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Consumer Reviews for the Mazda 3
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2010 Mazda 3 s Grand Touring 4dr Hatchback (2.5L 4cyl 5A)
When I purchased this car I was under the impression that car's would continually be made to last longer and longer as technology improves. Well that does not appear to be the case and this is why it will be difficult to ever let go of my Mazda 3 SGT HB A . I appears many cars these days are built more cheaply than ever and have a planned obsolescence built in where sometime before 100k … major issues arise which cause owners to " just get a new car " . Well thats bunk / because any good car manufacturer has the technology to build cars that can easily last 300k . They often wont , and pack the car full of technological garbage that they sell people on needing instead of using those resources to put better parts in areas of the car that matter, like the engine ...for starters. Self parking , blind spot intervention, etc etc are computers that cost $ , fail at some point , make it more likely something will break and ultimately make people worse drivers by letting them falsely think they dont need to pay attention or learn how to parallel park. Whats really happening is the consumer is paying the auto companies to do R&D on your nickel for the inevitability of self driving cars / anyway- This 2010 Mazda GT was indeed a rare bird that you will likely NEVER see again . Thats why I will never sell it . It was a car that was built to last and was sold right before all the tech stuff you dont need, would have automatically be on ANY car that was at the top of the option spectrum . My GT has leather, Bose , Sunroof , Led Lights and bluetooth ..Which just barely made it into that year . So where did the rest of the $$ to build a $24k car in this class go ? ( and mind you there were many cars $10-20K more that weren't built like this one ) - Alloy rims , yes , Sport suspension, yes and of course all the other handling tech that did improve driving and could be turned off DSC , Abs etc - But heres the kicker that blows the german cars and other 50k cars away - the engine - No not the most hp (167 ) not the best gas mileage 25mpg avg. but the bulletproof components that car makers have all but cut out to save $$ , because after all who keeps a car 300k miles ? ..I DO . Mazda had a well build 2.3 liter 4 cylinder 16 valve dohc that was being used in thier Mazda 3 successfuly for years . in 2010 Mazda had already began work and massive investment into thier skyactive systems which eventually were launched in 2013 . They needed to spruce up the existing Mazda 3 and make it good enough to last until the skyactive line launch in 2013 - So Mazda decided to give it a few nice body tweaks and then address one complaint of 3 owners prior to 2010 -power ! So to save $ they took the existing 2.3 in 2009 , bored to 89mm and stroked up to 100mm making that bad boy into a 2.5 ! pumping out about 17-20 more hp and more torque , but even better - they made it literally indestructible. They took thier aluminum alloy block and forged in 4340 steel molybdenum piston sleeves to reduce friction and deliver high-heat resistance - making this engines cooling fan seldom ever kick on . Since it was bored and stroked they upgraded to a forged steel crankshaft with 8 counterweights. There is a flexible joint between the crankshaft and the flywheel for resonances reduction at the middle and high revs (2,000-5,000 rpm) of the engine. The engine has a cassette type balancer unit as well. It has two balance shafts driven through a gear directly by the crankshaft. Bottom end also received forged powder-metal connecting rods and new aluminum pistons with graphite-coated skirts. !!! god damn !!!! Take that BMW ! The engine has an aluminum alloy cylinder head with four valves per cylinder. On top of the head, there are two overhead camshafts driven by a maintenance-free timing chain equipped with an automatic chain tensioner. The valvetrain has shimless, mechanical bucket tappets (no hydraulic tappets). Intake valve lift is 9.1 mm; exhaust valve lift is 7.8 mm. The 2.5-liter engine is equipped with variable valve timing system for the intake valves only (Mazda's Sequential Valve Timing or S-VT system). Like the 2.3, the 2.5 has a plastic variable length intake manifold. The system name is the Variable Induction System or VIS. The VIS provides long ports layout for low revs and short for high engine revs. Those manipulations increase the pulsing effect of the airflow and draw more air into the cylinder for better efficiency and performance. The 2.5 engine has an electronically controlled sequential, multi-point fuel injection and ignition system with individual direct ignition coils. The exhaust gases go through a stainless steel exhaust manifold/header with a heat-insulating layer and the catalytic converter. Unbelievablely reliable engine for a car that can be bought for under $20 k in the base model ! So the upshot is , that its one of the most trouble free reliable engines built by any car company and rivals the legendary 22re engine that toyota
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