Who flowed there AFR 225 heads when they purchased them?
#1
Teching In
Thread Starter
Join Date: Mar 2002
Location: Ok.
Posts: 44
Likes: 0
Received 0 Likes
on
0 Posts
Who flowed there AFR 225 heads when they purchased them?
I just flowed my 225 cnc AFR heads today. I pulled one head out of the box and brought it to our machine shop. I am not happy with the results. They were flowed on a Super flow - 600 @ 28 water and 4.125 bore. Temp was 74 degrees at 3:00pm
cfm intake exhaust
200 130 108
300 192 159
400 246 200
500 284 219
600 313 227
700 335 233
The exhaust was flowed without a pipe. These numbers are much lower then AFR's advertised numbers. I was wondering if anyone else has had lower flow numbers? I can understand and except 1 to 3 cfm difference between flow benches but not 7 cfms at 600 on the intake and 23 cfm's on the exhaust side.
cfm intake exhaust
200 130 108
300 192 159
400 246 200
500 284 219
600 313 227
700 335 233
The exhaust was flowed without a pipe. These numbers are much lower then AFR's advertised numbers. I was wondering if anyone else has had lower flow numbers? I can understand and except 1 to 3 cfm difference between flow benches but not 7 cfms at 600 on the intake and 23 cfm's on the exhaust side.
#3
Teching In
Thread Starter
Join Date: Mar 2002
Location: Ok.
Posts: 44
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by LIL SS
You can't compare the exhaust IMHO.. Apples and Oranges..
I'm assuming the intake was not on the head when flowed?
I'm assuming the intake was not on the head when flowed?
#4
TECH Veteran
iTrader: (21)
7 cfm isn't bad. In fact, I'd say it would fall into the "normal" catagory. Lots of things can factor into how the head flows on a diffrent bench. Air density, humidity, temperature, placement of the head on the bench, and so on can all cause variations. Tony from AFR made a statement that the AFR heads are designed to work with the pipe in place on the exaust. They don't focus on flow without a pipe in place. If the head is ported for the pipe, then flow without the pipe could suffer alot. I wouldn't worry about it at all. If you want the numbers to pick up, flow the head when it is colder and deffinatlly put the pipe on the exaust.
#5
Actually your flow results look different then any 225 I have flowtested in the past....Our 225's do not continue to climb on the intake side till .700 as your results seem to indicate....most will peak around .600 to .630 valve lift, but none of the 225's I have tested will pull cleanly to .700 (they were designed to be more effective in the .200-.600 range and still have only a moderate cross sectional area....few LS heads will pull clean to .700 and the ones that do are much larger (typically) and might have steeper seat angles to enhance peak numbers). ANYWAY...that leads me to somewhat question your results (what bench, what bore size, clay or radius entry, what flow tube.....yada yada). If your questioning what you purchased feel free to call me at AFR so I might be able to better help you over the phone and possibly arrange the freight back to us so we can evaluate the cylinder heads....to be very honest with you, I would be VERY surprised if your heads dont flow what we advertise (or extremely close)....I have been personally spot flowing alot of the 225's that are leaving our door, and they have all been right at advertised (within a few CFM's) and some better (322-324 @ .600). While it is certainly possible there might be a problem with your heads, based on what I have been seeing (and hearing elsewhere) I think it is far less likely that is the case.
Please contact me at AFR and we can discuss it...
Thanks,
Tony M.
(818)890-0616 Ext. 109
PS....Milling the cylinder heads for higher CR will also effect the flow numbers....just an FYI.
Please contact me at AFR and we can discuss it...
Thanks,
Tony M.
(818)890-0616 Ext. 109
PS....Milling the cylinder heads for higher CR will also effect the flow numbers....just an FYI.
Last edited by Tony Mamo @ AFR; 04-12-2005 at 05:37 PM.
#6
Teching In
Thread Starter
Join Date: Mar 2002
Location: Ok.
Posts: 44
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Tony Mamo @ AFR
Actually your flow results look different then any 225 I have flowtested in the past....Our 225's do not continue to climb on the intake side till .700 as your results seem to indicate....most will peak around .600 to .630 valve lift, but none of the 225's I have tested will pull cleanly to .700 (they were designed to be more effective in the .200-.600 range and still have only a moderate cross sectional area....few LS heads will pull clean to .700 and the ones that do are much larger (typically) and might have steeper seat angles to enhance peak numbers). ANYWAY...that leads me to somewhat question your results (what bench, what bore size, clay or radius entry, what flow tube.....yada yada). If your questioning what you purchased feel free to call me at AFR so I might be able to better help you over the phone and possibly arrange the freight back to us so we can evaluate the cylinder heads....to be very honest with you, I would be VERY surprised if your heads dont flow what we advertise (or extremely close)....I have been personally spot flowing alot of the 225's that are leaving our door, and they have all been right at advertised (within a few CFM's) and some better (322-324 @ .600). While it is certainly possible there might be a problem with your heads, based on what I have been seeing (and hearing elsewhere) I think it is far less likely that is the case.
Please contact me at AFR and we can discuss it...
Thanks,
Tony M.
(818)890-0616 Ext. 109
PS....Milling the cylinder heads for higher CR will also effect the flow numbers....just an FYI.
Please contact me at AFR and we can discuss it...
Thanks,
Tony M.
(818)890-0616 Ext. 109
PS....Milling the cylinder heads for higher CR will also effect the flow numbers....just an FYI.