I drive a 2002 land rover that is all wheel drive and also has 4 wheel drive. Is the 4th gear my 4 wheel drive? I also don‘t understand the difference between all wheel and 4 wheel drive.
All wheel drive is for any road condition,enhanced traction. 4 wheel is for slippery surfaces or snow only ,the steering is compromised in slow turning so like for deep snow, snow covered road or slippery ice or muudy situations. all wheel does well on everything but compromises gas mileage and wears tires more rapidly.(if you have two wheel option use that for normal driving) so its ok for rain and snow , but not really treacherous stuff.All wheel all the time , 4 wheel 4 really bad stuff.
In my humble opinion copper. It costs a small fortune though. Copper is a natural anti - bacterial. PVC is plastic. You can't get away from that. All plastics will leach a little plastisizer into their surroundings, water or air. Also, you don't want to be anywhere near the smoke from PVC when it burns.
I just started driving stick shift myself. My truck is a 86 so it might be different. But 4th gear is definitely not 4 wheel drive. On my truck you have to go do something to the tires to get it into 4 wheel drive.
No, 4th gear isn't the same as 4 wheel drive. All wheel drive is all wheels being controlled by the engine all of the time. 4wd drive is all wheels being turned by the engine part of the time (can be turned on and off.) 4wd will usually have some kind of switch for off, 4 high and 4 low.
as a plumber i prefer to use copper tube for drinking and bathing water as copper is a natural anti bacterial substance. however, i often use plastic on heating systems as the stuff comes in 50 meter coils (less joints to install) and is more resistant to sludge build up. the heating system must be high pressure though as plastic pipework is obviously very flexible and on a gravity system air locks are a risk even when clipped in place at the right tollerances. allthough less joints are used and it is generally quicker to install plastic pipe, the fittings needed to install it are generally twice the price of copper fittings. what i always do is explain all this to the customer and leave the decission to them. generally the older they are the more likeley they will avoid plastic and opt for copper. youwould not believe that i started using plastic tube 40 years ago and some people still dont like the idea of it. all new houses built now have the whole lot in plastic. however , the customer has the final word as long as what you fit is done legally,for example, if a gas pipe was found to be fitted using plastic, that would be a very,very, serious breach of regulations and could lead to jail and unlimited fines. hope this helps.
