Steel Breather Gear-Brand Preference?
#1
Steel Breather Gear-Brand Preference?
I'm putting in an Andrews EV27 Cam with a Torrington Bearing and going with Adjustable Andrews Push-rods as well. Since were in there I'll change out the plastic Breather Gear too.
What's the preference here on brand of Steel Breather Gears for a 97 EVO?
I did a search but only came up with reference of S&S.
Thanks
What's the preference here on brand of Steel Breather Gears for a 97 EVO?
I did a search but only came up with reference of S&S.
Thanks
#4
Just bought a shovelhead rebuild DVD...to my great surprise, the engine builder recommended staying with the plastic gear. His reasoning was if something comes loose in the motor, and goes thru the plastic gear, it destroys the plastic gear....if it goes thru a steel gear it destroys the case...came from his experience in tearing down dead motors...first I had heard that. That being said, my 84 still has the plastic gear with no problems.
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Hey Man (05-28-2019)
#5
hadn't thought of that re: the plastic gear. I can see that logic. Frankly, I have not heard all that many reports of the plastic failing. I got an s&s steel gear and apparently it does a better job moving the oil through, so that plus steel got me to buy it. I paid 100 bucks, but I think there are cheaper ones out there if you need steal. But i wonder if the whole plastic gear thing is over hyped.
#6
#7
Just bought a shovelhead rebuild DVD...to my great surprise, the engine builder recommended staying with the plastic gear. His reasoning was if something comes loose in the motor, and goes thru the plastic gear, it destroys the plastic gear....if it goes thru a steel gear it destroys the case...came from his experience in tearing down dead motors...first I had heard that. That being said, my 84 still has the plastic gear with no problems.
hadn't thought of that re: the plastic gear. I can see that logic. Frankly, I have not heard all that many reports of the plastic failing. I got an s&s steel gear and apparently it does a better job moving the oil through, so that plus steel got me to buy it. I paid 100 bucks, but I think there are cheaper ones out there if you need steal. But i wonder if the whole plastic gear thing is over hyped.
Guess I'll just spend that C-Note on more fuel & oil.
Thanks
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#8
Actually just the opposite happens...the only real problem with plastic gears... is if you don't keep your oil changed properly...they become imbedded with trash, which makes an effective sanding disc and eats up the bore, the steel ones claim not to do that...but like you said pros and cons.
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Racepres (05-28-2019)
#9
I have seen some very worn plastic breathers over the years, some with missing teeth too! The manufacturers of aftermarket parts do make some fairly suspect claims about their products though.......after all, if you have an oil filter and you occaisionally change your oil there shouldn't be any trash in there and if there was that much it would eat your other bearings too....at least an Evo oil pump can digest plastic without damage ;-)