So im starting building my engine....

[TXMazdaSpeeder]

since i have an extra motor out of the mp3 and i read daily of people that actually race there msp's blowing stuff up i decided to build the mp3 motor up to eventually drop in the msp. So far im looking at the basics..

-disassemble block, hone it out. (shouldnt need to be bored any since the motor ran smoothly all its life even though it has approx 76k on it.)
-have the crank balanced and reconditioned
-forged rods and pistons not sure yet if im going to drop the CR, prolly leave it at 9.1:1)
-new bearings and seals
-upgraded oil pump
-baffled oil pan
-good headgasket (havent really done any research on these yet)
-arp bolt kit


the head will be worked over before the motor is ever started on

-3 angle valve job
-deshrouded valves
-ferrea valves
-eibach valve spring kit
-sr motorsports cam gears
-crower custom camshafts
-port and polish
-port match to the intake mani



if anyone sees anything im missing please do tell.

[MrDiggler]

Not for certain on this, but with the forged pistons you may need to have the cylinders bored slightly. Forged pistons are denser and expand enough when hot to need a few thousandths wall clearance. My experience is with monster Pontiac V-8's, so it may or may not apply with our little engines.

[Spooled]

I'm not sure about these engines, but I know that people get them bored to match each piston, too.

[TXMazdaSpeeder]

i meant mostly the engine wouldnt have to be bore to any kind of extreme such as you'd do with say a small block chevy. i wouldnt need to bore it so far as to need oversized pistons.

[TurfBurn]

Read my thread "A Rebuild Story: Forged MP3" as I spell out everything I did to build the motor i haven ow.

[TurfBurn]

It is best to overbore the cylinders by 10 thou so you can have it precision matched with the hone so that your clearances are perfect... a straight hone and drop in of the pistons may lead to too much clearance... or not enough depending on what the factory did or didn't do on your block.