As the topic says, I'm looking for Type-R or B16 flowbench results. If anyone knows of any sites for the info it would be great.


Thanks!



[Modified by 89SiR, 1:43 AM 2/11/2003]

 

http://www.alaniztechnologies.com


peace,
judd

 

Thanks! SioneSi

 

Flow bench results always have to be taken with a grain of salt. The reason? They are all based on steady flow. As you probably know, flow through a port is not steady. Rather, it is pulsatile. Because of this, you cannot say that one head is better than another based of flow bench results. A head that appears to flow worse under conditions of steady flow may actually flow better in a running engine.

 

There is another thing that seems fishy here. According to this website, a stock B16A head actually flows slightly better than a stock B18C5 head. If you take a look at the B18C5 vs 2ZZ-GE chart and compare that to the B16A vs B18C1 chart, you will find that the B18C5 numbers are just the B16A numbers rounded down to the nearest whole number. Now don't tell me that the B18C5 head doesn't even flow as well as a stock B16A head. You see something else quite strange if you look at the B16A vs H22A vs F20 chart and compare it to the B16A vs B18C1 chart. In this chart, most of the B16A numbers are also rounded down to the nearest whole number. But to make things stranger, they are less at .25 inches lift (104cfm vs 106cfm) and .3 inches lift (116cfm vs 118cfm).


[Modified by StorminMatt, 5:19 AM 2/14/2003]

 

This is where rod stroke, piston speeds, CR, etc. come into play

 

StrominMatt,

Dude, .. gotta disagree with ya here, .. but that's what forums are for, .. discussions.

Steady state flow benches have been used since the 70s and are proven to correlate
directly to the dyno, .. and race track. Although flow does pulse it does it a lot less then you may believe and it has a limited effect on actual airflow through an engine.

One very basic way to look at this, ..
an engine is nothing more then a big air pump, .. the more air that you get through it, . the more power it makes. Don’t buy it??, .. why does a turbo work? A turbo is just a big air pump. And YES cylinder head porting is just as important on a turbo race motor.

Now, .. some cool stuff you can do with a flow bench. The flow curves from low lift to high lift is very important, .. and how the intake and exhaust curve relate is also very important. A sharp cylinder head porter can move the torque curve around, .. move the HP curve around by how he ports the cylinder head. I don’t just mean ad more torque and HP, .. .. but say a drag car, .. you want good hp but you also need a good fat torque curve in a usable rpm range. On a Nat aspirated car this is up to the cylinder head porter, .. and the cams the engine builder chooses, .. and of course cam timing.

We just did a development project for a road racing formula car, ... what we did on the flow bench showed directly on the dyno. It was like my grinder was attached to the dyno curves, .. hummm, .. I want a little more torque at 5000 rpm, .. grind here, .. check it on the flow bench, ... WALAAA, .. showed on the dyno.

One point that you make is very true. Comparing flow number from one bench to another isn’t a smart idea. The way the test was done, .. air inlet on the intake, .. temp, .. humidity, .. etc. all effect flow numbers.

A flow bench is used just like a dyno, .. you have a base line on THAT machine you compare to other tests on THAT SAME MACHINE. It’s a development machine.
Dynos are the same way, .. don’t get into racing dyno numbers from one engine builder to the next.

I’d be wary of any shop that publishes flow numbers and dyno numbers, ..
to me it show that they don’t really understand the tools they are working with.

Curtis


[Modified by Curtis Boggs, 11:49 AM 2/14/2003]

 

i totally agree with curtis, to many people live by flow numbers and often times it is usually the peak number that they brag about, any one with a grinder can make a head big enough to get a awsome peak number, it takes alot of work to get a head that flows good at every lift(area under the curve) while still keeping velocity in the port, that's where the great tool of a flow bench comes in-yes it won't exactly duplicate what the head is seeing when it's on the motor, but it can guide you in the right direction much more then having nothing at all.

 

Head, ..

Ummm, .. I've never called a guy that, .. sorry dude, .. couldn't resist, ..

Yea, .. you know most people do not understand a flow bench, .. dyno, .. and most of all an engine. I mean, .. I couldn't put it in simpler terms, .. it's a big air pump!

So head, .. or anyone, .. have some specific things to discuss, .. ?????

Curtis