525sc dominator 1050 carb question
#1
Registered
Thread Starter
Join Date: Aug 2010
Posts: 322
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
I need to know if the stock 525sc gen 6 carb (dom 1050) are already boost reference? I dont know how to determine if it is or not boost reference.
Also what is the right procedure to determine if you have the right PV on a boat engine?
Also what is the right procedure to determine if you have the right PV on a boat engine?
#3
Registered
Join Date: Aug 2005
Location: Between A Womans Leggs in IL
Posts: 6,306
Likes: 0
Received 1 Like
on
1 Post
![Default](/forums/images/icons/icon1.gif)
also see if it has 3 air bleade jets per ventury or 2 air bleeder jets..
#4
Charter Member # 55
![](https://www.offshoreonly.com/forums/images/icons/charter_member_star.gif)
![Default](/forums/images/icons/icon1.gif)
Not boost referenced and I don't feel its needed for them. They run like an efi when properly adjusted.
The stock 6.5PV's work just fine in them. I had a bigger roller cam and was running almost 8# of boost and it idled and ran perfect.
The stock 6.5PV's work just fine in them. I had a bigger roller cam and was running almost 8# of boost and it idled and ran perfect.
#5
Registered
Thread Starter
Join Date: Aug 2010
Posts: 322
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
I will take some A/f ratio # this week end see if i am ok
#6
Registered
Join Date: Nov 2001
Location: Pennsylvania
Posts: 3,385
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
That is for an upgrade 525sc with aluminum and b&m 250 blower and now i am in tuning of that engine and dont know if it need to have a boost reference carb. What is the right way to test if you have the right power valve?
I will take some A/f ratio # this week end see if i am ok
I will take some A/f ratio # this week end see if i am ok
I also validate with my A/F meter to ensure it is not getting too lean before it opens. Thats the best way to do it.
#7
Registered
![Default](/forums/images/icons/icon1.gif)
If you have a boost/vacuum gage on the dash, note what vacuum you run a cruise speed the select a PV.5-1 in less in vacuum. I run 5-5-5in vacuum at cruise so I run a 4.5in pv.
I also validate with my A/F meter to ensure it is not getting too lean before it opens. Thats the best way to do it.
I also validate with my A/F meter to ensure it is not getting too lean before it opens. Thats the best way to do it.
If you wanna be safe, you can put a 8.5pv. Only way to really check is either have a vaccum gauge under carb, but on top of blower. This is where the PV gets its signal from.
#8
Registered
#9
Registered
Thread Starter
Join Date: Aug 2010
Posts: 322
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
That works ONLY if its boost referenced. The standard 525SC merc is not. Like griff said 6.5PV.
If you wanna be safe, you can put a 8.5pv. Only way to really check is either have a vaccum gauge under carb, but on top of blower. This is where the PV gets its signal from.
If you wanna be safe, you can put a 8.5pv. Only way to really check is either have a vaccum gauge under carb, but on top of blower. This is where the PV gets its signal from.
What calculation +or- of the vaccum # ?
Thanks.
#10
Registered
Join Date: Aug 2005
Location: Between A Womans Leggs in IL
Posts: 6,306
Likes: 0
Received 1 Like
on
1 Post
![Default](/forums/images/icons/icon1.gif)
most boost gauges have a vacume part on the oposite side of the gauge..just install one in your dash to keep a eye on boost pressure..killl 2 birds with one stone..also make sure you have plenty of fuel pressure..at leaste 7 psi..