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Showing content with the highest reputation on 11/03/2017 in all areas

  1. 2 points
    matt_lamb_160

    crossflow porting results

    I never doubted your combustion chamber comments if that is why my name is in brackets? I just like to see what has been done and works. Haha... "little known fact". This guy must have just learnt it. I am sure the guy is very smart, but that is a bit rich. The air doesn't stop at the port so that is obvious. But he is correct about the pressure thing which is why Vizard recommends the variable pressure flow bench. The influence of exhaust to inlet port has been understood for decades, but perhaps not the finer details which like everything fluid dynamics related may never fully be. The so called rules of inlet to exhaust ratio only apply if you are using the maximum valve space allowable and are still based on some very old experiments from Charles Taylor (despite some claiming it as their own). So the post is right there too. Making an exhaust valve smaller (unless there is something horrible wrong) is not going to make you faster and if your exhaust is flowing at least 60% of your inlet your not giving that much up. But, if it is flowing 90% you are not either unless you have hammered the port in the process. I think that influence of exhaust tunning is often overstated and Sly's post also suggests a hint of that. The very last point made in Sly's post is the main point, why do we test at a constant arbitrary pressure drop? Because it's easy and gives us a good starting point to work with. If you were to design a new head using CFD, you wouldn't do it, but at least it gives you some information to work with. It is a good post with some good points, but he is still talking in black art.
  2. 1 point
    ando76

    crossflow porting results

    100%. And we will just keep doing what we do. When you do a head for a bloke and he puts it on and goes and sets a track lap record at an Aussie title, is the fastest car in qualifying, highest point scorer after all the heats and qualifies on pole for an Aussie title against some of the biggest budgets and best cars in Australia - you must be doing something right. Real results as you say. Oh and he was saying he had the wrong gear set in, but it still pulled through that. Imagine what it would do with the correct gear set. Oh you don't have to. It went to the Qld title and won that feature by the length of the straight after starting in 13th. Another real result. I have no doubt that the Mr Darrin Morgan of Reheer and Morrison knows his stuff as I'm sure he is well paid to do that job and that job alone. Myself and Cam both do what we do as we are interested in the field and when time permits, we play. I'd love to be paid to do this stuff all day, as would cam, but the reality is the amount of people making a proper living from it is minimal. Theories abound and always will.
  3. 1 point
    Mustardxf2

    84DA CROSSFLOW BUILD

    Xg one, but running it east west I believe a standard crossflow one would be long enough since it's the same throttle configuration as the Weber Sent from my Pixel XL using Tapatalk
  4. 1 point
    Mustardxf2

    84DA CROSSFLOW BUILD

    Buy a bracket and find out, I will have to trim mine about half an inch to not stall on the rocker cover, the with 2" apacer. Sent from my Pixel XL using Tapatalk
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