Thread: B16's cc'd QR head unofficial number(NOW OFFICIAL)

As of right now its unoffical til I get another oral injector, fluid was not constatant coming out at the last portion, and the numbers weren't all that readable where I stopped at. I'm also gonna see if the valves were leaking.Now the injector I was using was in mL and mL= cc. Well with out futher interruption....the unofficial number is

thought we had a drum roll smiley???

55.6

seal the valves and the plexi with grease or vaseline to make sure they don't leak

the glass was sealed, I wanted to see if the valves would leak, I'm gonna do it a couple more times with a better injector but this may give people something to go off of.

Any body remember what the B15 was cc'd at

Originally Posted by CrickiKaze

Any body remember what the B15 was cc'd at

think Joe has the numbers. Also anyone remember what the CFM head flow was? I remember the numbers being on myspecv

Originally Posted by LE25

think Joe has the numbers. Also anyone remember what the CFM head flow was? I remember the numbers being on myspecv

I'll have to check the archive.

Just in case some one can find it before me
- MySpecV Archive

think I found it, third to last post
port and polish - MySpecV Archive
The QR25 ports flow 213 cfm on the intake side and 180 cfm on the exhaust side, taken at 28" of water

YEP! thanks..

This is a definition of Port and Polish taken from the Ask Sarah section of Nissanperformancemag.com.

"The QR25 ports flow 213 cfm on the intake side and 180 cfm on the exhaust side, taken at 28" of water. Just as a comparison, the SR20DE head flows at 175 cfm on the intake side and 154 cfm on the exhaust side. Porting focuses on 4 main areas to obtain a better flowing head- the airflow from the intake manifold to the intake port entry on the head, the edges around the valve guide bosses at the top of the valve pockets, casting bumps or ridges on port floors or roofs, and where the intake port floor curves down to the valve seat. Polishing the combustion chambers afterward inhibits carbon buildup making the engine less likely to detonate. Mild porting in the valve pocket area and valve seat and port matching of the intake manifold to the cylinder head has shown gains of 5-7% on the QR25 head, pretty substantial considering how well it flows stock."

gen I qr head CC's at 55cm^3 too

Originally Posted by Justin@2J-Racing

gen I qr head CC's at 55cm^3 too

makes me wonder..... I might have to "borrow" my kids play-do, to show everybody how the sides of the chamber is a little "sunken in". Its hard to see in pics.

Like I said I'm gonna redo the measurement.

don't forget there may be a hair more material around the plugs. it uses a 12mm vs 14mm on the b15

crappy pics, but you get the idea.




also b15 exhaust gasket up against the newer head. shows the ports to be slightly bigger.

also one from the top to give you a sense of the shape of the chamber..

they worked really hard to get the chamber to the same volume as it predcessor, granted, we will see later but I'm still gonna play-do them.

so...

I will be getting this flowbenched in about 2-3 weeks, I will also have him cc the head for 2nd confirmation.

I also have a spare 1st gen QR head for testing as well incase there are any discrepancies from what we already know.

Thanks to Doc_Ebs on allsentra on getting me this big biatch

re cc'd it on 2 seperate chambers and got...


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