pal just got a 1969 stevens jet. original 427 bbc. berk b pump with an unusual steering arm and intake placement. the front half of the B bowl is inside the transom and just the second half extends out to the water.
the boat is in very nice shape. it was someones love and they passed away unexpected so the "deal of a lifetime" came along to my friend. this boat looks like it was supposed to be set up for a V drive but a jet was used instead. it has a small scoop under the boat to take in water next to the intake piece. it also has a fin in front of the jet about 4 foot. the fin is bent so we were looking at replacements and two big names in boats in our area (phx)said very contradicting things about it.
one man said that the fin is splitting the water in front of the jet and it will not load properly with it on there, as its directing most of the water around the intake and it will increase at faster speeds. the intake has fins on both sides of the cast so that will stabilize the boat from wash out, within reason.
second man said there is no way that boat should be ran without having it correctly replaced, as it will spin out of control and at minimum cause injury.
i called one guy and he talked with the other guy. we need at least a third opinion to settle the score but the more we hear from the more confident we can be in the correct decision for safety and control on this very flat bottom hull
I was looking over some jet boat designs earlier this week and I remember seeing some note stating that there should not be anything obstructing the water within four feet of the front of the intake. I may be wrong there, but it makes sense to me.
It's lasted for 43 years the way it is. There was a thread either here or on hot boat where a guy had a Stevens with a pump like you describe. I think there was pics of it at one of the Tom Papp runs. He stripped the paint off and preserved the gel under it.
Ok it was slowride.
I tried to find the website mentioning clearance at the front of the jet, but just ended up finding several different sites claiming anywhere from three feet to two meters of clearance in front of the jet intake. The fin sounds like a bad idea in any case just reading through the random sites...
V-drive type Keel fins are not uncommon on older jets as well those with potential handling problems and I suspect the "wierd" steering" you refer to might be similar to this Weiman? this type jet install was also common on some very early Jets as well
Tom once again you hit the nail on the head with my very poor description. that looks very similar to how his set up is. i didnt take pictures of the inside, but yours look very close.
seems we have a difference of information here as well. some say nothing in front of the jet, and then photos of josh's boat with keel fin. i would assume that as stated since it has worked all this time i would leave it on, except i think it is bent to far to be saved. thus we were wondering since removal is evident for a new one, or repair of the current one. we have not been to the water yet in this boat.
Youll note the extra log(deep) FWD/RV Nozzle on the one you featured , we had a similar boat (Early Hallett) in the shop a couple years back , after some expiriments with combinations we came up with the setup below, this boat gained an enormous amount of MPH and drastically changed the handling for the better Tom
Sandeggo was giving you exactly what you asked for. Those are two different set-ups. Similar but different. The Weiman used an insert in the mold on the transom, the Stevens, like Slowrides very cool old boat, is set up like yours. This style, using a v-drive flatbottom hull to mount a jet in, took advantage of the near square transom angle to mount the bowl to. The Weiman like most deep v hulls of the time used a hull that was intended to be used as an out board or I/O and had a 12 degree (or close to it) transom and used the insert.
Most jets love a fin, especially flat bottom jets and unless you want to take the entire width of the river to turn that thing, you'll replace the bent one on yours. They're still available at Glenwood. Only a fin mounted too close to the intake will starve a pump in a hard turn, other wise there's no problem.