500 EFI exhaust length required to prevent reversion?
07-07-2011, 11:34 AM
#1
Registered
Thread Starter
500 EFI exhaust length required to prevent reversion?
I know there are a lot of variables including angles, but in general, how much of a run is required for the exhaust before water is introduced to prevent reversion on a 500 EFI?
I am assuming that there must be a formula for this.
I am assuming that there must be a formula for this.
07-07-2011, 03:28 PM
#2
Charter Member # 55
Charter Member
No formula. It can also depend on how the boat sits in the water at idle. 500EFI's never had a problem with reversion and many had the shorter silent choice risers.
07-07-2011, 09:26 PM
#3
Registered
Thread Starter
Now I'm really confused. I have been told that my Stainless Marine risers won't work on my new 500 EFI's. They are the shorter ones. 3" taller than standard.
07-07-2011, 11:42 PM
#4
Charter Member # 55
Charter Member
The cam in the carbed 500HP's were prone to causing reversion. The 500efi cams have less overlap and did not have the issue. Your short risers may be a concern. You could have the inner pipe lengthened or have SM lengthen them.
I would just run it and then check for reversion by pulling the risers and inspecting for water and go from there.
I would just run it and then check for reversion by pulling the risers and inspecting for water and go from there.
