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Cars & Motorcycles
Car Mechanics

Car Mechanics October 2019

Car Mechanics is the UK's only car magazine with essential advice on maintaining and repairing popular makes and models. It’s an invaluable motoring resource that appeals to both the DIY car enthusiast and the more experienced motor trade professional. Car Mechanics has helped save money for our readers every month since 1958. Each issue includes a wide range of in-depth features written in a clear, straightforward manner: • Readers’ motoring-related problems answered for FREE • Real-life motoring dilemmas from our man in the garage trade • Electronic diagnostics delves inside a different modern vehicle each month to explain its management system • Survival Guide looks at new and used component prices for a particular vehicle • Used Car Focus is an in-depth buying guide on a specific make and model • Service Bay covers a full service with close-up images and comprehensive descriptions • Project cars are a major part of the structure of the magazine as we buy, fix and sell different vehicles over a period of months So if you're into saving money and being a home technician, Car Mechanics will help you out - guaranteed!

United Kingdom
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12 Issues

In this issue

1 min.
mot testing equipment changes

▶ Changes are being introduced at MOT testing stations throughout the UK. From October 1, newly-installed roller brake testers will be linked directly to the MOT testing service, sending results via broadband, instead of the MOT tester having to input them by hand on their computer. When an existing MOT testing garage’s rollers wear out or become uneconomical to repair, they will need to be replaced by the new ‘connected’ model, and any test station opening from this date will need to have installed the upgraded equipment in order to be legal. The DVSA is also working with manufacturers to develop other connected test equipment, including: ▶ diesel smoke meters ▶ exhaust gas analysers ▶ decelerometers ▶ headlamp beam testers It is likely that the connected models of these kinds of machines will also become…

1 min.
wrong figures

▶ In Your Letters in the September 2019 issue, John Waldron wrote in to respond to a query we had about hybrid vehicles using solar panels and the figures that John predicted would be gained from fitting them. Unfortunately, we interpreted John’s figures wrongly, so he wrote in again to explain our error. John writes: “ In my email to you (‘Panel Beating’ CM Sept 2019), I notice that my ‘kwhr’ was published as ‘Kw/hr’. Now kwhr is a measure of capacity, while kw/hr is a measure of how many kilowatts are used per hour – not the same thing! As an analogy: a 12-volt lead acid car battery may be sold as having a capacity of 60Ah (ampere hours) – this means it could produce a current of 1 amp…

1 min.
car mechanics

Editor Martyn Knowles Production Editor David Taylor Technical Editor Steve Rothwell Editorial Assistant Leise Enright CONTRIBUTORS > Craig Cheetham > Richard Gunn > Mike Humble > Chris Randall > Ian Cushway > Rob Hawkins > Rob Marshall > Peter Simpson > Andrew Everett > Kim Henson > Jack Moore > Steven Ward ADVERTISING Phone 01733 468864 Group Commercial Director Nicky Holt Commercial Director Kelly Millis Key Accounts Alice Sumner-Andrews Account Manager Kyle Cunningham MARKETING – Phone 01733 468000 Marketing Manager Rachael Beesley Digital Marketing Executive Lewis Plumb Direct Marketing Manager Julie Spires Direct Marketing Executive Amy Dedman Head of Newstrade Marketing Leon Benoiton Newstrade Marketing Manager Joe Deboo PRODUCTION – Phone 01733 468341 Print Production Manager Richard Woolley Advertising Production Zoe Bellamy Printed by Wyndeham Group Distributed by Frontline H BAUER PUBLISHING Managing Director/Consumer Cars Niall Clarkson Editorial Director June Smith-Sheppard Head of Digital Charlie Calton-Watson Finance Director Lisa Hayden Group Finance Director Sarah Vickery…

12 min.
working on exhaust systems

In the early days of motoring, a typical exhaust system was responsible for not only carrying toxic emissions away from the passenger compartment but also reducing the noise caused by the gases escaping the engine at high velocity. “Today, these are not the only functions,” says Doug Bentley, technical head of research and development at Klarius Exhausts of Cheadle, Staffordshire and our technical adviser for this feature. “Aside from influencing engine efficiency, the modern exhaust system is crucial to pollutant control and curtails the emissions of hydrocarbon (HC), nitrous oxides (NOx) and particulates (PM).” The times they are a-changin’ A vehicle’s original exhaust system is designed to complement the engine, enabling it to meet the emissions requirements set by the Euro Standards of Whole Vehicle Type Approval. It also influences performance and fuel…

1 min.
why you should buy a type approved exhaust

▶ Considering their importance to our environment, it’s unsurprising that replacement catalytic converters and DPFs must be Type Approved. This ensures that they perform to the same standards to the car manufacturer’s own replacement parts and have been tested independently. Selling a non-compliant part is illegal. While European countries require the remainder of the exhaust system (ie, the pipes and silencers) to be Type Approved, this is not mandatory in the UK. As fitting a non-Type Approved exhaust can result in a significant reduction in efficiency, with higher emissions, a potential MOT test failure and a shorter life expectancy for not only the exhaust but also the engine and other ancillary parts, Klarius is the only UK aftermarket exhaust manufacturer that has its products certified. Doug explains how this is done:…

1 min.
diesel particulate filters (dpfs)

▶ The function of the DPF is to trap soot particles emitted by the engine and stop them from being expelled into the atmosphere, because they are carcinogenic. We provided a comprehensive overview of how they work in the February 2018 issue of CM. The DPF empties itself by super-heating the soot, causing it to vaporise, leaving a trace of ash behind. This process is called regeneration and it occurs naturally with high exhaust temperatures, such as those resulting from a high-speed run, or by the engine’s fuel injectors initiating a post-injection on the exhaust stroke, which causes diesel fuel to enter the exhaust system, where it combusts, raising the exhaust temperature within the DPF and burning the soot. This process is initiated automatically by the vehicle’s ECU, where a number…