[slowboy]

I have been trying to tune my 18 cp tunnel. It seems that no matter what I do, the nose rides real low all the time. How does everybody set these up? How high should the nose be riding at speed? I am scared of having this boat hook while going fast.

Any help is appreciated.

 

[bc18]

I have been trying to tune my 18 cp tunnel. It seems that no matter what I do, the nose rides real low all the time. How does everybody set these up? How high should the nose be riding at speed? I am scared of having this boat hook while going fast.

Any help is appreciated.

Talk to jack at marine performance designs

 

[slowboy]

Come on guys, there are a bunch of you with this same hull. How low is the front of this thing supposed to ride while in the throttle? Trimming the diverter up does not seem to raise the front at all.

This is completely different than my last hull.

 

[River Dad]

With the limited experience I had in my old 18 tunnel (the one Russo is restoring) it seemed to run fairly flat. It didn't carry the nose anywhere near what a gullwing does. I think set up is extremely important on these hulls not only for performance but to keep you from getting wet. If I were you I would seek out a few board members that have these boats and get a good baseline to go from. I don't remember what we had in our deal back then but it might even be worth giving Scotten a call. Just my .02 RD

 

[HBInHeat]

Come on guys, there are a bunch of you with this same hull. How low is the front of this thing supposed to ride while in the throttle? Trimming the diverter up does not seem to raise the front at all.

This is completely different than my last hull.

Since this hull was designed for track use only and isnt river friendly I honestly dont.think there are but a few guys on here that run them.. Id also contact jack at mpd he works on two on a regular basis. I know his pod extensions would be a must if I had one to better ur chances if the nose takes a digger.

 

[BUSBY]

Here's how it should ride at speed:

 

[slowboy]

That is exactly what I am looking for. I wish I had a current picture of my boat running. From what I am told by my friends, my boat is running much wetter than that. I think mainly in the center section. How high can you go with the ride plate before having a chance of blowing this over?

Thanks for all the help, Ryan

 

[BUSBY]

It all depends on your boat set up. These two pictured are race boats. You have to consider wieght and your center of gravity. It takes a lot of time to get your set up just right.

Start off by measuring your ride plate angle in comparison to your hull right at the shoe. Adjust .060 up and see how it rides, then play with your diverter. Make adjustments accordingly. You'll find your sweet spot. Measure MPH via gps. there are apps you acn download onto your phone if you don't have one.

Nevermind what it looks like when at speed ... care about the best performance while staying safe. Tunnels should ride flat, not nose high. Getting lift from your shoe/hull set up. Running the nose high will increase your chance of blowing over.

Good luck

 

[slowboy]

I had this 105 on gps last fall. There was a TON of speed left in this thing, actually it felt safer and more stable the faster I went. It just feels that the nose is quite low while running it at any MPH. Maybe it is an optical illusion to me as I am sitting on top of a tunnel causing my line of sight to be quite different than what I was used to before. I will get some photos and video of it running and compare it to the pictures posted above.

 

[slowboy]

Oh... by the way, it has a small block chevy in it.:thumb:

 

[Sleeper CP]

Oh... by the way, it has a small block chevy in it.:thumb:

ok now.................

this thread is useless without pictures.


S CP

 

[2002CP19]

ok now.................

this thread is useless without pictures.


S CP

Can you photoshop a 632" FORD in there?

Would be much more photogenic, just sayin'.:yes:

 

[slowboy]

This is the best picture I have of it right now.

Nothing special, just a small block.grn

 

[bob fry]

Take pics of your hardware and email them to me [email protected]. I owned that boat when it was here in Cali. It ran very clean and with a single carb 482 Chevy ran 9:0 's and 115 mph.

 

[Pattymelt18]

That boat ran real good for alot of people. Has had about two or three different intakes set in it from the last i saw it.

 

[slowboy]

Take pics of your hardware and email them to me [email protected]. I owned that boat when it was here in Cali. It ran very clean and with a single carb 482 Chevy ran 9:0 's and 115 mph.

I will get some pics and measurements to you in the next day or so.

 

[HBInHeat]

Any idea what your motor wieghs? .the two busby posted r na motors and urs though a small block.is.running a big heavy blower. Id think that alone will change the attitude of the boat a lot

 

[slowboy]

Im not sure what the engine weighs, but would guess it is a little heavier than an NA aluminum headed BBC. Word on the street is that this boat was set up with a blown BBC before I bought it. The guy who rigged this hull for the person I bought it from sent me a PM and said the setup is completely wrong for my combo. Hopefully I will get with him and get it figured out, or at least close. I have had many people send me PM's with help, thanks to all.

Ryan

 

[787chuck]

Any idea what your motor wieghs? .the two busby posted r na motors and urs though a small block.is.running a big heavy blower. Id think that alone will change the attitude of the boat a lot

i was thinking the same thing . has any one ran a cp tunnel with a blown small block ? you my have to move the motor around a bit to find that sweet spot

 

[BUSBY]

The weight should be about the same from a single carb'd BBC and a blown SBC.

I know that boat too ... but Bobby would now it better since he owned it not too long ago. Was your engine iron Bobby or aluminium?