Time to share my results, this site is a great resource for information and inspiration.
Road only car, 79 Sundowner Panno.
Previous mechanical cam/follower wipe out led me to chase potential reliability of a roller set up.
Getting hold of a non-race cam is the hard part! Kennely Cams in New Zealand came to the rescue, custom profile on steel blank.
Application of some modern tech to the old pinto as an alternative to a modern engine conversion.
Top end:Bottom end:
- Kennely roller cam, inlet 292 (239@050) 12mm lift, exhaust 282 (239@050) 12mm lift.
- U.S. pinto roller followers.
- Valves 44.4mm & 38mm, 7mm stems, small beehive valve springs, custom lash caps.
- Mild porting, inlet port runner Ø36, Exhaust std size square outlet.
- 11:1 C.R.
External:
- Crower Sportman rods 137mm long.
- Cast light weight pistons, 22mm pins, 92mm bore.
- Stock crank, doweled steel flywheel.
- Balanced.
- Wet sump with small crank scraper.
I don't have torque figures, but the four plots show advance/retard results, optimised fuel/spark at each run, best result with valve timing as specified, I cant find the result from the final tune, was 134.4 I think.
- Sierra EFI manifold, cold air intake.
- Adaptronic ECU, crank trigger, LS coils, motorcycle spark plugs 12mm with adapters.
- Generic off the shelf 4-2-1 headers (forgot the name, the name tag fell off about five years ago) thermal wrapped, everything nearby was melting.
- 2-1/4" pipe through small hot dog and tri-flow muffer, 2" tail pipe. After many failed attempts to get it quiet enough for road use, the local exhaust shop ran the car on the hoist and tested mufflers until they found one quiet enough, though they suggested it would loose power.
Readings in top gear with 3.54:1 diff, Km/h will be true but rpm is only half of screen value due to wasted spark.
Attachment 82209 Attachment 82210 Attachment 82211
Ignition timing concerned me, other threads suggest 36-38° all in at 3-3.5k, nothing like what mine is.
98 octane, is my C.R. too high?
Cheers
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