i thought that polishing heads was bad for fuel atomization? causes it to almost condensate in the runners and lead to drips???
Sonny, that probably is the case for carb’d/TBI/TPI motors? I was under the impression that smoothing and increasing the intake air charge could improve numbers in a MPFI application though. The injector makes the atomization very close to the intake valve in that case?
that is some what correct,u can over do them
im just wanting to see numbers, and i just didnt agree with the comment sayin flowbench is a waste of money…if he konws what hes doing, they why did he put holes in the head? these heads are not normal small block chevy heads, u can over port these heads and not see good gains at all. seat of the pants dyno is not that great of a way to say how well something performs.
sad thing is that i agree with this kid. hopefully we see some good gains… :idb:
doing port work to a had is something that not everyone can do. If ur going to do the work atleast have the numbers to back up ur work. U know its jsut like buying a car. Ur not going to go and buy it unless u have good research telling that this product is a good buy.
i pocket ported the first set of heads on my camaro when i was like 20 and put a hole in one of the chambers that leads up too the valva cover screw so i put them on anyway and they ran fine but the heads were cracked anyway and overheated so no loss but porting is not a simple task and i could only imagine is a lsx
they will come, they will come… with the holiday, the guy that was working on my car was off for a while, and things have gotten a little off schedule… Still dont have teh car back, but do expect it next week… and hopefully they stick to that schedule…
when mine was in the body shop after i got rear ended, 3 times they told me it was going to be done a certain time and it was pushed back further, i hate that crap
Alright. I’m not sure how well versed all you guys are in head porting or if you read into current debate much. There are inevitable areas that will cause a net loss of performance. Over porting is a factual thing. The idea of having a smooth finish on the runner is much debated. The idea of a rough surface on the ports it to premote a boundry layer of air that isn’t moving. Not a bad idea in theory. Now if you take a maganifying glass to so called polished ports there are still going to be alot a surface abrasions that will create a boundry layer. The injector is aimed at the back side of the intake valve spraying atomized fuel at 50psi. You are not going to have fuel dropout. The holes in the runners probably doesn’t need addressed unless you have absolutely no research in lsx heads. There was a cast in lump in the top of the runner where the base of the rocker stud bolts in. Removing this bump gets rid of a major turbulance generator right in front of the long side turn. The only draw back is that you have to remember to put RTV on the rocker stud so you don’t have a vaccume leak. CFM is a very widely debated number as well. Some professional head porters will not give their customers a chart. It is often information that the customer relies way to much on to relize if actual gains are made. For me to know the flow numbers is benificial, for the general public to make assumptions on how the head will perform dynamically based on flow bench cfm leads to paralization by analization.
Anyhow, vindication of the work is coming. I am not trying to hide any actual gains. Soo with your patients you will see the fruits of our labor.
:golfclap:
I need the Beretta heads ported. ASAP.
intense racing in ohio is a good place to get v6 heads ported. Also ZZperformance.
I’ve been gone for a long time, but last time i knew, you werent allowed to support non-Pittspeed sponsors in threads… :nono:
another inportant factor is not just how much cfm there is but the velocity of the air going in to because that is just as important…and by the way i checked out some graphs and my little k-series 4 banger flows about 300cfm stock lol
as much as i like jay, God is going to smite you for not sending them to Ben.
heh, i was just jokin for the time being… i wouldnt waste my money on the 3100, but if we jam a 3400 in there i’m probably gonna look into it.
do we are saying getting the heads flow benched soo you can make sure all the runners are flowing the same, who wnats a runner to flow 250 and the next to flow 290? i just dont agree with getting hand ported heads and not testing the flow of them
Comparative numbers between runners are good, but I agree with Jay that trying to compare flow bench numbers between porters on different flow benches can be misleading.
yes comparing between different porters on different benchs is misleading but those are 9/10 times those heads aer cnc which means each runner is the same. but when u port heads by head u want to make sure they all flow the same
I know they are all the same. I did them by hand. It took a shit load of time to make certain they are identical.
By the way, CCing runners > CFM for comparative purposes 