| Re: Interesring article on fluid dynamics and airflow |
Subject: Re: Interesring article on fluid dynamics and airflow by jsup on 2008/11/24 2:48:16 Quote:
I don't think it's unproven. All the major manufacturer's and race teams are using it, and have been for YEARS, it may be a lot of things, but not unproven. You buy a $5000, $10,000 set of heads, you bet they were designed on a wet flow bench. Moving that into the consumer realm is a good thing. The real test is being able to use the high speed camera box under real operational conditions, which I'm looking for information on now. I saw it once, but every engineer I spoke to said their wet dream is to be able to see what happens under operational conditions in the cyl. It exists, I'm just trying to locate the link again. See post 21. Quote:
Yes, Dart promotes it, but they all use it. It's not a Dart specific thing, they are the only ones that advertise it. Brodix uses it, look at their website, as does Edlebrock, I believe TFS, and all the higher end head developers and race teams. If it were Dart specific I'd dismiss it as marketing bullshit. Hell, years ago even AFR bragged about using wet flow, they don't anymore. Quote: I know they had an advertorial going around the publications that showed I think some dart pro 1s and then some platinum 1's that increased the hp by I think around 20 hp, and had around 5 cfm more flow on the intake and 10 more cfm on the exhaust. This test really wasn't all that impressive considering the test engine results..... thats not to say they didn't find some power with it, but the end result wasn't really anything to write home about. I can give a comparison of the exact same engine & cam with 1/2 point less compression and a different cylinder head that didn't utilize wetflow making 20+ more HP .... but it doesn't matter, and I don't want to go there anyway. Which would only prove on that particular combination the other head worked better. GREAT!! And if that 20 HP cost you $700 and you were, like Dan, on a budget, it wouldn't matter. Would I pay $700 for 20 hP? Nope. But that's me. Quote: On cylinder head flow.... so many I don't think understand it. Its treated as an element of a cylinder head by many, but its really not, its a culmination of all the good stuff you did.... in otherwords, its the result of a well designed port, not another element..... cylinder head porters raise or lower the roof, tighten up the throat, clean up the pinch..... all of these things typically increase the flow of the cylinder head, and thats a good thing ! Yes, that's what I said. Wet flow is actually the second best way to design a head, once designed dry flow, as long on the same bench as they vary, is not a bad tool to see what else you can get. But again, once you hit 100% VE it just doesn't matter. It's just not a design tool. That's all. To design on a dry flow bench it's a grind and guess (hack and flow) method. Time and expense to market is greatly extended. On wet flow companies can design a better product faster, cheaper, better. Quote:
Yes, again my point. You can have a head with lower flow numbers still put down more power on the right combination. It's as much about quality of flow as quantity in a vacuum. My point exactly, once a good design is accomplished you can use the measuring stick of dry flow to try to improve it. But to my ultimate point, dry flow in and of itself is not much of an indication of performance as you point out later in this post. Quote: Of course there are other things that make a good cylinder head.... for the serious racers, having a good thick casting that can easily be heavily modified by the serious porting guys. (Dart is one of the best with this).... also having the proper spark plug location, seat, etc..... its all important, but to be honest, all of the aftermarket cylinder head manufacterers figured out the basics a long time ago.... I don't worry about it. Actually, the REAL serious guys I spoke to come down on Brodix for quality of casting and finished product, overwhelmingly. Dart is typically second. BUT Dart happens to have a better website, and my builder said he wanted to use it. He probably made more money on it or something....who knows...6 of one, 1/2 dozen...blah blah blah.... Quote:
I'm not the religious sort, my wife takes the kids to church, but may I say...God Bless You. That's all I ever said. Too many people, if you see the "about 600 club", like to tell you if you don't pick the "right" one of those 10, you're missing out. I think that is bullshit, and that is the kind of mis information this place can live without. Quote:
Ok, funny. It's only my opinion too, I do what I can to support it. |
