12-07-2018, 02:22 PM | #239 |
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Video of the mid-engine running at Sebring at night. Good recording of the engine sound..
[ame]https://www.youtube.com/watch?v=kfg71KgtxO4[/ame]
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Olivia 05/03/2012 - 01/06/2024. 231,146 glorious miles.
Visit my Owner's Journal where I wax philosophic on all things FR-S Post your 86 or see others in front of a(n) (in)famous landmark. What fits in your 86? Show us the "Junk In Your Trunk". |
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12-07-2018, 02:44 PM | #240 |
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12-07-2018, 08:36 PM | #242 |
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I'm liking the profile better than I thought I would as well
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Olivia 05/03/2012 - 01/06/2024. 231,146 glorious miles.
Visit my Owner's Journal where I wax philosophic on all things FR-S Post your 86 or see others in front of a(n) (in)famous landmark. What fits in your 86? Show us the "Junk In Your Trunk". |
12-15-2018, 03:26 PM | #243 |
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The first variant will be the LT2 (similar to LT1). I'm not sure what the delay is on the vehicle side, but powertrain side is all go!
Next, the flat-plane V8 with 5.5L naturally aspirated. Red line is 8600 rpm. I don't quite remember the power figures. Due to the flat plane, there are very very high vibrations horizontally. Drivers were complaining about fingers going numb after driving! I know Ford managed a flat-plane too, but their crank shaft is a lot heavier with the balancing counterweights. So they basically "cheated". But the LT6 has a much lighter crank. Later on, the LT6 will be given twin-turbos, and renamed the LT7. This is a beast, with about 850 hp. I am not directly involved with the LT7, so I can't give any more info than that. The LT6 has a lot of vibrations and exhaust overheating issues. It is benchmarked against the Ferrari 488. But no one has ever done a flat-plane engine with such high displacement (5.5L). |
12-15-2018, 03:39 PM | #244 |
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Why is that cheating?
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12-15-2018, 04:09 PM | #245 |
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12-15-2018, 04:13 PM | #246 |
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And because of the high red line, there is a lot of oil starvation at the journals. As of May 2018, there was no solution to it. No clue what all they did since then to mitigate
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12-15-2018, 04:41 PM | #247 |
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Take some out of the flywheel and call it good. First manage flutter. Then get what you can from it.
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12-15-2018, 05:43 PM | #248 | |
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Quote:
With such high piston speeds and rotating/reciprocating con rods, pins, journals, etc., you benefit more from having a lighter crank than a lighter flywheel. 8600rpm from a 5.5L.... I should tip my hat to my ex-colleagues at GM! |
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12-15-2018, 05:48 PM | #249 |
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By the way, the flywheel mass actually helps dampen out the crank torsional vibrations. It helps a lot with the durability of the accessory drive system. In turn, a smooth accessory drive makes life a lot easier for the block, front cover & head, wherever they are bolted.
Lighter flywheels for road applications is just a fad. |
12-15-2018, 05:59 PM | #250 | |
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Mid Engine Corvette Delayed Six Months Over Electrical Issue: Breaking
Quote:
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12-15-2018, 06:17 PM | #251 | |
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Quote:
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12-15-2018, 06:30 PM | #252 |
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Not quite sure what the delay with the LT2 is.
When I worked there, I worked almost solely on the LT6. By then, the development of the LT2 was already over and the Corvette mules were running around. So I'm not an expert with the LT2. There is just way too much heat under the trunk for the MR layout, that much I know. |
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