Like Tree0Likes

502 vs 502

Reply
Old 09-29-2013, 01:25 AM
  #1
Registered
Thread Starter
 
Join Date: Sep 2013
My Boats: Sold the boat
Posts: 30
Default 502 vs 502

I know about the older 454 / 7.4 / 502 engine family, with distributor ignition.

Even today I see that MerCruiser offer a 502.
What is that thing, from a technical standpoint?

Michael S is offline  
Reply With Quote
Old 09-29-2013, 10:00 PM
  #2
Platinum Member
Platinum Member
Trade Score: (3)
 
mike tkach's Avatar
 
Join Date: Oct 2007
Location: yorkville,il
My Boats: 31 american offshore,38 fountain fever
Posts: 7,985
Default

according to mercury,s info that engine is 380 hp with a max rpm of 4800.it would be a good low hp engine,but its no hp 525.lol
mike tkach is online now  
Reply With Quote
Old 09-29-2013, 11:51 PM
  #3
Registered
Trade Score: (2)
 
Join Date: Aug 2005
Location: Between A Womans Leggs in IL
My Boats: 77 donzi x18 92 formula 336 sr1
Posts: 6,320
Default

Quote:
Originally Posted by mike tkach View Post
according to mercury,s info that engine is 380 hp with a max rpm of 4800.it would be a good low hp engine,but its no hp 525.lol
........................

Last edited by FIXX; 09-29-2013 at 11:54 PM.
FIXX is offline  
Reply With Quote
Old 09-30-2013, 08:03 AM
  #4
Platinum Member
Platinum Member
Trade Score: (3)
 
MILD THUNDER's Avatar
 
Join Date: Jul 2004
Location: chicago
My Boats: 38 Fountain
Posts: 10,797
Default

They also have the HO version of that. 430HP. Looks like a modern version of the old 502MPI mag engine. I noticed it has 02' sensors in the manifolds, so probably a better EFI version that feedbacks the ecm. Wonder if it has the forged internals like the old mags?
MILD THUNDER is offline  
Reply With Quote
Old 09-30-2013, 08:39 AM
  #5
Forum Regulator
VIP Member
Trade Score: (1)
 
Sydwayz's Avatar
 
Join Date: May 2001
Location: Worldwide
My Boats: 17' Speedliner Cat & O.P.B.
Posts: 21,796
Default

Well, it's not a 525EFI, because they are known to dyno somewhere between 535 and 560 HP right out of the factory

Check out the new 502 520-HP *8.6L* version.
http://www.mercuryracing.com/sterndrives/hp520.php
http://www.mercuryracing.com/blog/loto-520/
Mercury Racing Releases New 520 Engine

Mercury has moved away from the 496 block and now offers 3 versions of the 502 plus the new 8.6L:

8.1L Mag making 380 hp
8.1L Mag H.O. making 420 hp
And there is still the ever popular 525EFI.

Mercury Racing 520 making 520 hp (Edited, this engine is 8.6L; not 8.2L, mah bad.)

Last edited by Sydwayz; 09-30-2013 at 04:59 PM. Reason: corrected info, thanks mike tkach
Sydwayz is offline  
Reply With Quote
Old 09-30-2013, 08:54 AM
  #6
Platinum Member
Platinum Member
Trade Score: (3)
 
mike tkach's Avatar
 
Join Date: Oct 2007
Location: yorkville,il
My Boats: 31 american offshore,38 fountain fever
Posts: 7,985
Default

Quote:
Originally Posted by Sydwayz View Post
Well, it's not a 525EFI, because they are known to dyno somewhere between 535 and 560 HP right out of the factory

Check out the new 502 520-HP version.
http://www.mercuryracing.com/sterndrives/hp520.php
http://www.mercuryracing.com/blog/loto-520/
Mercury Racing Releases New 520 Engine

Mercury has moved away from the 496 block and now offers 4 versions of the 502:

8.1L Mag making 380 hp
8.1L Mag H.O. making 420 hp
Mercury Racing 520 making 520 hp
And there is still the ever popular 525EFI.
thats good information,but not the engine the op asked about and just fyi,the new 520 horse engine isnot a 502,but rather 523 cu in.
mike tkach is online now  
Reply With Quote
Old 09-30-2013, 08:58 AM
  #7
Registered
Thread Starter
 
Join Date: Sep 2013
My Boats: Sold the boat
Posts: 30
Default

So the current 502s now offered are the same old big block GM base engine as the 454/7.4 and old 502?
Michael S is offline  
Reply With Quote
Old 09-30-2013, 09:07 AM
  #8
Platinum Member
Platinum Member
Trade Score: (3)
 
mike tkach's Avatar
 
Join Date: Oct 2007
Location: yorkville,il
My Boats: 31 american offshore,38 fountain fever
Posts: 7,985
Default

not exactly,the 454 and 502 blocks are not the same,and gm is no longer producing them.i believe mercury bought the rites from gm for the 502 blocks,maybe others will have more information on this.
mike tkach is online now  
Reply With Quote
Old 09-30-2013, 09:18 AM
  #9
Registered
Trade Score: (2)
 
Join Date: Aug 2005
Location: Between A Womans Leggs in IL
My Boats: 77 donzi x18 92 formula 336 sr1
Posts: 6,320
Default

Quote:
Originally Posted by MILD THUNDER View Post
They also have the HO version of that. 430HP. Looks like a modern version of the old 502MPI mag engine. I noticed it has 02' sensors in the manifolds, so probably a better EFI version that feedbacks the ecm. Wonder if it has the forged internals like the old mags?
i read somewhere that the new 502 mag is 380 hp at the prop...the 430 number is at the crank..
FIXX is offline  
Reply With Quote
Old 09-30-2013, 05:00 PM
  #10
Forum Regulator
VIP Member
Trade Score: (1)
 
Sydwayz's Avatar
 
Join Date: May 2001
Location: Worldwide
My Boats: 17' Speedliner Cat & O.P.B.
Posts: 21,796
Default

Quote:
Originally Posted by mike tkach View Post
thats good information,but not the engine the op asked about and just fyi,the new 520 horse engine isnot a 502,but rather 523 cu in.
You are absolutely correct. I missed that in my first pass. I guess that speed reading class back in the day isn't good for much. Thanks for the correction & I have edited my post.
Sydwayz is offline  
Reply With Quote
Reply



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 09:56 AM.


Copyright 2011 OffShoreOnly. All rights reserved.