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I'm starting to like Jet drives

Update CVX20 Project

Ok I have an engine now. It's in the machine shop getting a total rebuild. It's a gen 4 BBC. Going to 40 over forged 12 mm dome pistons a 615 lift Clay Smith custom ground jet boat cam and all the other good stuff. Steel crank ARP rod and main bolts oversized SS valves bronze guides. the works. I asked for the best parts for use in a marine jet setup. They say I will have a rock solid bottom end with 500 hp and it will be pump gas friendly at 9 & 1/2 to 1 compression. I have the Torker II intake 850 carb M/T valve covers Glenwood ribbed timing cover Glenwood logs and risers Harden 10"x4" SS tips. The Berk 12JF pump is now nearly finished but I had to relpace the bowl shaft and impeller alnog with all the seals bushings and bearings. I have a set of Glenwood motor plates and mounting feet flex plate PTO plate drive shaft coupler SS pump loader and hot foot. My Enticer is gone, I miss it and don't have much to show for selling it:mad: I still need 1000 other things but I just need to take my time and see how it goes. Thank goodness for all the people who came up with used parts for sale Thank You!! The boat is outside so the wood and glass work is on hold until the weather gets warmer. Well that's about all for now so I will catch ya-later. Thanks for looking gang!

Fred
 
Personal opinion: I'm not real big on a Torker intake...those big single plane intakes suck at low end. A Performer RPM is a dual plane and has a broader power band.

Edelbrock shows the Torker powerband as 2500-6500 and the Performer RPM as 1500-6500. The Torker doesn't even have any more on the top.

Big Blocks, Oldsmobiles and Pontiacs are low rpm, torquey motors. Unless you spend huge $$, they make better low end power (under 5000rpm) than they do high RPM (like 5000-7000). That's why I don't like to do anything that takes away from the low end because then you end up with a motor that does neither well.

That's just my opinion from an automotive background. Maybe some of the characteristics of a jet motor change things, but I can't think of a good reason why. I would want a strong motor at 1500 to 2500 for holeshot.
 
Better RPM range on the intake

Hi Ben,
Thanks for the input on the intake. I'm so cash poor on this project that I'm getting my hands on what I can when I can. I may need to rethink the intake but the price was so good it was hard to pass up. Used used used everything is used. The motor mounts manafolds and risers, intake carb and valve covers, timing chain cover oil pan and 1/2 the pump parts. Man this stuff is expensive:eyecrazy: should have kept the checkmate.
Thanks Fred!
 
Jet boats are very different from car or stern drive engine requirements.
when you nail the throttle on a jet it will instantly flash to the max rpm possible for your throttle setting-from any speed to wot is just a flash away.
Simmilar to having a 5000 stall converter on a 5200rpm car engine and starting off in high gear
low end means even less than with a stern drive, because of the stall characteristics of the jet drive.
so the Torker would be a better intake for the jet, because of the increased flow from midrange to top. you will never be below 2500 except to idle.
We built a 455 olds with 10 to 1 comp, torker intake, 6500 rpm(for a car) cam from mondello olds( the olds gods) and a 950 double pump holley
it was in a glastron cvs21 that would turn about 5200 rpm with an a-trim(I think) impeller
blew up 5 engines, three due to bad manifolds that would only leak when the were at operating temp, 1 due to incorect hose routing, and the last one the water intake valve got shut off without my knowledge.
very expensive lessons back in the late 80's
 
Good - and that makes some sense. If you need to dump lots of gas quick, the Torker probably is better.

I'm from an area where rednecks would take a car with a stock motor and plop a really high lift cam and an open plenum intake on and think they had a drag car...with their 2.92 rear axle.....

That's why Torkers, etc are sort of a pet peave....

And I'm a redneck too, just a different type.....
 
I love the SOUTH

BullittBen said:
Good - and that makes some sense. If you need to dump lots of gas quick, the Torker probably is better.

I'm from an area where rednecks would take a car with a stock motor and plop a really high lift cam and an open plenum intake on and think they had a drag car...with their 2.92 rear axle.....

That's why Torkers, etc are sort of a pet peave....

And I'm a redneck too, just a different type.....
Click to expand...
I like Jeff Foxworthy, but he sometimes hits too close to home!!!:lol:

Same here on the joker cars. mostly here, rednecks put an edelbrock carb and a chrome air cleaner on their chevy trucks and a set of boom tubes out the back and all of a sudden it is a race car:rof:
 
Jet Boat from h@##

Bought that boat at a car auction one night(Dad and I went 1 to 2 nights a week for the used car lot at the time) got home, and wispered in my wife's ear "honey, I bought YOU a boat"
funny thing, the title ended up in her name:rof:
starter was bad, engine wound up being a 425 olds and only had 4 of 6 bolts in the coupler. secondarys were froze shut on the car quadrajet
unstuck the carb at 4000 rpm with my dad driving (he was 6'3" and 290#-55yrs old) engine instantly went to 5000 rpm and nearly broke the drivers seat:lol:
that engine lasted maybe 3 more hours.
5 more engines, rebuilt jet twice, 12000 dollars later the last engine started knocking while we were out skiing. by the time we got back to the dock, it would only turn 1100rpm wide open. immediately put it up for sale:brickwall:
 
Bad luck jet boat

Dave
Hope that I have better luck with this one. My machine shop man has told me that he has a full understanding of a jet boat's engine and it's needs. He has built many many strong marine engines and has had no problems. I sure don't want to have a bunch of problems like you had.
Thanks Fred
 
The jet does take off like it has a huge converter. I am running a stroked 455. If you stomp the pedal to the floor while trying to get up on skies it will rip your arms off. Half throttle is all you can do. A jet drive gets its speed from rpms. The more rpms you can turn the more speed you get. All my pump work was done by Tom Morrow of MI. The 455 was faded out because you could not get the RPMs out of it like a big Block Chevy. I stuck with the 455 because its factory in my boat and all my rigging is for a 455. My boat will run 74 mph at 5700 rpms and get their in a snap.
 

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Bad Engines

wickedrister said:
Dave
Hope that I have better luck with this one. My machine shop man has told me that he has a full understanding of a jet boat's engine and it's needs. He has built many many strong marine engines and has had no problems. I sure don't want to have a bunch of problems like you had.
Thanks Fred
Click to expand...

Most of my problem was the stock manifolds on the first three engines,they would hold pressure until they got hot, very hard to test. 4th engine was bad judgement in letting one of my employees hook all the water hoses back up(he did them wrong even with a diagram to work from) He did not last very long. wife now gets mad if I even look at a jet
 
Got Me All Shook Up

Ok Dave you got me thinking about engine failure so I called the machine shop and told them to replace the factory truck rods with a set of Eagle SRP I-beam or Skat pro comp I-beam rods. Now the only thing that is not new is the block:eyecrazy: Better to be safe than toss a rod and sink:D
 
Hi Adam

Adam L. said:
Make sure you get us some pics of that engine when you get it back!
Click to expand...

I really need to jump on the site and see what's up now and then. I wonder if the man who has my Enticer ever logged on and shot the bull with yall yet? Hope he has fun with my old boat this summer. He said he has never ran over 45 mph in a boat before:lol: Thanks for asking about the new project.

See Ya, Wicked
 
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