XPost: alt.home.repair
From: xenolith@optusnet.com.au
On 4/3/2022 7:48 pm, Jacob Jones wrote:
> On Fri, 04 Mar 2022 17:19:58 +1100, Xeno wrote:
>
>> On 4/3/2022 9:51 am, Jacob Jones wrote:
>>> On Fri, 04 Mar 2022 09:37:46 +1100, Bob F wrote:
>>>
>>>> On 3/3/2022 12:59 PM, Jacob Jones wrote:
>>>>> On Fri, 04 Mar 2022 07:49:46 +1100, Bob F wrote:
>>>>>
>>>>>> On 3/3/2022 12:03 PM, micky wrote:
>>>>>>> In alt.home.repair, on Thu, 3 Mar 2022 12:47:28 -0600, Paul in
>>>>>>> Houston
>>>>>>> TX wrote:
>>>>>>>
>>>>>>>> micky wrote:
>>>>>>>>> Is red-lining worse, better, or the same when the engine is
>>>>>>>>> driving the
>>>>>>>>> wheels as when the wheels are driving the engine?
>>>>>>>>>
>>>>>>>>> I use the engine to slow down when going down hill, and today, for
>>>>>>>>> example, I put the ATransmission into 2nd and then engine went
>>>>>>>>> briefly
>>>>>>>>> to 5500, the apparent red line. For several seconds was at
>>>>>>>>> 5000 and
>>>>>>>>> even longer at 4500.
>>>>>>>>
>>>>>>>> I did that exiting the freeway in my last Toyota.
>>>>>>>> It sucked a valve into the combustion chamber and broke a piston
>>>>>>>> rod
>>>>>>>> destroying the engine. I gave it away to a needy person who
>>>>>>>> installed a
>>>>>>>> used engine and ended up with a nice car.
>>>>>>> So you're suggesting I shouldn't do it?
>>>>>>> Unless your freeway was going very steeply down hill, I would
>>>>>>> think you
>>>>>>> came close to the redline even less time than I have!!
>>>>>>> This is a 2021 or 2022 Citroen C-3. A rental with only 9000
>>>>>>> miles on
>>>>>>> it, so it must be new. I think I bought the insurance, but
>>>>>>> regardless,
>>>>>>> I don't want to hurt the car. mAYBE I shouldnt go lower than
>>>>>>> 3rd gear
>>>>>>> and rely on the brakes for anything more.
>>>>>>
>>>>>> A motorcycle shop owner heard me downshift to slow as I approached
>>>>>> his lot, and immediately told me that brakes were a lot cheaper to
>>>>>> replace than engine and clutch.
>>>>> Rather a silly comment if you end up crashing because the brakes
>>>>> overheat and you can't stop.
>>>
>>>> He was right.
>>> No he was not when you change down before there will be any red lining.
>>>
>>>> Reving to high speeds to slow down can quickly damage your engine.
>>> But changing down so you don't redline doesnt.
>>>
>>>> That should not be general practice if you care about your vehicle.
>>> That's wrong too. Doing it properly does produce less brake wear.
>>
>> So does driving that saves wear and tear on both brakes and clutch. If
>> a driver has a need to brake hard, either way, maybe it's time to
>> re-learn how to drive.
>
> We aren't talking about braking hard, we are talking how to descend
> steep hills.
No, *we* are talking about using engine braking as opposed to using the
service brakes. You shouldn't be using the engine to slow down on a
hill, that's what the service brakes are for. What you can, and should,
do is use engine braking to maintain a steady speed down a steep hill.
That is the precise scenario where your service brakes can overheat and
that is to be avoided at all costs if brake fade is to be avoided. If
needed, should the vehicle still speed up, an occasional application of
the service brakes is advised but no more than is required to maintain a
steady speed. That way you neither damage your engine or needlessly
overheat the service brakes.
>
>>>> If your brakes fail on a steep hill, OK. But doing that rather than
>>>> keeping your speed below the over-rev point going down hills is just
>>>> stupid. Use your brakes for exiting the freeway, definitely better
>>>> than over-reving.
>>> But perfectly possible to not over rev in that situation.
>>
--
Xeno
Nothing astonishes Noddy so much as common sense and plain dealing.
(with apologies to Ralph Waldo Emerson)
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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