Go Back  Offshoreonly.com > Technical > Do It Yourself, Boating on a Budget
motors running way too fat, >

motors running way too fat,

Notices

motors running way too fat,

Old 05-05-2021, 10:58 PM
  #21  
Registered
iTrader: (1)
 
Join Date: Jun 2009
Location: Chicago
Posts: 7,191
Received 1,670 Likes on 433 Posts
Default

You add powervalves it`s just going to make it richer.
ICDEDPPL is offline  
Old 05-05-2021, 10:59 PM
  #22  
Platinum Member
Platinum Member
Thread Starter
 
flashgordon's Avatar
 
Join Date: Sep 2012
Location: new baltimore mi
Posts: 433
Received 17 Likes on 14 Posts
Default

Originally Posted by fbc25el View Post
Are there little brass tubes sticking out in side of the throttle bores ? Also the three little holes on top by the vent tubes is one of them blocked off ?


these holes???
flashgordon is offline  
Old 05-06-2021, 03:33 AM
  #23  
Registered
 
Join Date: Jul 2017
Location: Bradenton, Fl.
Posts: 175
Received 20 Likes on 11 Posts
Default

Are both carburetor setup the same? PV and jetting? If not.....

The fuel mixture looks too rich. Reduce the jetting size or increase the power valve to
a higher factor to prevent it from opening too soon.

Also, look for leaking needle and seat in carb and excessive fuel pressure.
AmiableDave is offline  
Old 05-06-2021, 06:06 AM
  #24  
Registered
 
Join Date: Feb 2005
Location: cincinnati,oh.
Posts: 482
Likes: 0
Received 16 Likes on 11 Posts
Default

They list as 3 circuit 1050 cfm. 3 circuit do not work well in a boat app. You can convert them to 2 circuit but I don't know how much you want to git in to.
fbc25el is offline  
The following users liked this post:
Griff (05-06-2021)
Old 05-06-2021, 06:22 AM
  #25  
Registered
 
Join Date: Jul 2007
Posts: 2,697
Received 378 Likes on 237 Posts
Default

Originally Posted by flashgordon View Post


i dont know if this helps,,,stamped on top side of carb....
You have Holley 9375's.. the faint stamping below the "9375" ( as though you were reading it right side up) is the date code

https://www.holley.com/products/fuel...parts/0-9375-1
speicher lane is offline  
Old 05-06-2021, 08:44 AM
  #26  
SB
Registered
iTrader: (1)
 
Join Date: Nov 2004
Location: On A Dirt Floor
Posts: 11,146
Received 887 Likes on 373 Posts
Default

Decent thread, for those that Atleast semi understand carbs, on the older list 9375ís (prob the OPís carb) .
https://www.speed-talk.com/forum/vie...php?f=1&t=9934
SB is offline  
Old 05-06-2021, 11:17 AM
  #27  
Platinum Member
Platinum Member
Thread Starter
 
flashgordon's Avatar
 
Join Date: Sep 2012
Location: new baltimore mi
Posts: 433
Received 17 Likes on 14 Posts
Default

Originally Posted by AmiableDave View Post
Are both carburetor setup the same? PV and jetting? If not.....

The fuel mixture looks too rich. Reduce the jetting size or increase the power valve to
a higher factor to prevent it from opening too soon.

Also, look for leaking needle and seat in carb and excessive fuel pressure.
hello dave,,i beleive both carbs are set up same,,guess i will add to list to check....
both motors run tooooo fat...everything on motors are same ..msd..cams ..etc...
and the PV are blocked...
so i guess i need to see what my vacum is at idle and base PV from that ...correct???
thanks for advice.........also want to get a wideband o2 senor set up.....but O2 senors can not get wet correct????
no sure where i can mount it...
thanks again
flashgordon is offline  
Old 05-06-2021, 11:19 AM
  #28  
Platinum Member
Platinum Member
Thread Starter
 
flashgordon's Avatar
 
Join Date: Sep 2012
Location: new baltimore mi
Posts: 433
Received 17 Likes on 14 Posts
Default

Originally Posted by fbc25el View Post
They list as 3 circuit 1050 cfm. 3 circuit do not work well in a boat app. You can convert them to 2 circuit but I don't know how much you want to git in to.
how do i change to a 2 circuit???

thanks for advice
flashgordon is offline  
Old 05-06-2021, 11:26 AM
  #29  
Platinum Member
Platinum Member
Thread Starter
 
flashgordon's Avatar
 
Join Date: Sep 2012
Location: new baltimore mi
Posts: 433
Received 17 Likes on 14 Posts
Default

Originally Posted by F-2 Speedy View Post
are you running stainless tails ? hard to see in the pic, if so you can have bungs welded into them, moving to a #7 might help
hello speedy,,,,,the O2 sensor can not get wet , correct???
not sure if i can do that with my extension pipes,,,as they are wet.....
i guess ,,i could make them dry dump water out another way ,,,but would the exhaust extensions and tail pieces in transom get to hot????

unless i make new extension pipes and make them like headers...double walled...that would be a fun welding challenge

thanks for advice
flashgordon is offline  
Old 05-06-2021, 11:37 AM
  #30  
Platinum Member
Platinum Member
iTrader: (6)
 
F-2 Speedy's Avatar
 
Join Date: May 2012
Location: Midwest & T-Rock
Posts: 8,111
Received 850 Likes on 415 Posts
Default

Originally Posted by flashgordon View Post
hello speedy,,,,,the O2 sensor can not get wet , correct???
not sure if i can do that with my extension pipes,,,as they are wet.....
i guess ,,i could make them dry dump water out another way ,,,but would the exhaust extensions and tail pieces in transom get to hot????

unless i make new extension pipes and make them like headers...double walled...that would be a fun welding challenge

thanks for advice
no it cant get wet, if your tail pipes are not jacketed you cant add bungs in them
F-2 Speedy is offline  

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.