I am currently upgrading to a metal head gasket with the engine in the car, I was thinking it might be worth while to drop in some forged pistons and rods while i have the head off. the motor is a jdm rc motor that had 30,000k on it. what do you guys think about dropping in stock sized forgies? my concern is blowby, but the engine is fairly new... has anyone done this?
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Dropping in forged pistons?
- Thread starter zero06
- Start date
celicast184
Member
dropping forgies are a plus. now one thing you should check before doing so is cylinder bores first! if they are out of round, then itll be best to over bore the cylinders! if they check out within specs, you should be good to go. then determine your ring gaps based on what your planning to do with the motor!
gearhead313
New member
I did the same thing to my JDM motor. I just honed them out and popped them in. Just be sure to de-glaze the cyl walls, not sit there for an hour and resize them! I left the stock rods b/c if you change rods, you should have the crank polished and sized for a new set of bearings. Stock rods hold a fair amount of power, if you retain the stock rev limit.
celicast184
Member
i would check the bores first!!! remember if the bores are egg shaped, rings are not gonna seal well. as far as factory cross hatchings, new rings need to seat well. think of it as a puzzle where the edges fit really well without spacing in between each piece. the rings need to wear to the walls at a microscopic level. the walls now are cut to work with ur old rings, now new rings need to seat to a new wall!
celicast184
Member
also, by changing pistons, it throws off the weight of the rotating assembly. i def would have the assembly balanced again. these are some of the things i would do before dropping forgies as a saftly concern! all the motors i have built had the assembly checked for roundness, honed, and balanced at the very least!