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#1
08-30-2012, 11:17 PM
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KRE D-port flow numbers from small to large ex. valve
Ok, here we go with some flow numbers. First off, I flowed this head[#1 cyl] before I valve jobbed it and after. These are Kauffman D-port CNC ported heads. They had installed in them 2.11"/1.66" Ferrea valves. I left the intake valves alone[except for re-facing them and cutting the 30° backcut a little wider. I opened the exhaust up to the 1.77" Ferrea valve and backcut the valve to 30° also. I installed larger O.D. seats in the exhaust, interlocking them into the intake seat. I will try to post pics tomorrow. Since I am cutting the exhaust to a larger valve, it allows me to cut a real nice radius entry into the exhaust port. Keep in mind that the valve seat I installed had the same size I.D. as the seat it replaced so the port below the seat insert is exactly the same size as it was before. The only thing that changed was the entry from the seat angle itself. The cutter I use has a real nice radius to give a nice venturi. This will pick the flow up considerably from a 3 angle valve job. You'll be amazed at the difference.
I flowed this head on a Superflow 600 bench. Pretty much the standard of the industry. Flowed them at 28" of water. I will list the flow as Intake before/after followed by the Exhaust before/after followed by the CFM improvement and then followed by the E-I flow percentage before/after. Then I averaged the flow at all 15 flow points[from .100" lift to .800" lift in .050" increments]. Keep in mind that an average of 4 CFM better is huge. It doesn't sound like much but sometimes you need 10 cfm better at several points and the same at others just to get 3-4 cfm average better. So, I consider 5 CFM or more average better to be huge. Here we go. Heads as I received them with 3 angle valve job. Lift___Intake B/A____Improvement_Exhaust B/A___Improvement_______E-I ratio%____ .100_____68/71________+3cfm_____54.2/64.6_____+10.4cfm__________80/91______ .150___103.6/105.1____+1.5cfm____78.7/92.2_____+13.5cfm__________76/88______ .200___136.9/136.6____-.3cfm____103.4/119.6____+16.2cfm__________76/88______ .250___166.3/169.9____+3.6cfm___122.1/140_____+17.9cfm___________73/82______ .300___193/200.5______+7.5cfm___135.8/160_____+24.2cfm__________70/80_______ .350___219.8/228.7____+8.9cfm____146/175______+29cfm____________66/77______ .400___243/251.3______+8.3cfm___156.8/187.2___+30.4cfm___________65/75______ .450___264.3/273.2____+8.9cfm___164.8/198.4____+33.6cfm__________62/73______ .500___282.2/291.2____+9cfm_____171.2/204.8___+33.6cfm___________61/70______ .550___297/303.3______+6.3cfm___179.2/211.2___+32cfm____________60/70______ .600___304.6/310.9____+6.3cfm___185.6/215.7____+30.1cfm__________61/69______ .650___309.1/315.8____+6.7cfm___190.4/219.2____+28.8cfm__________62/69______ .700___313.6/319______+5.4cfm___194.6/222.1____+27.5cfm__________62/70______ .750___315.4/321.7____+6.3cfm___198.4/224______+25.6cfm__________63/70______ .800___317.2/320.3____+3.1cfm___201.6/226.6____+25cfm____________64/71______ The intake average before was 235.6, and now is 241.23. That's 5.63 CFM average better. The exhaust was 152.18 before and now is 177.37. That's a 25.19 cfm better average! That's huge! This was done with no porting at all, just simply cutting it for a bigger valve, and better angles on the intake.
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Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
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#2
08-31-2012, 06:59 AM
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I really cant go along with the huge thing Paul, at least Intake flow wise as it take`s 2 CFM of Intake airflow on a well built 12.5 + compression race motor to just make 1 HP per cylinder on average!
I do like converting over 1.66 exh set ups to 1.77" as the right valve job like your flow numbers show can add a bunch of flow with very little added porting work. This goes double for the small valve factory heads where the much needed low lift flow at blow down can be picked up in large amounts.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#3
08-31-2012, 07:06 AM
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I thought it was for every cfm of intake flow there was potentiality 2 hp?
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#4
08-31-2012, 09:40 AM
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Paul,
What cfm were the heads originally? Were they ported at KRE? I have a set of 72 cc 310 CFM D-ports ported and purchased from KRE and am interested in your data. Good job!! Thanks Karguy |
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#5
08-31-2012, 01:10 PM
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They were the 325 version.
__________________
Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
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#6
08-31-2012, 01:11 PM
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Quote:
__________________
Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
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