cacique123

Some interesting information on flow rates on honda heads,
B18C5 - 248 cfm int. @ .450" valve lift 196 cfm @ .450 valve lift ext
d16z6 216 cfm int @ .450 valve lift 161 cfm @ .450 valve lift ext

Bone1

D15B7/D16A6 head for my D15Baby8 build, smaller valves than Z6, will have 14:1 compression.

231 cfm @ .450"/192 cfm @ .450"

Yeah, it's a sweet head

Oscar

Weird, you'd expect the c5 head to flow a little more than that.

a stock f22a head flows 264/160cfm @.450". The exhaust obviously blows *** on f22a's.

Bone1

right, telll that to Bisi

Guy-Fast

What flowbench was this done on. Those d series #'s look very high and the b looks very low

J-MAN

here's my flow #'s from my old gsr head.. this is on SuperFlow SF-1020

intake (stock/ported).... measured lift.......... Exhaust(stock/ported)
37.1 / 38 cfm ..................... 0.050"..................... 28.2 / 34.4 cfm
81.6 / 79.5 cfm ..................... 0.100"..................... 72 / 73 cfm
120.5 / 124.5 cfm .................. 0.150".................. 117 / 123 cfm
154.2 / 159.3 cfm .................. 0.200".................. 150.5 / 172 cfm
178.5 / 182.3 cfm .................. 0.250".................. 169 / 206 cfm
198.8 / 209.5 cfm .................. 0.300".................. 179 / 220 cfm
216.5 / 231.5 cfm .................. 0.350".................. 183 / 229 cfm
232.5 / 249.5 cfm .................. 0.400".................. 185 / 233 cfm
245/ 260 cfm ........................ 0.450".................. 188 / 236 cfm
253 / 269.5 cfm .................... 0.500".................. 190 / 239.5 cfm

Bone1

Just like a dyno Chris, so take the info with a gain of salt.

http://www.besracing.com/porting.html

BES runs a Dual Flow flowbench to provide us with a solid starting point in optimizing flow. When that's done, our experience takes over, and experience is the key to making horsepower.

Nobody drives a flowbench down the dragstrip. Heads have to work at 9,000 RPMs under heat, tension and G-forces. Intake and exhaust dynamics have to be taken into account as well. The bottom line is making horsepower is not as simple as flowbench readings. There's a lot more to it.

The BES Team takes a "whole-engine" approach to flow, and flowbench data plus our many years of experience is what sets us apart. Our heads will make horsepower. Period.

You might have heard of BES, they've won the Enginemasters buildoff the past two years

Tony, after seeing pics of my D15Baby8 progress at 14:1 compression has suggested milling most of the dome off the P29's in the name of better flame travel. The gains will equal of better the losses from the slightly lower compression. I about died when he called it making the dome "softer" (insert ENDYN joke) btu knew he wasn't joking.

cacique123

Flow carictaristis are out of my area of expertise but the information is from a local trusted engine builder, this is a little more of what I found out

1.8 GSR
INT. 236 cfm @ .450 valve lift
EXH. 179 cfm @ .450 valve lift

D16 Open Chamber
INT. 216 cfm @ .450 valve lift
EXH. 161 cfm @ .450 valve lift

D16 Closed Chamber
INT. 209 cfm @ .450 valve lift
EXH. 153 cfm @ .450 valve lift

i am unsure but one D16 is a Z6 and the other is a Y

B16 2nd gen
INT. 216 cfm @ .450 valve lift
EXH. 173 cfm @ .450 valve lift

as a comparison

Neon 2.0l 1 gen
INT. 202 cfm @ .450 valve lift
EXH 125 cfm @ .450 valve lift

just some more interesting date to share