new manifold design design

[turbovanman]

Quote:

Originally Posted by 90Shadow If I dont do my 16v conversion, I will buy one outright from you! Those manifolds look great! Nice work!

He does the 16v conversions also,

[DirectConnection]

Quote:

Originally Posted by Garret Well with all this secret handshake crap that goes on with people and porting heads. Why not try it in a boosted application IMHO flowbench numbers don't really mean a whole lot because that's what it flows under vacuum so who knows how flow patterns change under pressure? So I don't know about you but I am going to try the head I am doing with the exhaust ports hogged out as far as they will go and I'll see what happens

The flowbench doesn't operate in vacuum when testing the exhaust. You are correct that a flowbench isn't the final word in how well the head will operate. Just simply reading cfm #s isn't enough, but the truly experienced head porters will tell you that the flowbech is indeed critical. This is because they really understand how airflow works and can decipher the #s. meaning, there's alot more to the cfm results than just meets the eye (like how turbulent it is, or the velocities, or the flowpattern, swirl, tumble, the cfm throughout the lift range tells a *HUGE* story as to what is going on, etc). This is were a line is drawn between your average headporter and someone who is above and beyond all others.... like Steve Menegan's mentors he had and now maybe even including himself. You will *NOT* find one engine builder in the professional ranks that ports his heads without the use of flowbench data and verification. It is that important. Those who disagree are fooling themselves AND others. The methods the Pope has mentioned above and in the past are not "pushing the envelope" or "trying new things" type of thinking... they are simply MISTAKES several hundred people have learned when porting cylinder heads over the years. Lowering the floor isn't 100% bad... but you must know what you are doing. How do you know how you are doing if you don't have anything to verify it with?

But, on your idea Garret... I actually have a theory that going bigger on a turbo's port(s) may actually help in a *high* boost situation, but only if the quality of the flow is still there (not turbulent). It is a theory...meaning an idea. Even in an NA application, the pressure rise via the combustion process is waaay greater than the test pressure we use on a flowbench to simulate the airflow. NA porters strive for great velocities which is another discussion on it's own... but I have an idea that when running high boost, that velocity we strived for in an NA form may become a bottle neck once we double and triple the airflow through a port via boost. So... I was going to hog out a G-head for a friend's GLHS, but he never got it going this summer. My thoughts are larger port volumes... but quality of airflow even though it may test low on the flowbench due to the velocity it's being tested at. Add 25+psi of boost, then maybe this may hold true.

[Garret]

I feel that with a Turbo engine, the compressor housing provides all the backpressure you need and because of that you need volume to fill the ports then that volume will push it's way thru the turbine... That's close to what I mean but it's not "exactly" what I mean... I'll figure out a way to word it properly

[DirectConnection]

Quote:

Originally Posted by Garret I feel that with a Turbo engine, the compressor housing provides all the backpressure you need and because of that you need volume to fill the ports then that volume will push it's way thru the turbine... That's close to what I mean but it's not "exactly" what I mean... I'll figure out a way to word it properly

If you ever get the chance like I did to check out a Top Fuel head, do it. I was amazed that it had no taper (which is very important for reasons that will take up another thread) but alot of volume. The throat was the same size as the seat basically and the runner was the same ID all the way through. Alot of airflow going through that one intake port(1,000hp worth) and under alot of pressure as well (35-45psi).

[The Pope]

Quote:

Originally Posted by DirectConnection If you ever get the chance like I did to check out a Top Fuel head, do it. I was amazed that it had no taper (which is very important for reasons that will take up another thread) but alot of volume. The throat was the same size as the seat basically and the runner was the same ID all the way through. Alot of airflow going through that one intake port(1,000hp worth) and under alot of pressure as well (35-45psi).

There is an example of a flow bench nightmare. One of the best flow benches for race heads is the Super Flow 1200 and they can't pump enough air to test the Stage V race head. In the upper lifts the bench fails to give a reading, in fact, long before the lift of the cam gets tested. They run a head at a lift that can't be tested at 43 PSI of boost.

[turbovanman]

Guys, your jacking his thread??????????????

[SMPerformance]

Quote:

Originally Posted by DirectConnection But, on your idea Garret... I actually have a theory that going bigger on a turbo's port(s) may actually help in a *high* boost situation, but only if the quality of the flow is still there (not turbulent). It is a theory...meaning an idea. Even in an NA application, the pressure rise via the combustion process is waaay greater than the test pressure we use on a flowbench to simulate the airflow. NA porters strive for great velocities which is another discussion on it's own... but I have an idea that when running high boost, that velocity we strived for in an NA form may become a bottle neck once we double and triple the airflow through a port via boost. So... I was going to hog out a G-head for a friend's GLHS, but he never got it going this summer. My thoughts are larger port volumes... but quality of airflow even though it may test low on the flowbench due to the velocity it's being tested at. Add 25+psi of boost, then maybe this may hold true.

[CSXT404]

Typert...when is my baby expecting to arrive?
MarkS

[moparzrule]

Very awsome work indeed.

[typert]

Quote:

Originally Posted by CSXT404 Typert...when is my baby expecting to arrive? MarkS

Check your PM

[ForceFed Wraith]

Typert ... when do you want my money? When will you have more of these manifolds?

[typert]

Quote:

Originally Posted by ForceFed Wraith Typert ... when do you want my money? When will you have more of these manifolds?

I will have 2 more available within the next few weeks - Since I know they are coming if someone wants to reserve them I can take a deposit. I need to get some more flanges made for the next batch. Deposits are refundable.

[John B]

Quote:

Originally Posted by Garret Well with all this secret handshake crap that goes on with people and porting heads

OK guys, who told him about the handshake?

[TurboShadowES]

Id like to get one of typert's manis if the other arent claimed. let me know man.

[typert]

Quote:

Originally Posted by TurboShadowES Id like to get one of typert's manis if the other arent claimed. let me know man.

yes one is available