Hey guys,
Recently built a 496 stroker and had it placed on the engine dyno! The details:
289 - 2 bolt block
Molnar forged crank, and forged Molnar H beam Rods
MAHLE PowerPak 18cc Dome pistons
Straub 229/241 hydraulic roller cam
Johnson BBR-2112 roller lifters
ATI Super Damper
Moroso oil pan and oil pump
Brodix RaceRite 270cc Oval port heads with CnC Chambers
CompCams Ultra Pro Magnum Roller Rockers
Smith Bros Pushrods
Edelbrock 7561 air gap intake
Pro Systems 850 cfm custom carb
The rotating assembly was machined and balanced through Mike Lewis, who was exceptional to work with! Highly recommend! With the Molnar Crank and Rods, i had to use HX and HXN Clevite bearings leaving final clearances of .0025 on the mains, and .0027 on the rods.
With the Brodix Race Rite heads; i didn't have a single issue. Brodix provided a longer rocker arm stud, amazing CNC port work, and installed the locators, and upgraded valve guides. AMAZING job!
Last week, the motor was placed on the dyno in Northern Iowa (Horsepower Dynamics), and made 560hp, and 640 ft. lbs of torque! Max tq was made at 3900 rpm, carrying well over 600 ft lbs beginning at 2700 rpm! The motor maxed out hp at around 5500 rpm, but still provided impressive numbers! The motor was set at 35* of timing.
The only concerning part of the motor, was the oil pressure. On initial start up, the motor carried 40psi of oil pressure at idle, and 60psi while revving. a 22175 moroso pump with a 60lb blue spring was used. Once warmed, the motor carried 17-20psi at idle, and maxxed out at 45psi at 5700 rpm. I believe my clearances are good to go, but i'm bleeding off pressure somewhere in the motor, believed to be the lifter bores, but unsure.
The dyno owner (who is a stock car racer) used a "whistler" machine to test the compression ratio, revealing 9.4:1. Not sure how accurate it was, as the block was decked leaving the pistons .009 in the hole, and a .039 thick head gasket used. I had calculated closer to 10:1.
The owner of the dyno stated his dyno read numbers a little on the low side, but thankfully I didn't care what it made. The feeling of having a motor broke in, leaks identified, and timing/tuning established before installing the motor in the car made it all worth it!
The motor was installed with Moroso Solid Motor Mounts, and is accompanied by a Tremec TKX, Quicktime RM-6022 scattershield, and Mcleod RST dual disc clutch with the American Powertrain hydraulic throwout bearing kit. The transmission needed to be spaced exactly .125" away from the bellhousing as clearances were to tight, and left a gap of .175! The clutch functions beautifully, and is a much easier pedal feel compared to my previous RAM single disc clutch setup. This car is an absolute tire annihilator now, and I love it!
I just wanted to post this thread to provide insight incase another member wanted to build a motor with a similar setup!
Recently built a 496 stroker and had it placed on the engine dyno! The details:
289 - 2 bolt block
Molnar forged crank, and forged Molnar H beam Rods
MAHLE PowerPak 18cc Dome pistons
Straub 229/241 hydraulic roller cam
Johnson BBR-2112 roller lifters
ATI Super Damper
Moroso oil pan and oil pump
Brodix RaceRite 270cc Oval port heads with CnC Chambers
CompCams Ultra Pro Magnum Roller Rockers
Smith Bros Pushrods
Edelbrock 7561 air gap intake
Pro Systems 850 cfm custom carb
The rotating assembly was machined and balanced through Mike Lewis, who was exceptional to work with! Highly recommend! With the Molnar Crank and Rods, i had to use HX and HXN Clevite bearings leaving final clearances of .0025 on the mains, and .0027 on the rods.
With the Brodix Race Rite heads; i didn't have a single issue. Brodix provided a longer rocker arm stud, amazing CNC port work, and installed the locators, and upgraded valve guides. AMAZING job!
Last week, the motor was placed on the dyno in Northern Iowa (Horsepower Dynamics), and made 560hp, and 640 ft. lbs of torque! Max tq was made at 3900 rpm, carrying well over 600 ft lbs beginning at 2700 rpm! The motor maxed out hp at around 5500 rpm, but still provided impressive numbers! The motor was set at 35* of timing.
The only concerning part of the motor, was the oil pressure. On initial start up, the motor carried 40psi of oil pressure at idle, and 60psi while revving. a 22175 moroso pump with a 60lb blue spring was used. Once warmed, the motor carried 17-20psi at idle, and maxxed out at 45psi at 5700 rpm. I believe my clearances are good to go, but i'm bleeding off pressure somewhere in the motor, believed to be the lifter bores, but unsure.
The dyno owner (who is a stock car racer) used a "whistler" machine to test the compression ratio, revealing 9.4:1. Not sure how accurate it was, as the block was decked leaving the pistons .009 in the hole, and a .039 thick head gasket used. I had calculated closer to 10:1.
The owner of the dyno stated his dyno read numbers a little on the low side, but thankfully I didn't care what it made. The feeling of having a motor broke in, leaks identified, and timing/tuning established before installing the motor in the car made it all worth it!
The motor was installed with Moroso Solid Motor Mounts, and is accompanied by a Tremec TKX, Quicktime RM-6022 scattershield, and Mcleod RST dual disc clutch with the American Powertrain hydraulic throwout bearing kit. The transmission needed to be spaced exactly .125" away from the bellhousing as clearances were to tight, and left a gap of .175! The clutch functions beautifully, and is a much easier pedal feel compared to my previous RAM single disc clutch setup. This car is an absolute tire annihilator now, and I love it!
I just wanted to post this thread to provide insight incase another member wanted to build a motor with a similar setup!
