garygnu

any one know the flow numbers for TFS 220cc cast head?

SOMbitch

iTrader: (8)

This is straight from TFS >>>>Airflow Chart for GenX Fast As Cast Cylinder Heads
Lift Value Intake Flow CFM Exhaust Flow CFM
0.100" 67 47
0.200" 133 104
0.300" 211 167
0.400" 261 202
0.500" 292 222
0.550" 299 229
0.600" 305 233
Tests conducted at 28" of water (pressure);
CNC profiled chambers; exhaust with 17⁄8" pipe.



You can run the 235cc program through it but you will have to change valves.

chrs1313

iTrader: (24)

they are some great heads for the money...I have seen nothing but good things about them...

garygnu

how close dose a fast 92 intake runner match up to the TFS 220 intake port?

chrs1313

iTrader: (24)

the 215 fit like crap...not sure on the cast ones though

SOMbitch

iTrader: (8)

Did you port match yours chrs???

chrs1313

iTrader: (24)

I posted some pictures in a thread I made...I ended up using a viton sheet of 3/16" thick and waterjet cut to the port geometry to shim up the intake so it has a better transition...so now I have 8 gaskets that need to be glued to either the head or intake...after that I ported the intake more and took some spots out that looked to be a restriction and matched the ports...something to keep in mind when port matching is the intake likes to move alot and needs to be indexed to the heads...so you can guarantee that when the intake is complete it goes on the heads in the exact spot you ported it too...turned out pretty good hopefully it will get me a few more hp...

garygnu

dose any intakes floors match up good ,or epoxy the answer/

chrs1313

iTrader: (24)

dont use epoxy to smooth out the transition that will not help out the flow into the head much at all...it actually might hurt flow if you are not careful and add to much material in the port...you need to raise the floor of the intake up by shimming it or using a thicker gasket...this will open up more area for the head to flow...

Pretend this is the extreme scenario...the bottom half of the intake port is blocked off by the head (in my case was around .20" actually)...so now your surface area of your intake port is cut in half or 50%...not matter how much epoxy you put in the intake port to fill that huge transition or wall that is created by head you will still have only 50% effective intake port volume...so epoxy will not help much...

the only way to gain that 100% port volume back is to re align the intake by bushing it up or whatever direction is needed so alignment is correct...so focus your attention on that...

remember it is okay if the intake port is bigger than the head port, but not the other way around...so if your intake is larger in all directions to your head you will not gain much of anything from epoxying the transition...

garygnu

I remember your thread on the port alignment ,and the gasket/spacer engineering..020 is not too bad,I always thought the intake should be smaller than the head port.I emailed Vengeance and they said epoxy matching did not show any gains.thanks for all your grate infor and input,it is a good head and I can afford it but now a days I am more practical.15 yrs ago I would spend $1000 on a carb to gain 5hp over a out of box carb,I have changed for the worst.LBS, lost ***** syndrome.