Super Jet dual 38's vs dual 44's on a race superjet

[Jhucke]

My current motor setup is a 61x/61x stock 44, lightened flywheel, riva girdled head with 35cc domes and protec stainless b-body pipe. Looking to get into racing next year and was wondering which carb options would bet better for my mild motor set up, dual 38's or dual 44s? And then what manifold?

Input is appreciated, thanks

 

[TheBuzzard]

R&D and BCW used to make a dual 44 manifold and protec made a dual 38 manifold. there are also a few off brands floating around out there.

 

[XJCrawler]

I would do a case swap before I buy a dual carb intake for a 61x

 

[Jhucke]

I would do a case swap before I buy a dual carb intake for a 61x

I knew someone was going to say that.. I already have dual 44's and all it would take is a $70 manifold, I figured it couldn't hurt. I also figured it would be pretty darn easy to trade 44s for 38s. Not looking to case swap yet.

 

[High Speed Industries]

Racing with 61x cases is a waste of time.
If I were you I would upgrade to the 62t cases, it's the only way to go. They are a huge improvement over the 61x cases.
If you upgrade to the 62t cases just find yourself a 760 manifold, it will work perfect with the 44s.
Here is my setup on my 08 super jet that I race.
62t/61x cylinder/cases
milled head (pump gas)
760 carb/intake setup (760s have fiberglass reeds which is a small improvement)
msd enhancer
B pipe with limited chamber.
My ski rips for a stock 701 and it does awesome on the track. You have a pretty close setup to mine, just step up to the 62t cases.
Now as far as racing goes what class do you plan on entering? My ski is setup for limited and you are NOT allowed a lightened or aftermarket flywheel in that class. At local and regional races you can probably get away with running a lightened one. You might want to go back to a stock flywheel if you are going to enter bigger races where they inspect your motor.
Either way just get out there and have fun.

 

[Jhucke]

Racing with 61x cases is a waste of time.
If I were you I would upgrade to the 62t cases, it's the only way to go. They are a huge improvement over the 61x cases.
If you upgrade to the 62t cases just find yourself a 760 manifold, it will work perfect with the 44s.
Here is my setup on my 08 super jet that I race.
62t/61x cylinder/cases
milled head (pump gas)
760 carb/intake setup (760s have fiberglass reeds which is a small improvement)
msd enhancer
B pipe with limited chamber.
My ski rips for a stock 701 and it does awesome on the track. You have a pretty close setup to mine, just step up to the 62t cases.
Now as far as racing goes what class do you plan on entering? My ski is setup for limited and you are NOT allowed a lightened or aftermarket flywheel in that class. At local and regional races you can probably get away with running a lightened one. You might want to go back to a stock flywheel if you are going to enter bigger races where they inspect your motor.
Either way just get out there and have fun.

Thanks for the information, what I was looking for.. I guess, haha. I'll be on the market for a set of 62t cases now, I suppose.

Yes, I just bought boyesen power reeds as well for a 61x which I'm sure translates over to 62t, correct? Do the 760 manifolds work with 61x cages?

Yeah I'm starting off my racing career in a 750 vintage open, which is one of the Greatlakes watercross tour's tamest classes, so basically run what you brung. Of course there is the potential of someone coming with a full blown race ported set-up, but it doesn't matter to me, just looking to go have fun. Definitely not trying to compete with high class boats. What are your thoughts on drop nozzles? I've been trying to figure out a cheap setup for that, too.

 

[High Speed Industries]

I don't think 61x reeds will swap over. 62t and 64x (760) reeds are pretty much the same are are interchangeable.
Drop nozzle is a waste of time.
What kind of superjet are you building? Square nose? Round nose? 08+?

 

[Jhucke]

I don't think 61x reeds will swap over. 62t and 64x (760) reeds are pretty much the same are are interchangeable.
Drop nozzle is a waste of time.
What kind of superjet are you building? Square nose? Round nose? 08+?

Okay I will keep that in mind. Seems like some people are asking a ridiculous amount for some cases like $300, bare cases.. What is a good price to be looking for? Meanwhile, 61x cases are going for about $50.

Really.. I only asked because I had big plans for one, hoping to assemble it as a cats. Going to the races this summer, many of the racers that had a drop nozzle on their superjets said it was absolutely essential in big chop and some corners.

Squarenose which is already built, just looking to improve it. I knew I was going to have to upgrade cases eventually, just a matter of time. So you think it's going to be a big dramatic power increase? Cases before lightened flywheel?

 

[Big Kahuna]

With the right setup 61x cases with single carb can and will work really well, but it is all about the setup. Drop Nozzle is fine if your racing, you only use it at the start.........

 

[High Speed Industries]

$300 is a little steep for a set of cases. I sold my last set for $180 shipped. If you are tight on funds just run your 61x cases for now. It's better than nothing.
I've never used a drop nozzle and I really don't see the need for one. Just like Big Kahuna said, they are only used in the starts. If you are just getting into racing I wouldn't worry about it. Staying pinned is the key to cornering in big chop.
If you are racing a squarenose I would look into some tubbies, they will help quite a bit in the corners.
I still think cases will be your biggest improvement. According to my yamaha manual a stock 61x makes 65hp and stock 62t makes 73hp. Thats with a stock motor, if you have mods it will be an even bigger improvement. I would do cases before a flywheel, actually I don't know if I would do a flywheel at all if you are racing. A flywheel give you more snap, there is no hp gain at all. I found that I raced better with a stock flywheel as compared to a lightened flywheel. The lightened wheel is nice for freestyle, but for racing it makes you get tired quicker because your power isn't so linear. I also found that I had better control with the stock flywheel because the throttle response was more tame.
The best thing you can do for racing is practice, anyone can ride a fast ski in a straight line. Find some buoys and start doing some turns. The ski is only part of the equation.

 

[Jhucke]

$300 is a little steep for a set of cases. I sold my last set for $180 shipped. If you are tight on funds just run your 61x cases for now. It's better than nothing.
I've never used a drop nozzle and I really don't see the need for one. Just like Big Kahuna said, they are only used in the starts. If you are just getting into racing I wouldn't worry about it. Staying pinned is the key to cornering in big chop.
If you are racing a squarenose I would look into some tubbies, they will help quite a bit in the corners.
I still think cases will be your biggest improvement. According to my yamaha manual a stock 61x makes 65hp and stock 62t makes 73hp. Thats with a stock motor, if you have mods it will be an even bigger improvement. I would do cases before a flywheel, actually I don't know if I would do a flywheel at all if you are racing. A flywheel give you more snap, there is no hp gain at all. I found that I raced better with a stock flywheel as compared to a lightened flywheel. The lightened wheel is nice for freestyle, but for racing it makes you get tired quicker because your power isn't so linear. I also found that I had better control with the stock flywheel because the throttle response was more tame.
The best thing you can do for racing is practice, anyone can ride a fast ski in a straight line. Find some buoys and start doing some turns. The ski is only part of the equation.

Yeah I have tubbies and all that, installed last year. That is my favorite mod on the ski, even better than the pipe IMO.

I have some guys I ride with that have buoys set up all the time, I've been practicing and all that, no worries. Gotta hit it hard next year though.

Yes, I'm aware of all this about the lightened flywheel. It's a rec boat that I'm deciding to race for fun. So when I'm not racing, I like snappy throttle.

Might even completely do my motor this year with a rebuild and maybe some minor porting. I know my 61x will be just fine.. I mean the 62t upgrade isn't going to go from fast with a 61x to completely ripping my arms off, I know that.