SoCal Jet Boats
Tech Talk => Jet Pumps => Topic started by: jamesgang on March 18, 2012, 04:58:37 PM
-
I am an experienced engine builder, but I just inherited a 1978 Nordic jet boat. Very cool, but nobody on the East coast knows anything about them. The boat was set up for a big-block Chevy, and I have installed a stout small block in it's place. I bought the proper hub to connect to the Berkeley 12JG drive and installed a pressure relief valve. The thermostat housing is of course different than drag race engines. There is a small plastic or rubber impeller with a spring. Do I need this-where can I buy one, and does the spring go on top or below the impeller? Thanks much.
-
I am an experienced engine builder, but I just inherited a 1978 Nordic jet boat. Very cool, but nobody on the East coast knows anything about them. The boat was set up for a big-block Chevy, and I have installed a stout small block in it's place. I bought the proper hub to connect to the Berkeley 12JG drive and installed a pressure relief valve. The thermostat housing is of course different than drag race engines. There is a small plastic or rubber impeller with a spring. Do I need this-where can I buy one, and does the spring go on top or below the impeller? Thanks much.
If you are talking about the plunger in the thermostat housing, yes it needs to be installed, this is a check valve that keeps the stat pushed into place and allows exhaust cooling when the stat is closed.
These are a little odd to plumb, looking at it from a novice standpoint it makes no sense whatsoever.
IMHO I would take it off completely and get a simple stat housing with two 1/2" outlets...
Got any pics of your project?
More than one way to skin a cat, but why would you skin a cat? :sly:
-
Your blanket statement the nobody knows about Jets on the east coast is incorrect. There are plenty of people that know about them you just have to find them. ;D.
What type of exhaust are you running. Are you running headers. If you are then the cooling set up will be a little different. I did not run what you are describing or anything in the T-stat housing as you can see I made my own anyway.
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Fblown_nordic14.JPG&hash=eaf1e593ac8f8e579166cd4caeeb7de607a4759c)
-
Your blanket statement the nobody knows about Jets on the east coast is incorrect. There are plenty of people that know about them you just have to find them. ;D.
What type of exhaust are you running. Are you running headers. If you are then the cooling set up will be a little different. I did not run what you are describing or anything in the T-stat housing as you can see I made my own anyway.
TJ...................We're not worthy.... :thumbup:
Obviously you don't know about jets, you had to put a blower on yours just to make it move.... ::)
GT
-
You're correct that my blanket statement should not have said "East Coast". It should have read that Maryland has a huge boating population, and the only response I get from anyone is "I ain't seen one of them in years", including several pros who build the big Scarabs, Fountains, etc. I'm sure there are plenty of people in the East with plenty of experience. By the way, I'm running open, over the transom headers. The piece I'm describing looks similar to the small impeller in the lower unit of an outboard motor I used to have, and I'm guessing the spring holds it down. I appreciate the help.
-
TJ: Your'e thermostat housing looks awesome- are the headers water cooled? Nice blower setup too!
-
Yes. Water cooled. Take the link in my signature and you can see what I did.
-
I'm a 61 year old drag racer and have run headers (through mufflers of course) on my cars for many years. Other than noise issues, is there a good reason to water cool the headers on my Nordic? Please don't act as though I'm an idiot, I just don't know anything about jet boats. I am anxious to get it running soon and have a little fun before I tackle paint/upholstery issues. The hull looks just like TJ's except that where his is yellow-mine is black. Underneath the paint, I can see where it once said "Spinning Wheels Racing" and has a number. Ring any bells for anyone? I will post pictures soon-and any ideas are appreciated. Thanks.
-
no question is ever a bad or dumb one. i do believe it is just so you dont burn yourself or anyone else . and hell start to melt the transum .
-
Also against the law to run headers dry in many states.
-
Running water through the headers helps cut down on the noise level a little (very little ;) )