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GR86 General Topics (2nd Gen 2022+ Toyota 86) General topics for the GR86 second-gen 86 |
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02-04-2023, 12:18 PM | #113 | |
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In short, the outside facing head fills with oil given enough time. We see the same thing happen on long and/or banked corners like the Nurburgring's Karussel. It's banked and +180°. Competitive Subies would slow down considerably on this corner until oiling solutions were developed. IMO, this starvation is happening because oil is sloshing into the timing cover, which is a big cavity, and roping on the chain causing a significant drop in oil level. The pan is perfectly shaped to channel oil up and forward, and the upper pan/block have more open area on the left side for oil to pool under braking right turns. Horizontal baffles are not the solution for this type of condition, which is why some have seen no change when using them. I have a handful of prototype baffles that are to be made next week and will be testing them. Anyone who seriously tracks, has datalogging capabilities, and is brave enough to test prototype parts is more than welcome to reach out to us for upcoming beta testing opportunities. |
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02-07-2023, 08:33 PM | #114 | |
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Start @ 6:34 |
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02-07-2023, 11:36 PM | #115 | |
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But yeah, are there any full teardowns videos of the FA24D yet? |
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02-08-2023, 12:44 AM | #116 | |
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What I did notice was the new block has a LOT more ribbing. There is almost none that I could see on the old FA20. |
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02-08-2023, 01:14 AM | #117 | |
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Lower oil pan (the one people drop for RTV cleaning) doesn't have any baffle at all. What is already present on the car to prevent oil sloshing is actually not very relevant now. They are not sufficient to prevent oil pressure drops. The pressure readings doesn't cheat, the engine does have oil pressure drop behavior at certain right turns with large lateral G. We just don't know for sure if that is severe enough to be a problem. |
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02-08-2023, 07:24 AM | #118 | |
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The design changes are marginal. The guy in the vid seems to express 'significant upgrades', but the data says otherwise. |
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02-12-2023, 03:58 PM | #119 |
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Just more observations: I just watched the last three of @zeroomega's videos (since another new one popped up on youtube for me today) and on each of them, it really seems like combined gees of 1 in lateral/long on right handers (quadrant 2) is where this occurs:
Each of the significant drops starts around that area on the gee circle. It also occurs in situations where I'd think there has been enough time for oil to return to the pan, such as at 30 seconds in on this video: It doesn't seem to be braking alone as I don't see it occur under straight line braking, but it does occur at the slightest amount of lateral accel on right handers (again, anything in quadrant 2) that exceeds 1g combined... |
02-12-2023, 07:20 PM | #120 |
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IMO, braking followed by a right-hand turn is causing sloshing into the timing cover and into the left had side of the timing cover, where there are no drains. As the car straightens out, oil can flow back into the pan through the center drain back from the timing cover.
The timing cover is a HUGE cavity and the oil pan shaped like a finnel into it, doesn't help. Additionally, you have a high-speed chain in there that will draw (rope) and hold for a period, a decent amount of oil. This would explain why flat horizontal baffle plates (in the pan or between upper and lower pan) do little, since the upper pan holds more oil than the lower. If this baffle that blocks the timing cover opening works well for us, it will be a simple and effective solution. We'll find out... |
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02-14-2023, 09:41 AM | #121 | |
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02-14-2023, 10:05 AM | #122 |
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