Remote Start

Matt82 said:
what car is that the owners manual for?
Click to expand...

honda civic 2001

A cold engine uses more fuel than a
warm engine. It is not necessary to
‘‘warm-up’’ a cold engine by letting it
idle for a long time. You can drive
away in about a minute, no matter
how cold it is outside. The engine
will warm up faster, and you get
better fuel economy. To cut down on
the number of ‘‘cold starts,’’ try to
combine several short trips into one.
Click to expand...

no mention of it being bad for the engine.. no mention of wear and tear. Only bad thing according to Honda is poor fuel economy..

page 168 of the honda manual if you have any further queries.
 
Jonnycoupe said:
Prove it?

The cam bearings loads from the snout of the cam pushing the valvle allows spring load to build up at low rpm as you dont have the inertia of the cam collet carrying the tappet away from the cam surface at lift ramp.

For this reason running in new cams requires a high idle (2500rpm) period of around 30 mines.

The internal combustion engine is a mess of spinning and reciprocating engine. There is no load site that can be considered 'low load' as a generic statement.
Click to expand...

Engine load at idle may well be less at a higher idle speed than it is at a lower idle speed.

BUT

Both are significantly lower than engine load under use.
 
Gav said:
honda civic 2001



no mention of it being bad for the engine.. no mention of wear and tear. Only bad thing according to Honda is poor fuel economy..

page 168 of the honda manual if you have any further queries.
Click to expand...

so it uses extra fuel, no extra air will be supplied... unburnt fuel, leading to the issues i listed earlier
 
Here's the truth of the matter.

Yes, leaving your car to run at idle is bad, but only for fuel economy's sake. You will be placing a larger wear rate on the cam bearings but it's questionable you would ever notice this.

No, your water will not be circulating fully until the throttle is opened and/or the thermostat reaches the required temperature to open.

There will be minimal difference, if any, in engine wear based on oil friction in a modern engine with modern oil technology.

As far as heating the car goes, to sit it at idle and have the heater blowing will take longer to warm the car up than just getting in it and driving. Your heater matrix requires airflow around the engine bay to push the warmed air into the cabin. By sitting with your engine running and the heater on all you are doing is pulling in the air from the engine which in turn takes the engine a lot longer to actually warm up. Just get driving, in a sensible fashion, ideally with the heater off until the car is up to a suitable temp.

Simple.
 
Lucero said:
Here's the truth of the matter.

Yes, leaving your car to run at idle is bad, but only for fuel economy's sake. You will be placing a larger wear rate on the cam bearings but it's questionable you would ever notice this.

No, your water will not be circulating fully until the throttle is opened and/or the thermostat reaches the required temperature to open.

There will be minimal difference, if any, in engine wear based on oil friction in a modern engine with modern oil technology.

As far as heating the car goes, to sit it at idle and have the heater blowing will take longer to warm the car up than just getting in it and driving. Your heater matrix requires airflow around the engine bay to push the warmed air into the cabin. By sitting with your engine running and the heater on all you are doing is pulling in the air from the engine which in turn takes the engine a lot longer to actually warm up. Just get driving, in a sensible fashion, ideally with the heater off until the car is up to a suitable temp.

Simple.
Click to expand...

Your heater draws air in from the engine bay? Really? Mine draws it in from behind the top of the firewall, in front of the windscreen (so there is a sheet of metal between the engine bay and the pollen filter). It sucks air in from the windscreen, pretty much. The Alfa did similar from what I can recall. I'm pretty sure the BMW systems dont suck in engine bay air either...

Driving along actually pushes cold air into the engine bay (albeit slightly warmed by the radiator) so idling would allow the air in there to get much hotter regardless of the cabin heater settings.
 
I saw an old Cavalier driving around with foil over the grill the other day. Would this warm up the car quicker at idle or while moving? :)
 
Lucero said:
Here's the truth of the matter.

Yes, leaving your car to run at idle is bad, but only for fuel economy's sake. You will be placing a larger wear rate on the cam bearings but it's questionable you would ever notice this.

No, your water will not be circulating fully until the throttle is opened and/or the thermostat reaches the required temperature to open.

There will be minimal difference, if any, in engine wear based on oil friction in a modern engine with modern oil technology.

As far as heating the car goes, to sit it at idle and have the heater blowing will take longer to warm the car up than just getting in it and driving. Your heater matrix requires airflow around the engine bay to push the warmed air into the cabin. By sitting with your engine running and the heater on all you are doing is pulling in the air from the engine which in turn takes the engine a lot longer to actually warm up. Just get driving, in a sensible fashion, ideally with the heater off until the car is up to a suitable temp.

Simple.
Click to expand...

Er.. No. The heat from the heater matrix is generated by the coolant flowing through it. It's pushed into the cabin by the fans. If the engine isn't warm, you won't get any hot air. If your car is sitting idling for 10 minutes, it won't be nearly as warm as it would if you've been driving it for 10 minutes.
 
I had remote start on my old Civic Vti. It resulted in one of the most horribly uncomfortable moments of my life.

Fantastically useful bit of kit, but there's a lot of scope for things to go wrong!
 
BMW EfficientDynamics cars (dunno whether it's some, or all) have mechanical louvers in the radiator grille that open and close to restrict airflow and help it get up to operating temperature faster, don't they?
 
Howard said:
Er.. No. The heat from the heater matrix is generated by the coolant flowing through it. It's pushed into the cabin by the fans. If the engine isn't warm, you won't get any hot air. If your car is sitting idling for 10 minutes, it won't be nearly as warm as it would if you've been driving it for 10 minutes.
Click to expand...

Not all cars do that, my mates old vectra V6 used the exhaust for the heaters. Was hot within 20 seconds.
 
Gav said:
Engine load at idle may well be less at a higher idle speed than it is at a lower idle speed.

BUT

Both are significantly lower than engine load under use.
Click to expand...

Define "load". In terms of the load on the cam nose this simply isn't true, the load at idle is higher than it is at higher RPM and more importantly it's sustained for longer which gives more chance of the oil film breaking down. As JC has already mentioned, a new cam must be run well above idle to avoid premature failure, why do you think this is?

An idling engine doesn't warm up very quickly, so all the wear conditions that are associated with a cold engine are maintained for longer e.g. low oil flow, rich mixtures causing bore wash coupled with larger piston/bore clearances giving increased blowby and oil dilution etc.
 
You must log in or register to reply here.
Back
Top Bottom