Barry

Apologies, it was not my intention to deliberately insult you. I was merely try to ascertain why you were posting incorrect information about the lubrication of cylinder walls when your profile designation states you are an engineer and an engineer should know these things. If you aren't sure about something, it's better to either ask questions or post nothing than to misinform people with incorrect information. I have never once claimed to be an engineer. I have never taken any engineering exams and I have never had any desire to do so, so a failed or fake engineer I have never been and will never be. I do not even have any technical qualifications as many members on this site know and I have never made a secret of it. I originally left school with qualifications in IT, Business and Languages. However, what I do have is 16+ years experience in all aspects of electrical and mechanical automotive repair, full ground up restoration rebuilds, race car builds and many hundreds of hours reading books and learning theory. Finally, I never enforce my opinion on anyone. If anyone doesn't like my opinion on anything, I don't care. But facts are one thing that should be reiterated over and over as many times as needed until people understand them. Forums are a free education service and it's a shame people don't see it that way or appreciate the fact that people go out of their way to try to teach them.

Just a guess, is it a correlation between post count and likes?

Wrong again. Not every engine uses cylinder liners. In fact, the majority don't. See below the picture of a liner, again you can clearly see the cross hatchings inside. There are 2 compression rings on a piston, the primary and the secondary. They do not hold in 100% of compression efficiently as anyone who has ever done a compression test will tell you. This is why there are 2 compression rings. Because they are not efficient. What happens if you slide 2 pieces of metal together 5000 times a minute without lubricant? They will become extremely hot, wear down or more likely friction weld themselves together. So using basic logic, of course the cylinder wall inside the combustion chamber needs to be lubricated. Are you really an engineer? Because this is very basic fundamental stuff.

I've noticed the new star rating system in the user profile on the left hand side. How does this work and what are the prizes?

Air filter, plugs and pads should be changed on condition, not age. Different people have different driving styles therefore the parts wear differently.

Wrong. If you look inside the cylinder, you will see scores on the wall. These are known as cross hatchings and put there deliberately by the manufacturer or engine builder during the honing process. The purpose of these is to retain a small amount of engine oil above the piston to lubricate the primary and secondary rings. If you don't have this small amount of oil on the cylinder walls, the piston rings can wear out or jam, which is something you see a lot of here through people with no proper training building engines. They stick new pistons and rings in without giving any attention to the cylinder wall. I have seen rebuilt engines fail after a couple of thousand kms and upon strip down, the walls were polished like mirrors. Bore wash is basically what the name says. The bore is washed of its lubricant. This can happen a few ways. I.e. If an injector becomes stuck open through mechanical or electrical fault, the mixture being too rich, or the use of fuel system cleaners. An unlubricated cylinder is bad news.

Hi Sertac. Welcome to Carnity

It's not dangerous as in you will die if you don't change it. However, if the belt breaks, you could end up with a bigger bill, repairing bent valves etc. The belt might break or it might go 200k with no problems, there's no guarantee. Cost should be 1,500 or less. If you change the belt, it is a good selling point. If you don't, the buyer can use it as a bargaining chip.

AMG started making parts for Mercedes way back in the early 70s. However, they weren't official partners until 1990.

Heres one I bet you haven't seen yet, the AMG Galant.

I'm not that impressed to be honest. If everything was shiny clean and silver I might be. Another thing to consider, if it really is capable of cleaning deposits off like that (which I don't believe it is), what do you think is happening inside your engine? If it was really that powerful, it would strip all the lubricant off the cylinders and you would either end up with massive blow by or a siezed engine in no time.

Money spinner for service stations IMO. The fact that it says on the bottle to use it on a mileage as small 4K says it all. They want you to buy loads of it. Garage I used to work in sold it. I gave a few bottles to friends to try as an experiment and had no positive results that would make me want to pay for and put it in my own car. The only real way to clean injectors is to remove them and clean them manually. As for cleaning valves and pistons, you can try terraclean or snowfoam but using plain tap water will have the same results at zero cost. Look on YouTube, there's a few videos on decarbonising your engine with water. There was a thread on here about it a while ago too. If you want your valves to really look like new, you need walnut blasting. I don't know anyone here who does it.

Yeah, what saleem said. I don't know how it would work in underground parking. It's just one of these things you'll have to try and see if the ambient light will run it. A lot of them work through the cigarette lighter so it's a case of plugging it in and setting the panel on the dashboard The simple ones look like this but there are different variations

A bad cheap battery won't damage your electronics but may cause issues and throw up a lot of electrical trouble codes. It won't last as long and could leave you stranded. Rather than disconnecting a battery if you're not going to use the car for a while, I recommend using a battery conditioner instead. They aren't expensive and you can get solar ones if you have no mains power supply. Disconnecting in modern cars can cause all sorts of problems which can lead to a lot of things having to be reprogrammed.

Even this engine ran with a jb weld piston It begs the question, how long before we see 3D printed engines?

I know a lot of guys who swear by this stuff. It's a quick fix and it does work but I'm not into quick fixes. If you're going to fix something, do it right, fix it first time. I am however, pretty impressed by this, although I guess you could obtain a similar result with any temp resistant hard setting epoxy. No patience? Engine starts running at 7:45

I am not an ac expert, I only learned about ac when I came to uae 2 years ago. Cars in my country don't have and don't need it. Surely a bigger and colder condenser would have more benefit than a bigger compressor?

Hard to beat Amaron

I've never had issues getting Pajero parts. At one stage I was looking after maybe 10 different customers with Pajeros. If the parts weren't available, they were by lunch the next day. I've never had issues getting second hand parts either. I know a couple of guys who are very good and will take parts off engines for me. I will agree galant parts are hard to get but that's because hardly anyone drives them and the shops don't feel the need to stock parts. They just want to have fast moving stuff and make a quick buck. I had a VR4 Galant at home. 2.5 v6 twin turbo 4 wheel drive thing. There were only 2 in the whole country and mine was the only one on the road. Try getting parts for that! It ended up in a crusher after I lost patience with it.

Nissan have now rebuilt the Leaf as a hearse. http://thenewswheel.com/the-nissan-leaf-hearse-has-broken-our-brains/

What's a canbus? I have this car in today and I can't find the obd plug anywhere 😜

Some information on it here https://www.gov.uk/government/publications/notice-3-bringing-your-belongings-pets-and-private-motor-vehicles-to-uk-from-outside-the-eu/notice-3-bringing-your-belongings-pets-and-private-motor-vehicles-to-uk-from-outside-the-eu#moving-to-or-returning-to-the-uk-on-tor

It's the volume of displacement between piston tdc and bdc multiplied by the number of engine cylinders. An easier way to explain it would be imagine the amount of water you could pour into a cylinder when the piston is at the bottom. The bigger the ccs, the more fuel/air mix you have available to ignite. Bigger bang means more power. If the total displacement is 2.5 liters, it will be more powerful than a 2.0 (in theory, as long as the fuel/air ratio is the same), it doesn't mean you will burn 2.5 liters of fuel in one stroke. Most of the 2.5 liters will be air.

I was able to set up the suspension on L322s and L405s using the generation before the one I'm using now. Next time you're in Dubai give me a shout and I'll give you a run through it. I guarantee you will be converted.

@desertdude yes, I can do everything you have mentioned in your post. Just recently used it to pulse the secondary air injection on a w12 engine so I could manually find a leak. Currently have a G63 in that had a flat battery and needs a lot of stuff reprogrammed and I have all the same functions as Star, I am an ex Mercedes tech and have used Star extensively. The X 431 I have is the latest model, 3 months old and it is exactly what I said it is. The Chinese got their hands on the genuine dealer software, amalgamated it into their own menus and made it run on android via Bluetooth. Obviously, you need an understanding of how the dealer software works to operate it, some stuff like VW I don't know every function but everything is there. I'll quite happily give you a demo sometime if you want. I started using launch systems a couple of years ago and I wouldn't bother with anything else now. It's a waste of time and money having 12 different computers lying around the shop when one tool will do the job. Aftermarket diagnostic systems have come on a lot, especially in the past 2 years.