| dry sumped C4 |
Subject: dry sumped C4 by BrianCunningham on 2008/7/2 16:39:12 Thought you might find this interesting. Most C4 owners have had to resort to mounting the pump up high, he's managed to put it down low. [QUOTE]MarkBychowski, Finally! As some of you know I've been working on gradually building up a new engine over the past year or so. It's finally done and just got the computer tuned yesterday. Here are the details: Engine specs: Shortblock LT1 / 4 small block bore: 4.03" Stroke 3.625" 6.0" rods Static compression 10.96:1 Hydraulic roller cam, specs at .05" lift: Intake duration 230, .622 valve lift Exhaust duration 236, .624 valve lift Lobe separation: 112.0 Installed 108.0 intake center line Caddy racing lifters Oil system: Johnson's 4 stage dry sump pump (3 sunction stages all in the pan) Hamburgers 3 stage dry sump pan with extra scavenge fitting/tube added custom oil tank Canton oil thermostat and earls cooler Intake: Ported LT4 42lb injectors 58mm throttlebody Heads: AFR 210cc LT4 competition ported Other: Trans: ZF6 Clutch: Carolina stage 3 Exotic Muscle headers Corsa exhaust with Carsound 3" Cats Delteq ignition Meziere Electric water pump 180* Thermostat The motor was built for a combination of street and road racing (HPDEs). Shortblock built and cam selection by Midwest engine tech in Mokena, IL. top-end, dry sump, etc was done by me. My HP goals were ~500HP at the crank (~425 RWHP). Overall I'm very pleased with the result, particularly given the 'unknowns' of the AFR Eliminator heads and the practicality of fitting a dry sump system into a street C4 while retaining all accessories (AC, cruise, traction control, etc). That being said, getting it all in there was a massive pain in the butt. Among many other things I had to fab up new solid motor mounts which move the motor 1/4" back to clear the drive mandrel and also clear the oil fittings on the passenger side. No frame or structural mods were made, though. Here are the results: RWHP Dyno graph: [IMG]http://home.comcast.net/~markbychowski/Photos/Final dyno.JPG[/IMG] Engine during assembly showing location of dry sump pump and drive mandrel (you can also see the tank pre-installation in the lower left: [IMG]http://home.comcast.net/~markbychowski/Photos/engine assembly.JPG[/IMG] Oil tank installed in factory battery location (battery is in the rear storage compartment): [IMG]http://home.comcast.net/~markbychowski/Photos/Oil Tank.JPG[/IMG] Engine from driver's side: [IMG]http://home.comcast.net/~markbychowski/Photos/Engine Driver side.JPG[/IMG] Engine from passenger side: [IMG]http://home.comcast.net/~markbychowski/Photos/engine pass side.JPG[/IMG] Dry sump tank breather can and oil pump (it's down there somewhere): [IMG]http://home.comcast.net/~markbychowski/Photos/oil pump.JPG[/IMG] Link to earlier thread with AFR head pics and flow numbers: [url]http://forums.corvetteforum.com/showthread.php?t=1775117[/url] Link to earlier thread with Engine dyno numbers: [url]http://forums.corvetteforum.com/showthread.php?t=1990466[/url][/QUOTE] |
