ADA Girdled VS Non- Girdled

SJet

SJet

Location
Strathroy Ontario Canada
B-Roy said:
So why should I go with a girdled head vs a non-girdled head.

Im running a B-Pipe...

Non Girdled
http://www.adaracing.com/viewitem.php?id=ya701lhdkit&maincat=watercraft

girdled
http://www.adaracing.com/viewitem.php?id=ya701mhdkit&maincat=watercraft
Click to expand...

As you start to add more power to your motor, the more stress there is on the ears that bolt the cyl. down. Without a girdled head YOUR CYL. WILL CRACK. I would run a non girdled head on only a completely stock motor.
 
meatball

meatball

User Title Unavailable
Location
Maryland
wait, so your saying no matter what, unless your running a stock head on a stock engine, you'd run girdled? Little conservative to me.
 
meatball

meatball

User Title Unavailable
Location
Maryland
So is that a yes or what? still unclear as to what you meant. No thanks, already have a 170 psi non-girdled.
 
IceRocket1286

IceRocket1286

Site Supporter
Location
Metro Detroit
I see it like this:

Dry pipe, run a girdled head because they vibrate much worse than a wet pipe or stock pipe, and chances of cracking cylinders are much more. At least on my experience with SXR's.

Wet pipe, run either... a girdle can never hurt, however you dont need it on a simple engine. The more complex your setup is, run a girdle.

Its always better to be safe than sorry, even if it means a couple more bucks. If you do buy a girdle head, you might as well run it with the girdle in use. Luckily with SJ cylinders you dont have to machine them to allow a girdle to fit like you do on kawis.
 
Mouthfulloflake

Mouthfulloflake

ISJWTA member #2
Location
NW Arkansas
with a 61x cylinder, in any configuration other than stock pipe,carb, and head, I would run a girdled head.

But thats just me. ( conservative in this regard)
 
FLY6584

FLY6584

Location
Clearwater, FL
The way I see it is right now you may not necessarily need a girdled head, but eventually you will. Spend a little extra money now so when you do modify your motor more you'll be ready and just for the peace of mind knowing you won't be cracking your cylinder. While it's probably rare to crack a cylinder on a stock engine with a bpipe I'm sure it's still possible.
 
Marshj

Marshj

DarkHorse
Location
Ann Arbor
Freestyle skis generally run lower RPM, therefore not vibrating like many of the higher RPM race motors. Lower RPM means lower chance of cracking. I run a cut stock head, Freestyle geek did for years.

But now my motor is getting to be a stronger setup and it worries me that its my weakspot of the motor. Guess ill just keep the RPM low...riiight
 
norcal ex

norcal ex

X-H2
Location
San Jose, CA
Whoever said it had to do with RPM and vibration does not know what they are talking about. It has to do with that being the weak point of the cylinder and the weight of the exhaust plus the nature of freestyle make the cylinders crack....
 
norcal ex

norcal ex

X-H2
Location
San Jose, CA
IceRocket1286 said:
i dont think the 'nature of freestyle' has anything to do with it, unless your parts are coming loose and banging around breaking eachother.
Click to expand...

Im talking about going vertical, having the ski cme down at high velocitys hitting the water.....compared to regular "stock" riding ( going around the lake in circles) If you dont think that "freestyle" abuses the ski on an entirely new level than it was intended to do, i don tknow what to tell ya!
 
meatball

meatball

User Title Unavailable
Location
Maryland
vibration has everything to do with cracking. Something that vibrates at 10,000 RPM endures more stress then something at 1 RPM. So does impacts like landings, which I'm sure was what you were getting at. Which does more in the long and short run? Who's to say, especially with the variety of different riding styles and environments (flat, surf etc.). I read about cracked cylinders less then random carnage like thrown bearings, so I estimate it a low risk as people run setups like mine without girdled heads, like Marsh and Geek did. I would like a girdled head, but it would cost me about $200 I dont have. Worth it to me to be less safe.

I would say if I did constantly ride 4 foot surf, then I might try and get a girdled head, because I'm sure there are rougher impacts out there then I get on flatwater and jumping cruiser wakes every once in a while.
 
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Boris

Boris

The Good Old Days
Location
The surf-less coast
The way I see it is,
spend the cash on a head with a girdle ($$$$) or
cut your stock head (much less $$$$).


The in-between doesn't make much sense to me.:dunno:
 
Mouthfulloflake

Mouthfulloflake

ISJWTA member #2
Location
NW Arkansas
$200.

but, could you replace the top end for $200?

this is my logic when wanting a girdled head.







meatball said:
vibration has everything to do with cracking. Something that vibrates at 10,000 RPM endures more stress then something at 1 RPM. So does impacts like landings, which I'm sure was what you were getting at. Which does more in the long and short run? Who's to say, especially with the variety of different riding styles and environments (flat, surf etc.). I read about cracked cylinders less then random carnage like thrown bearings, so I estimate it a low risk as people run setups like mine without girdled heads, like Marsh and Geek did. I would like a girdled head, but it would cost me about $200 I dont have. Worth it to me to be less safe.

I would say if I did constantly ride 4 foot surf, then I might try and get a girdled head, because I'm sure there are rougher impacts out there then I get on flatwater and jumping cruiser wakes every once in a while.
Click to expand...
 
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