M3 Ventilator - possible help from sumping?

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Mar 29, 2019 | 03:02 PM

#41

cmashark

Road Warrior

Joined: Dec 2007

Posts: 1,498

Likes: 213

From: Atoka, TN

Quote:

Originally Posted by Tn.Heritage

I don't understand why everyone is wanting to do this until someone shows a bike sumping on the dyno, then put the vented cap on and bam, no more sumping.
Seems everyone is putting the cart before the horse !

Quote:

Originally Posted by Tn.Heritage

Rin Tin, I'm asking a question as well. I do not understand why everyone is jumping on the venting bandwagon through the dip stick area when it's not proven to help sumping as some have stated. Yes a bike can sump on a dyno but that's what I'm asking. Whats the proof that the venting will help prevent sumping ?

Not sure how far from Memphis you are, but you’re welcome to check mine out. You’d be surprised at the volume of air that is exchanged at this vent location. You can really feel it at idle. Only one of my M8’s ever sumped unintentionally. I’m looking to see if it has any effects on engine temps and oil in the intake. Someone else can investigate the sumping part.

Mar 30, 2019 | 08:16 PM

#42

Vision

Road Captain

Joined: Jan 2015

Posts: 626

Likes: 109

From: New York

Quote:

Originally Posted by Vision

I don’t know about it sleeping with the tube routed so high above the oil tank. That would truly suck!unless I’m more concerned with the smell this thing might put out. Lol. Because my bike is a big bore setup that has sumped and I remember how much air pressure was in the oil tank the day it happened along with knowing that this type of venting is nothing new to Harley; even from the factory on some older models I’ve seen, I’m going to try it or something similar in hopes of a little more insurance to protect my investment.

I have to eat crow on this. I received the ventilator and installed it a few days ago. Had to remove it today. Turns out it was spewing oil out the ventilator. I actually had to add oil after riding today. I just changed the oil last week. I will stick with my external engine breather setup. What's strange is that I've no pressure at all building up on my oil cap after riding hard with the Feuling oil pump on like I did before my rebuild with the stock pump. However, oil was still being pushed out the ventilator. Would love to hear from others with big bore builds that have tried the vent.