AFRs bench flowed
Thread Starter
Drifting
Joined: Nov 2002
Posts: 1,587
Likes: 0
From: Colorado Springs CO
AFRs bench flowed
I dont have the sheets or any of the other data. Will see if I can get the printouts. I know that you can really hog out heads and get big numbers, and AFR has great port velocity as well as high flow numbers. No idea what the velocity is on 6.0L heads.
But my tuner called me today with the numbers. They ran the test on the same machine, same setups etc etc
My old setup was 6.0L heads stage III 2.02 valves and 1.60
258 at .600 intake and 217 at .600 exhaust
AFR 225's right out of the box 2.080 and 1.60 valves
288 at .600 intake and 214 at .600 exhaust.
on the website AFR shows
320 at .600 intake and 250 at .600 exhaust
That is a solid 40cfm higher on both.
Any ideas why the local tuners numbers were so low, or why AFR numbers are so high????????????????????
But my tuner called me today with the numbers. They ran the test on the same machine, same setups etc etc
My old setup was 6.0L heads stage III 2.02 valves and 1.60
258 at .600 intake and 217 at .600 exhaust
AFR 225's right out of the box 2.080 and 1.60 valves
288 at .600 intake and 214 at .600 exhaust.
on the website AFR shows
320 at .600 intake and 250 at .600 exhaust
That is a solid 40cfm higher on both.
Any ideas why the local tuners numbers were so low, or why AFR numbers are so high????????????????????
Racer
Joined: Dec 2004
Posts: 331
Likes: 1
From: Sellersburg IN
That is very interesting. I would like to know the same thing. I was thinking of getting a set of AFR's or Allpro heads. I was leaning towards the AFR's due to the flow numbers but now I don't know.
Le Mans Master
Joined: Apr 2001
Posts: 5,474
Likes: 717
From: Black Forest CO
Can air density affect flow numbers? It seems like it could but that is out of my area of expertise... The flow testing was done on a SuperFlow flow bench at an altitude of ~6000 feet.
I asked the local guy what bore size was used to obtain the flow numbers and he did not know. He was going to check.
I asked the local guy what bore size was used to obtain the flow numbers and he did not know. He was going to check.
Former Vendor
Joined: Nov 2002
Posts: 4,003
Likes: 12
From: Toronto Ontario
AFR vs Stock
Every flow bench operator is different. It all depends on temp,inches of vac.,velocity stack used on ports,and cyl. bore size. But @ least you can see that there was a 30 cfm difference between the two heads with the same conditions.
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Le Mans Master
Joined: Sep 2000
Posts: 6,976
Likes: 527
From: Clouds Over California
Originally Posted by Yano
I dont have the sheets or any of the other data. Will see if I can get the printouts. I know that you can really hog out heads and get big numbers, and AFR has great port velocity as well as high flow numbers. No idea what the velocity is on 6.0L heads.
But my tuner called me today with the numbers. They ran the test on the same machine, same setups etc etc
My old setup was 6.0L heads stage III 2.02 valves and 1.60
258 at .600 intake and 217 at .600 exhaust
AFR 225's right out of the box 2.080 and 1.60 valves
288 at .600 intake and 214 at .600 exhaust.
on the website AFR shows
320 at .600 intake and 250 at .600 exhaust
That is a solid 40cfm higher on both.
Any ideas why the local tuners numbers were so low, or why AFR numbers are so high????????????????????
But my tuner called me today with the numbers. They ran the test on the same machine, same setups etc etc
My old setup was 6.0L heads stage III 2.02 valves and 1.60
258 at .600 intake and 217 at .600 exhaust
AFR 225's right out of the box 2.080 and 1.60 valves
288 at .600 intake and 214 at .600 exhaust.
on the website AFR shows
320 at .600 intake and 250 at .600 exhaust
That is a solid 40cfm higher on both.
Any ideas why the local tuners numbers were so low, or why AFR numbers are so high????????????????????
Out of the box the AFRs do really good.
Just for reference my LS6 Heads done by A&A's head shop flowed
298 @ .500 lift and 312 @ .550 lift on the intake. Exhaust was 255@.550 lift. Chamber Volume 77cc. 2.02 and 1.577 Valves.
Thread Starter
Drifting
Joined: Nov 2002
Posts: 1,587
Likes: 0
From: Colorado Springs CO
Ok here are more numbers
AFR heads
@.100
67 in 58 ex
@.200
155 in 110 ex
@.300
216 in 160 ex
@.400
252 in 193 ex
@.500
280 in 203 ex
@.600
288 in 214 ex
@.700
294 in 221 ex
AFR heads
@.100
67 in 58 ex
@.200
155 in 110 ex
@.300
216 in 160 ex
@.400
252 in 193 ex
@.500
280 in 203 ex
@.600
288 in 214 ex
@.700
294 in 221 ex
Melting Slicks
Joined: Feb 2002
Posts: 2,285
Likes: 2
From: Crooks SD
Originally Posted by Shinobi'sZ
Out of the box the AFRs do really good.
Just for reference my LS6 Heads done by A&A's head shop flowed
298 @ .500 lift and 312 @ .550 lift on the intake. Exhaust was 255@.550 lift. Chamber Volume 77cc. 2.02 and 1.577 Valves.
Just for reference my LS6 Heads done by A&A's head shop flowed
298 @ .500 lift and 312 @ .550 lift on the intake. Exhaust was 255@.550 lift. Chamber Volume 77cc. 2.02 and 1.577 Valves.
NCM, WSCC &amp;amp; SCC Member
Joined: Oct 2002
Posts: 2,900
Likes: 1
My LQ9's flow 348cfm at .600
Mine are about 20 cfm short of absolute best (non-C5R LS6) heads right now from TEA or Cartek IV's. Still waiting to be impressed by the AFR's. So is Cartek. Maybe someday, we can strap those things on to bench and go down the 1/4.
Le Mans Master
Joined: Sep 2000
Posts: 6,976
Likes: 527
From: Clouds Over California
Originally Posted by Jesse_Boyer
Nice numbers, but same question as above. What were the low lift numbers? Also, do you know the intake runner volume?
I will have to find my sheet, I bet I got them beat.
You noticed I was hitting over 300 without going up to .600 lift too.
Le Mans Master
Joined: Sep 2000
Posts: 6,976
Likes: 527
From: Clouds Over California
Originally Posted by #001 2001 Z06
299 cfm at .450 for me. Just E-mailed flow sheets to Kevin. I am retarded in the posting department.
I just read your flow sheets. I think I know who did those heads, he did great work (Tim). Richard owns WCCHs..he is not only cool but is a Master. Great numbers with the 6.0l heads. It looks like the LS7 heads are going to flow like 360 from the factory, but I can't remember what lift. It will be interesting when the LS7 heads start hitting the streets, so we can get some additional flow data on them.
Le Mans Master
Joined: Sep 2001
Posts: 8,840
Likes: 43
From: State of Confusion.
Originally Posted by Shinobi'sZ
I just read your flow sheets. I think I know who did those heads, he did great work (Tim). Richard owns WCCHs..he is not only cool but is a Master. Great numbers with the 6.0l heads. It looks like the LS7 heads are going to flow like 360 from the factory, but I can't remember what lift. It will be interesting when the LS7 heads start hitting the streets, so we can get some additional flow data on them.
Melting Slicks
Joined: Feb 2002
Posts: 2,285
Likes: 2
From: Crooks SD
Originally Posted by LuvmyC5
What size are the intake ports on the new LS7 heads, that definitely will help high lift flows, and, I believe that they have 2.1" intakes, which also helps flow. Nonetheless, they will be one of the nicest set of heads available for a stroker, much less an OEM head!
Although, they might not be ideal for low cube engines if the intake ports are large, right? Big port, low velocity = lower torque at low R's
Le Mans Master
Joined: Sep 2001
Posts: 8,840
Likes: 43
From: State of Confusion.
Originally Posted by Jesse_Boyer
Although, they might not be ideal for low cube engines if the intake ports are large, right? Big port, low velocity = lower torque at low R's
I'd think that the heads were made to flow some big numbers, and would work with a big cam (.600"+ of lift). We'll see how they work in a couple of months.