BritishV8 Forum: "Port and Flow Test"

roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

"Port and Flow Test"

Posted by: roverman
Date: July 30, 2012 02:07PM

This is a shameless plug for David Vizard's, latest and greatest , How To, available through SA Design. I thought I knew a few things about air flow, but now am convinced, how a little knowledege can be dangerous ! Truly impessive work and all secrets revealed ? IMHO, do not buy your next aftermarket heads based on sales-pitch flow #'s ! Good Luck, roverman.

Edited 1 time(s). Last edit at 07/30/2012 04:09PM by roverman.

BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6470 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar

Re: "Port and Flow Test"

Posted by: BlownMGB-V8
Date: July 30, 2012 02:12PM

So based on David's work, how good are the TA heads?

Jim

roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: "Port and Flow Test"

Posted by: roverman
Date: July 30, 2012 02:36PM

IMHO, (pilgrim porter), they are the best "300" heads ever built. No swirl in the bowl area, maybe average aftermarket turbulence. Take out about 5-8 lbs of aluminum, and you "might" roll some impressive #'s. 2.02" intake should help at bottom and top of lift. Will likely need "build-up" on intake bowl area for decent swirl. Many more questions than answers. I seriuously doubt this head was developed with: A. swirl meter B. Computational Fluid Dynamics C. wet flow testing or D. Pressure Differential Valve Test. Other than these (4) picky points, it still seems to be better than what else is available. Onward, roverman.

Edited 1 time(s). Last edit at 07/30/2012 04:12PM by roverman.

minorv8
Jukka Harkola

(269 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Re: "Port and Flow Test"

Posted by: minorv8
Date: July 31, 2012 12:55AM

Have you actually received the heads ???

roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: "Port and Flow Test"

Posted by: roverman
Date: July 31, 2012 11:39AM

Yes Jukka, They "do" exist ! Heavy duty, as in 27lbs. ea, empty ! I'm trying to get someone like David Vizard involved, for optimum developement. Intake port is 1964, 300 Buick size. At this point it appears material will need to be added at intake bowl area, to enhance swirl. Titanium 2.02 and 1.6 valves,(change-out the seats and guides). I shall cc' the standard ports next. Mike at TA says to raise the roof of intake port .500", for maximum flow. In other words, remove 5-8lbs of aluminum, for a serious race motor. Cheers, roverman.

Jim Stabe
Jim Stabe
San Diego, Ca
(829 posts)

Registered:
02/28/2009 10:01AM

Main British Car:
1966 MGB Roadster 350 LT1 Chevy

authors avatar

Re: "Port and Flow Test"

Posted by: Jim Stabe
Date: July 31, 2012 12:04PM

Art

A cubic inch of aluminum weighs about 1/10 of a pound so 5 lbs of aluminum would be equivalent to a bar 2" x 4" x 8" long. How in the world are you going to remove that much material from the ports of a head?

crashbash
david bash
st. charles
(215 posts)

Registered:
01/28/2008 10:53AM

Main British Car:
1979 MGB Rdst V8 project, 1968 MGC GT, 1969 MGB Rd olds 215

Re: "Port and Flow Test"

Posted by: crashbash
Date: July 31, 2012 02:17PM

Just curious how you know how much porting you can safely do on your heads Art. Have you got cross sections, xrays?

roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: "Port and Flow Test"

Posted by: roverman
Date: July 31, 2012 02:22PM

Jim, David and clan,ok correction time, I "should" have said approximately. Math time, let's see, 27lbs minus, would you believe 10% = 2.7 lbs. ? I defer to my original disclaimer,(pilgrim porter). My point is/was, "Hey Mike, why so small" ? Ports will easily go 30% larger with plenty of aluminum, left over.Mike "said" .5" taller, on intake. Much of long side intake port, on outside of casting, is measurable. By comparison, a bare 64' head weighs 16+ lbs ? Perhaps I should take the bitter pill, and pay for Mike's cnc porting ? Yes we want acceptable velocity, but are folks buying these to build a put-put 4L ? David Vizard, please help. Thanks, roverman.

Edited 1 time(s). Last edit at 07/31/2012 02:34PM by roverman.

roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: "Port and Flow Test", why a forum.

Posted by: roverman
Date: July 31, 2012 04:04PM

Because we think, outside the trees. David, Good questions, if I don't have TA, cnc the heads, sonic testing is the way to go. This "might" be possible at Dr. J's,(Brice Mulvey). For beryllium valve seats, PEP seems to be the best deal. Onward, roverman.

BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6470 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar

Re: "Port and Flow Test"

Posted by: BlownMGB-V8
Date: July 31, 2012 06:54PM

I don't know what Mike charges but the CNC porting should be a good starting point. I'd ask around on the Buick board to see what the racers think of the TA porting job before deciding. They would know if anybody does.

Jim

roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: "Port and Flow Test"

Posted by: roverman
Date: July 31, 2012 09:53PM

FWIW, there is .800" of solid aluminum, above the intake ports. There is a reason this bare head weighs 27lbs. roverman.

roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: "Port and Flow Test", Update 8/06/12

Posted by: roverman
Date: August 06, 2012 04:08PM

I spoke to "Mike Sr." today. There is NO cnc porting program available. He says they flow 270 int. cfm., with minor porting, roughly standard 300 size opening with bowl and short turn work, using the standard 1.94 intake valve. Exhaust port needs more volume. Onward, roverman.

BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6470 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar

Re: "Port and Flow Test"

Posted by: BlownMGB-V8
Date: August 06, 2012 10:55PM

That is a surprise. I thought it would use a slightly modified V6 porting routine.
Guess not.

Jim

roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: "Port and Flow Test", Update 8/07/12

Posted by: roverman
Date: August 07, 2012 12:23PM

"Mike" is quoting 270 cfm., with basic bowl and short turn work. This is with 64'- 300 size runners,no velocity or "cc" quotes.My WAG, for intake is 150-160 cc ? I have sent (1) bare head to Brice Mulvey, for sonic testing. I have heard nothing-back from V8 Buick board. Onward, roverman.

Edited 1 time(s). Last edit at 08/07/2012 10:26PM by roverman.

roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: "Port and Flow Test", update 8/23/12

Posted by: roverman
Date: August 23, 2012 03:08PM

Sonic test of head is complete. Awaiting return of head and printed report. Awaiting word from my first choice, airflow guru, to take this to the next level. Cheers, roverman.

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