My take on a Hot Rod: Tbucket, BMW v8, Supercharger, Nitrous.
Posted: Mon Aug 19, 2019 8:19 pm
Hey Guys, I wanted to share a few pics of my recent project over the past two years. Technically one year on the engine and one year thus far building the car.
I started putting the engine together for another project, but then decided to go in an entirely different direction once the engine was together.
Late 90's BMW 4.4L V8 short block, pictured with raceware head studs:
Donor early 90's BMW 4.0L V8 to sacrifice it's heads, cams, timing set up, covers and misc hardware:
Is it said that the early 4.0L V8's had bigger cams & bigger valves compared to the later 4.4L's. Heads back from a machine shop rebuild:
Time to figure out this engines static compression ratio:
92mm (3.62") bore x 82.7mm (3.26") stroke, 52cc chambers, +.025" piston height with 4cc dish. 1.74mm (0.69") compressed head gasket thickness. Roughly 9.66:1 static compression ratio
The Supercharger is an Eaton M112 from a late 90's Jaguar, using Jaguar intercoolers and fuel injection sitting on adapters to bolt to the BMW heads.
Using aftermarket cam alignment tools the valve timing events landed at:
@.1mm lift:
Intake opens 12° BTDC / Intake closes 48° ABDC
Exhaust opens 48° ABDC / Exhaust closes 12° ATDC
240°/240° duration -108° intake centerline / 108° lobe separation
@1mm lift:
Intake opens 2° ATDC / Intake closes 33° ABDC
Exhaust opens 33° BBDC / Exhaust closes 7° BTDC
211°/206° Duration - 107.5° Intake centerline / 108.75° lobe separation
When it was all said and done I set up the cams for a 112° ICL and a 110° LSA, retarding the intake cams a bit to lower dynamic compression and aid in keeping the charge in the cylinder by reducing overlap.
Up next. Building the car...
I started putting the engine together for another project, but then decided to go in an entirely different direction once the engine was together.
Late 90's BMW 4.4L V8 short block, pictured with raceware head studs:
Donor early 90's BMW 4.0L V8 to sacrifice it's heads, cams, timing set up, covers and misc hardware:
Is it said that the early 4.0L V8's had bigger cams & bigger valves compared to the later 4.4L's. Heads back from a machine shop rebuild:
Time to figure out this engines static compression ratio:
92mm (3.62") bore x 82.7mm (3.26") stroke, 52cc chambers, +.025" piston height with 4cc dish. 1.74mm (0.69") compressed head gasket thickness. Roughly 9.66:1 static compression ratio
The Supercharger is an Eaton M112 from a late 90's Jaguar, using Jaguar intercoolers and fuel injection sitting on adapters to bolt to the BMW heads.
Using aftermarket cam alignment tools the valve timing events landed at:
@.1mm lift:
Intake opens 12° BTDC / Intake closes 48° ABDC
Exhaust opens 48° ABDC / Exhaust closes 12° ATDC
240°/240° duration -108° intake centerline / 108° lobe separation
@1mm lift:
Intake opens 2° ATDC / Intake closes 33° ABDC
Exhaust opens 33° BBDC / Exhaust closes 7° BTDC
211°/206° Duration - 107.5° Intake centerline / 108.75° lobe separation
When it was all said and done I set up the cams for a 112° ICL and a 110° LSA, retarding the intake cams a bit to lower dynamic compression and aid in keeping the charge in the cylinder by reducing overlap.
Up next. Building the car...