Superjet Cooling Help / Struggles on sudden WOT

MaxWalker99

MaxWalker99

Location
England, Manchester
Hi there rider from the UK here, first question if anyone can help is: I run dual cooling on my ski (701 superjet B-pipe Etc) but 1 pisser is always spluttering out whilst the other is a constant stream of water even on throttle the bottom pisser barely has any water coming out of it? would a flow control valve fix this? Would this be the reason why the ski after riding for around 10 mins and being thrown around starts to struggle when blipping of the wake?(ski runs great until its thrown around) I have also noticed that steam comes from the bottom pisser that has the lower pressure of water comes out for a good minute after the ski is turned off? I don't think this is a blown head gasket as the engine has just been fully rebuilt including a new crank.

My thinking is that after reading other posts about the flow control valve that it will increase the pressure in the cooling line coming from the other cylinder and not through the B-pipe and therefore even out the amount of water coming from each pisser as water will always go to the area of less resistance?

Thanks in advance sorry if this sounds stupid as this is the first non stock ski I have had and i am far from a genius when it comes to wrenching :) I will try get some video or pics to put up if this would help
 
nucleus_coolins

nucleus_coolins

Does things to makes the do goods
Location
Bay Area, California
Yeah i think your diagnosis sounds accurate. Try adding a FCV or a restrictor jet to the line going into the bpipe stinger.
When waterbox loads up with too much water it can take some high rpms to clear it out before running proper again.

The steam coming out when u kill the motor is probably exhaust coming back thru the line from the stinger since there isnt a FCV there
 
MaxWalker99

MaxWalker99

Location
England, Manchester
nucleus_coolins said:
Yeah i think your diagnosis sounds accurate. Try adding a FCV or a restrictor jet to the line going into the bpipe stinger.
When waterbox loads up with too much water it can take some high rpms to clear it out before running proper again.

The steam coming out when u kill the motor is probably exhaust coming back thru the line from the stinger since there isnt a FCV there
Click to expand...
Thanks alot I will be ordering a FCV asap :)
 
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