Octane snow sled big bore??

[cjbchopper]

I actually need a piston for this big bore top end, but I don't know where to get it. It is a Weisco, says 88.82 on the top. I have looked into ordering one and can't find one. Anyone have experience? RKM??

 

[cjbchopper]

Mocking it up...May need to run a dry pipe with the side draft manifold. Not sure if the B pipe head pipe is going to hit the PVs. I am running the water into the stock polaris snowmobile water log intake into the case. Simple install, just need to also run cooling water to the exhuast mani because it will be seperate from the cylinders.

 

[FlightRisk]

Octane Porn.

:Banane35:

 

[NathanMoore]

i found this site for snow mobile motors...i think they are pretty much the same motor???!!!
big bore kit for like 1800$ i would do it but maybe have a x-scream or someone port it!

psipowerinc.com

The "Dial A Dome" head on that site seems very cool...would love to have one on my ski. http://www.psipowerinc.com/store/catalog/advanced_search_result.php?keywords=dial

 

[cjbchopper]

Dial-a-domes are rather neat, but not worth $600 unelss your always changing elevations. They work great on sleds in mountains to change compression on the fly. The exhaust valves on the VES sled motors are huge, they are not going to work with the B-pipe. I am going to fab up some different valve covers and see if we can get them to clear the pipe.

 

[jetski9010]

can you get the B pipe head pipe cut just like the superjet guys do it to clear the powervalves. Those look like the same powervalves as on the eme motors how are they doing it.

 

[jetski9010]

Or you could go with the power factor pipe. It would clear the powervalves and also work better on the bigger bore motor its just that the pipe is $1450.00

 

[Billybo455]

any update cj?

 

[Grant]

Very cool!

 

[cjbchopper]

I have decided to go with a non powervalve setup. I just can't really figure out how to get the head pipe to clear the valves. I was going to simply pin the valves in the closed positon and remove the top parts. It looked like that was not going to work because the exhaust gasses would burn up the valve at WOT. I am going to have two non-pv cylinders bored and replated to accept the 90mm pistons.

 

[cjbchopper]

The other option is I get my dry pipe back from Thundercat! The dry pipe mani would clear the vavles no prob. We just could get not bottom end from that dry pipe with the stock motor. Might have to try the PV setup with the dry pipe and dual 48 novi's.

 

[FlightRisk]

The Kawi headpipe is taller...maybe an option??

 

[cjbchopper]

Could be....Did you get a chance to run your ski yet? Your going to love the 46's.

 

[jetski9010]

I have decided to go with a non powervalve setup. I just can't really figure out how to get the head pipe to clear the valves. I was going to simply pin the valves in the closed positon and remove the top parts. It looked like that was not going to work because the exhaust gasses would burn up the valve at WOT. I am going to have two non-pv cylinders bored and replated to accept the 90mm pistons.

How close are you to clearing the powervalves? What is you got one of these? http://www.x-h2o.com/threads/52250

 

[FlightRisk]

Could be....Did you get a chance to run your ski yet? Your going to love the 46's.

Still in the middle of the rebuild! Crankshaft is on the way. I can't wait to try the Mikuni's out.

 

[cjbchopper]

I would need about 5 of those spacer plates to lift the head pipe up enough. I would need to raise it up about 2" to clear the PV. It could be done, but that would change the exhaust characteristics a good amount. I will get er done eventually.

 

[rkm]

The non pv cylinders can make more power reliably than the ves cylinders.

 

[jetski9010]

I would need about 5 of those spacer plates to lift the head pipe up enough. I would need to raise it up about 2" to clear the PV. It could be done, but that would change the exhaust characteristics a good amount. I will get er done eventually.

Might look stupid but adding a 2 inch spacer to clear the powervales would be turing your mod chamber into a limited chamber.

 

[patatak 111]

Hello guys..
I live in France and i work somes times with Pascal Barriac...
Pascal is a french mechanic manager of Yvan Potanina...
Yvan was begening on EME boat in 2006...
The EME engines are based on Polaris watercraft bottom engine and "thecrankshop" kit cylinder in 990cc (76 x91mm) and now (78 x 93mm), crankshaft made by "crankworks"...
On the photo, you can see this engine in Lenzi boat for Potanina for Havasu 2008..you can see 2 water cooled arrived in stock crankcase watercraft Octane and not in the cylinder...
the polaris watercraft and snowmobile are the sames....
for stroker use in 76mm and 78mm, the crankcase is very fine and fragile, lot of problem on potanina engine...78mm stroke is a maximum stroke you can use in stock Polaris case modified...

 

[patatak 111]

so i have tested in a first time a PSI cylinder kit in 866cc in 2008 in my Octane...(stock stroke and 88,75mm pistons...)
88,75 mm is a maximum size use in snowmobile cylinder...