Hi Folks,
Just reworked the exhaust on my Dart which has a very mild 318 in it:
Machine work by Dick Ott, Assembly by Joshua Skinner:
- 0.030" Over 318 (322.5 Ci).
- Steel Crank, Stock Rods, KB Flat Top
- Pistons set to 0 Deck Hight.
- Edlebrock LD4B Intake/750 CFM 4160 Holley.
- Stock "302"/"swirl port" late 318 Heads.
- Stock '66 273 Manifolds/3" single exhaust.
- About 10.5:1 Compression (155 Psi cranking pressure
indicates its more like 9.5:1).
- Mechanical Cam by Oregon Cam Grinding, Inc.:
Intake Exhaust
Valve Lift 0.436" 0.436"
Advertised Dur: 2620. 2620.
Dur @ 0.05" Lift: 2190. 2190.
Lobe Sep: 1100.
Intake Center Line: 1060.
- Ran 14.6 sec @ 95 MPH
Got a FAX at work today from MPC showing the results from their SuperFlo
chassis dyno:
Baseline: TTI Headers/X-Pipe/Tune:
RPM HP TQ A/F HP TQ
==== === === ===== === ===
2326 72 164
2520 103 214
2817 12.65 130 243
3024 12.84 145 252
3054 144 247
3229 12.28 158 257
3255 154 249 OLD Peak Torque
3432 12.04 169 259.0 NEW Peak Torque
3501 12.06 172 258.9
3523 165 247
4039 184 240
4041 12.58 194 252
4510 195 227
4550 12.58 207 239
4621 196 222 OLD Peak HP
5046 194 202
5060 12.33 211 219
5341 12.42 212 208 NEW Peak HP
5522 191 181
5536 12.52 211 200
6002 12.54 204 179
6011 187 164
6225 181 153
6272 12.48 198 166
6309 12.47 196 164
===== ===== ===== ===== =====
AVERAGE: 172.2 208.4 12.47 193.7 222.7
Or Graphically: http://users.erols.com/dmapes/DRTDYN02.JPG
Old exhaust (Baselinr) was factory 66 A-body 273 Manifolds, Y-Pipe,
and 3" single exhaust with a glass pack and a turn-down just ahead
of the rear axle under the car, new exhaust is TTI step headers, 3"
in/2.5" out X-Pipe, dual 2.5" glass packs dumping out from under the
car just ahead of the rear wheels. Tuning changes on the dyno were
the following: Ignition: started at 36* total, ended up at 38* total;
Carb: started with 72 mains in the primarys, 76 mains in the secondarys
and a plug in the secondary power valve well in the metering block;
ended up with a secondary power valve and 68 mains all around. Based
on the A/F I could probably drop another jet size all around, but it
was a bad air day. The dyno operator said the new exhaust sounds
really mean on the dyno under load.
All the Best! Dave
Sr. Software Engineer/Requirements Manager/Systems Assurance Analyst
Aging Racer & Thumb Pound...er...Rule Engineer
http://www.lamehorseracing.com
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