lost power

Automotive powered airboat discussion.
Post Reply
riverdogs352
Southern Airboat Member
Posts: 22
Joined: Tue Jul 21, 2009 5:55 pm

lost power

Post by riverdogs352 » Fri Oct 01, 2010 10:08 pm

took my chevy 350 dd out.it ran great all day and on my way in it lost alot of power but still idles fine and still sounds good when running just dont have the power now.any suggestions what to check first.has new intake and head gaskets.

User avatar
JAMES
Site Supporter - II
Site Supporter - II
Posts: 8569
Joined: Wed Aug 22, 2007 10:31 pm
Location: cocoa
Contact:

Re: lost power

Post by JAMES » Fri Oct 01, 2010 10:24 pm

did the carb take a dump????
https://m.facebook.com/321ccc/?ref=bookmarks Wp383 268 rotator 3 bld WT/EX 14.4 perdator

riverdogs352
Southern Airboat Member
Posts: 22
Joined: Tue Jul 21, 2009 5:55 pm

Re: lost power

Post by riverdogs352 » Fri Oct 01, 2010 11:09 pm

no carbs fine.had a little miss be i readjusted the lifters and dont hear the miss no more but still dont have the power that it did

cowtown
Site Supporter - III
Site Supporter - III
Posts: 1558
Joined: Fri Aug 08, 2008 7:29 pm
Location: Fellsmere,Florida
Contact:

Re: lost power

Post by cowtown » Sat Oct 02, 2010 7:19 am

CHECK THE LIFT ON THE CAM , WITH THE VALVES NOT ADJUSTED CORRECTLY , SBC'S ARE KNOWN TO EAT THE CAM SHAFT
http://usfth.tripod.com

And Proud Of It !!!

User avatar
watersports7
Site Supporter - III
Site Supporter - III
Posts: 2523
Joined: Mon Dec 01, 2008 10:15 am
Location: Cocoa/PSJ/St Johns River

Re: lost power

Post by watersports7 » Sat Oct 02, 2010 9:07 am

cowtown wrote:CHECK THE LIFT ON THE CAM , WITH THE VALVES NOT ADJUSTED CORRECTLY , SBC'S ARE KNOWN TO EAT THE CAM SHAFT
its the fastest 'wearing' part in em'...
12' Predator / Lycoming 4 Cylinder / Old Skool 68x38 Stick Prop
Perfectly said by Lycoming: Some engines purr like kittens. These roar!

User avatar
:)
Site Supporter - I
Site Supporter - I
Posts: 2110
Joined: Thu Jul 08, 2010 8:07 pm
Location: Baker County, Florida
Contact:

Re: lost power

Post by :) » Sat Oct 02, 2010 10:10 am

Yep prolly wiped the lobes out!
14 ft Combee. 4 seater, BPE 383 sb chevy, 2.09 stinger, 3 blade ww stump puller.
"When the people fear their government, there is tyranny; when the government fears the people, there is liberty." Thomas Jefferson

Bdriller
Site Supporter - IV
Site Supporter - IV
Posts: 935
Joined: Fri Sep 24, 2010 9:38 pm
Location: red river below texoma

Re: lost power

Post by Bdriller » Sat Oct 02, 2010 10:14 am

they usually start barking back through carb when when lobes start going.

User avatar
JAMES
Site Supporter - II
Site Supporter - II
Posts: 8569
Joined: Wed Aug 22, 2007 10:31 pm
Location: cocoa
Contact:

Re: lost power

Post by JAMES » Sat Oct 02, 2010 10:22 am

I HAD A FEW MOTORS ACT RIGHT WHEN IDEL AND SOUND GOOD WHAT DO U NO IT WAS EITHER THE FUEL PUMP OR CARB CHECK ALL THE EASY STUFF FIRST GOOD LUCK

LOBE ON THE CAM DO WEAR BUT MAKE SURE U CHECK THE EXT. STUFF BEFORE PULLING IT APART :D
https://m.facebook.com/321ccc/?ref=bookmarks Wp383 268 rotator 3 bld WT/EX 14.4 perdator

Wind Blown
Site Supporter - III
Site Supporter - III
Posts: 265
Joined: Thu Sep 25, 2008 7:11 pm
Location: Lakeland

Re: lost power

Post by Wind Blown » Sat Oct 02, 2010 9:19 pm

My 350 did it about 3 weeks ago. No miss sounded fine it was a hole in the piston.
The only thing I notice different was crankcase pressure.
13x7 DiamondBack-470-3 Blade H

johnnybeeegood
Southern Airboat Member
Posts: 78
Joined: Fri Mar 05, 2010 7:56 am

Re: lost power

Post by johnnybeeegood » Sat Oct 02, 2010 9:55 pm

not really enough info, did it happen all at once? gradually, but im with James easy stuff first , starting with water in fuel, fuel filter or pump.

Bdriller
Site Supporter - IV
Site Supporter - IV
Posts: 935
Joined: Fri Sep 24, 2010 9:38 pm
Location: red river below texoma

Re: lost power

Post by Bdriller » Sun Oct 03, 2010 10:36 am

distributer slip to a retard position

User avatar
grant
Site Supporter - VII
Site Supporter - VII
Posts: 3425
Joined: Sat Jul 29, 2006 12:03 pm
Location: Felda, Florida
Contact:

Re: lost power

Post by grant » Sun Oct 03, 2010 11:05 am

Wind Blown wrote:My 350 did it about 3 weeks ago. No miss sounded fine it was a hole in the piston.
The only thing I notice different was crankcase pressure.
Pay closer attention....and have your hearing checked!! :D :D
"Don't Taze me Bro"

User avatar
JAMES
Site Supporter - II
Site Supporter - II
Posts: 8569
Joined: Wed Aug 22, 2007 10:31 pm
Location: cocoa
Contact:

Re: lost power

Post by JAMES » Sun Oct 03, 2010 9:41 pm

grant wrote:
Wind Blown wrote:My 350 did it about 3 weeks ago. No miss sounded fine it was a hole in the piston.
The only thing I notice different was crankcase pressure.
Pay closer attention....and have your hearing checked!! :D :D
:lol: yea how's that psooible it aint no cadillac :D
https://m.facebook.com/321ccc/?ref=bookmarks Wp383 268 rotator 3 bld WT/EX 14.4 perdator

User avatar
crowhater
Site Supporter - III
Site Supporter - III
Posts: 3490
Joined: Thu Feb 01, 2007 8:47 pm
Location: Conroe Texas

Re: lost power

Post by crowhater » Mon Oct 04, 2010 2:11 pm

Don't guess at it, just pull the plugs do a leak down test. If it is hurt a leak down test will tell you real quick. There are many diffrent things you could have done to loose power, you could have burned the rings, washed the rings, killed the valve springs, killed the cam, etc, etc.
18x8 Alum, 496 BBC, 2.6 CH4, 4B 82" S-blades

filetnrelease
Site Supporter - IV
Site Supporter - IV
Posts: 424
Joined: Tue Jan 08, 2008 6:39 pm
Location: Palm Beach County

Re: lost power

Post by filetnrelease » Mon Oct 04, 2010 10:39 pm

+1 on what Crowhater said... compression test is good info to have as well when trouble shooting
"Whether you think you can or you think you can't, either way you are right" Henry Ford

Post Reply

Return to “Automotive Power Only”