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Tko87 ![]() Groupie ![]() Joined: June-19-2012 Location: Louisiana Status: Offline Points: 59 |
![]() ![]() ![]() ![]() ![]() Posted: April-20-2014 at 2:44pm |
1979 fish Natique 454 marine with Rodchester
.all was good until I rebuilt the engine went with a new edelbrock carb Problem is as soon as the 4 barrel kicks in it back fires through carb and it Boggs Down and won't go any faster . Run perfect when in 2 barrel . Only thing I have noticed is that I didn't reinstall the wedge plate . Any suggestions? Thanks |
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oldcuda ![]() Senior Member ![]() Joined: June-22-2010 Status: Offline Points: 474 |
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You probably need to put Rochester back on.I run two of them without wedge and no problem.Just built big block and rebuilt Quadrajet because I think they run better than others especially Edelbrock.Did you change intake to square bore?
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Tko87 ![]() Groupie ![]() Joined: June-19-2012 Location: Louisiana Status: Offline Points: 59 |
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Same intake small holes frt and big in rear. I put adapter plate to match intake on bottom and carb on top
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oldcuda ![]() Senior Member ![]() Joined: June-22-2010 Status: Offline Points: 474 |
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The spreadbore adaptors are hard to get a good seal to manifold not recommended.If it was me I would put Quadrajet back on see if problem goes away.Timing and advance set and working properly?Ignition upgrades?
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Tko87 ![]() Groupie ![]() Joined: June-19-2012 Location: Louisiana Status: Offline Points: 59 |
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timing good advance working
The intake had grooves in connecting the back to holes to eacother ( secondaries) |
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Tko87 ![]() Groupie ![]() Joined: June-19-2012 Location: Louisiana Status: Offline Points: 59 |
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Well scratch the carb
Updated info Pretty sure now it's the velvet drive tranny When it hiccups usually heavy accel It's lasts for a second and RPM's shoot up Usually happens in 4 barral at about 2400 RPms Shoots up to about 3600 RPms when hiccup happens I think tranny is slipping Any suggestions and what is the correct fluid |
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ny_nautique ![]() Platinum Member ![]() Joined: June-01-2011 Location: Albany NY Status: Offline Points: 1215 |
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Tico let's see some pictures of that Fish Nautique. They are really cool boats.
The fluid is Dexron III and there is no drain. To change the fluid you have to get a hand pump and suck it out. It's pretty easy though. I'm sure others will chime in, but if it really is the transmission, it sounds like a rebuild might be in your future. |
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- Jeff
1999 Ski Nautique |
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Tko87 ![]() Groupie ![]() Joined: June-19-2012 Location: Louisiana Status: Offline Points: 59 |
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I would love to share pics but how do upload them
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Tko87 ![]() Groupie ![]() Joined: June-19-2012 Location: Louisiana Status: Offline Points: 59 |
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NVMND
Just saw the link LoL |
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Tko87 ![]() Groupie ![]() Joined: June-19-2012 Location: Louisiana Status: Offline Points: 59 |
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As I'm struggling with picture uploads can u tell me what drive tranny I should have
Presently using 1.5 to 1.0 |
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Tko87 ![]() Groupie ![]() Joined: June-19-2012 Location: Louisiana Status: Offline Points: 59 |
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Ok more new info and sorry for the lack of
. I didn't mention that I recently put a 4 blade prop to gain more speed. The prop shop said that trans is likely not slipping instead at certain RPM's The prop is catching an air pocket " ventilation" And they are telling me to put my 3 blade prop back on . Opinions |
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ny_nautique ![]() Platinum Member ![]() Joined: June-01-2011 Location: Albany NY Status: Offline Points: 1215 |
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Well that would be the easiest fix to see if it is indeed your prop. Put the old one back on and see if the symptoms go away.
If they do, others on this forum may have better prop selections for you. For posting pictures, are you posting on a computer, phone, or tablet? |
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- Jeff
1999 Ski Nautique |
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Tko87 ![]() Groupie ![]() Joined: June-19-2012 Location: Louisiana Status: Offline Points: 59 |
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Trying to load from my iPhone
Says file to big Can't get photo bucket to do it either |
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Tko87 ![]() Groupie ![]() Joined: June-19-2012 Location: Louisiana Status: Offline Points: 59 |
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Finally !!
14x11 did the trick I can cruise at 28 mph at 3k rpms I can max out at 43 mph at 4500 rpms Maybe more? Didn't wanna push it Satisfied |
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