Go Back  Offshoreonly.com > Technical > General Q & A
Stainless Marine 502 MPI risers work on 500 EFIs? >

Stainless Marine 502 MPI risers work on 500 EFIs?

Notices

Stainless Marine 502 MPI risers work on 500 EFIs?

Old 07-05-2011, 08:06 AM
  #1  
bn
Registered
Thread Starter
 
bn's Avatar
 
Join Date: Oct 2000
Location: Syracuse, NY
Posts: 687
Received 3 Likes on 2 Posts
Default Stainless Marine 502 MPI risers work on 500 EFIs?

I have a set of stainless marine exhaust and risers on my 502 MPIís. I had water in the oil in both motors. Heads, block, manifolds, etc all checked out ok with no leaks. They are both being completely rebuilt and converted into stock 500 EFIs. I have read that some people have resolved reversion issues by extending the risers. My mechanic wants to weld 10Ē more pipe and extend the exhaust tube. Stainless Marine said these risers wonít work on 500 EFIs and that extending them wonít help. Anyone know if these will work on 500 EFIs or if I can extend the risers and if not, why not?

The cams are Crane Cams part number 169621 with copper plated cores.
Attached Thumbnails Stainless Marine 502 MPI risers work on 500 EFIs?-img_0372.jpg   Stainless Marine 502 MPI risers work on 500 EFIs?-img_0373.jpg  
bn is offline  
Old 07-05-2011, 08:52 AM
  #2  
Registered
 
Join Date: Apr 2010
Location: Lake Texoma, OK
Posts: 417
Likes: 0
Received 0 Likes on 0 Posts
Default

I don't want to sound like a S**** A**. but it sounds like SM already answered your question.
Thunderstruck27 is offline  
Old 07-05-2011, 09:09 AM
  #3  
bn
Registered
Thread Starter
 
bn's Avatar
 
Join Date: Oct 2000
Location: Syracuse, NY
Posts: 687
Received 3 Likes on 2 Posts
Default

Originally Posted by Thunderstruck27
I don't want to sound like a S**** A**. but it sounds like SM already answered your question.
Understand, but at $950 for each riser X's 4, I need a second opinion. Adding 10 inches seems like it would eliminate the possibility of reversion and I have read other threads where this worked.

Just looking for others that may have experience with this.
bn is offline  
Old 07-05-2011, 09:17 AM
  #4  
Registered
 
Join Date: Jul 2009
Location: Newburgh, IN/Grand Rapids, MI
Posts: 550
Likes: 0
Received 20 Likes on 10 Posts
Default

I had a set of IMCO Power Flow's on my 502 with short risers, added 8" to the risers and still got the oil milkshake, i did a lot or research and one thing i find out was that at some point in time cracks in the water jacket were an issue. Mine even passed a pressure check but when they did a pressure check with water the failure appreared...cracks in the water jacket. Mine were 13 years old so that may have been the reason mine failed.
bigredbaja is offline  
Old 07-05-2011, 09:08 PM
  #5  
bn
Registered
Thread Starter
 
bn's Avatar
 
Join Date: Oct 2000
Location: Syracuse, NY
Posts: 687
Received 3 Likes on 2 Posts
Default

Is there any way to test the risers for leaks? I tested the manifold by capping off the hose going to the risers.
bn is offline  
Old 07-06-2011, 01:19 AM
  #6  
Registered
 
Join Date: Jan 2004
Location: Tennessee
Posts: 4,480
Likes: 0
Received 40 Likes on 16 Posts
Default

The only way is to just flow water through them. You can't really build any pressure though. You can try stuffing rags in the outlets to slow the water a little but that's about it.
Eddie
Young Performance is offline  
Old 07-06-2011, 08:07 AM
  #7  
Registered
 
Join Date: Apr 2010
Location: Lake Texoma, OK
Posts: 417
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by bn
Understand, but at $950 for each riser X's 4, I need a second opinion. Adding 10 inches seems like it would eliminate the possibility of reversion and I have read other threads where this worked.

Just looking for others that may have experience with this.
Understood...I hope you can find a fix!
Thunderstruck27 is offline  

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


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.