Back From the Dead - Yamaha FX-2

[brapperdoodle]

So, does anyone have a suggestion for an exhaust tube? I was thinking I could use this :

HPS 2-1/2" OD, 6061 Aluminum Straight Pipe Tubing , 16 Gauge

HPS 2.5" 63mm 6061 Aluminum Straight Pipe Tubing 16 Gauge 1 Foot Long ideal for diy custom air intake, radiator cooling systems and turbo intercooler piping

hpsperformanceproducts.com

It says they do not recommend it for exhaust use, but I am assuming that they mean for an automotive turbo type application...

Also, I would like to swap the cooling lines for SS and the last set I bought was from Pro-Tec. I have access to K+S metals at a great discount but their SS tubing is 304 and I thought I remember that not being ideal for salt water use. Can anyone give some advice on either of these?

 

[Big Kahuna]

So, does anyone have a suggestion for an exhaust tube? I was thinking I could use this :

HPS 2-1/2" OD, 6061 Aluminum Straight Pipe Tubing , 16 Gauge

HPS 2.5" 63mm 6061 Aluminum Straight Pipe Tubing 16 Gauge 1 Foot Long ideal for diy custom air intake, radiator cooling systems and turbo intercooler piping

hpsperformanceproducts.com

It says they do not recommend it for exhaust use, but I am assuming that they mean for an automotive turbo type application...

Also, I would like to swap the cooling lines for SS and the last set I bought was from Pro-Tec. I have access to K+S metals at a great discount but their SS tubing is 304 and I thought I remember that not being ideal for salt water use. Can anyone give some advice on either of these?

McMaster Carr for the stainless waterlines. Probably could get an exhaust tube from them or use an RRP Handlepole tube if its long enough!!!!!!

 

[Sanoman]

Mcmaster Carr…

 

[Storbeck]

If you're thinking salt water might want to go stainless for the exhaust too. I love mcmaster but for something love this you can probably find cheaper if you shop around.

 

[hornedogg79]

Same exact aluminum pipe I used. Looks to be the same spec used in my other hull too.

 

[brapperdoodle]

Cool, it won't be strictly salt water use but it will be in the surf hopefully a few times a year! Today I will be aligning the pump and dropping in some thickened epoxy with chopped strand around the 144 tunnel. This will be my initial setting of the pump cavity. I am expecting the epoxy to get into the tighter areas and give me enough hold. After it cures I will be doing some sanding of the excess epoxy and then finally glassing in the 144 tunnel! I can't wait until all the sanding is over haha

 

[brapperdoodle]

Having trouble getting this tunnel where I want it. I have the pump perfectly aligned with the tunnel in this position and tightened down. There is a decent gap in front of the intake grate where the tunnel is lower than the hull itself. Should I just fill it and then sand and glass it level after the tunnel is stuck in place??

 

[brapperdoodle]

Hold your breath…

 

[fastgtfairlane]

Looking good man!

 

[E350]

How does the tray foam not get soaked with water with the shaft going through the foam like that?

 

[brapperdoodle]

How does the tray foam not get soaked with water with the shaft going through the foam like that?

haha the driveshaft tube slides in from the tunnel area and will be sealed with 5200! This was just an initial alignment for the entire tunnel graft, to get the tunnel straight and glued in to the hull. Now it won't move so I can really glass it in

 

[mikesx]

What mid shaft are you using, FX or SJ?

 

[brapperdoodle]

What mid shaft are you using, FX or SJ?

I was planning on using the FX midshaft. I have a SJ midshaft also but I think that's too long... I measured the distance of the intake grate mounting holes to the bulkhead on the stock FX, and set this 144 tunnel in the same relevance to the bulkhead. (intake grate mounting holes are same distance as stock) I figured if I have to get a custom driveshaft or something it won't be the end of the world.

 

[mikesx]

Never did this conversion myself but couldn’t you mount your FX mid shaft, you know that will work dimension wise if you’re not changing motor mount location, and set your new tunnel fore and aft to work with a pre 08 pump shaft? Or does that put the pump too far back?

 

[brapperdoodle]

Never did this conversion myself but couldn’t you mount your FX mid shaft, you know that will work dimension wise if you’re not changing motor mount location, and set your new tunnel fore and aft to work with a pre 08 pump shaft? Or does that put the pump too far back?

From what I understand, when you mount the 144 tunnel in the same place as the FX tunnel, it places the pump shoe and pump mounting 2" further back. This allows you to use a stock length Superjet driveshaft with the FX-1 midshaft. If my measuring was correct, we will see if it works ha. There is some room to play with on the midshaft and coupler with depth and shims, so I hope this will not be too difficult. The pump you see in the pictures is the stock pump out of my 1995 Superjet. I was using it just to get my initial alignment for the tunnel graft, but I realized that pushing the tunnel forward or backwards would effect how much of the shaft is sticking though the bulkhead. I decided to measure from the bulkhead to the intake grate mounting hole center, which was 2-11/16" on the stock FX-1. I mounted my 144 tunnel exactly that same distance from the bulkhead. I have never done this conversion before but there is only 1 way to find out

 

[brapperdoodle]

I removed the stock pump and flipped the ski over to see what I was working with… it looks like most of the thickened epoxy squeezed through the large gaps to the bottom side of the hull. The tunnel seems lower than I would have expected, but the alignment is ideal. I decided to try another pump to see if I could get proper alignment…



The steering mount seems a bit close to the hull but I guess I will just have to clearance that.

 

[Sanoman]

Are you showing off that new pump

 

[brapperdoodle]

Are you showing off that new pump

If the shoe fits... WEAR IT!!!

 

[brapperdoodle]

I wish I had another ski to measure off of, but it seems like the midshaft is in about the correct spot to work. I won’t know until I check actual spline depth and the coupler alignment…

 

[brapperdoodle]

I was able to get all of the sanding and prep work complete for the tray/gunnel area. YAY! Today will be doing the final glassing of the tunnel graft and gunnel reinforcement. Does anyone have a suggestion on how much glass to use for the final layer? Im thinking 1 layer of 1708 biax for the gunnels, and 1 layer of 17oz cloth for the pump tunnel... I have 3 LARGE rolls of glass, 1208 biax, 1708 biax, and 17oz cloth. Let me know what you think!