David Vizard wrote:Frankshaft wrote:Since the cat is out of the bag, there will be documented proof that its my saying, lol, I call that a reverse turtle.
Seems to me that some posters are a little ticked off about my naming of port energy and specific port energy and it has been said these just don’t describe anything of consequence and it is just a name.
Sorry guys I absolutely have to disagree. No-one counters the naming of the quantity of air flowed as CFm why because it is exactly that – CFM. Nor do they argue that velocity is accurately depicted by the term Ft/Sec. Like it or not port Port Energy is just that – Port energy as is Specific Port energy. The name exactly describes the property.
Give these terms to say, a mathematician, and they would immediately understand what proporty was being described even if the application was not know but ‘Reverse Turtles’? When I write my tech stuff I believe that the naming of anything has to have a real world relevance at least suggesting it’s function. So you feel that your naming of the port and plenum floor treatment should be down to you since you have been doing it for years – and that is since - when. With tongue in cheek here is what Roger named it back in the 1985 ish era.
Active Formation of Turbulent Energy to Resist Fuel Aligning Streaming To Ports Over Two Rough Surfaces. That’s a mouthful so we used the acronym of ‘AFTERFASTPORTS’ which exactly described what the goal was.
Yes, reverse Turtle. I am sure you have seen a turtle. The are above the surface, what I do is below the surface, hence the name, reverse turtle. That's what I call it. Its mostly a gimic. Much like sanding a diamond or a circle on the floor. However, if fuel puddled, it could possibly do something. I have done it back to back, added it to good running intakes after, and there is zero measurable difference. For the record, I wasn't referring to you copying that floor treatment and getting the credit for it.
As far as port energy, you can call it whatever you want. That's fine. Its not a necessary "measurement" or one of the many port dynamics that exist. Someone that understand port "dynamics" knows that. Porting cylinder heads isn't about grinding, sticking it on the flow bench, flowing it, grinding more, sticking it back on there to see if it flows more. Its simply about sizing the port for the given application, creating complimenting areas within the runner, and then tuning the velocity profile to compliment the application. Its different for every application. maximizing what you refer to as port energy, will in most cases create a port that is to fast. One of the most misunderstood "dynamics" in cylinder head porting is velocity. Its not the most velocity you can create, but the correct velocity for the given application, that's the trick, knowing what you need. So, respectfully, I am not a follower of port energy. Sorry. I would blow most peoples minds on here, what I have made for power with every application under the sun. The kicker, at least half or more of the time, the heads NEVER went on a flow bench. One time, I hand ported a set of Indy 600-13x cnc castings from scratch, for a local dyno shop friend of mine, to replace a set of cracked and burnt up castings that BES did originally. My heads made 30 more hp on the same short block, vs BES's cnc'd set. The heads never went on a flow bench. I have a Saenz S-600 for the record, its my 3rd flow bench I have owned over the years. This usually bugs people, when I say this, but, a flow bench is an intermediate learning tool. I know its not, but I make that joke all the time. That quote was actually from Billy Glidden. I have picked up no less than 20 sets of AFR whatever. Fill in the blanks. BBC 357's, sbc 195,s,210's, 220's, 227's, 235's, etc etc, HUGE. Not even kidding. Usually to the tune of 40-60 hp. Why, because they have killer port energy. Reducing it makes WAY more power. Its not even about flow. Recently I re ported a set of RHS 200 heads I did for a 331 sbc road race engine. They were originally ported and had I would bet good port energy. Small port, fairly high flowing port. He built a new 377 short block, redynoed, and it quit a bit early. Re ported the heads for the new application, mainly to adjust the velocity profile, it gained minimal cfm, but made 35 more hp. The port energy as described was lower, but it made 35 more hp. I could go on and on with this stuff. Might not be able to articulate as well, with fancy graphs and the like, but I promise you, I know how to make real power, as well as anyone, and better than most.