Date: Wed, 22 Jul 2009 11:25:16 -0700
Reply-To: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject: Re: Friction
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Essentially no difference.
Like with clutch up in neutral the input shaft of the trans is coasting on a
couple of bearings ......,
so no real difference.
It is never good to hold to clutch pedal in for long periods of time.
The clutch should be pushed in to engage or change gears, then let out.
Or hold it down the last 15 seconds before a light turns green - that sort
of thing.
But sitting at a trafficl light holding the clutch pedal down, in gear or
in neutral .......is rough on things.
Same for coast down a huge hill at 60 mph .........you wouldn't do that with
the clutch pedal pushed in, if you want to be easy on equipment.
I don't worrry about the throw out bearing. In a vanagon it is always
spinning on the pressure plate, even with clutch pedal fully released.
You may have noticed there is always pressure back there at the slave
.........like the slave is always pushing the TOB against the pressure
plate.......
and they don't wear much at all.
I don't like to see the end thrust that occurs on the crankshaft and main
bearings when holding down the clutch.
That end-load is fine for short periods......but not for minutes at a time.
Also .........I don't like keeping pressure in the clutch hydrualics for
long periods of times. Clutch pedals should basically go up and down .....
with minimalized periods of holding the clutch pedal all the way down.
Sure, it doesn't hurt things all 'that much ' ......but if going easy on
equipment, and having it laslt a long time is a goal ..........just more or
less brief periods of holding the pedal down.
It's also a little unsafe holding it down a lot, if the vehcile is in
gear, light at a traffic light.
scott
www.turbovans.com
----- Original Message -----
From: "John Rodgers" <inua@CHARTER.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, July 21, 2009 8:55 PM
Subject: Friction
> This came up today.
>
> if one were to coast, and allow momentum to do the pushing - which
> scenario would have the greatest resistance against rolling.
> 1) Coasting with manual tranny in neutral. clutch released
>
> or,
>
> 2) Coasting with Manual tranny in neutral, clutch pedal depressed.
>
> Curious minds, and all that........
>
> Thanks,
>
> John Rodgers
> 88 GL Driver and proud owner of new Altimax RT's 205/70/R14 XL 98T
> (grin!)
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