In a message dated 2/6/2006 8:16:53 PM Eastern Standard Time,=20 bbradburry@allvantage.com writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>Is=20 anyone familiar with how to remove the plastic oil fill inlet on=20 the
Renesis. I hate to take a chance on breaking the plastic, so=20= if=20 anyone
knows how it removes??
I also wonder the same thing about the= 2nd=20 gen 13B. It has a metal
inlet, and would probably be removed in a= =20 similar manner.
Tracy, you cut yours off on the Renesis and have=20 expressed
dissatisfaction with the result. Oil blowby, I think.&n= bsp;=20 how did you do
yours?? I am thinking about trying to modify the 2= nd=20 gen inlet for the
Renesis. Has anyone done this? What excel= lent=20 ideas are out there for
lowering this inlet?
Bill=20 Bradburry

Blowby is a natural outcome of leakage of combustion gas past the=20 corner, side seals, and oil scrapers. The older the engine, the bigger=20= the=20 gaps between the side seals and side seals, and that means more blowby.

So, when I build an engine, I use zero clearance between the corner and= =20 side seals. So long as I can depress the corner and side seals together and=20= have=20 them pop back up by themselves, it will be a screamer, and have zilch=20 blowby.

The problem with blowby is that the stock breather is about 1/4" ID and= =20 therefore the flow velocity is high enough to carry away any liquid oil in t= he=20 filler neck. Even race engine builders seldom use more than a dash 10 hose f= or=20 the breather.

I use a dash 8 hose assembly but I have no breather issues with the dry= =20 sump pump. The breather hose actually sucks oil and vapor from the storage t= ank=20 into the sump area, because the scavenge section displaces far more than the= =20 blowby.

If you must shorten the filler neck then I would leave the cap off and=20= use=20 a formed 90 hose over the end of the neck. The bigger the diameter the lower= the=20 velocity of the blowby, and the smaller the amount of oil it can pull out. T= his=20 is a big improvement for piston engines also. If you run a crank trigger, yo= u=20 can use the distributor hole as another breather location. You might want to= =20 mount a baffle plate on the inside so the gear cannot sling oil directly up=20= the=20 hole. If nothing seems to stop it, you can use a real airplane oil separator= and=20 run the recovered oil back into the sump.

The taller the filler neck and the closer to the top the breather fitti= ng=20 is mounted the better.

Even in the cap would be good.

The filler necks are pressed in, and can come out without notice. You c= an=20 weld or braze on a couple of tabs and wire it down. I have never worked with= the=20 plastic parts, so I cannot help there.

Lynn E. Hanover

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