jamie wrote:I cleaned my tumbled parts again in a solution of dry acid salts. This removes any flash rust which may have developed on the parts since they came out of the tumbler.
Anyway... I just received this photo from engine dude...
For reasons that we could only conclude are the past result of something metal going through cylinder 1, my heads' combustion chambers had been re-profiled somewhat from original. If you look back a few pages, there are some photos, and you will notice that whoever did it must have used a pickaxe. Dude measured a difference of 6cc between the four chambers, with no.1 being the worst.
The Dude has polished the axe-marks out and now we are left with this thing of beauty. The CC of the chambers has been calculated using a silicone mould (I listened, understood the principle of this, but couldn't visualise the practice), and as you can see, they are now within 0.2cc, or 0.26%, of each other. I'm delighted. Dude isn't 100% happy since Captain Pickaxe didn't leave enough metal in there for him to carve the signature secret chamber profile he uses on his drag engines, but he's going to try get as close as he can. The surface of the chamber will then be made un-shiny again.
The plan from here is to have the heads fitted with bigger inlet valves.
