OST-030: a case in point

[oldeskewltoy]

from another forum Wrote:What do you do about bad cam journals and caps?

not ignoring you... not quite ready yet to show that part of the process

from another forum Wrote:Is this a CA customer? 11.3 on 91 octane, better have clean chambers, and management dialed in nicely, my recommendation from experience... I would even worry that improved breathing/VE would skew things even more toward a little less CR. If this is 93 octane, probably it's fine, but potentially close to incipient detonation.

Other side of the country..... Part of the issue is opening the chamber to accommodate the piston. With the clients deck, and the piston volume, the chambers may need to be "opened".


Most pistons can be milled a few ten thousandths, which could drop the piston volume under 3cc

example of piston milling


The piston I designed could be milled .030" and drop the dome volume from 2.5cc to about 1.8cc.