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Oil blurp

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jill(at)m-14p.com
Guest

Posted: Tue Jan 08, 2019 8:38 am Post subject: Oil blurp

Hi, Group!



Quick reply, Mark is correct.  I have no idea what "camshaft scavenging" is,

so I may have been misquoted, misinterpreted or there was another source of

that term.  



I will follow up with more comment, when I get a chance.



thank you and Happy new Year!

Jill

Jill Gernetzke

M-14P, Inc.

4905 Flightline Drive 

Kingman, AZ  86401

928-681-4400

www.m-14p.com

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wlannon(at)shaw.ca
Guest

Posted: Tue Jan 08, 2019 9:58 am Post subject: Oil blurp

A bit of clarity here!   The term "camshaft scavenge" sure as hell did not 

come from Jill!  It in fact came from a poster representing "Red Star 

Aviation Service".

Jill knows better that anyone on this list that the "camshaft" in a radial 

engine is a figment of someone's imagination.  It does not exist!



Cheers;

Walt

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migfighter42(at)gmail.com
Guest

Posted: Tue Jan 08, 2019 2:52 pm Post subject: Oil blurp

It was from me. And it’s applicable. I’m in no way a master of the M-14 but all performance engines have a method of valve timing that allows effective high volume airflow through the engine. This will cause, for a very small fraction of time during rotation, both the intake and exhaust valve to be open at the same time. That can add to this problem was the only point I was trying to make. Not sure how this got all out of specification or that anyone was going to get upset by mentioning it. 



Best regards, 



Bill Culberson 

Red Star Aero Services

251/716/8119



[quote] On Jan 8, 2019, at 12:55 PM, Walter Lannon <wlannon(at)shaw.ca> wrote:

 

 

 

 A bit of clarity here!   The term "camshaft scavenge" sure as hell did not come from Jill!  It in fact came from a poster representing "Red Star Aviation Service".

 Jill knows better that anyone on this list that the "camshaft" in a radial engine is a figment of someone's imagination.  It does not exist!

 

 Cheers;

 Walt

 

 

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wlannon(at)shaw.ca
Guest

Posted: Tue Jan 08, 2019 4:48 pm Post subject: Oil blurp

Hi Bill;



My apology.  You are right on.   I guess I fixated on the word "camshaft" 

which does not exist in a radial engine rather than the word "scavenge" 

which in fact does due to normal valve overlap with the intake valve opening 

a few degrees ahead of the exhaust valve closing.

This would tend to move any remaining exhaust / oil residue out of the 

exhaust valve.



Walt



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GeorgeCoy

Joined: 02 Dec 2010
Posts: 310

Posted: Wed Jan 09, 2019 6:19 am Post subject: Oil blurp

Well folks, I have been lurking and listing to this thread. I just want to point out that there is one more item that was not mentioned as to the as to the exhaust burp!. 

	As we all know the air start distributor sends compressed air to the proper cylinder during its expansion or power stroke. That is what turns the engine over for starting. It seems those engineers with thick glasses, pocket protectors and slide rule added one more thing. (and yes I did go to engineering school in the 1960's)They added a second hole in the rotary valve in the air start distributer It is timed to send some compressed air to the bottom cylinders during the exhaust stroke! It is to help remove any oil, excess fuel and other glop that could cause a dreaded hydrolock.



That means the electric start owners need to be even more cautious about pulling that prop through!



George Coy

MotorstarNA

714 Airport Rd.

Swanton VT 05488

802-868-5633 off

802-363-5782 cell

george.coy(at)gmail.com

http://motorstarna.com/

SKYPE george.coy

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