3VZ-E Head CFM???
04-08-2005, 03:19 PM
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3VZ-E Head CFM???
Does any one know, or can guess acurately, what the heads would flow on these motors with 1mm oversize valves, and port matching? Thanks.
04-08-2005, 03:55 PM
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EB has some flow test results for his 1mm OS valves. Maybe he will share them with you. http://www.engnbldr.com/
04-09-2005, 12:39 PM
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At full lift?
How much vacuum?
I have some numbers for my performance heads @28 inches I think.
28 inches from what I understand is not what you will see from a motor but in my case it was used for comparison to the DOA junk I started with. I have before and after numbers @28 inches comparing DOA "turn key" heads to what I have now.
How much vacuum?
I have some numbers for my performance heads @28 inches I think.
28 inches from what I understand is not what you will see from a motor but in my case it was used for comparison to the DOA junk I started with. I have before and after numbers @28 inches comparing DOA "turn key" heads to what I have now.
04-09-2005, 01:34 PM
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My head work was done @ Louthan Comp
I had flow numbers ran before and after. The before number represents DOA racings "Turn Key" heads to the tune of $1000+$200 shipping (supposedly having OS valves but they turned out to be stock size.. Go figure huh). The after numbers represent Robs port work combined with Engnbuilders 1mm OS valves. These numbers where ran only to compare apples and apples from the same bench. Getting the DOA heads fixed/repaired ran me $700. Rob reused the guides and they where still clean enough to avoid a hot tank trip having only 8k miles on them. Keep in mind 3.0 cams only have about .4 of lift. I dont think these numbers represent Engine vacuum so again they are just for comparison purposes.
INTAKE SIDE
#1) .125 lift in CFM
Before:118.8
After :145.6
#2) .250 lift
Before:147.2
After :168.5
#3) .375 lift
Before:149.1
After :171.3
#4) .500 lift
Before:150.9
After :187.4
EXHAUST SIDE
#1) .125 lift in CFM
Before:80.7
After :97.2
#2) .250 lift
Before:85.3
After :105.6
#3) .375 lift
Before:104.7
After :135.8
#4) .500 lift
Before:110
After :143.7
I didn't get a print out of the stock heads but looking at the sheet it was clear that stock flowed better than the DOA head in its current state. The larger Valves allowed this head to surpass the last head he did in all but 1 lift on the exhaust side.
I had flow numbers ran before and after. The before number represents DOA racings "Turn Key" heads to the tune of $1000+$200 shipping (supposedly having OS valves but they turned out to be stock size.. Go figure huh). The after numbers represent Robs port work combined with Engnbuilders 1mm OS valves. These numbers where ran only to compare apples and apples from the same bench. Getting the DOA heads fixed/repaired ran me $700. Rob reused the guides and they where still clean enough to avoid a hot tank trip having only 8k miles on them. Keep in mind 3.0 cams only have about .4 of lift. I dont think these numbers represent Engine vacuum so again they are just for comparison purposes.
INTAKE SIDE
#1) .125 lift in CFM
Before:118.8
After :145.6
#2) .250 lift
Before:147.2
After :168.5
#3) .375 lift
Before:149.1
After :171.3
#4) .500 lift
Before:150.9
After :187.4
EXHAUST SIDE
#1) .125 lift in CFM
Before:80.7
After :97.2
#2) .250 lift
Before:85.3
After :105.6
#3) .375 lift
Before:104.7
After :135.8
#4) .500 lift
Before:110
After :143.7
I didn't get a print out of the stock heads but looking at the sheet it was clear that stock flowed better than the DOA head in its current state. The larger Valves allowed this head to surpass the last head he did in all but 1 lift on the exhaust side.
05-24-2005, 05:00 AM
#7
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Originally Posted by Ganoid
My head work was done @ Louthan Comp
I had flow numbers ran before and after. The before number represents DOA racings "Turn Key" heads to the tune of $1000+$200 shipping (supposedly having OS valves but they turned out to be stock size.. Go figure huh). The after numbers represent Robs port work combined with Engnbuilders 1mm OS valves. These numbers where ran only to compare apples and apples from the same bench. Getting the DOA heads fixed/repaired ran me $700. Rob reused the guides and they where still clean enough to avoid a hot tank trip having only 8k miles on them. Keep in mind 3.0 cams only have about .4 of lift. I dont think these numbers represent Engine vacuum so again they are just for comparison purposes.
INTAKE SIDE
#1) .125 lift in CFM
Before:118.8
After :145.6
#2) .250 lift
Before:147.2
After :168.5
#3) .375 lift
Before:149.1
After :171.3
#4) .500 lift
Before:150.9
After :187.4
EXHAUST SIDE
#1) .125 lift in CFM
Before:80.7
After :97.2
#2) .250 lift
Before:85.3
After :105.6
#3) .375 lift
Before:104.7
After :135.8
#4) .500 lift
Before:110
After :143.7
I didn't get a print out of the stock heads but looking at the sheet it was clear that stock flowed better than the DOA head in its current state. The larger Valves allowed this head to surpass the last head he did in all but 1 lift on the exhaust side.
I had flow numbers ran before and after. The before number represents DOA racings "Turn Key" heads to the tune of $1000+$200 shipping (supposedly having OS valves but they turned out to be stock size.. Go figure huh). The after numbers represent Robs port work combined with Engnbuilders 1mm OS valves. These numbers where ran only to compare apples and apples from the same bench. Getting the DOA heads fixed/repaired ran me $700. Rob reused the guides and they where still clean enough to avoid a hot tank trip having only 8k miles on them. Keep in mind 3.0 cams only have about .4 of lift. I dont think these numbers represent Engine vacuum so again they are just for comparison purposes.
INTAKE SIDE
#1) .125 lift in CFM
Before:118.8
After :145.6
#2) .250 lift
Before:147.2
After :168.5
#3) .375 lift
Before:149.1
After :171.3
#4) .500 lift
Before:150.9
After :187.4
EXHAUST SIDE
#1) .125 lift in CFM
Before:80.7
After :97.2
#2) .250 lift
Before:85.3
After :105.6
#3) .375 lift
Before:104.7
After :135.8
#4) .500 lift
Before:110
After :143.7
I didn't get a print out of the stock heads but looking at the sheet it was clear that stock flowed better than the DOA head in its current state. The larger Valves allowed this head to surpass the last head he did in all but 1 lift on the exhaust side.
ps - so he got the valves to open to a full 0.500"? Any idea what it is that limits the lift on our engines mechanically?
Last edited by Bumpin' Yota; 05-24-2005 at 05:18 AM.
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05-24-2005, 10:26 PM
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Originally Posted by Bumpin' Yota
Any idea what it is that limits the lift on our engines mechanically?
you will just touch the valve guide seal @.500 if I remember correctly. You will probably need a better spring to run any higher RPM at that kind of lift though.
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