Hey, what's the scoop on the "oil reduction jet for cylinder head" listed in the Pami stage 1 kit? What exactly does it do, what is it for? I'm talking about the reduction jet in the head, not the valve for higher pressure included in the stage 2 & 3 kits.
Its name implies it "reduces" oil flow to the head - if so, why? Is there more than enough flow there already, and decreasing it increases flow to the bottom end components?
Thanks

 

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it slows the oil down to the head so you dont punp it all to the top on the engine at long high rpm runs.

 

the kit comes with a higher pressure oil pump and the jet in the head is needed to reduce excessive oil flow to the head

 

Below is the list of what you get in their stage 1 kit - no oil pump mods, just the reduction jet for the head like I mentioned above.
I have everything in this kit except the reduction jet, and I'm now wondering if I should buy it and install it, but other engine builders don't give it any thought. Can't decide if its really necesary, seems Rotax would have designed their motor with the proper lube requirements in the first place so its hard to take somebody elses word over theirs. The BMW bike runs at higher rpms than the DS, so I don't think I can blame it on the low rev limit ellimination as being the cause for lube mods - what do you all think?

265,---€ forged piston, 12 : 1 compression rate, without ring set
47,---€ machining of the cylinderhead squish,

480,---€ carburator kit dia 45mm, complete

47,---€ a set of special clutch springs,

28,---€ cylinderhead gasket,
7,---€ cylinder base gasket,

11,---€ clutch cover gasket,
19,---€ oil reduction jet for the cylinderhead, with boring
18,---€ 6 ea special washers for the valve cover,
48,---€ K&N direct mount air filter,

300,---€ ignition box, modified
80,---€ engine disassembling - for this kit
170,---€ engine assembling

 

looking at pami's site the 56hp kit is the only one without a modified oil valve. both big bore kits have the modified oil valve for higher oil pressure, and the oil reduction jet. not sure why the 56hp kit has the reduction jet? gottfried told me it was there because of the extra oil pressure.

 

If you have a Pami Head, the oil port will be drilled out for a reduction jet. I don't believe it is a different pump. Higher oil pressure is created by the smaller diameter hole resulting in more of a mist of oil being sprayed over the cams.

I got my head from Pami and they shipped the jet loose (still not sure why.) I didn't install the head originally and came to find out later that the jet wasn't installed. I am still running without the jet installed so I am probably getting excessive oil flow on the top end resulting in a slight loss in power.

Hightower, I wouldn't worry about doing anything. You are getting plenty of lubrication now and you would need to have your oil port drilled out to get the reduction jet in. I seriously doubt you are losing much (if any) power because you have too much oil flowing over your cams.

Jeff and I have found that these jets can play hide and seek very well when they pop out of the head. If you pop your head onto the cylinder without having the engine mounts loose watch out, that little bit you have to pop the head to get it past the crossmember in the frame can cause the jet to pop out resulting in about a 1-1/2 hour "delay of game."

When you step-up to the race head then go ahead and get the oil reduction jet. That way when you are ready for your next step (760) you will already have the race head complete.