[Shop-talk] Coast in Neutral -the next great debate

[DAVID MASSEY]

 You didn't mention what the vehicle is but most manual transmissions have a layshaft that is down in the oil at the bottom transmission.  As long as that layshaft is turning it will be splashing oil and keeping everything lubricated.  That layshaft is driven by the input shaft.  As long as the engine is running (even at idle) the you will get sufficient lubrication regardless whether the driveshaft is turning or not.
Flat towing is a whole other animal.  Typically, the engine is not running in which case the main shaft is turning, driven by the drive shaft, but the layshaft is not.  No splash oiling and the bushings can run dry causing damage.  But if the engine is idling and the clutch is engaged - no worries.
I suspect that the laws regarding coasting in  neutral date back to the 30's when brakes were iffy at best.  In today's world brakes are much more effective and have a level or redundancy built in. My daily driver has a small engine and provides precious little compression braking.  If my brakes were to fail completely (including my hand brake) the engine braking would do very little to prevent a collision.
 
Dave 


 
 
-----Original Message-----
From: eric at megageek.com
To: Shop-talk at autox.team.net
Sent: Mon, Dec 12, 2022 9:15 am
Subject: [Shop-talk] Coast in Neutral -the next great debate

I'm putting this out to the group to getsome opinions from the real experts here.

If you put a manually car or truck inneutral and release the clutch while going down long hills or coming toa stop at a intersection, are you doing any damage?

I'm not worried about fuel savings,just is coasting in neutral with the clutch release.

Any thoughts?

Moose_______________________________________________

Shop-talk at autox.team.net
Donate: http://www.team.net/donate.html
Suggested annual donation  $12.96
Archive: http://www.team.net/pipermail/shop-talk http://autox.team.net/archive

Unsubscribe/Manage: http://autox.team.net/mailman/options/shop-talk/dave1massey@cs.com

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/shop-talk/attachments/20221213/9f342bbe/attachment-0001.htm>