Ok, putting up a couple of interesting builds that I thought would be worth having a GTH game with. Waiting on lifters for one and waiting on the motor plate and pump for the other, but they will be dyno'd hopefully within the next couple weeks. I'll do a game for each. Same rules, closest without going over on corrected horsepower gets some goodies. I got some shirts in a few weeks ago, so I'm planning for that to be the prize.
So several months ago I built a 447 using some Trick Flow heads, Scat crank, Scat rods, Mahle pistons, hydraulic roller, Performer RPM, etc. The results are here:
http://fepower.net/simplemachinesforum/index.php?topic=8595.0The build for game #1 is essentially the exact same engine, except for a few minor cam changes. On the 447 from April, I used a 231/239 @ .050", 114 LSA, 105 ICL, .630" lift.
On this build, I used a 231/235 @ .050", 113 LSA, 105 ICL, .630".
As you can see, the duration split was cut down, which decreases overlap, but the LSA was tightened up one degree to keep the overlap exactly the same as the cam from the engine from April.
What do you think will happen? This is essentially the only variable between the two engines, except for the 445 vs 447 displacement. All-in-all though, the 2ci difference should only net a 2-ish hp change. Same compression ratio, same intake manifold with divider modification, same oil pan, same block prep, same lifters, same spring pressures, same rocker arms, same oil pump, same clearances, same ignition, same pushrods, same carburetor, etc, etc.
Just as a recap:
*4.080"/4.250" bore and stroke
*Scat 9000 series 4.250" crankshaft
*Scat 6.700" I-beam rods
*Mahle dished pistons with 1/1/2mm ring pack
*OOTB Trick Flow cylinder heads
*Performer RPM intake with no port match, but divider modification
*Quick Fuel HR-780 carb
*Custom Lykins Motorsports hydraulic roller, 231/235 @ .050", 113 LSA, .630" lift, 105 ICL
*Lykins Motorsports non-adjustable roller rocker arms with POP stands/spacers/etc.
*MSD distributor
*Will not be turning accessories on dyno
