Coffman Sizzler setup and tuning

[Quinc]

Enough people here are running a Sizzler pipe so thought we should have a thread to post how you have your piped tuned, water lines ran/reduced etc.

@CRJ
@King Kang
@Brian_216
@gto0209
@B_RAD_BALLA
@SharkB8

61x/61x
754cc bottom end porting
Pro-Flo 46mm carb
190 compression
msd enhancer
Solas repitched 13/15

Sizzler mani and headpipe bored to 47 mm and gasket matched to the exhaust ports, polished and opened up etc.
Still tuning and playing with it but this is what I have so far:

• Tapped for dual cooling
  
• Cooling line running from the headpipe to the pisser reduced to 3mm (dribbles out the pisser)
• Stinger line has a valve that I have been slowly closing off to see if there is a difference
• WOT RPMS are currently around 6500 +/- 50
• Chamber gets hot but does not sizzler or steam off water.
• Head pipe is a little warm to the touch. Should probably get one of those laser temp readers..
  
• Bottom end is snappy, but I am not sure if it is as good as it is going to get or still has room for improvement..

 

[TheBuzzard]

somebody cut / shortened that tail cone section. its supposed to have 3 bumps/rings that keep the coupler clamp on. shorter tail section means you lost bottom end and chamber volume, but supposedly gained RPM/top end. since i bought coffmans out, i have brand new nice and shinny uncut tail sections for sale.

 

[Quinc]

somebody cut / shortened that tail cone section. its supposed to have 3 bumps/rings that keep the coupler clamp on. shorter tail section means you lost bottom end and chamber volume, but supposedly gained RPM/top end. since i bought coffmans out, i have brand new nice and shinny uncut tail sections for sale.

Well sum b!tch.. Hook a brother up! =) Or would I be better off going to a bpipe or tnt/c4?

Edit. I might be able to make new rings and tig them on. How much longer does the three rings make it?

 

[TheBuzzard]

i've ridden superjets with coffman sizzler pipes that had more bottom end than some with b pipes. i think porting is more critical than the pipe you run. looks like you lost 2-3 inches, cheap skate : )=

 

[Quinc]

I just can't win with these damn jet skis..

 

[King Kang]

I have two SJ sizzlers and they're both different- the head pipes are slightly different dimensions, and I can't tell if they came from Coffmans that way or if one was modified later. One of my head pipes looks exactly like the one in @Quinc initial pic. It is silver, the lower water outlet faces forward, and it has a shorter flange that attaches to the manifold. The other one I have is identical to the one picture above. It is black, has the lower water outlet facing backwards, and has a taller flange. Here is a pic showing them side by side for comparison.

 

[King Kang]

I haven't taken the hose off yet but I think I have both a short and a long tail cone. If I do, I'll a/b test them this summer and share the results, but keep in mind that I'm running the pipe off a stock 6m6. The shorter tail cone might be better on a BB setup- isn't the Mod chamber shorter than the limited chamber for a B Pipe?

I bought a brand new Sizzler for $375 + $20 shipping earlier this year, but it didn't include some mounting parts. I needed to spend $12 on a pisser, $1 on a plug, $14 on bolts, and $15 on gaskets. All in I've spent $437.

 

[TheBuzzard]

the short one is the HP headpipe. coffman says cut 1/2" off both ends of the long ones to crank out more HP & RPMs. the fitting thats forward or back is just an outlet to be pissed over the side. this fitting reduces head pipe water pressure and helps dry out the chamber for more power. some of the headpipes dont even have that extra fitting but it can be drilled. the new one that quinc posted has the long headpipe but i've never seen a sizzler pipe with the long one. kawi usually has the long one unless somebody has cut it into the HP. i have long and HP headpipes, SJ tail cones and kawi rocket tail cones for sale.

 

[King Kang]

There appear to be a few variations on the head pipe design.

Here is a short one without the bypass outlet.

Here is one on an SJ with the long head pipe.

 

[Quinc]

 

[King Kang]

I do have a long and a short cone, so I can test them out this season and see if it makes a difference on my setup.

 

[King Kang]

Two things:

First, attached is a PDF of the Coffman Sizzler Superjet installation instructions (and also the VXR, and Waverunner III.)

Second, I think I cracked the code on the different head pipes. I believe the black, long flange head pipe was originally designed for use on the sit downs, and the short flange (HP) head pipe was designed for the Superjet. How did I reach this conclusion? Step 11 of the installation instructions stipulates that the sit downs need to use the three ~1.5" long bolts to attach the head pipe to the manifold while the Superjet must use the three ~1.25" long bolts. The longer bolts are required to reach through the longer flange on the sit down head pipe. They won't work on the Superjet head pipe because they will bottom out on the manifold before applying the pressure necessary to tighten the head pipe down. That's why the Superjet's short flange head pipe has to use the shorter bolts. Make sense?

 

[CRJ]

nice!

mine rips real hard, the pipe hits hardest mid rpm.

im running a 61x/61x 762cc, 46mm sbn, pipe is stock bore, i have opened up the manifold ports to match up to my cylinders.

I run dual cooling, the pipe and cylinders on their own system. the head pipe comes in the back and goes out the port side to a pisser, the other line goes in the manifold and comes out to a T in the head and another pisser. I run ADA thermostats in line to keep the motor at perfect 140* pisser water temp.

ive thought about a b pipe but im happy with the power and i cant justify the cost. this motor im sure would do flips in a AM hull.

i should add that mine does sizzle right after the head pipe when im done riding.

 

[Quinc]

How hot does your head pipe get?

 

[CRJ]

hot enough that i dont want my hand on it for more than a few seconds.

 

[King Kang]

I rode mine for the first time today, and it definitely hit much harder than the stock pipe. My sizzler had never been installed or ran before, so everything was brand spanking new. My ski is a stock 6m6 with an R&D top loader grate and a 9/15 hooker. Most of the responsiveness was in the mid and top-end but there was some low end punch. I didn't have time to do any carb adjustments- I just ran on the recommendations from the Coffman installation guide. Here is what the pipe looks like installed with the "by the book" water line routing.

 

[Norcaltrd]

Someone said that coffman specified 15ftlbs torque for the exhaust manifold bolts, the Superjet manual specifies 11ftlbs then 22ftlbs sequential.
Can someone confirm which it is?
And red Loctite is specified by Coffman instructions, do you guys suggest red or blue?
Kinda worried to use red because its so damn strong.

 

[King Kang]

I didn't use a torque wrench and I only had blue loctite on hand and I'm hoping that it can withstand the heat. I don't honestly know how you could fit a torque wrench in there to tighten down the manifold bolts.

 

[Norcaltrd]

If the engine is in the hull, you pull the pipe out first and use a 4" extension on your wrench. Except for the top center two, those you just crank on by hand as best you can.
With engine out of the hull its easy, lots of room.

I guess Ill probably use red loctite and torque to specs.
I got a big ass breaker bar if I really need to get them out again. Just hope the bolts wont snap hah.

 

[Quinc]

I wouldn't use red Loctite. I use a tiny bit of blue the bolts haven't budged. (I check torque every 2-3 rides)