How to make a gen V 502 MPI + $5K = 600 dependable HP?
12-12-2003 | 06:18 PM
#1
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From: SLC, Utah
How to make a gen V 502 MPI + $5K = 600 dependable HP?
Looking for some idea's for my winter project boat. My buget is about $5K on the motor and I'd like to end up between 550-600 dependable HP. The motor has an unknown history other than- its a freshwater running 95 Merc. 502 mpi Gen V with approx 420 hrs. I'll have it leaked down next week and plug it into the scan tool as well.
Would love to just throw a Whipple on it and be done but with the hours and unknown history I'm afraid it wouldn't live.
Thought about maybe selling the motor and going with a 509 or 540N/A motor. Any idea what the motor would be worth?
Any ideas or suggestions would be appreciated
Would love to just throw a Whipple on it and be done but with the hours and unknown history I'm afraid it wouldn't live.
Thought about maybe selling the motor and going with a 509 or 540N/A motor. Any idea what the motor would be worth?
Any ideas or suggestions would be appreciated
12-12-2003 | 07:14 PM
#2
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From: Plano (Dallas), Texas
Check out Tyler Crocket I actually have my ECU's going to him to be reprogrammed to go along with my engine rebuilds.
http://www.crockettmarineengines.com/about.html
He has done some great things with the 502's. Also look at this thread. http://www.offshoreonly.com/forums/s...=tyler+crocket
http://www.crockettmarineengines.com/about.html
He has done some great things with the 502's. Also look at this thread. http://www.offshoreonly.com/forums/s...=tyler+crocket
12-13-2003 | 09:56 AM
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From: Spicewood, Texas USA
I think you can get the HP in the low 500's with the MPI for that amount of money. Freshen the engine, bowl blend and larger valves in the heads, cam change, reprogram the ECU, new fuel pump and good exhaust. To get near 600HP you'd have to ditch the MPI and go to a good intake/carb or aftermarket EFI and a more radical hydraulic roller cam. The Merc EFI makes good low end torque but becomes a bottle neck at the higher RPM needed to get more HP.
12-13-2003 | 11:23 AM
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Originally posted by bobl
I think you can get the HP in the low 500's with the MPI for that amount of money. Freshen the engine, bowl blend and larger valves in the heads, cam change, reprogram the ECU, new fuel pump and good exhaust. To get near 600HP you'd have to ditch the MPI and go to a good intake/carb or aftermarket EFI and a more radical hydraulic roller cam. The Merc EFI makes good low end torque but becomes a bottle neck at the higher RPM needed to get more HP.
I think you can get the HP in the low 500's with the MPI for that amount of money. Freshen the engine, bowl blend and larger valves in the heads, cam change, reprogram the ECU, new fuel pump and good exhaust. To get near 600HP you'd have to ditch the MPI and go to a good intake/carb or aftermarket EFI and a more radical hydraulic roller cam. The Merc EFI makes good low end torque but becomes a bottle neck at the higher RPM needed to get more HP.
12-13-2003 | 02:02 PM
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From: SLC, Utah
Originally posted by bobl
I think you can get the HP in the low 500's with the MPI for that amount of money. Freshen the engine, bowl blend and larger valves in the heads, cam change, reprogram the ECU, new fuel pump and good exhaust. To get near 600HP you'd have to ditch the MPI and go to a good intake/carb or aftermarket EFI and a more radical hydraulic roller cam. The Merc EFI makes good low end torque but becomes a bottle neck at the higher RPM needed to get more HP.
I think you can get the HP in the low 500's with the MPI for that amount of money. Freshen the engine, bowl blend and larger valves in the heads, cam change, reprogram the ECU, new fuel pump and good exhaust. To get near 600HP you'd have to ditch the MPI and go to a good intake/carb or aftermarket EFI and a more radical hydraulic roller cam. The Merc EFI makes good low end torque but becomes a bottle neck at the higher RPM needed to get more HP.
When you say "freshen the engine" what exactly do you mean and what should it cost. It seems to be a pretty nebulous term that ranges from a new plugs to a complete rebuild.
12-13-2003 | 02:10 PM
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From: SLC, Utah
Originally posted by KCHOTBOAT
Bore and stroke your 502 for a 540. I did one with buying a new 502 block for less than 5 grand.
Bore and stroke your 502 for a 540. I did one with buying a new 502 block for less than 5 grand.
