Semi-Siamesed Hi-Flo TPI base test
This test compared a ported Edelbrock TPI (p/n 3860) intake base
to a similar base that has had it's runner ports siamesed together about
1.75" into the base, leaving an effective intake runner length thru the
base of about 4.5". The engine was entirely the same, consisting
of a ZZ4 crate motor, AFR190 heads, LT4 HOT cam, and SLP 1-3/4" SS headers.
Porting pictures of the base can be found HERE.
Dynorun.012 was the best previous run after the AFR190 heads were installed
with a regular ported Edelbrock TPI base. Dynorun.015 was the best
run with the semi-siamesed Edelbrock TPI base.
| |
Run012 |
Run015 |
|
|
Run012 |
Run015 |
|
| RPM |
Torque |
Torque |
|
|
HP |
HP |
|
| 3700 |
|
|
|
|
|
|
|
| 3800 |
351 |
327 |
-24 |
|
253.9 |
235 |
-18.9 |
| 3900 |
352.1 |
330 |
-22.1 |
|
261.4 |
238 |
-23.4 |
| 4000 |
347.2 |
332 |
-15.2 |
|
264.4 |
244 |
-20.4 |
| 4100 |
(350.7) |
333 |
-17.7 |
|
273.7 |
253 |
-20.7 |
| 4200 |
346.9 |
335 |
-11.9 |
|
277.4 |
261 |
-16.4 |
| 4300 |
343.6 |
(338) |
-5.6 |
|
281.3 |
270 |
-11.3 |
| 4400 |
339.3 |
337 |
-2.3 |
|
284.2 |
274 |
-10.2 |
| 4500 |
335.8 |
335 |
-0.8 |
|
287.7 |
280 |
-7.7 |
| 4600 |
332.1 |
334 |
1.9 |
|
(290.9) |
285 |
-5.9 |
| 4700 |
324.5 |
330 |
5.5 |
|
290.4 |
291 |
0.6 |
| 4800 |
317.1 |
326 |
8.9 |
|
289.8 |
295 |
5.2 |
| 4900 |
310.8 |
329 |
18.2 |
|
290 |
298 |
8 |
| 5000 |
303.6 |
313 |
9.4 |
|
289 |
299 |
10 |
| 5100 |
293.3 |
310 |
16.7 |
|
284.8 |
299 |
14.2 |
| 5200 |
281.4 |
303 |
21.6 |
|
278.6 |
301 |
22.4 |
| 5300 |
279.2 |
298 |
18.8 |
|
281.8 |
(301) |
19.2 |
| 5400 |
274.3 |
293 |
18.7 |
|
282 |
300 |
18 |
| 5500 |
269.6 |
287 |
17.4 |
|
282.3 |
300 |
17.7 |
| 5600 |
265.9 |
278 |
12.1 |
|
283.5 |
299 |
15.5 |
| 5700 |
264.1 |
273 |
8.9 |
|
286.6 |
298 |
11.4 |
| 5800 |
259.5 |
270 |
10.5 |
|
286.6 |
297 |
10.4 |
| 5900 |
251.8 |
264 |
12.2 |
|
282.8 |
296 |
13.2 |
| 6000 |
243.4 |
259 |
15.6 |
|
278.1 |
295 |
16.9 |
| 6100 |
|
|
|
|
|
|
|
| Avg |
305.97 |
310.17 |
4.21 |
|
280.92 |
283.00 |
2.08 |
The regular Hi-FLO base combo was 1/4-mile tested the
same evening that DynoRun.012 was recorded and data is shown on the left
side below. The semi-siamesed base combo was also dragstrip tested
at the same track, on the evening following the DynoRun.015 test, and data
for that is shown on the right side below.
|
Run 012 |
|
|
|
Run 015 |
| Temp |
68
|
|
|
|
72
|
| Humidity |
38 |
|
|
|
71 |
| Baro |
30.47 |
|
|
|
30.41 |
| |
|
|
|
|
|
| R/T |
0.525 |
|
|
|
0.608 |
| 60' |
1.803 |
|
|
-0.167 |
1.97 |
| 330' |
5.198 |
|
|
-0.224 |
5.422 |
| 1/8 |
8.039 |
|
|
-0.259 |
8.298 |
| Mph |
86.63 |
|
|
1.33 |
85.3 |
| 1000' |
10.491 |
|
|
-0.286 |
10.777 |
| 1/4 |
12.561 |
|
|
-0.301 |
12.862 |
| Mph |
108.96 |
|
|
0.62 |
108.34 |
ALDL Data from 1/4-mile runs above (LHS=Regular ported Edelbrock TPI base; RHS=Siamesed ported Edelbrock TPI base )
(L98 Heads) MiniRam vs (AFR Heads )semi-siamesed
TPI
This test just compares the dynamics of the short-runner intake design
of the MiniRam and the effective short-runner design of siamese'ing the
adjacient ports of the TPI intake base. Since the cylinder heads
used in these two tests are different, they can not be directly compared
for performance.
ALDL Data from Best Semi-Siamesed Base Dyno Run (DynoRun.015)
Last Updated on 5/13/01
By Mike Davis