I was thinking about the long time reliability for G16E-GTS ... considering the power output of 300 HP for just a 1.6L 3 cylinder engine, would this engine be as reliable as all the other Toyota engines?
DO you guys think this will last 250 -300k with proper care and maintenance under regular use and pushing it hard once every other week? Watching YT there are quite few GRY with blown engines due to overrevving issues ... I wonder if there is something we should worry about ...
To make this relatively simple, these small displacement engines today all operate on basically on the same principle. ~10:1 compression ratios with some amount of boost fed in via forced induction. The GrY is around 20psi stock, GrC is going to be around 22-23psi stock. Civic Si ~18psi. Civic Type-R ~23psi. 4-cylinder Supra's BMW engine is ~14psi and Mercedes' M139 fire breather is 30.45psi. The amount of boost and the ability to control detonation/hotspots is really the differentiation as these are still considered general production engines. Stuff like Ferrari and other exotics really start to care if you get a single tank of bad gas or a little amount of buildup which creates hot spots, slightly out of spec valve lift and other issues because they operate on such a fine line. Not so much with these more production motors. While I'm not a fan of "it's a Toyota, it's fine" mentality it's one of those where if you're concerned based upon the power output relative to the number of cylinders or displacement, you've got little to worry about. If the basis of the worry is about over revving or the 38psi eventual failure of the headgasket/stock studs in the 500hp builds, don't worry.. As both of those are not situations aren't real reliability issues unless the plan is to over rev the motor or crank up the boost. Kind of the same 'issue' that occurred with the last gen Celica. Users were blowing the engine because they didn't know how to downshift and VVTi was such a high engagement point (and in part I think redline/fuel cut didn't exactly match, but let's not get into the weeds) so Toyota had to lower the redline.
People also need to understand that 'overbuilt' doesn't mean a whole lot in regards long term reliability. Sure the block has beefy sleeves, but who cares how thick the sleeves are or there's a bottom end girdle if the piston ring lands on the new pistons only survive 5000 heat cycles without deforming? If there's a bearing oiling issue in the design, if the dual injection fuel system is prone to detonation after a certain level of buildup, etc. Basically I don't think anyone is really worried if the power can be made (name one half decent stock engine that can't be pushed for more power), but if that power is reliable and sustainable as wear, deposits and parts starting to move toward spec limits (valve adjustments, injector vaporization efficiency, etc). Ultimately there's really no way to know besides knowing there's GR Yaris' owners who have a 2-3 year head start on you. As anyone who's been in the car field a while knows each engine has its problems, doesn't matter the brand, you just hope they're not something you have to really go out of your way to address.