Well i figured i should toss in my engine build specs and maybe help educate some people on what goes into a build like this.
Block is a 97-98 out of a TJ
Deck Height after leveling things off: 9.446"
Edelbrock head w/ over sized valves
Pistons
Bore: 3.905"
Compression Distance: 1.375"
Dish: 31CC with valve reliefs
Rings (Total Seal): top 1/16" AP steel gap-less, Second 1/16" gapped molly coated, Oil Ring 3/16" standard tension
Crank: Scat 258 4 CW 3.895"
Connecting Rods: Scat 6.125"
Piston top should be about 0.015" above the block deck. Depending on what the combustion chamber volume is after cleaning up the head i'll pick my head gasket thickness.
Estimated static CR is 8.5:1 with a head volume of 60cc (55cc from factory) and a 0.050" head gasket. I went with a gap less ring to help keep all that pressure in the combustion chamber. I chose to use an AP steel ring because it can handle big boost and can resist a little abuse from detonation.
Cam Shaft: Comp Cam 68-235-4 ish
Duration: 253/261
Lift @ Valve: 0.477/0.493 (w/1.6 rockers)
Separation: 113 Deg
Intake Center Line: 107 Deg
Overlap: 31 deg (overlap @ 0.050 lift should be almost non existent)
Rockers: Harland Sharp rollers 1.7:1 (0.507/0.524 lift)
Given that the intake on this cam closes 54 Deg after BDC i only have and effective stroke of 3.298". without boost i'll have a dynamic compression ratio of 7.3:1. with boost (10psi) it will sit around 12.3:1.
To feed this monster i'm using an Eaton M112 off of a 2003 Mustang SVT. For every rotation it pumps out 112ci of air assuming 100%VE. The crank pulley is 7.2" and the blower pulley is 3". Based on VE charts i found on the good old interweb at 2000RPM i'll be at 5 psi boost and wont hit 10psi till about 3500-4000RPM. The cool thing about this blower is it has an internal bypass valve. if the boost exceeds max psi it opens a path that connects the high and low pressure sides. Another added bonus to this valve is that if there is enough vacuum behind the TB (between the TB and the blower inlet) it will open the bypass valve. this will minimize the power needed to roll the blower during low load/idle.
now with all that air and my dynamic CR being what it is under boost..... i'll be running water meth injection thats boost referenced. Once i build over 5-6psi boost it will start adding some liquid love to keep detonation down.
seems pretty crazy but if it all comes together it should have wild bottom end torque and get ok mileage for being a 400hp rolling brick lol....
Topic: 2005 LJ Rubicon Revival (Read 17718 times)