Carnut1 wrote: ↑Sun Mar 18, 2018 8:51 pm
Since I started porting in my teens and I am 52 now I am starting to figure a bit out. As far as the flow numbers and port energy, I think it is funny how I have graphed one porters heads who said port energy was b.s. his heads were up near 29 hanging right with Chad's cnc 205's. Today I did a quick rough out of an intake, exhaust and chamber.... 300cfm 211cfm. That was a reserved rough out no polishing the ssr. To bring them to 322cfm 232cfm. I need to do some measuring, flowball action and Pitot airspeeds.
I guess the question is still up in the air on the heads with 29 PE ?
Would they out run a set with 28 PE ? Or a set with 30 PE ?
At some point you'll probably see a high CFM/PE set of heads get beat up on by a set with less, and then the questions really start. LOL
WeingartnerRacing wrote: ↑Mon Mar 19, 2018 9:44 am
Randy is right you need to dyno after awhile you are chasing cfm but the dyno might show nothing or a loss. After you dyno you will have more questions you will need to solve to help your Porting. Also stop comparing your flow numbers to other people’s numbers. Unless that Head was flowed on your bench too those numbers will mean nothing. What if there bench reads high or yours? Then they look different with the port velocity charts you have. Something to think about.
I get it Eric, I am on top of my bench and would expect the pros to be as well. If you don't compare your work to a proven design how do you know you are on the right track if dyno and track times are in the future? I think if Chad was upset with me posting a graph with his work he would let me know. As I have written at this point I cannot get an intake port to flow that much that fast at that port volume. Chad did a great job on those 205cc heads.
Servedio Cylinder Head Development
631-816-4911
9:00am - 9:00pm EST
WeingartnerRacing wrote: ↑Mon Mar 19, 2018 9:44 am
Randy is right you need to dyno after awhile you are chasing cfm but the dyno might show nothing or a loss. After you dyno you will have more questions you will need to solve to help your Porting. Also stop comparing your flow numbers to other people’s numbers. Unless that Head was flowed on your bench too those numbers will mean nothing. What if there bench reads high or yours? Then they look different with the port velocity charts you have. Something to think about.
I get it Eric, I am on top of my bench and would expect the pros to be as well. If you don't compare your work to a proven design how do you know you are on the right track if dyno and track times are in the future? I think if Chad was upset with me posting a graph with his work he would let me know. As I have written at this point I cannot get an intake port to flow that much that fast at that port volume. Chad did a great job on those 205cc heads.
Exactly why I post stuff! If it helps just one person, that is the point. Not about getting work, trying to be smarter, blah blah blah. I can deal with being called an internet porter, internet hero, etc. It's ALL ABOUT HELPING others and passing it on. Good or bad or in between. PERIOD!
Here is a set of those heads on my 380. Nice and crisp and clean!
WeingartnerRacing wrote: ↑Mon Mar 19, 2018 9:44 am
Randy is right you need to dyno after awhile you are chasing cfm but the dyno might show nothing or a loss. After you dyno you will have more questions you will need to solve to help your Porting. Also stop comparing your flow numbers to other people’s numbers. Unless that Head was flowed on your bench too those numbers will mean nothing. What if there bench reads high or yours? Then they look different with the port velocity charts you have. Something to think about.
I get it Eric, I am on top of my bench and would expect the pros to be as well. If you don't compare your work to a proven design how do you know you are on the right track if dyno and track times are in the future? I think if Chad was upset with me posting a graph with his work he would let me know. As I have written at this point I cannot get an intake port to flow that much that fast at that port volume. Chad did a great job on those 205cc heads.
Exactly why I post stuff! If it helps just one person, that is the point. Not about getting work, trying to be smarter, blah blah blah. I can deal with being called an internet porter, internet hero, etc. It's ALL ABOUT HELPING others and passing it on. Good or bad or in between. PERIOD!
Here is a set of those heads on my 380. Nice and crisp and clean!
Not to be a fan boy but Chad, Larry and Eric all post very informative and helpful threads.
D.V. as well but I noticed he is most likely done with ST. Thanks, Charlie
Servedio Cylinder Head Development
631-816-4911
9:00am - 9:00pm EST
I get it Eric, I am on top of my bench and would expect the pros to be as well. If you don't compare your work to a proven design how do you know you are on the right track if dyno and track times are in the future? I think if Chad was upset with me posting a graph with his work he would let me know. As I have written at this point I cannot get an intake port to flow that much that fast at that port volume. Chad did a great job on those 205cc heads.
Exactly why I post stuff! If it helps just one person, that is the point. Not about getting work, trying to be smarter, blah blah blah. I can deal with being called an internet porter, internet hero, etc. It's ALL ABOUT HELPING others and passing it on. Good or bad or in between. PERIOD!
Here is a set of those heads on my 380. Nice and crisp and clean!
Not to be a fan boy but Chad, Larry and Eric all post very informative and helpful threads.
D.V. as well but I noticed he is most likely done with ST. Thanks, Charlie
I totally agree. A few have caught the most grief as well.
