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Topics - bluthndr

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Jet Pumps / Jet drive basics/mods tutorial - help ?s
« on: February 04, 2023, 05:09:08 am »
I get most of the basics here.  Impeller sizes/cuts, blueprinted drives, place diverted, etc, but I can?t find much info on other things.  I see all these different setups but little on no info on the what/why of it.   So I have all these questions about ?what is a _______?  What does it do? And when would I want one??

Droop snoots
Ride plates

And I?m sure there are several others I?m missing.  I?ve seen them but at what point do you want one?  And for what purpose?

Jet Pumps / Why do guys move the jet drive back?
« on: January 15, 2023, 06:30:36 pm »
I have noticed several guys redoing or building boats (Finnegan included) that have the jet drive (and intake/shoe) moved quite a bit rearward.  The "cleanout" being outside the boat, rather than inside like mine - which I'm sure is stock.  At one point last fall I was looking at buying a 14-71 blower motor for my boat, but after talking to some experts - or at least guys that know more than me - thewy said I'd need to move the whole jet drive back.  That's more than I want to do, but I wanted to ask why.  There don't seem to be much in the way of tech on such things - even on youtube or here.  What gives?

Engine Mechanical / Electrical / Where do I want idle rpm on trailer?
« on: July 30, 2022, 03:01:56 pm »
Looking for suggestions on where I should set idle on trailer.  1200ish?  Idles awesome on trailer about 900 rpm but, of course, in the water with the impeller lol ad won't stay running, and a moving, loaded boat is not ideal for idle tuning...

Hulls / Fastest hull for 18-20' lake boat
« on: July 21, 2022, 08:19:24 am »
What are the fastest hulls (non drag race) that you could use regularly and still be the fastest guy on the lake?  Sanger?  Rogers? Hondo? Daytona?  Others??

Jet Pumps / How to tell what impeller (Berkeley)
« on: July 12, 2022, 08:05:46 am »
Can you tell what impeller you have without pulling the pump apart?  From the tag I guess it?s an A? (See pic).  I pulled the (inspection?) cover off and it looks like it?s in good shape, but is there a letter cast or stamped into it somewhere?

Jet Pumps / Fastest Olds powered jet boat
« on: July 06, 2022, 08:36:12 pm »
What/who was the fastest Olds powered jet boat that anyone knows of here?  What was their setup?

I assume an AA impeller or steeper because lots of torque And not lots of rpm...

Just curious

Engine Mechanical / Electrical / Olds 455 thread/autopsy/tune-up
« on: July 06, 2022, 08:07:17 pm »
So I'm neck deep into my first jet boat project and can't find any recent threads on stuff, and I have a fair amount of Olds experience (built several big blocks over a 10 year period, flowed lots of heads on a flow bench, daily drove a Streep/strip 455 engine swapped car for several years, am a full time mechanic and own a shop, etc.) so I thought I'd share:

Not sure where to start.  Bought the boat a year ago from a non mevhanicalguy wjod pumped the engine full of 15 qts of water.  Local Hot Boat guy checked out the boat/pump half and gave it the thumbs up.  Always wanted one and the deal was right so I took it.  Emptied things out and a few days, a coil, some wiring, and a carb rebuild later I had it dryed out and running in my shop.

Leaking freeze plugs replaced, replumbed EVERYTHING (the reason it was full of water - no pressure relief and headers plumbed ahead of engine with no pressure relief).  New control cables (not tryna die or run aground).  Rewired everything (sketchy wiring is a pet peave), put it in the lake.

Ran pretty decent 4200 rpm, sounded ok, wouldn't idle, 45+ year old gauges... 

New gauges, new switches, new vac sec carb it didn't seem to run any better, but at least I can see some info on the gauges.  Now we're getting somewhere. 

Runs good for about 2 minutes and dies.  Let sit for a minute, repeat.

15 fuel filters later (hey it's old - who knows what was in the tanks right?) And I realize it's the tanks coming part on the inside (or at least the liner) and plugging things up.  Let it sit a minute or two, sediment falls to the bottom of the filter, yay, 2 more minutes of run time!  New aluminum fuel tanks to the rescue.

Now it occasionally gets hot... Hmmm. Runs for a few minutes at normal temp - then gets over 220 as it shuts down...  (Am I sure it's a fuel problem?  Maybe it's a hot ignition module?). I'm getting steam out the headers the whole time...

Double pumper carb with fuel pressure gauge, new recurved distributor, new (good) coil, new ignition module, ignition timing set to 12* initial, 34* @2800.  Starts and runs great,. REALLY responsive, kind of excited.  Still can't get it to idle quite right and it's missing worse.

Let's see what the vacuum gauge says about idle mixture...  Uh-oh.  Needle bounces.  That's bad...  Valve covers off - 3 stuck exhaust valves and corresponding bent push rods.  Dammit.  Not sure if it was me or the previous owners, but here we are.

How does a gear-head shop owner living his childhood jet boat dream fix bent valves?  Aluminum cylinder heads.  Modern airflow technology is great stuff... 

That's where I am now.  Lots of pictures along the way.  Feel free to ask questions. 

Side note - I know this thing won't ever be fast because Olds, but I'm trying to get it together to be the lake hero for a few weeks, while my buddy with a 548 v-drive fixes his broken rocker arm and guide plate.  Rocket power ftw.

Still having some issues with the place diverter, have a new cam but not for now, then I have a loader to try and see where I can get...

New to jet boats.  Always wanted one.  Working my way through a number of things on my (new to me) 75 Hallett.  Biggest problem turns out to be (I'm assuming) the lining of the tanks coming apart, and has now plugged 11 fuel filters...

So I go looking for and find things about fiberglass tanks, which I never would have guessed was a thing.  So they need to be replaced...?  I found Speedway tanks 8x33 or so that I could use...  What all is involved in doing this?  Tutorial anywhere? I'd rate my mechanical aptitude as high - I own an auto repair shop and we make/fab parts and tools on the regular...



Jet Pumps / Holley jetting, PV baseline
« on: June 14, 2022, 09:28:06 am »
Good amount of experience with this stuff, just not a lot with boats. Holley 750 vacuum secondary on a 455 Olds in a jet boat.  Where would you start for a jet and power valve?  I'll get the vacuum gauge out and do it right after a bit.  Just looking for a starting point.

Jet Pumps / Hydraulic Place Diverter Issues
« on: June 14, 2022, 09:18:02 am »
Is there a trick to getting it bled?  Worked fine when I replumbed it, then sprung a leak and drained itself in the driveway testing.  Got it working again after fighting the "down" function a while.  Got it fixed/bled.  Worked fine for a day.  Now no "down" again.  I can still hear it running when I use the switch, so I know it's not wiring.  Reservoir is full to about 1/2 inch from the top.  But it sounds like no load on the motor/hydraulic pump in "down".  When I pull the hydraulic line nothing is pumping through it (down only).  Anyone have a link to a Service manual, bleed procedure, wiring diagram, anything?  I see 4 solenoids and a hydraulic pump and reservoir, and I know it's at least capable of working right...

Trailers / Parts for Barron Trailers
« on: June 08, 2022, 08:05:40 am »
Where to look?  I got a Barron Trailer with my Hallett that needs some TLC.  Mainly looking for bearings and seals and related.  Needs a new winch and jack and wiring as well, but I'm just going to get some universal boat trailer stuff and weld/fit/wire it up.

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