Thank you for the good information. I was not aware that CMD sold out. I have been dealing with MTS ( www.500cid.com (http://www.500cid.com) ) I'm not too much interested in advise coming from the people who think that a Cadillac 500 is heavier than a 454 Chevy, but for those of you who are "in the know" The advise is wonderful. It seems the public is still in the dark 25 about the true nature of these engines even after 25 years. The idea of a duel jet drive is how I think I can take advantage of the low rpm torque if the gearing is right. I do not have to use the Talor boat, if a slightly bigger boat would be safer at 90+ mph then I am open to it. Is Spectra a better choise for this aplication? Do I need to be looking at a 19-21 foot boat? As I said, The Cobra was fun at 80 mph, but the 300 Merc in the back tended to shove the nose in the air, and we did get air born going over some pretty small waves. We could not keep up that speed for long runs-we just had to take advantage of smooth water. It was interesting to reach up to catch the gear that was rising of the deck before we would hit the water again. I don't want to ride like that again-it sure beat the roller coaster at the fair, but I enjoyed the speed, and would really like to see it in a safe boat. I know that there are several BBC jet boats out there that will run at 100 plus, and the drivers (pilots) live to talk about it. I know it should be possible with the lighter and more powerful Cadillac engine. It is the low rpms that I don't know how to get past. If 300 HP can take a bass boat to the point of lift off, then 611 pounds of torque should motivate a slightly bigger boat to the speeds I have discribed. I do not have a death with-strange as that may sound-but I do have auto racing experience, and a desire to meet my friend on the water in a boat that will out run his. Now, any help with duel jet drives, or over drive gearing of a single jet pump? How about boats? What is the best for that application?
P.S. I promote supermodel Yvette Rachelle as a hobby also. www.geocities.com/perfectyvette (http://www.geocities.com/perfectyvette) (she does not do nude or porn photos)
Hey oldrigger, Thanks for the update on CMD. When my brother built the truck motor we had talked about it for a boat motor but at the time couldn't find a realistic source for manifolds. You're puttin one in a Spectra? Thats what we were thinking. Should be a great combo.
PS I have a freind with a Spectra 19 Ford jet place diverter for sale. says he wants like 4500 with new interior.
I don't care what kind of torque you are making, you will never push a jetboat over 75 with 450 hp. I had a 100+ mph 19' Daytona tunnel hull, running well over 900 hp. I know of another tunnel with 980 hp running just over 100. I had a 510 hp BBC in a 19' bubbledeck run 73, and currently have a 650+ hp Merlin running 72 in a 21' Daycruiser (albeit well set up...)
The "airing out" effect was what put that boat in the 80's. You need to start with a good tunnel hull for any kind of speed. With that kind of torque, you can run an "A2" or even "A3" impeller and keep it loaded. No need to go with a dual pump setup.
If you have a dream of 80 mph with that motor, you better start with a very light tunnel hull, with one seat and small gas tank. If you stay more realistic, you will run 70+ all day in a four seater runabout.
Don't get me wrong, I think the Caddy motor is a great stocker, which if dropped in un modified to any degree will be lighter, with more power than a stock BBC and will perform better in a boat. That being said, stock with a couple mods (intake, cam and exhaust) is about as powerful as you are going to make it on any kind of budget. A BBC has infinite possibilities for improvement, and while overshadowed by the Caddy weight-wise when stock, a set of alluminum heads makes that difference up. Then there is the manifolds, then the rotating assembly etc... The point is, you can get a 400+ hp Caddy motor for $200 or so at a junkyard. You can't buy a BBC oil cooler for that. Bang for the buck, stock, goes to Caddy.
Hey froggiestyle, I'm not down own on Chevy. Parts are not the issue here. I can take BBC boat hearers and put Caddy flanges on them. Every thing I need to get the Caddy power I want is online. There is even 713 HP Caddy engine combo available that pushes 678 pounds of torque. It has 12:1 pistons however. Thanks for the impeller information. My dream has been to have a Cad powered jet boat for some time, but my only experience has been with outboards. If it won't go 80+ then so be it. As long as it can accelrate fast and hold a steady 78-80 mph I can still win the race that pride race because my friend's Cobra can't hold 80 mph for very long at time. And, now that I have been 80mph on the water, slower speeds do not sound exciting. I don't want to get disapointed if my BB Caddy gets out run by that outboard, and I would not like it if I prefered the wild ride of his boat over that of my own. I would rather put twin 500s in it and have a set up like the twin 454 powered Talor jet boat called Quick Silver. It does 0-80 in three seconds with it's duel jet drives and dual 454s. I hear the new owner is now adding superchargers to it. I can e-mail you a picture of it on launch if you want. It stands up like a rocket on take off. Or you can find the Taylor web site online that has the photos and info. If I built a dual Cad powered boat and just put mild upgrades in the stock performance numbers, that would be 1000 hp, or 1200 pounds of torque with two engines. I just don't want to spend that kind of money. Funny thing is, a two Caddy set up would get aproximatly the same MPGs as a single chevy set up that turned out the same power numbers. Don't take my word for it anyone, I know you won't believe it-just do the research and run the numbers. This is not a Chevy vs. Cadillac argument. Its a Cad project. Now, would a Spectre be a better boat than the Talor for this application? What about Honcho? Is there an open bow boat that would work? Or who makes a 4 seater closed bow that is the right size. What are we talking about 19', 21' what? As I said, I'm an outboard guy who wants to go inboard, but I want fast and safe to be part of the same reality. Speaking of safe, I do want to mention that the 80+ runs is not a four seater family application, just a one or two person racing application for the four seater boat. I have no desire to go that fast with my wife and kids on board.
Everything froggy said is true, you will need a realitivly light TUNNEL to get those numbers. But remember in a drag race an 75 mph jet boat will spank 9 out of 10 85mph out boards!
Sounds like a perfect motor to me for a CP Gullwing. I think the TX19 is very similar. (Not sure about that one) Seats four, has a tunnel hull, well proven design and would look really cool with a Caddy motor in it. Trans-dapt makes valve covers for it too. I had a pair.
Old Rigger, did I ever write you with the name I had for a Caddy powered lake boat?
Sleekcraft and I know of one guy in town running a 500 Caddy in a street rod..he knows them in and out..he can even tell you which heads and pistons off different year models to come out to like 13:1 comp.w/stock parts..standing well behind his car..we've watched him wing it past 6000rpm..luck?..who knows ..but it is different and a torque monster..e-mail if interested and I'll give you his phone # http://free.***boat.net/ubb/cool.gif
Thank you all for the good info. Can you give me any links to sites that offer boats like need for this application. I can't fing a Roger's site. I've the Caddy engine tech I need now, thank you. Its the boat that is stumping me now. The A or AA drive pump is good info. Where do I find out more, my knowlege is not from that area. What would be a good web site? By the way, I spoke to Yvette a little while ago, and she says, "hi." Don't believe me? visit the fan site, then link to her fan club, or link to her site and e-mail her. She will reply in person.
[QUOTE]Originally posted by Yvettefan25:
[I would rather put twin 500s in it and have a set up like the twin 454 powered Talor jet boat called Quick Silver. It does 0-80 in three seconds with it's duel jet drives and dual 454s. I hear the new owner is now adding superchargers to it. I can e-mail you a picture of it on launch if you want. It stands up like a rocket on take off. Or you can find the Taylor web site online that has the photos and info.
Yvette fan 25, I would like to look up that web site, what is the address?
Mark
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