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Old 11-14-2012, 04:34 PM   #51 (permalink)
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Originally Posted by Arragonis View Post
Which diesels have a throttle plate ? Just interested.
Modern diesels can be "throttled".
Hägar has what you could describe as a throttle in the intake duct after the intercooler.
(And an intercooler bypass straight off the turbo that opens when it's regenerating, yanking up the intake temps.)

I'm thinking about doing some experimenting with these valves
(obviously not the throttle, but IC bypass and EGR).

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Old 11-14-2012, 05:36 PM   #52 (permalink)
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Originally Posted by radioranger
I guess this fits in this discussion, how can i add some adjustable aero braking for when i coast , so i dont overheat or wear out my brakes, ford escort sedan 1998, maybe sone ideas?
Both from Mercedes 300s, mid-1950s

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Old 11-14-2012, 05:40 PM   #53 (permalink)
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if you need that much aero drag for hypermiling you're doing it wrong
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Old 11-14-2012, 06:42 PM   #54 (permalink)
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There's a down-side to aerodynamic slipperiness, although the Mercedes race car is an extreme case.

Heavy vehicle?

Downhill?
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Old 11-14-2012, 06:54 PM   #55 (permalink)
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Both from Mercedes 300s, mid-1950s

Mercedes did not adopt disc brakes until after the 300 SLR. They needed that air brake to keep the drums from overheating and boiling the fluid out of the lines. Jag pioneered disc brakes at Lemans, but the 55 Chrysler 300 series had 4 wheel disc brakes the same year as Jag, I think.

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Old 11-14-2012, 08:43 PM   #56 (permalink)
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Hence the massive size. I always liked the perforated dive brakes on the SBD Dauntless:
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Old 11-15-2012, 02:28 AM   #57 (permalink)
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Originally Posted by Old Mechanic View Post
Mercedes did not adopt disc brakes until after the 300 SLR. They needed that air brake to keep the drums from overheating and boiling the fluid out of the lines. Jag pioneered disc brakes at Lemans, but the 55 Chrysler 300 series had 4 wheel disc brakes the same year as Jag, I think.

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This also was a factor in the le Mans crash of that year.
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Old 11-15-2012, 02:56 PM   #58 (permalink)
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This also was a factor in the le Mans crash of that year.
Magnesium engine block going through the grandstand like a flaming meteor? Maybe I picked a bad example.

Here's a 115-comment thread on a Subaru forum: Movable rear wing/airbrake

The Chaparal 2e suggests that given the massive torque on an adequate air brake, you're better off to apply downforce directly to the rear axle to improve what brakes you do have. So, no benefit for hypermiling (back on topic).
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Old 11-15-2012, 06:49 PM   #59 (permalink)
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Well My little 98 Escort is pretty slippery compared to the Ranger, i truly believe i could park the ranger on a hill and the Aero drag would keep it there, up in Northern Ct i could go about 75 downhill but they all have 45 speed limits and turns on the bottom, it doesnt pay to coast if i use up the brakes , i was thinking an expert on here would have some ideas, and the roof thing sounds cool, Hey how about an electric trunk lift, Clean out the trunk and slow down all at the same time, I could use some kind of actuator , lots of new cars have em , LOL , quick way to drop your kids off at school . my little escort has high miles so the hypermiling lifestyle fits it and me, i remember my Dad in the sixties driving me places and he was so good you could hardly ever tell when the car was slowing or going faster, guess that's because he didnt like working on the brakes or the engine, and he was a great mechanic, on the slippery side of things, my car is a sedan 4 door , any ideas for the back of the car , how about one of those mid window spoilers like the Merkur had.
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Old 11-15-2012, 08:30 PM   #60 (permalink)
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OK, back off topic.

Do we know if your Escort is a notch or fastback? Unlatch the trunk and drive to the top end and see where the air wants to put it. It sure won't be clear open and it probably won't close, so the angle where it is comfortable will give you a data point.

The air brake on the Mercedes Roadster would open as easily as a parachute but be hard to close, the dive brake on the Dauntless could have to be forced open and close itself, while the plate on the roof of the Mercedes coupe pivots at the center of pressure for the easiest motion, but has additional drag.

If it's a 4-door, just put hydraulic rams on the two back doors.

Quote:
...any ideas for the back of the car...
Yes. Start a new thread.


Last edited by freebeard; 11-15-2012 at 08:31 PM.. Reason: typos
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