Breathers

Reply Subscribe

Thread Tools

Search this Thread

Feb 7, 2019 | 12:06 PM

#41

98hotrodfatboy

Seasoned HDF Member

Joined: Mar 2010

Posts: 21,091

Likes: 7,611

From: Poolville

Quote:

Originally Posted by Racepres

No way in hell yer Harley will even come close to Achieving "negative pressure"... tho logic tells us it may...Experience Shows it is Impossible...Best we can hope is to let 'er breath uninhibited..and trust me... it will all be Exhale!!!
And yes... the head breather would need to be pretty badly Sumped to get oil outside the System...

I bet letting a Stroker Breathe thru those Heads is gonna be challenging... Drag Racers do it completely Differently... But... We ain't racing... just want to do the best we can with what we gots...

That would be correct on the negative pressure crankcase. And don't forget the amount of blow by on the rings.. years ago they Incorporated the PCV valve to perform 2 functions, one was to help evacuate the Positive Crankcase pressure and the other one is too recycle the unburned has trapped gases in the Crankcase. That's pretty much what the head breather does.... EPA...

As for the stroker and breathing, it's also bored which means more volume as well. I only have issues at higher RPM......

Feb 7, 2019 | 01:30 PM

#42

jf7689

Thread Starter

Cruiser

Joined: Mar 2015

Posts: 104

Likes: 3

From: North Ridgeville, OH

Man thank you guys. Some of this is pretty advanced; but I love what I'm learning. So as I'm reading through the thread, I've started asking myself why I have an oil cooler even on the bike. 89, fxstc CV carb swap out and some V&H short shots. Oil cooler is the style that was probably put on in 1989 as well. Living in Cleveland, OH. I'm starting to think the cooler isn't worth having on it. Thoughts?

Last edited by jf7689; Feb 7, 2019 at 01:31 PM.

Feb 7, 2019 | 01:39 PM

#43

98hotrodfatboy

Seasoned HDF Member

Joined: Mar 2010

Posts: 21,091

Likes: 7,611

From: Poolville

Oil cooler is a good thing...........................

Feb 7, 2019 | 02:07 PM

#44

texashillcountry

Dirt don't hurt

Joined: Jan 2011

Posts: 21,065

Likes: 4,561

From: Haslet Texas

Quote:

Originally Posted by jf7689

Man thank you guys. Some of this is pretty advanced; but I love what I'm learning. So as I'm reading through the thread, I've started asking myself why I have an oil cooler even on the bike. 89, fxstc CV carb swap out and some V&H short shots. Oil cooler is the style that was probably put on in 1989 as well. Living in Cleveland, OH. I'm starting to think the cooler isn't worth having on it. Thoughts?

While I probably wouldn't buy one if I lived that far north but since you already have it then keep it as it can only help and damn sure won't hurt.

Feb 7, 2019 | 02:38 PM

#45

splattttttt

Ultimate HDF Member

Joined: Jul 2014

Posts: 5,649

Likes: 430

From: MASS_hole

No oil cooler on my 103 and she’s always nice and cool. And I’m s hot rodder too.
Not that it would hurr. There may always be that one time...

Feb 7, 2019 | 05:20 PM

#46

Racepres

Seasoned HDF Member

Joined: Jul 2014

Posts: 8,590

Likes: 3,360

From: Cental, MI

I disagree that oil coolers are Good... necessary Evil, if ya live where it is hot... But... again... anything at all in the oil return line is a bad thing... Wonders why the MoCo decided to put the oil filter there... ensure you have the Absolute correct oil filter in place, and if Unnecessary... why plug up the return line with a Cooler...

Feb 7, 2019 | 06:00 PM

#47

98hotrodfatboy

Seasoned HDF Member

Joined: Mar 2010

Posts: 21,091

Likes: 7,611

From: Poolville

When it comes to oil coolers.......... To each their own........ That's all I'l say............................................... .........................................

Apr 9, 2019 | 10:44 PM

#48

Crazy16

6th Gear

Joined: Apr 2019

Posts: 11

Likes: 0

From: Pa

Any idea what would cause a case breather on a 91 with a steel Jim’s breather to eat into the case a little bit and basically get stuck almost like it’s welded there it won’t turn or come out move at all