Hey guys, wanted to share a few pics of my project over the past couple of years. Technically, one year piecing the engine together. And it's been exactly a year since I started putting the car together.
I started with the engine, originally for another project. Once it was together I decided to go a completely different route.
So let's start with the engine:
Late 90's BMW 4.4L (M62B44) short block.
Early 90's BMW 4.0L dismantler take out to sacrifice it's heads, cams, OBD1 timing covers and timing chain set up & misc hardware.
Measuring for compression ratio. Found the pistons to have a slight dish to them.
Cylinder heads back from a machine shop rebuild.
Found 52cc of combustion chamber volume.
92mm bore (3.62") x 82.7mm stroke (3.26"), pistons sit .025" above deck and have an estimated 4cc dish. The available head gasket is 1.74mm thick (.069"). By my calc that makes roughly a 9.66:1 static compression.
Timing the cams:
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.
Next post, start building the car.
I started with the engine, originally for another project. Once it was together I decided to go a completely different route.
So let's start with the engine:
Late 90's BMW 4.4L (M62B44) short block.
Early 90's BMW 4.0L dismantler take out to sacrifice it's heads, cams, OBD1 timing covers and timing chain set up & misc hardware.
Measuring for compression ratio. Found the pistons to have a slight dish to them.
Cylinder heads back from a machine shop rebuild.
Found 52cc of combustion chamber volume.
92mm bore (3.62") x 82.7mm stroke (3.26"), pistons sit .025" above deck and have an estimated 4cc dish. The available head gasket is 1.74mm thick (.069"). By my calc that makes roughly a 9.66:1 static compression.
Timing the cams:
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.
Next post, start building the car.