SCTrailrider, thanks for you and Unique diesel taking the time and $ to try this stuff out, innovation costs money, and the effort is much appreciated. most of it is above my knowledge level though, so some of this I cant even understand.
For the un-educated, what will this do? You mentioned it should improve low end grunt, which I am very interested in. Will it also drop EGTs and IATs? will it smoke less due to a cleaner burn?
Also from an un-educated standpoint, I dont see the big issue that FT sees with the pre-cup, as all that has to do with is the injection system, not the valves, free-er flowing air would surely swirl more and try to encourage better combustion in the IDI system, would it not?
I don't know a good way to explane it.....
I have made silicone molds of the runners so it is easy to hold the runner in your hands and measure in places it's hard to get to in the head. The exhaust runner in stock form are tiny, much smaller than the manifolds are..
The only way I can think to show the restriction is a air hose, bend it and flow slows and psi builds, use a larger hose and remove the bend and more air will flow with less psi....???
We should have the next set of numbers this week, a head is on it's way to TX now, this will the 2nd test on the same head, nothing done but port work... then once it gets back to me it will be ceramic coated with heat stop in all the runners then sent back to TX. It then will get flowed again to show anything gained or lost in the coating process, then the same shop will do the valve work, different springs, unshrouding the chambers etc, then they will get a final flow test once done for final numbers.
I don't know how to describe the benefits of opening up the runners, I know I hear lots of talk in the race/performance motor field both gas & diesel's... but I won't attempt to talk anyone into it either.. all we are doing is attempting to find untapped power for ourself and show the good or bad with it...
I do know a forced induction motor likes big holes to flow the big amounts of air being pushed through them, if smaller holes worked then the big cube motors wouldn't spend so much getting the heads to flow more air...
Why would the lowly 6.x be any different, we add bigger turbo's, bigger exhaust, bigger IP's, bigger injectors, etc... what about the inside of the motor, would better flow not be a positive thing also???
Like I stated at the beginning of the thread, this isn't a area many will look at, most aren't looking for anything other than a bolt on power getter... most will see the numbers and not really understand what they see... that's OK, it's not a quick cheap addition to a build in most eyes anyway...
Edit... as for the cam... the p400 does have a billet cam, the cam is on the way to TX also, they have a "cam doctor" that will give all the specs for any cam... but I won't be making the specs public anytime soon, that's part of the R&D that cost, and I couldn't build any motor without knowing about the cam... if they didn't make changes to the cam they wouldn't have needed a new blank me thinks...
