Go Back  Offshoreonly.com > Technical > General Q & A
Estimated HP output - Build Sheet attached >

Estimated HP output - Build Sheet attached

Notices

Estimated HP output - Build Sheet attached

Thread Tools
 
Old 05-06-2018, 09:44 AM
  #41  
Registered
iTrader: (1)
 
onesickpantera's Avatar
 
Join Date: Feb 2005
Location: Michigan
Posts: 4,388
Received 21 Likes on 10 Posts
Default

Originally Posted by Tinkerer
That flame arrester isn't big enough for a stock 454.
Well the good news is that's a fast and free test to see if that is a bottleneck!
onesickpantera is offline  
Old 05-06-2018, 02:43 PM
  #42  
Registered
iTrader: (7)
 
Join Date: Feb 2009
Location: NW Michigan
Posts: 8,302
Received 1,493 Likes on 807 Posts
Default

I'd want a 8x3 minimum but ya a quick on and off run tell the tale in a matter of minutes.
getrdunn is offline  
Old 05-06-2018, 05:42 PM
  #43  
Registered
iTrader: (1)
 
Join Date: Oct 2013
Location: SF Bay Area
Posts: 2,886
Received 143 Likes on 95 Posts
Default

My flame arrestor flowed enough and it actually ran worse without it as it seemed to straiten and settle the air going in. What was eye opening was cracking the hatch and gaining some solid rpm. The afr didn’t change at all, but the engine was thirsty for better air and more of it.
Baja Rooster is offline  
Old 05-06-2018, 05:55 PM
  #44  
Registered
iTrader: (3)
 
Join Date: Jul 2004
Location: chicago
Posts: 11,332
Received 71 Likes on 39 Posts
Default

Originally Posted by Baja Rooster
My flame arrestor flowed enough and it actually ran worse without it as it seemed to straiten and settle the air going in. What was eye opening was cracking the hatch and gaining some solid rpm. The afr didn’t change at all, but the engine was thirsty for better air and more of it.
its shocking how many boats are out there with stock setups starving for fresh air in the bilge.
MILD THUNDER is offline  
Old 05-06-2018, 07:50 PM
  #45  
Registered
iTrader: (7)
 
Join Date: Feb 2009
Location: NW Michigan
Posts: 8,302
Received 1,493 Likes on 807 Posts
Default

Not to say that various boat manufactures are light on ventilation but then we increase the power by 30 to 50% and in some cases double from stock and then only compounds the problem. More vents in the right places the better. Rob the squirrel cage from your furnace and mount it under your rear seat and with a little rigging and converter... whalaa... lol, get that hot air out of there. I use to be know for leaving my blowers on intentionally!
getrdunn is offline  
Old 05-07-2018, 08:53 PM
  #46  
Registered
Thread Starter
 
Join Date: May 2014
Location: Buffalo NY
Posts: 206
Likes: 0
Received 3 Likes on 2 Posts
Default

The flame arrestors are that bad?

Again, I didn't do the build, so I've got some work ahead of me. Am I better off running with the hatch open a little, or arrestors off? - both? Maybe just worm clamp a screen over them for trial?
AWOL is offline  
Old 05-07-2018, 10:52 PM
  #47  
Registered
iTrader: (4)
 
Rookie's Avatar
 
Join Date: Jan 2003
Location: Grand Rapids, MI
Posts: 5,699
Received 1,207 Likes on 580 Posts
Default

Pull the arrestors and try it. Then open the hatch a little after baseline without arrestors is established.
Rookie is offline  
Old 05-09-2018, 07:28 PM
  #48  
Registered
iTrader: (1)
 
onesickpantera's Avatar
 
Join Date: Feb 2005
Location: Michigan
Posts: 4,388
Received 21 Likes on 10 Posts
Default

Originally Posted by Rookie
Pull the arrestors and try it. Then open the hatch a little after baseline without arrestors is established.
X2 . Easy and free.
onesickpantera is offline  
Old 05-14-2018, 03:14 PM
  #49  
Registered
Thread Starter
 
Join Date: May 2014
Location: Buffalo NY
Posts: 206
Likes: 0
Received 3 Likes on 2 Posts
Default

Boat was delivered, and I looked at the hardware in more detail.

Holley 800CFM, jetted to Starboard P: 81 Port P: 81
Starboard S: 95 Port S: 95
3.5 Power Valve
AWOL is offline  
Old 05-14-2018, 07:58 PM
  #50  
Registered
iTrader: (4)
 
Rookie's Avatar
 
Join Date: Jan 2003
Location: Grand Rapids, MI
Posts: 5,699
Received 1,207 Likes on 580 Posts
Default

I'm no carb expert, but that seems fat. Maybe a lot of HP on the table .
Rookie is offline  


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.