My 05 Elise N/A engine (53K mi) was knocking recently. I took it to my regular mechanic shop in San Diego and was told that piston #1 was slapping - checked everything else still look good: the valves, connecting rods, cams, rockers...etc.
First heard of Piston Slap as I'm not mechanical savvy - researched online and learned a lot. Anyway, I got some new Mahle Pistons, stiffer MWR valve springs and titanium retainers from Monkey Wrench Racing. It is normal for have piston slap on engine at only 53K miles. I maybe redlined it only once or twice for a second or so! Only a few track days and regularly maintained the engine by a qualified shop/mechanic.
The engine is getting a valve job, cleaned and bored and the above new parts will be installed - new again, yeah!
Question: the Mahle pistons is 12.3:1, not same as the stock 11.5:1 - will there be any issue?
Mahle Piston Set - Toyota 2zz - 12.3:1 compression 82mm - MAH-21123820 van Mahle - Monkeywrench
The website advised that the pistons are a direct drop-in to an unmodified 2zz engine. Is it safe and should be ok?
Also as in term of break-in, my mechanic advised that he will put in non-synthetic oil (less slippery) for break-in period of about 1000 miles, and take it easy - basically same as new engine.
Anything else (different) I should or should not do during the break-in period for our high compression N/A 2zz engine? I've researched online about breaking it new pistons and engine. Thank you very much in advance for any advice/suggestions, folks.
I'm actually excited bout getting the "re-new" engine!