New Merc 540 replacement engine
09-25-2014 | 07:39 AM
#11
Platinum Member
Joined: Jul 2008
Posts: 931
Likes: 0
From: Little River SC
I'm really curious; to see what the cranks, rods and pistons are. Stamped steel rocker arms and remand cast iron heads? 800 cfm carb, that would explain; 4500-4800 rpms. What is impressive about less than 1 hp per cid and 560 lbs torque for 15k-18k per engine, using Thunderbolt V with knock protection? Doesn't it seem strange Mercruiser, would now offer a engine with a carb and old ignition system after everything they have produced using EFI ?
For the same money, you could stroke you 502, alum heads, have good rocker arms, and install a 2000 cfm TB, install a Holley HP EFI, easily push 700 HP and 700 lbs torque, all with a hydraulic roller.
Just my engine builder 2 cents worth !!!!
For the same money, you could stroke you 502, alum heads, have good rocker arms, and install a 2000 cfm TB, install a Holley HP EFI, easily push 700 HP and 700 lbs torque, all with a hydraulic roller.
Just my engine builder 2 cents worth !!!!
09-25-2014 | 08:55 AM
#13
Registered
Joined: Apr 2006
Posts: 10,042
Likes: 712
From: Toledo Oh
I'm really curious; to see what the cranks, rods and pistons are. Stamped steel rocker arms and remand cast iron heads? 800 cfm carb, that would explain; 4500-4800 rpms. What is impressive about less than 1 hp per cid and 560 lbs torque for 15k-18k per engine, using Thunderbolt V with knock protection? Doesn't it seem strange Mercruiser, would now offer a engine with a carb and old ignition system after everything they have produced using EFI ?
For the same money, you could stroke you 502, alum heads, have good rocker arms, and install a 2000 cfm TB, install a Holley HP EFI, easily push 700 HP and 700 lbs torque, all with a hydraulic roller.
Just my engine builder 2 cents worth !!!!
For the same money, you could stroke you 502, alum heads, have good rocker arms, and install a 2000 cfm TB, install a Holley HP EFI, easily push 700 HP and 700 lbs torque, all with a hydraulic roller.
Just my engine builder 2 cents worth !!!!
The answer is simple... Its a 540, with a decent cam and intake/fuel injection it would make over 520 hp. They already sell a fancy 520 for more $$
With a bunch of torque and a 4600 redline its the perfect motor... for you searay...
09-25-2014 | 09:10 AM
#15
Platinum Member
Joined: Oct 2007
Posts: 2,256
Likes: 21
From: Osage Beach, Missouri - 28mm
09-25-2014 | 09:59 AM
#16
Registered
Joined: Aug 2012
Posts: 2,301
Likes: 405
From: Collierville, TN and Pickwick Lake
I'm really curious; to see what the cranks, rods and pistons are. Stamped steel rocker arms and remand cast iron heads? 800 cfm carb, that would explain; 4500-4800 rpms. What is impressive about less than 1 hp per cid and 560 lbs torque for 15k-18k per engine, using Thunderbolt V with knock protection? Doesn't it seem strange Mercruiser, would now offer a engine with a carb and old ignition system after everything they have produced using EFI ?
For the same money, you could stroke you 502, alum heads, have good rocker arms, and install a 2000 cfm TB, install a Holley HP EFI, easily push 700 HP and 700 lbs torque, all with a hydraulic roller.
Just my engine builder 2 cents worth !!!!
For the same money, you could stroke you 502, alum heads, have good rocker arms, and install a 2000 cfm TB, install a Holley HP EFI, easily push 700 HP and 700 lbs torque, all with a hydraulic roller.
Just my engine builder 2 cents worth !!!!
09-26-2014 | 09:45 PM
#17
Registered
Joined: Jun 2013
Posts: 145
Likes: 0
I'm really curious; to see what the cranks, rods and pistons are. Stamped steel rocker arms and remand cast iron heads? 800 cfm carb, that would explain; 4500-4800 rpms. What is impressive about less than 1 hp per cid and 560 lbs torque for 15k-18k per engine, using Thunderbolt V with knock protection? Doesn't it seem strange Mercruiser, would now offer a engine with a carb and old ignition system after everything they have produced using EFI ?
For the same money, you could stroke you 502, alum heads, have good rocker arms, and install a 2000 cfm TB, install a Holley HP EFI, easily push 700 HP and 700 lbs torque, all with a hydraulic roller.
Just my engine builder 2 cents worth !!!!
For the same money, you could stroke you 502, alum heads, have good rocker arms, and install a 2000 cfm TB, install a Holley HP EFI, easily push 700 HP and 700 lbs torque, all with a hydraulic roller.
Just my engine builder 2 cents worth !!!!
09-29-2014 | 06:53 AM
#20
Gold Member
Joined: Oct 2005
Posts: 11,688
Likes: 216
From: Olmsted Falls,Ohio Marblehead,Oh
My 540's are .030 over (548CI) with extremely mild cams and aluminum heads made cob=coservative 600 hp 660TQ, how can any 540 be only 440 hp? even with stock iron heads would have to make 550 plus and still be reliable.
