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· AKA Blownjet 468
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1,193 Posts
Discussion Starter · #1 ·
my coolant temps are practically non-existant, thinking when the blower/
intercooler was installed, the thermostat was removed. new to mercruisers, is it a special Merc/marine part, or is it a typ. chevy stat?
also, when I replaced sea water pump imp. I found a restrictor in the hose. was told to leave it out, so I did. Now, seems like excessive water
flow from the intercooler discharge port, shoots about a 2 foot stream
at idle, (water is supplied from sea pump) is this correct? could I install
a jet pump pressure regulator ahead of the intercooler? think my water press. gauge was reading about 10 to 15 lbs, taken at the crossover.
just not sure, my blown jet ran at 180 to 190, with no stat at all, but this
thing barely moves the needle on the temp gauge! (yes, the gauge works)
HELP! Jetboat guy thrown into an outdrive! (but lovin' every minute so far!)
 

· Premium Member
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1,919 Posts
When I had my Whippled 502 the intercooler water was not supplied by the water pump, it in fact grabbed water before the pump and before the sea strainer. I am not sure if it really matters but I was told that the water for the intercooler should not be feed by the pump. As far as temps go, my motor as it was set up ran a shade over 100 degrees which is fine. What you want to make sure is that your oil is getting warm. Anything between 220 and 240 on your oil and you’re dialed. As long as the oil is hot enough to burn off any condensation that gets in it it really doesn't matter how cold you motor runs. As far as the water pressure goes, it should be at 15 to 18 lbs at full running pressure (under way). Any excess can be remover with a pressure control valve.

I know everyone has a different way of doing this so get a few opinions and go with what you are confident in, that would be my suggestion.
 

· PASO ROBLES CA
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642 Posts
cool temps is definetly what u want. My cougar runs a whipple 502 with max temp around 115. When i installed the whipple i kept the main water supply running from the out drive holes, in my case the outdrive has a nose cone with 2 added water inlet holes,to the sea pump and so on. For the intercooler i installed a separate water pick up that runs to fuel pump cooler and then to the intercooler and then exits. no overheating or loading up when cruisin.I run straight 50 wt valvoline racing oil with good results
 

· AKA Blownjet 468
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1,193 Posts
Discussion Starter · #4 ·
well, went to San Antonio this weekend, and along with wacking my prop
on an unmarked hazard right at the launch ramp at the end of the dock,
I've now got the milkshake in the pan!! pulled all the plugs, cranked it over, and shot a sh tload of water out of #7. funny thing is, after cranking it over a while, to make sure I got it all out, sat for a few min.
and it started dribbling out #7 again! cranked it over, and it shot out
more water! (after I had already cracked all my hoses, to get the water
out of engine) I'm really hoping that it's an intake gasket leak, and not a
head gasket! I'm thinking that the water in the intake man. is leaking
directly into #7 intake port from the end water pass. Gonna tear off the
blower and intake man. today, after work, btw, if I shouldn't run the
intercooler water from the sea water pump, where else can I pick up
from? It's a 25' Ult. Warlock sxt cat.
 

· AKA Blownjet 468
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1,193 Posts
Discussion Starter · #5 ·
Also noticed that the only water outlet (besides the intercooler water dump)from the hull is 2 small hoses from the rear coolant passages in the
intake manifold, tapped 1/8" pipe, with hose a little bigger than vacuum
hose running to a tee into a through hull dump. does all the water dump
out the imco exaust? or should I enlarge these fittings, and let more water
dump from this area, say -8 or so? does this sound like it was plummed
properly, or did I end up with someone elses problems?
 

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295 Posts
Also noticed that the only water outlet (besides the intercooler water dump)from the hull is 2 small hoses from the rear coolant passages in the
intake manifold, tapped 1/8" pipe, with hose a little bigger than vacuum
hose running to a tee into a through hull dump. does all the water dump
out the imco exaust? or should I enlarge these fittings, and let more water
dump from this area, say -8 or so? does this sound like it was plummed
properly, or did I end up with someone elses problems?
The small hoses on the intake are to keep steam pockets from forming.
No need to enlarge. Your exhaust is where the main water flow exits.
Most prefer to run intercooler off transom mounted pickup, helps to keep fuel from puddling in intake when idling. Some racers like to feed off sea pump, so intercooler is already cooling off the line.
Whipple's are usually set up with a restrictor in place of t-stat, which is fine in warmer states.
Up here in OR., water temps are low so most shops run a t-stat setup.
I am going back to a t-stat setup on my Whippled 500.
 

· AKA Blownjet 468
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1,193 Posts
Discussion Starter · #7 ·
Went ahead and pulled the blower,manifold, and drivers side head last night. sure enough, blown gasket! can't believe that someone would go
to the expense of taking a new crate 502, pull it down, put a nice set of
JE pistons in it, hone it for more clearance, and rebalance it, then put it
back together with a crappy set of "graphite" head gaskets!!! now I gotta
deal with this milkshake mess, just for head gaskets! didn't want to have to dig into this thing till I was ready to upgrade a few things, but I need
it running for this weekend! I wanted to run Cometic's , but don't have
the cash for them right now! aren't the MLS' gaskets reusable? haven't
ordered gaskets yet, gotta clean out this mess!
 

· Registered
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295 Posts
Went ahead and pulled the blower,manifold, and drivers side head last night. sure enough, blown gasket! can't believe that someone would go
to the expense of taking a new crate 502, pull it down, put a nice set of
JE pistons in it, hone it for more clearance, and rebalance it, then put it
back together with a crappy set of "graphite" head gaskets!!! now I gotta
deal with this milkshake mess, just for head gaskets! didn't want to have to dig into this thing till I was ready to upgrade a few things, but I need
it running for this weekend! I wanted to run Cometic's , but don't have
the cash for them right now! aren't the MLS' gaskets reusable? haven't
ordered gaskets yet, gotta clean out this mess!
That sucks.
I'm running the Fel-pro high perf. marine gaskets at 9 lbs. boost. 3 years no issues. Readily available, and a tad cheaper on a daily driver tune up;)
 

· AKA Blownjet 468
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1,193 Posts
Discussion Starter · #10 ·
I ran 1017-1 -Pro's on my blown jetboat, @ 15/16lbs. and they lasted almost 8 years! by then it was time to freshen it up anyway, 100long
Fererea 11/32 valves, K-Motion springs etc.. went to a 1017-2 then, for
that extra .010 thou clearance. I ordered some 1047 fel-pro's this morn.
couldn't afford the cometics this time! will wait for when I upgrade some
stuff, ie: cam,pan, pump, adjustable rockers, etc. pressure tested the
intercooler, held 20lbs. for 8hrs. so it's fine. just wondering how the f__k
i'm gonna get all the milkshake out! looks like a mint julip,(kendall).
guess I'll keep dumping some 5/20 in it, and letting it run out the drain.
(it's free from work) think I should hook up my prelube tank, and flush out
the passages? what a mess!!!!
 

· Registered
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1,486 Posts
I ran 1017-1 -Pro's on my blown jetboat, @ 15/16lbs. and they lasted almost 8 years! by then it was time to freshen it up anyway, 100long
Fererea 11/32 valves, K-Motion springs etc.. went to a 1017-2 then, for
that extra .010 thou clearance. I ordered some 1047 fel-pro's this morn.
couldn't afford the cometics this time! will wait for when I upgrade some
stuff, ie: cam,pan, pump, adjustable rockers, etc. pressure tested the
intercooler, held 20lbs. for 8hrs. so it's fine. just wondering how the f__k
i'm gonna get all the milkshake out! looks like a mint julip,(kendall).
guess I'll keep dumping some 5/20 in it, and letting it run out the drain.
(it's free from work) think I should hook up my prelube tank, and flush out
the passages? what a mess!!!!

Sorry to hear about the mess. What ya need to do is fill the block with deisel fuel. It's called pickeling. Let is sit a few hours and drain. Then fill with cheap oil and new filter and run a short time. Enough to get warm. Drain and do again. Usually takes a couple times. Then Fill with good oil and filter and make sure to get temps of oil good and hot after she is back on the water. This will burn off any remaining moisture that is left. It's a big PITA, but wouth it.


Darrell.
 

· AKA Blownjet 468
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1,193 Posts
Discussion Starter · #13 ·
I didn't purchase the motor, it came in the boat. started wondering when
i was blowing the heads off with brakleen, and the black paint washed off
and it was chevy orange underneath! turns out, seems more like he got a
deal on the motor, fluffed it up with some new pistons, and put it in the
boat. AT LEAST I know what's in it now, got it all back together,
( it's got Fel-Pro 1047's for head gaskets now) and me and a friend are
headed up to Naci (OAK SHORES) IN ABOUT 15 minutes!! we'll se how it
goe's!!
 

· AKA Blownjet 468
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1,193 Posts
Discussion Starter · #14 ·
where&what kind of pickup for cooler?

Well, drove all the way to Naci, and ended up having to come back without even getting the boat in the water.(family issues) So now, I'm
figuring on installing a seperate water pickup for the cooler. Where's the best place for it? in front of the step on one of the sponsons? can't see
anything on the transom that would work very well, being that it might not have contact w/ water at all times. also, what kind of pickup?
could I use a -8 or -10 bulkhead fitting with a 45* slash cut(like a V-drive,
or should it be more like a clamshell/grate type? (have one) what works
best? if I have to put it at the bottom of one of the sponsons, I'll have to
cut acess holes in the floor to reach it! could I run somthing from the
transom, and run a hose to a bulkhead thru the hull? don't want it to
look hokey, just need some feedback from you guys that have done this
already!
 
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