porting that is inherent in this design. There is lubrication - oil - on the crank side of the pistons - the piston rings and cylinder walls require lubrication. Every time the piston rings pass the ports, a little bit of oil tends to get out into the port, and that's either going into the cylinder (intake ports) or out the exhaust (exhaust ports). If the rings are supplied with adequate lubrication, the emissions are worse. If the rings are supplied with sparse lubrication, longevity suffers.

Detroit Diesel built piston-ported two-stroke diesel engines for decades, even using electronic injection control towards the end, and with all that experience, could not solve the emissions problems, and switched to four-strokes.

I see nothing about this engine that is indicative of a magic solution to the piston porting emissions versus lubrication trade-off.

I share the same skepticism about ALL of the opposed-piston two-stroke concepts and for the same reasons."
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Old 03-21-2018, 08:31 AM   #5000
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So where the heck is this thing?
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Old 03-21-2018, 10:44 AM   #5001
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I guess the new truck engines will be detailed next week on March 26th after all.
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Old 03-21-2018, 10:58 AM   #5002
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I guess the new truck engines will be detailed next week on March 26th after all.
I guess. *grumbles*
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Old 03-21-2018, 12:45 PM   #5003
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Insight to the 2019 Camaro SS engine too
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Old 03-21-2018, 01:53 PM   #5004
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Insight to the 2019 Camaro SS engine too
The 2019 Corvette LT1 has no changes, as far as I can find.
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Old 03-21-2018, 02:17 PM   #5005
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Is that a first that the truck engines get an update and the car doesn’t?
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Old 03-21-2018, 04:01 PM   #5006
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Is that a first that the truck engines get an update and the car doesnít?
No. There was a long span of time between the trucks getting AFM and the cars getting it. Likewise, there was a long span of time from when cars got aluminum block until the trucks finally got it.
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Old 03-21-2018, 04:02 PM   #5007
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BTW - The new engine broke surface today. For those who didn't see it, it is a 4.2L Twin Turbo V8 for Cadillac. First use comes in the CT6 V-Sport. FenwickHockey65 started a thread on it.
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Old 03-21-2018, 04:59 PM   #5008
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So as much as I love the 4.2TT...I want truck news.

Here's hoping for something next week.
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Old 03-21-2018, 05:35 PM   #5009
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No. There was a long span of time between the trucks getting AFM and the cars getting it. Likewise, there was a long span of time from when cars got aluminum block until the trucks finally got it.
I thought that DoD/AFM was (re)introduced in 2005 on both cars & SUV's with the 5.3L V8? Specifically the Impala/Grand Prix as well Trailblazer/Envoy
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Old 03-21-2018, 05:45 PM   #5010
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I thought that DoD/AFM was (re)introduced in 2005 on both cars & SUV's with the 5.3L V8? Specifically the Impala/Grand Prix as well Trailblazer/Envoy
Trailblazer and Envoy V8 were first. Impala and Grand Prix were with the 3.9L V6 if I remember correctly. I honestly can’t remember what year we put the V8 in FWD Impala (Impala SS). The first FWD Impala SS cars were 3.8SC, not V8. There was a lot of controversy internally about putting the V8 in that architecture. It eventually happened, but it wasn’t without a ton of engineering effort. I do recall that Corvette didn’t get it for a long time and Camaro didn’t get it until LT1.
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Old 03-21-2018, 06:24 PM   #5011
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Trailblazer and Envoy V8 were first. Impala and Grand Prix were with the 3.9L V6 if I remember correctly. I honestly canít remember what year we put the V8 in FWD Impala (Impala SS). The first FWD Impala SS cars were 3.8SC, not V8. There was a lot of controversy internally about putting the V8 in that architecture. It eventually happened, but it wasnít without a ton of engineering effort. I do recall that Corvette didnít get it for a long time and Camaro didnít get it until LT1.
Camaro got AFM with the L99.
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Old 03-21-2018, 06:29 PM   #5012
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Trailblazer and Envoy V8 were first. Impala and Grand Prix were with the 3.9L V6 if I remember correctly. I honestly canít remember what year we put the V8 in FWD Impala (Impala SS). The first FWD Impala SS cars were 3.8SC, not V8. There was a lot of controversy internally about putting the V8 in that architecture. It eventually happened, but it wasnít without a ton of engineering effort. I do recall that Corvette didnít get it for a long time and Camaro didnít get it until LT1.
2005 was the year of the V8 Impala SS/Grand Prix GXP

Camaro got AFM in the 2010 model year with the L99 in automatic equipped SS's
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