ctuck0659

Got it; Thanks all-

Bawana

Your welcome... And by the way those 500efi motors are a great motor, I would take them over the 525efi any day of the week.

apollard

Even if you run valve cover breathers, you'll be burning the crankcase fumes since it has a PCV valve. If you eliminate the PCV system, it might upset idle depending on how the EFI is setup.

Bawana

It will have no efect on Idle. Also more of a bad thing only make things worse.

apollard

Maybe not, but I've seen it happen on other speed-density EFIs when the PCV got clogged.

Bawana

Your talking PVC, and I agree to that. But we are talking about the vale cover breathers, whereas, you would not be pluging them at all. You would just be letting them breath into a barff tank or just out of a breather. Not directed to the flame arrestor to be re-burnded, and reduce performance; Also raising the chance of detonation.

ctuck0659

I appreciate all the info, but I'm still a little confused: You got blow-by gasses creating positive pressure in the crankcase which is plumbed through the PCV valve to the intake plenum which has negative pressure/ vacuum. So if the fumes are being sucked into the intake plenum, what's the purpose of the breathers?

Unlimited jd

iTrader: (5)

Let fresh air in and balance the crankcase pressure with atmosphere

ctuck0659

OK, thanks. That's kinda what I was thinking. So they shouldn't really vent many crankcase fumes unless you've got a ring problem with so much blow-by the PCV can't keep up.