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Old 07-05-2014, 02:33 PM   #11 (permalink)
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When the starter motor engages both it and the engine are at zero rpm. Both accelerate together.

When running 50 mph the clutch disc is turning what 2000-3000 rpm and the motor zero. When pulse motoring I am expected to engage once a mile or less. So I have 5-100 of such starts per trip. Once in a while doesn't do much but do an extra 100,000 bumps and see if your clutch likes you. Probably over quadruple of the engagements of slipping the clutch from a normal takeoff, at very mismatched speeds.

When I change gears normally I am doing my best to match the engine speed anticipated to the vehicle speed. Pulsing doesn't allow throttle control to match rpm up as the engine is off.

I would rather buy the fuel than do this.

I am not going to take in the amount hours of running at near zero oil pressure. Say it takes 2-3 seconds for oil pressure to build in all the bearings at a hot start. Mulitiply that by 100,000. 27 hours of engine running without full oil pressure and yet making power.

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Old 07-05-2014, 03:45 PM   #12 (permalink)
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Quote:
Originally Posted by Varn View Post
I think bump starting introduces wear to entire drive train. I would rather replace a starter than a clutch.
Not if I did it, and I don't. It's not completely engaging the clutch, just enough friction to spin the crankshaft around 5 revolutions, or even less, for the engine to start. When perfected practically imperceptible to the passenger.

In a normal acceleration event you are launching a 1.5 ton vehicle from a standstill, and some people have no idea how to do it right. Try it without touching the gas pedal and you will learn friction points and how to drive a clutch so it can last the life of the car.

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Old 07-07-2014, 11:53 AM   #13 (permalink)
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Quote:
Originally Posted by California98Civic View Post
The last 40,000 miles on my car were added using bump starting nearly all the time. I still drive with the original clutch. I did change the transmission, but that was to get taller gearing, not because of any unusual wear. Look up "PaleMelanesian" here on EM and his former car, the palecivic. He drove all bump starting all the time for years in a car with a transmission and clutch virtually identical to yours without any problems. He drives a fit now, but not because of transmission failure.
Thanks for the recognition. Yeah, civic was up to 200,000 miles when I traded it for the Fit, for space reasons. Original clutch. I doubt anyone on this site has done more bump-starts than I have. Well, maybe Metro and maybe Wayne at "that other site", but that's about it.

Lubrication? The engine was just running 30 seconds earlier. Where did the oil film on all the parts go? Did it evaporate? Pour some oil on your hand and wait 30 seconds. You hand will still have oil all over it.
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Old 07-07-2014, 12:50 PM   #14 (permalink)
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I just did a mental rehearsal of my morning commute. 15-18 bump starts over 10 miles, depending on lights. Similar going home. I do this every day. It's the way I drive, when- and wherever I'm driving.
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Old 07-07-2014, 01:13 PM   #15 (permalink)
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I am the original owner of my truck. I have been doing EOC in this truck literally for decades. I just replaced the original clutch at over 200,000 miles. The tranny has never been opened.

If it introduces extra wear, it might just be negligible. I probably could have gone another five years on the clutch except both my kids now know how to drive a stick, and the older one isn't especially keen on it. He cooked it pretty good.
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Old 07-07-2014, 02:58 PM   #16 (permalink)
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I bump start my car twice in the first mile from my house, and in my 21 mile commute I end up bump starting it a couple of dozen times (I'll count tonight). Far as I know it's still the original clutch plate, but I haven't noticed any signs of excess wear yet.
I also key start it back at every light I actually have to stop for, so in that same 21 miles I probably start it from a dead stop 7 or 8 times. My warm engine fires up almost instantly, and I really haven't noticed any warning
signs of aging yet
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Old 07-07-2014, 07:16 PM   #17 (permalink)
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Wow guys thanks for all this info! Keep it coming!
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Old 07-07-2014, 07:21 PM   #18 (permalink)
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Will it matter? Many times long held opinions win over facts.
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Old 07-07-2014, 07:33 PM   #19 (permalink)
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Quote:
Originally Posted by Frank Lee View Post
Will it matter? Many times long held opinions win over facts.
Yea to me it does. This thread put a lot of my own personal worries to rest. My dad can continue to believe what he wants, I'll get the 50+mpg haha. But I do agree with your original statement. I don't think no matter how many people I get to say otherwise he will still believe it causes significant damage.
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Old 07-08-2014, 12:33 AM   #20 (permalink)
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Quote:
Originally Posted by Baltothewolf View Post
..I don't think no matter how many people I get to say otherwise he will still believe it causes significant damage.
There are people who get it and people who don't. Try describing dfco to some and watch their eyes roll back in their head. My wife doesn't see that we only get home like 2 minutes later if I drive a little slower. It just feels like way more time in the car to her but it isn't really much.

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