Project Fredybender V2.1 : NA with an attitude for the track by fredybender

3 minute(s) of a 234 minute read

I came home tonight, and started final assembly of the engine...SNAFU

I was listening to some tunes, while taking my time, and assembling very nice new and machined components. I put the rings on the pistons, carefully installed the rod bearings, torque the main crank caps with new bearings, installed the new pistons in the bores, lined everything up made my own head gasket thickness, and machined some locating pins for the head & block.

All was great, the crank would turn freely, as smooth as peanut butter...

Torqued the head down, and crank wouldn't move any more... 

Good thing I got ARP studs, this time, because I would have gone through at least 3 set of head bolts tonight, not including the rod bolts that I need to undo...

I have interference at the squish line between piston & head, I would rate it at about .002"

I will be taking out my pistons, machining them, and re-doing all my CC calculations for both head & pistons. I didn't come this far, just to have an engine that will fail...

A few pics...

12-2-10

I took the engine apart again; I got that the squish band interferes with piston travel, so I decided to do something about it. Got my courage together, and put them in my 4 jaw chuck to machine my new Wossner pistons...I would say that the first piston must have taken me an hour and a half, to get it within a couple of tenths (i.e.: 0.0001") on the indicator, on run out and flatness.

I then machined them down with the same angle, but taking off about 0.043" on the diameter, at 45 degrees.

I then re-installed my pistons, to take the CC readings once more, to keep my dynamic compression ratio, to the value I require... (This equates to 220psi)

Calculations to be done tomorrow, to compensate head gasket thickness once again.