"marshknute" (marshknute)
06/29/2020 at 13:05 • Filed to: None
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"marshknute" (marshknute)
06/29/2020 at 13:05 • Filed to: None | 0
| 11 |
According to Matt Farah, the 4.0 engine in the new GT4 is actually based on the 3.0T from the regular Carrera, rather than a detuned version of the GT3's 4.0.
Can anyone verify this??? (skip to 1:44 if it doesn’t autoplay from that timestamp)
Milky
> marshknute
06/29/2020 at 13:20 |
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Yea m8, from car and driver:
The flat-six at the heart of this car, while it displaces 4.0 liters like the one in the temporarily discontinued 911 GT3, is not at all related to that engine. Instead, it is a naturally aspirated development of the twin-turbocharged family that powers the 911.
Makes sense if you have to keep the 911 on a pedestal.
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marshknute
> Milky
06/29/2020 at 13:29 |
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Wow, thanks for finding that!
Thomas Donohue
> marshknute
06/29/2020 at 13:30 |
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If I recall correctly , the GT3 engine wouldn’t fit when rotated 180 degrees. Not sure if that was the real reason or not.
The new 718 Cayman GT4 uses a 4.0-liter, 8000-rpm, bored, stroked, and turbo-free version of the 992-generation 911's 3.0-liter 9A2EVO engine. Hitting the high notes requires new cylinder heads, valves, pistons, connecting rods, and crankshaft. The intake manifold, with two resonance flaps, is also new.
davesaddiction @ opposite-lock.com
> marshknute
06/29/2020 at 13:33 |
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Yeah, been known for a while.
Still a great engine, but not GT3 great!
Arrivederci
> marshknute
06/29/2020 at 13:50 |
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Yep, it’s a bored out 3.0TT with the turbos removed.
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marshknute
> Arrivederci
06/29/2020 at 14:52 |
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That seems like the most needlessly complicated solution, but I’m no engineer!
for Michigan
> Milky
06/29/2020 at 16:59 |
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I wonder if the GT3 engine wouldn’t meet emissions anymore or something like that. Seems the most likely reason for them to develop a whole new 4.0L rather than use what they already had.
Or maybe the old one just didn’t fit.
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for Michigan
> Thomas Donohue
06/29/2020 at 17:00 |
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Yeah, I would guess either packaging or emissions.
BoxerFanatic, troublesome iconoclast.
> marshknute
06/30/2020 at 01:39 |
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Actually, it is less complicated, because the GT3 engine uses more sophisticated engineering and materials that make it prohibitively expensive for Cayman’s price point.
Most modern engine designs are modular, and can be manufactured with various bore, stroke, and compression ratios.
But engines that rely on titanium, magnesium, or other rarer materials with manufacturing complications, extensive dry-sump oiling systems, and cooling systems that are pretty much motorsport-ready AND factory warranty covered, like the GT3 line, the engine gets EXPENSIVE.
Changing the bore, stroke, and static compression on a fairly mainstream aluminum and steel engine, and leaving the external turbochargers off, is less expensive, and keeps the Cayman GT4 and Boxster Spyder’s base price under 6 figures, where GT3 tends to cost nearly 200 grand.
And it leaves money on that budgetary table for GT4 to use GT3's suspension, which is arguably the better choice... GT4 is not hurting for power, even with the Carrera-derived engine... the suspension is what makes it unique, even compared to the new stable-mate GTS 4.0.
bmil128
> marshknute
06/30/2020 at 09:00 |
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I think the other reason (as was done on the first GT4) is that the plenum from the 911 engine is too tall for the Cayman chassis
Axial
> BoxerFanatic, troublesome iconoclast.
07/01/2020 at 00:58 |
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> GT4's price point
> Under 6-figures
Lol. I mean, I know what the entry MSRP is, but nobody is going to even be able to take delivery of one at that price.
Anywho, rest of the post is spot-on, just had to poke fun at that.