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TFS TW Head Flow Tech by Peter L. Turek
6/7/96 TFS TW heads flow summary and 8/2/96 2nd TFS flow test summary
CFM Chart
---------+--------+--------+--------+--------+--------+--------+--------
Valve | | | | | | |
Lift | .100" | .200" | .300" | .400" | .500" | .600" | .700"
---------+--------+--------+--------+--------+--------+--------+--------
FPS stk | | | | | | |
TFS intk | 61 | 125 | 187 | 226 | 241 | |
---------+--------+--------+--------+--------+--------+--------+--------
DSA stk | | | | | | |
TFS Intk | | | | 233 | 254 | 254 |
---------+--------+--------+--------+--------+--------+--------+--------
1st tst | | | | | | |
TFS Intk | | 120 | 184 | 243 | 267 | 278 | 278
---------+--------+--------+--------+--------+--------+--------+--------
2nd tst | | | | | | |
TFS Intk | | 130 | 182 | 248 | 271 | 288 | 288
---------+--------+--------+--------+--------+--------+--------+--------
CFM comparison FPS stock TFS Intk Vs 2nd porting flow test Intk
CFM Inc. 5 -5 22 30
% Inc. 4.00% -2.67% 9.73% 12.45%
CFM comparison FPS stock TFS Intk Vs DSA stock (not upgraded) TFS Intk
CFM Inc. -7 -13
% Inc. -3.0% -5.1%
------------------------------------------------------------------------
TFS Exhaust test
.100" .200" .300" .400" .500" .600" .700"
---------+--------+--------+--------+--------+--------+--------+--------
Stock | | | | | | |
TFS EX | 58 | 104 | 139 | 166 | 187 | |
---------+--------+--------+--------+--------+--------+--------+--------
1st tst | | | | | | |
TFS EX | | 115 | 134 | 160 | 193 | 210 |
---------+--------+--------+--------+--------+--------+--------+--------
2nd tst | | | | | | |
TFS EX | | 96 | 128 | 152 | 169 | 182 | 194
---------+--------+--------+--------+--------+--------+--------+--------
1st porting flow test vs. FPS stock TFS
------------------------------------------------------------------------
CFM Inc. 11 -5 -6 6
% Inc. 10.58% -3.60% -3.61% 3.21%
2nd prt test vs. stock TFS exhaust
------------------------------------------------------------------------
CFM Inc. -8 -11 -14 -18
% Inc. -7.69% -7.91% -8.43% -9.63%
------------------------------------------------------------------------
Intake-to-Exhaust ratio Chart
---------+--------+--------+--------+--------+--------+--------+--------
| | | | | | |
| .100" | .200" | .300" | .400" | .500" | .600" | .700"
---------+--------+--------+--------+--------+--------+--------+--------
Stk int | | | | | | |
stk ex | 95% | 83% | 74% | 73% | 78% | *80%* |
---------+--------+--------+--------+--------+--------+--------+--------
stk int | | | | | | |
prt-1 ex | | 92% | 72% | 71% | 80% | *87%* |
---------+--------+--------+--------+--------+--------+--------+--------
prt-2 int| | | | | | |
stk ex | | 80% | 76% | 67% | 69% | *84* |
---------+--------+--------+--------+--------+--------+--------+--------
prtd int | | | | | | |
prtd ex | | 88% | 74% | 65% | 71% | 73% |
---------+--------+--------+--------+--------+--------+--------+--------
Notes:
* Asterisk indicates extrapolated flow numbers based on testing other
similar TFS TW heads on the same flowbench.
Probe one-piece swirl-polished waisted stem stainless
valves used, along with 3 angle valvejob. Stock Summit/TFS
supplied heads are not so equipped, and should flow a little
bit less air. However, the FPS heads came with an .080" "ridge"
around the top cut of the head's vavle job which limitied flow
somewhat compared to a stock TFS TW head as evidenced by the
"DSA stock TFS intake" label on the itnbake flow test sheet above.
The "2nd tst TFS intake" on the TFS intake indicates the results of
removing .080" from the top of the short side radius of the intake turn
into the valvejob and a slight reworking of the last 1/2" to 5/8"
of this radius to improve flow. Due to a miscommunication between
P.L.T. and the flowtester, the "wrong" port was tested as this
test reveals only about 1/2 the gains likely with a more radical reshape
of the port's short turn. The "correct" port was not tested as yet
and should have revealed about mid to high 190cfm as a result.
No Combustion chamber work was done to unshroud the intake or exhaust.
The TFS TW responds well to porting of the combustion chamber to
unshroud both the intake and exhaust. This typically is supposed to
reveal about 300cfm intake and 225cfm exhaust with significantly better
lower lift airflow numbers.
Light combustion chamber work was done to remove the "ridge" left
by a vavlejob cutter on the FPS head, which cost a few CFM, but not
a lot. Estimated less than 1cc of chamber material was removed.
The "2nd tst TFS EX" indicated what happened when the TFS exhaust
was given a steeper (tighter radiused) short side turn on the exhaust.
Needless to say, from the numbers above, it didn't like this.
The TFS exhaust wants only mild work, and the short side radius should
be left alone after the valve seat ends into the port.
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