How much difference is 14cfm?
How much difference is 14cfm? I'm debating between two heads for the LS2. One flows a peak of 310cfm while the other flows 324 cfm. The difference in price is $600. About how much extra power would this translate into figuring the same mods on both? Will the power difference be exponentially higher on the better flowing heads with a big cam?
Thanks for the help.
Thanks for the help.
Originally Posted by LSxChevelle
Do L92 heads. 325+cfm unported for under $800/pr complete. The new intake to go with it will be out in about a month I think.
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Joined: Sep 2005
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From: DFW, TX
Originally Posted by LSxChevelle
Do L92 heads. 325+cfm unported for under $800/pr complete. The new intake to go with it will be out in about a month I think.
your heads with a ported fast 90 maybe able to flow to the full potential of the heads. the problem is that most intakes are not capable of flowing enough to feed these big CFM heads.
Originally Posted by Blown04Z06
id do it once the intake is out for sure and has a price tag on it and in stock.
your heads with a ported fast 90 maybe able to flow to the full potential of the heads. the problem is that most intakes are not capable of flowing enough to feed these big CFM heads.
your heads with a ported fast 90 maybe able to flow to the full potential of the heads. the problem is that most intakes are not capable of flowing enough to feed these big CFM heads.
well it's already been provin that an ls7 intake can keep up with the ls7 heads with little work..GM finnaly grabbed there ***** this time and it shows.
Originally Posted by sr71bbjr
well it's already been provin that an ls7 intake can keep up with the ls7 heads with little work..GM finnaly grabbed there ***** this time and it shows.
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Originally Posted by LSxChevelle
Do L92 heads. 325+cfm unported for under $800/pr complete. The new intake to go with it will be out in about a month I think.
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Originally Posted by 9ball
I'm debating between two heads for the LS2. One flows a peak of 310cfm while the other flows 324 cfm. The difference in price is $600. About how much extra power would this translate into figuring the same mods on both? Will the power difference be exponentially higher on the better flowing heads with a big cam?
Thanks for the help.
Thanks for the help.
Does anyone have an answer (educated guess) for his original question?
6600 rpm clutch dump of death Administrator
Joined: Dec 2001
Posts: 4,983
Likes: 13
From: Texas
Ok, a few points.
Unless they were done on the same bench, by the same operator, with the same orifice size, the numbers are meaningless. You can use them only as a "reference". I've seen numbers vary by much more than 14 CFM just based on the bench, the operator, and the test methodology.
Now, with that said, there is a rule of thumb in racing.
HP= CFM X 0.2575 X # OF CYLINDERS for hp potential
The lower the power per cubic inch the more accurate the equation becomes. If you have an extremely efficent motor, then the constant of 0.2575 has to increase.
That being said.
.2575*8 = 2.06 For Race motors, we use 2.15 for a Pro Stock Type motor its around 2.35. Keep in mind these are BALLPARK, and miss about 100 important variables.
310* 2.06 = 638.6
324 * 2.06 = 667.44
Delta = 28.84
Keep in mind you don't see nearly that flow through any of the current intakes. You have to lop off a significant ammount of flow.
Unless they were done on the same bench, by the same operator, with the same orifice size, the numbers are meaningless. You can use them only as a "reference". I've seen numbers vary by much more than 14 CFM just based on the bench, the operator, and the test methodology.
Now, with that said, there is a rule of thumb in racing.
HP= CFM X 0.2575 X # OF CYLINDERS for hp potential
The lower the power per cubic inch the more accurate the equation becomes. If you have an extremely efficent motor, then the constant of 0.2575 has to increase.
That being said.
.2575*8 = 2.06 For Race motors, we use 2.15 for a Pro Stock Type motor its around 2.35. Keep in mind these are BALLPARK, and miss about 100 important variables.
310* 2.06 = 638.6
324 * 2.06 = 667.44
Delta = 28.84
Keep in mind you don't see nearly that flow through any of the current intakes. You have to lop off a significant ammount of flow.
Originally Posted by J-Rod
Ok, a few points.
Unless they were done on the same bench, by the same operator, with the same orifice size, the numbers are meaningless. You can use them only as a "reference". I've seen numbers vary by much more than 14 CFM just based on the bench, the operator, and the test methodology.
Now, with that said, there is a rule of thumb in racing.
HP= CFM X 0.2575 X # OF CYLINDERS for hp potential
The lower the power per cubic inch the more accurate the equation becomes. If you have an extremely efficent motor, then the constant of 0.2575 has to increase.
That being said.
.2575*8 = 2.06 For Race motors, we use 2.15 for a Pro Stock Type motor its around 2.35. Keep in mind these are BALLPARK, and miss about 100 important variables.
310* 2.06 = 638.6
324 * 2.06 = 667.44
Delta = 28.84
Keep in mind you don't see nearly that flow through any of the current intakes. You have to lop off a significant ammount of flow.
Unless they were done on the same bench, by the same operator, with the same orifice size, the numbers are meaningless. You can use them only as a "reference". I've seen numbers vary by much more than 14 CFM just based on the bench, the operator, and the test methodology.
Now, with that said, there is a rule of thumb in racing.
HP= CFM X 0.2575 X # OF CYLINDERS for hp potential
The lower the power per cubic inch the more accurate the equation becomes. If you have an extremely efficent motor, then the constant of 0.2575 has to increase.
That being said.
.2575*8 = 2.06 For Race motors, we use 2.15 for a Pro Stock Type motor its around 2.35. Keep in mind these are BALLPARK, and miss about 100 important variables.
310* 2.06 = 638.6
324 * 2.06 = 667.44
Delta = 28.84
Keep in mind you don't see nearly that flow through any of the current intakes. You have to lop off a significant ammount of flow.
Soooo is it even gonna matter what heads he gets if lets say the intake he has only flows 300?
