OST-019: Collaboration

[oldeskewltoy]

oldeskewltoy Wrote:So the head will likely be @ the shop for closer to 2 weeks so the parts can arrive from Toyota's Cincinnati depot

Another soap opera...... LOOOONG story short... Supertech guides on the intake, and OEM O/S guides for the exhaust. Oh... and it is about 2 weeks :thumbsdown:


Well, with the head back here, the last bit of work is now in order. The head has large crescent shaped machining marks left over in the head from production. These machining marks will be smoothed out into the surrounding area of the chamber. This will remove a sharp edged protrusion in the chamber, allowing the chamber to support more compression without pre-ignition.



Also note the 3 angle valve job.... On the 4AGE, there are different angles for intake and exhaust.... and they can be seen in this view



I had the head cut .015" estimating the amount of material I'll be removing to de-shroud the chambers. I set up the burette



I measured all the chambers, their volume ranges between 34.7cc, and 34.8cc. The chamber below is the one measuring 34.7cc.



I use the bottom of the meniscus for my measurement.


So, that "gives" me 1.2 to 1.3cc of volume I can add to these chambers volume (to get them back to stock 36cc) while removing the machining marks.



More to come......

[oldeskewltoy]

oldeskewltoy Wrote:So, that "gives" me 1.2 to 1.3cc of volume I can add to these chambers volume (to get them back to stock 36cc) while removing the machining marks.

Chamber #3... The chambers are now de-shrouded, and chamber volume is back up to 36cc.... same as stock




The above chamber can now(bottom panel) withstand considerably more compression without pre-ignition, then it could when I started(top panel)

[BOOMEX]