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.
So based on David's work, how good are the TA heads?
Jim
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.
Have you actually received the heads ???
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.
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?
Just curious how you know how much porting you can safely do on your heads Art. Have you got cross sections, xrays?
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.
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.
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
FWIW, there is .800" of solid aluminum, above the intake ports. There is a reason this bare head weighs 27lbs. roverman.
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.
That is a surprise. I thought it would use a slightly modified V6 porting routine.
Guess not.
Jim
"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.
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.