Blowby

[Lubener]

My old 87 f150 w/4.9L is starting to exhibit some blowby. The breather gets blown out of the valve cover (it fits in tightly) and I get a small amount of oil in the breather filter. The engine consumes very little oil, about a half quart every 2500 miles. PCV system is working but I would like to try a "high flow" PCV valve. Does anyone have a OEM or Fram number I can go from that might work?

 

[spasm3]

You could use a fixed orifice pcv valve with no check valve. You can drill it in increments till you got what you want. Would have some pcv flow all the time.

You will need to check the fit. Fram FV410
https://www.amazon.com/FV410-Positive-Crankcase-Ventilation-Valve/dp/B0010DW658

 

[mattd]

Is it causing seals to leak as well?

 

[Talent_Keyhole]

Originally Posted by Lubener
My old 87 f150 w/4.9L is starting to exhibit some blowby. The breather gets blown out of the valve cover (it fits in tightly) and I get a small amount of oil in the breather filter. The engine consumes very little oil, about a half quart every 2500 miles. PCV system is working but I would like to try a "high flow" PCV valve. Does anyone have a OEM or Fram number I can go from that might work?


Try a dual stage, adjustable PCV valve made by ME Wagner http://mewagner.com/

The last PCV valve you will need to buy.

A fixed orifice PCV valve will not work well at higher speeds and loads due to low intake vacuum. That is when you need crankcase ventilation the most when blow-by is greatest.

 

[Chris142]

If it's that bad run a road draft tube.