Is warming up essential from cold start?

[blue]

I like turtles 

I like rabbits

[Peters]

Where did air pumping come from?

Simple, engines are essentially air pumps. An air compressor has a cylinder and piston just like a gasoline engine. So, the more air the engine pumps the more exhaust by volume exits the exhaust. More exhaust volume = more emissions.

Next

Although there is no street legal 50cc scooter which can cruise at 50mph, I bet against.
When I cruise with my wifes MP3 LT250 between the trucks on the Autobahn, I need 3-3.5 litre/100km (78-67mpg). Our small car needs at minimum 5-5.5 litre (47-43mpg). As both are fuel injected, running with electronical comtrolled lambda=1, the scooter needs less air.

Given a light enough scooter and light rider it's possible. Mine did 45mph indicated(probably closer to 41-42) with my fat ass on it while it was street legal. Anyway it's besides the point. So we'll go with axy's 40mph for arguments sake.

Next

so what is it yes or no. to worming up in the cold.Does anyone realy know,,,,,,,,,,,,,,,,,,,,,,,,,,,I thing this is the longest post on the fourm.

Yes, yes yes yes yes. Or no. Do whatever you want.

[Peters]

Now my friggin' head hurts.
Operating rpms factor in as well. The whole carbon footprint track is a huge factor. Fuel quality plays a role, as well as oil used for that matter.
HUGE topic!
So to answer the question of warm up... Burn the scoot, and get a skateboard (made of dirt)! Or walk...

"Operating rpms"
That was my major thought. A 50cc scooter will cruise at what 7-8000 rpms at true 40mph? Don't jump on me about that one damn it I'm asking. Where a car will cruise between 1500-2000 rpms(depending on make and model)

[Frank T]

Simple, engines are essentially air pumps. An air compressor has a cylinder and piston just like a gasoline engine. So, the more air the engine pumps the more exhaust by volume exits the exhaust. More exhaust volume = more emissions.



AIR PUMPS
Internal combustion or external combustion or compressed air. They all do the same work.

http://www.popularmechanics.com/cars/news/preview-concept/4217016

[zombie]

It's gone pandemic

[axy]

"Operating rpms"
That was my major thought. A 50cc scooter will cruise at what 7-8000 rpms at true 40mph? Don't jump on me about that one damn it I'm asking. Where a car will cruise between 1500-2000 rpms(depending on make and model)

I would call 1500-2000 rpm "choking the engine", not cruising, for gasoline powered engines.

Most 4-cyl cars cruise (say, 65-70 mph) in top gear at around 3500-4000 rpm.

Even for modern diesel engines it would hardly be possible to cruise comfortably at 1500-2000 rpm because of turbo charger power consumption at such low revs.

[Peters]

bs

An automatic is designed not to choke the engine. So at 40mph a 4 cylinder car will shift to overdrive and ride at 2000 rpm.

You want I should prove you wrong?

Our lovely torquey V8s in American trucks will cruise at 70mph hardly breaking 2000 rpms. You wouldn't know anything about that axy.

[streido]

Automatics are for ladies, old men, and the disabled. 

[ts1]

Automatics are for ladies, old men, and the disabled. 

Ok, I'm an old men. My scooter has automatic.

Some facts:
Mercedes 190E (naturally aspirated R4 2 litre otto) with automatic shifts down to 1200rpm (idling at 750). But rather 40kph than 40mph.
With a V8 down to 900 idling at 600.
Xciting 500 carb is idling at 1200-1400, centrifugal clutch engage between 2000-2500 and happily cruising at >=2500 (i.e. in a 30kph speed restriction zone).
A turbo charger doesn't need additional power, its all in the exhaust gas. But a supercharger would need.

[Peters]

Automatics are for ladies, old men, and the disabled.  

I kinda agree. When it comes to everyday driving or towing though, automatics are the way to go. If you've ever been in very slow moving heavy traffic with a heavy clutch you know what I'm talking about. No good.

[axy]

bs

An automatic is designed not to choke the engine. So at 40mph a 4 cylinder car will shift to overdrive and ride at 2000 rpm.

You want I should prove you wrong?

Our lovely torquey V8s in American trucks will cruise at 70mph hardly breaking 2000 rpms. You wouldn't know anything about that axy.

This is why I mentioned 4-cyl gasoline engine coupled with manual gearbox, prevalent in modern cars, not 12 liter V12 constructed in 1950 with compression ratio 1:6.

I have 1400 cc 109 hp car, gasoline powered, and in 5th gear around 70 mph it`s hovering around 4000 rpm.

[axy]

A turbo charger doesn't need additional power, its all in the exhaust gas. But a supercharger would need.

Try driving any small, and even Audi`s/VW`s 1.9 TDi around 2000 rpm and see the turbo lag between 1500-2500 rpm yourself...

[Peters]

your car sucks

I'm talking about a modern day Ford 302ci(thats 5.0L axy) bone stock will cruise 70 mph at just above 2000 rpm.

[ts1]

Try driving any small, and even Audi`s/VW`s 1.9 TDi around 2000 rpm and see the turbo lag between 1500-2500 rpm yourself...

Then it behaves just like a naturally aspirated engine. I had an Opel Astra 1.7 DTI before, with peak torque from 1800 to 3000rpm. It had no punch below 1500 but still no problems down to 1000.

[axy]

your car sucks

I'm talking about a modern day Ford 302ci(thats 5.0L axy) bone stock will cruise 70 mph at just above 2000 rpm.

What modern day Ford 302ci? 302 engine was in production between 1961 and 2001. If you use some argument, you should at least make sure it is valid.

Ship diesel engines spin at 100-300 rpm, are we supposed to take that as an argument?
600 cc sports bikes go up to 14.000 rpm, are we supposed to evaluate their cruising speed?

It is YOU who mentioned cars` cruising speed, not me, and now you pull out antiquated 5L truck engines?

Do some learning and come back with real arguments next time.

Once again: 4-6 cyl gasoline cars will cruise at 70 mph between 3500 and 4000 rpm, depending on number of gears (5 or 6). Diesel cars will cruise much lower, between 2500 and 2800 rpm.