Quote:
Originally Posted by Logic
Also of note here is that those valves are far from stock if my eyes aren't deceiving me:
The valve edges have been rounded = gas flowed?
Also the valve face has been hollowed out a bit? Using a lathe by the (conical) look of it?
If so; you might try fabricating a lathe attachment for a small angle grinder pgfpro:
If this is a valve in the lathe chuck: |----
You set the angle grinder up to come in at an oblique angle = to the 'dishing' you want, to do to get that perfect hemispherical combustion chamber. 
Something like this: /|---- but with that '/ ' bit of grinder blade at the center of the valve.
I hope my 'graphics' get the idea across?
(Then you finish by hand, with sandpaper everyone)
What I don't get:
Unless that pre-chamber has it's own fuel injector; howTH do you get a rich charge into it, through that tiny little nozzle hole? |
Great ideas on the valve cut. This head is the highly modified race head to achieve 1400HP. It has over size valves in it that have been flowed on a flow bench. We call it the 7/70 engine, meaning run 7 second 1/4 mile ET and also be able to get 70 mpg.
Like all my pre-chambers it's a Passive Pre-Chamber. So, it has a disadvantage of max lean burn due to feeding the pre-chamber. This is also the V3 version. The V4 version pre-chamber has been changed to add better flow of fuel to feed the pre chamber "not shown". The V4 version uses a technique that you found a posted in one of your videos. Thank you again for the video.
How both version work is on max mpg mode it runs with a single intake valve opening point and a single valve exhaust opening point with mpg cams and adjustable valve timing. In short it has one exhaust valve is delayed and one intake valve advanced to produce a cross flow towards center of the pre-chamber. The piston is sprayed guided along with the injector and intake port, put all this action together and it feeds the pre-chamber on the intake stroke. Then on the compression stroke the piston shape also due to its design centers advancing pressure to the center where the piston collection area below the pre chamber gets and keeps the fuel in the piston pocket. The factory piston oil coolers have been modified to cool the bottom of the pistons at center and on top the pre chamber is cooled by _________ and _______ for fuel captured cooling. Now an active pre chamber would eliminate all this fuss but the machining and cost goes up a ton, so I'm stuck with a passive type pre chamber. lol