I am refering to cylinder heads fyi, but ive heard that massive's ult. head flows more than the FR head but doesnt have the same velocity. how does this equate to engine performance?
mass transfer in general depends on both velocity and cross sectional area ( a head with more volume will have a greater cross sectional area through the ports).we were taught that the key to making power is air speed. Higher air speed atomizes fuel better, and fills the cylinder quicker, which means for a given duration more air can be put in.
i see what you mean about where they are taking the measurements. i bet they would be a good deal diff. if they measured in a diff. location.Higher velocity would mean that with a longer duration cam you should be able to match the higher flow of a slower velocity head.
Also velocity has to do with low RPM drive-ability. Generally a higher velocity will yield better low RPM combustion and in turn better low RPM response/TQ.
Least far as I understand.
i see, kinda like a 4-2-1 header (svt for instance) will make more low end torque, and a 4-1 header will flow better up top.
Now the part that sucks is you have no clue where in the port they are measuring the velocity or if the two are measuring at the same point. Velocity can change quite a bit from one wall to the next or one side of the valve to the next. One would hope that the flow is close to laminar around the valve but you really have no clue.
Riiiight. Nothing to back up our claims. Except... Flow bench data. On a well calibrated SuperFlow.There is NOTHING that supports massive "claim" to have the best flowing head because they dont I do , but for the time it takes to do this head its to big for most and cost to much for the rest so with HRS and HRS on my flow bench and on my dyno testing what a GOOD flowing head does after you bolt on the intake manifold , TB , header and everything else to see you flow numbers go down down down it just isnt worth it vs the FR head
Out of everyone that sells ported heads none have a flow bench to spend the time needed , none have a dyno that once the flow bench work is done go to the dyno to see if it even helps then back to the flow bench ,non have posted any numbers with the intake and TB bolted on there ported head vs stock or the FR , I have , so they can claim what they want , I have the tools and I know what it take , Go with the FR Head , best bang for the buck hands down
A good flowing head has NOTHING to do with how well the flow bench is calibrated , your right all you have to back anything up is the flow bench data , and thats all you ever will have , because you head wont out do the FR head , if you knew anything at all about head flowing you would know that bynow , you send your heads off and have them ported and flowed then you "claim" to have the best head , it takes a lot more then flow numbers and I have you beat there by about 20% , I have the best flowing head for the Focus and have backed it up with making 700HP , How have you backed up yours ?Riiiight. Nothing to back up our claims. Except... Flow bench data. On a well calibrated SuperFlow.
My data to suport my claims comes from making HP something you guys have yet been able to do , in the end thats why we do all this work and add heads , intakes , turbos isnt it ? Your flow numbers are just that numbers you use as well as other Co to sucker customers into buying your head over other headsAnd your head that is the "best" but you've yet to produce any data. And from the pics, theres no freakin way. And you constantly promote the FR head - why? Wouldnt YOU want to sell yours? And if your such a pro with your HRS and HRS on the flow bench you'd know the FR head has very minimal work.
Because flow numbers are for bragging rights and have little to do with what HP/TQ they put out , I have seen time and time again a WELL flowing head not make any better HP , been there done that , so why give numbers if in the end they cant make the % better in flow equal to gains in HPTom,
If your going to continually harp on other shops about their heads, maybe you should link to your flow numbers (which btw I've looked for for quite some time and never found). All I can ever find are dyno's, and few at best.
There are a few others I'm forgetting simply because I don't have enough time at the moment.
A good flowing head has NOTHING to do with how well the flow bench is calibrated
I have the best flowing head for the Focus and have backed it up with making 700HP
Flow numbers are for comparing a stock head to what you just ported NOTHING MORE , more flow does not mean more HP , bigger isn't always better.