kingtal0n wrote:The only reason to rebuild a KA is if you personally intend to do it right and THEN personally intend to drive the car in OEM trim for 50-100k miles or more.
Otherwise, grab a random KA, drop it in, and sell the car. The "rebuilt" aspect does NOT add value to the vehicle- in fact it may lessen the value, since most rebuilds are not done right.
The "best way" to do the job "right" (assuming the block is in good enough shape) is to re-use all OEM parts, replace the bearings utilizing the numbers from the block, use updated timing equipment etc... DO NOT send the block to the machine shop and have work done to it, you will pay hundreds and there is very little chance that anything will actually be done right.
When I need an engine worked over by a machine shop, I check everything with the right tools (dial bore gauge the cylinders for the correct piston/wall clearance and roundness etc...) and to be honest it took several tries and several wasted engine blocks to find a shop that can actually do the job the way it is supposed to be done. The factory specifications are VERY strict and very few machine shops have the experience with these high performance 4-cylinder engines to get clearances correct. When I say high performance, I am simply referring to the design and clearances of the parts used- which to me, designates true high performance- the way the engine is assembled and the clearance of the parts chosen, along with the materials that the parts are made out of and the actual size of the parts when warmed up, the tiny space between them must match the designated performance aspect of the engine- the chosen life for the engine. In an engine designated for drag-strip performance ONLY itmay be necessary to be loose with the clearances, but in an engine that expects to life live on the street, this is not acceptable.
"high performance street" means more exact, more fine attention to detail than "all out drag" when it comes to bearing clearances and piston/wall and ring-gap especially. Doesnt matter if its a 120hp KA engine or a 600hp 2jz-gte, street engine means minimal blow-by minimal compression loss minimal end play minimal oil contamination etc...
Meh hit and miss. I prefer having the bottom end assembled by the machine shop after boring, honing, or crank work IE polishing. Motors are forgiving, but proper clearances for oiling, and motion are critical to an engines life and ability to make power. Now as far as blueprinting. its your run out on the motor, your bearing clearances and sizing, micro-polishing specs, ring gaps, torque specs, spring pressures, the specs on the machining, etc, balancing numbers, aline honing reports, yada yada yada. If it me and you say you have a rebuilt or a BUILT motor... I want to see this or as much of it as possible, otherwise it's your word on something you cant see.