I decided to rebuild my 1999 502 mpi with a side mounted 2.3L whipple to add some extra power. After many discussions with the engine builder (LJ Engines) we decided to do something that I believe has not been done before. He rebuilt the motor to a 540 with only using the engine block. However, to make more power he had to competely change the intake manifold, injectors and throttle body.
We decided to install a Holly intake and still use the the top section of the mercruiser air plenum, so the whipple would still be side mounted. We also added a 2000 cfm throttle body and made some special adapters to accomodate the larger throttle body and brackets to support the weight from the supercharger. The engine goes on the dyno tomorrow and hopefully we make a substantial gain in the HP department. Many hours of machine work and time went into the intake modification and is very unique.
I could of made it easy by buying a updated whipple intercooler and top mount the supercharger. However, I did not want to modify my rear hatch to accomodate the height of the supercharger or pay thousands for a different intercooler.
The following is a list of parts that were included and some photos.
GM 502 BLOCK/4.500 BORE
4340 STEEL CRANK 4.250 STROKE
MANLEY 6.385H-BEAM RODS/ARP2000 BOLT UPGRADE
MAHLE PISTONS
MAHLE/TOTAL SEAL PISTON RINGS
MICH. 77H-SERIES BEARINGS
L&J CUSTOM HYD. ROLLER CAM
MELLING HV OIL PUMP
GM 8QT. MARINE OIL PAN W/WINDAGE TRAY
HD OIL PUMP SHAFT
1 PIECE OIL PAN GASKET
CLOYES TIMING SET/HEX/ADJUST
ATI 7.75 DAMPNER
COMETIC HEAD GASKETS
ARP HEAD STUD KIT
INTAKE GASKET
PUSH RODS/MANLEY PRO
INTAKE VALVES (STAINLESS/MANLEY)
EXHAUST VALVES (INCONELL/MANLEY)
PC SEALS
ROLLER VALVE SPRINGS/ISKY TOOL ROOM
DAMPNER SEAL
ROCKER STUDS/ARP
PUSH ROD GUIDE PLATES/COMP CAM
STEEL 10ΒΊ RETAINERS/MANLEY
10ΒΊ VALVE LOCKS/MANLEY
COMP CAM ROLER ROCKERS
INTAKE PLUNNUM/L&J MODIFIED
RHS/L&J MODIFIED IRON CYLINDER HEADS
OIL COOLER
CRANE HYDRAULIC ROLLER LIFTERS
2.3L WHIPPLE SIDE MOUNT SUPERCHARGER/INTERCOOLER KIT
2000 CFM.BILLET THROTTLE BODY
L&J MODIFIED WHIPPLE THROTTLE BODY ADAPTER
9.2 COMPRESSION
Has anyone heard of this intake modification before?? Anyone want to guess on the HP and torque?
More photos
I would like to know how your dyno went, i just built a 540 using the ASM kit, and it basically uses the stock GM parts. With my size cam being mild but not stock we had (Westec Performance) a bitch of time finally getting the motor to idle.
Mine pulled 605HP 600HP before falling off torque.
LJ Engines has a special cam for this project and he wants to keep the specification private. I don't blame him at all. The motor should dyno around 850hp give or take 25 HP. :idea:
I'll post the HP/Torque amounts and the sheet upon receiving the info.
Very unique combo. Looking good. Will be interesting to see what kind of numbers are generated.
So when is the IMCO, MAX, or TEAGUE drive going on?
I have a new Bravo XR. However, I'm adding a minus 2 inch IMCO lower unit. I'm pretty easy on drives but I know this isn't going to last for long.
I used a stock Bravo 1 with the blown 502 for a couple of years with no problem but decided to upgrade to an XR for insurance reasons. Now with the new motor, I'll have to rethink the outdrive issue. I just want to last until this winter.
Nice looking engine Jeff, let me know when it's all together and we'll meet and see how it runs...
We are going on the test runs hopefully Friday with the engine builder, programmer and rigger. We are going to try different props and see what we can get too. I'll keep you updated...
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