help with blower motor

[koldcowboy]

Hey Newbie here:
:)
I need help with this damn Blower motor issue......
here it goes.
19 hours on a 454 stock
with aftermarket roller cam
Weiand blowers, and dual 650-cfm Holley carburetors
40-45 mph no problem runs around all day long no issues
as soon as boat accelerates to about 55-60 get a crazy pop,
pop :confused: from the motor on decceleration...(seems to happen when it gets in boost and then just backing off the throttle ever so slightly).
then,
motor stalls out dead in the water.
Fire it right back up no problem blows smoke out of the exhaust then runs around until you accelerate again to the same issue.
thats my problem....
First thoughts were fuel.
so checked fuel lines everything is ok
check carbs...ok
changed a couple bad spark plug wires...
ran it around Elsinore again the next week.
no issues until it hit boost again....damn damn
now she wont even idle....running on 6-7 cylinders maybe..
had to limp her back to the trailer!!!!!!!!
please help
give me your thoughts!!!!!!!!!!!!!!

[Hotcrusader76]

What's your fuel pressure at? Timing?
Sounds like ya leaned her out somewhere.
~Ty

[Heatseeker]

You might want to run a compression check.
I know first hand what happens to stock cast pistons running lean under boost. How are your carbs set up?

[koldcowboy]

Originally posted by Heatseeker
You might want to run a compression check.
I know first hand what happens to stock cast pistons running lean under boost. How are your carbs set up?
heatseeker,
Do I need to ask what happnes...Should i be worried?
Im so new
The motor ran good.. sounded even better....
No idea what or how the carbs are set up...
and no fuel pressure gauge so i have no idea....

[Hotcrusader76]

Originally posted by koldcowboy
...
and no fuel pressure gauge so i have no idea....
dude you need to find out what your pressure is at and also find out the timing. You could very well not be giving it enough fuel.
~Ty

[koldcowboy]

Originally posted by koldcowboy
Hey Newbie here:
:)
I need help with this damn Blower motor issue......
here it goes.
19 hours on a 454 stock
with roller cam
Weiand blowers, and dual 750-cfm Holley carburetors
40-45 mph no problem runs around all day long no issues
as soon as boat accelerates to about 55-60 get a crazy pop,
pop :confused: from the motor on decceleration...(seems to happen when it gets in boost and then just backing off the throttle ever so slightly).
then,
motor stalls out dead in the water.
Fire it right back up no problem blows smoke out of the exhaust then runs around until you accelerate again to the same issue.
thats my problem....
First thoughts were fuel.
so checked fuel lines everything is ok
check carbs...ok
changed a couple bad spark plug wires...
ran it around Elsinore again the next week.
no issues until it hit boost again....damn damn
now she wont even idle....running on 6-7 cylinders maybe..
had to limp her back to the trailer!!!!!!!!
please help
give me your thoughts!!!!!!!!!!!!!!
DUDE:
The motor is shot....DAMN DAMN DAMN.
# 2 nothing on compression
every other cylinder 150 PSI
Leak down test: Air blowing out the intake( carbs)
Water in every cylinder
Plugs are shot
No fuel pressure regulator
HYDRAULIC the motor maybe?????
Maybe bent intake valve????
The suckie thing is this is a new boat to me. i just bought this thing from a private party a month ago. I ran it for 30 minutes...had the problem...
took it to the engine builder he said they might have found the problem and installed 3 new wires. I went back out again and had the same problem again but this time it wont idle anymore.
running on 7 cylinders.
Any thoughts from you Veterans guys on this board.....
WHAT DO I DO???????

[79 Howard]

Cowboy; A lot of guys should chime in on this for you. To begin with it is mandatory that you know your timing advance. your fuel pressure,your boost,motor temp, oil pressure. There is a mutitude of needed and wanted items to assure you a fun time in your boat but you have to know what your power plant is doing

[79 Howard]

To answer your qustion of what do I do check out wild Bills machine shop

[Infomaniac]

Sounds like one of 3 things.
Burned head gasket
Burned piston(s)
Burned valve(s)
Tune up is critical on stock engine with blower. Must be very conservative.
How do the spark plugs look? I will bet a couple of them do not look good.
#2 no compression is not a good sign.

[VD CRUISER]

Maybe more than one of those three things.

[koldcowboy]

OK Motor junkies....Here it is:
I dropped off the boat this morning in Corona hint???Hint???
They tore down the motor:
Heres what i saw:
They took off both heads
Even bank, # 2 is dead intake valve "tuliped the valve"
So why did this happen i asked???
LEANED HER OUT
Checked fuel pressure from the "new" black holly fuel pump
Well turns out 3 psi was pumping out......Should be no less then 6-7 i guess with this application. So when we were running 35-40 no worries motor was fueling fine then we get into boost and higher RPM's we sucking fuel from nowhere...boat stops dead in the water regression floods the exhaust headers and wamo you have this story....
So Im happy to say that the engine is going to be rebuilt this week with new goodies that i buy this time.
You guys are one good reason the boat fourms are useful tools. I will keep you posted on news to come...
If you have any other info or ideas for a me shoot them my way.
Hope to soon be floating again and can buy you guys a beer
thanks,
kold

[Infomaniac]

Get rid of the electric pump !!
Buy a Clay Smith mechanical pump from clay smith cams.
Run a bypass regulator and never worry about that happening again.
Do a search for bypass regulator and read away