The Ford Barn

sphanna · 09-29-2010, 04:29 PM

I am thinking of drilling a hole in the intake manifold similar to the vacuum source for the windshield wiper. Then pipe threading a line from there through the valve cover to draw crankcase vapors into intake manifold to be burned. Does this sound like a good idea or is there something I should know better than this? Advise? Yea or Nay?

Steve Hanna

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Gerard · 09-29-2010, 04:59 PM

DON'T do this. the chances are very high to burn motor oil instead of fuel specially with a older engine .

Art Bjornestad · 09-29-2010, 05:04 PM

Why do you say no? Is the vacuum to high? I would think a PVC valve might be fitted.

Mike V. Florida · 09-29-2010, 05:08 PM

I have this in my records;

Special Coupe Frank · 09-29-2010, 05:50 PM

You would want to fit a PCV valve; just drilling a hole and running a pipe from the valve-chamber / crankcase to the intake would result in a serious vacuum "leak", really compromising performance.

A PCV valve actually allows a small "bleed" during periods of high manifold vacuum ( little load), and opens-up during periods of low intake vacuum, such as hard pulls, when blow-by is likely to be greater.

You really need the PCV Valve.

What is your goal ? Done properly, it would be a general improvement (help scavenge blow-by vapors / moisture from the crankcase, particularly important if your car only sees short local trips, and never gets out for regular runs lasting a 1/2-hour or more. This would be even more true if you are not running a thermostat.

SC Frank

sphanna · 09-29-2010, 10:26 PM

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Thank you all for your input. SC Frank,I understand now the need for a PCV. I was wondering about that. My intent was to keep my crankcase very clean. I change oil at 500-750 miles and have been a little fanatical about keeping my engine free from sludge and acid from moisture. However I drive it a lot , about 3500 miles a year and mostly on trips of at least 25 miles. So I see that I would not gain much by this. You have all given me reason to forget it. I like to tinker with my coupe and sometimes go overboard. Thank you all for your responces.

Special Coupe Frank · 09-29-2010, 10:52 PM

Steve,

An accessory oil breather tube (available from Brattons, SNyders, and others) that clamps onto the oil fill pipe would probably help as much as anything; in addition to directing blow-by down under the car, the air rushing past the end of the pipe when the car is in motion creates a partial vacuum, thus drawing fumes / air from the crankcase...

Some makers referred to it as the "road-draft tube"...

I am also a big advocate of using a thermostat, or some other means to get the engine temp up to 160-180* quickly, and keep it there.

I just installed a 160* stat ( with two 1/8" bleed holes) in my upper hose, and the car is up to 160* within five-six minutes running, and maintains 160-170*; previously, with the onset of cooler weather (60* ambient air temp). I could drive around town all down and never break 140*... too cold for my comfort.

sphanna · 09-29-2010, 11:12 PM

Frank,

Yes, I have a 160 thermostat also. Thanks, I will check on the "road draft tube".

Tom Wesenberg · 09-30-2010, 01:10 AM

My well worn noise engine doesn't leak a drop of oil. it came with a road draft tube, so I just left it on there. It does it's job just fine.

09-29-2010, 04:29 PM	#1
sphanna Senior Member Join Date: Jun 2010 Location: Polk City, Iowa Posts: 526	Crankcase vacuum vent I am thinking of drilling a hole in the intake manifold similar to the vacuum source for the windshield wiper. Then pipe threading a line from there through the valve cover to draw crankcase vapors into intake manifold to be burned. Does this sound like a good idea or is there something I should know better than this? Advise? Yea or Nay? Steve Hanna . __________________ Steve Hanna, Polk City, IA

09-29-2010, 04:59 PM	#2
Gerard Senior Member Join Date: May 2010 Location: Creston Canada BC Posts: 609	Re: Crankcase vacuum vent DON'T do this. the chances are very high to burn motor oil instead of fuel specially with a older engine .

09-29-2010, 05:04 PM	#3
Art Bjornestad Senior Member Join Date: May 2010 Location: Westlake Village, CA Posts: 477	Re: Crankcase vacuum vent Why do you say no? Is the vacuum to high? I would think a PVC valve might be fitted.

09-29-2010, 05:50 PM	#5
Special Coupe Frank Senior Member Join Date: May 2010 Location: Northeast Penna Posts: 2,108	Re: Crankcase vacuum vent You would want to fit a PCV valve; just drilling a hole and running a pipe from the valve-chamber / crankcase to the intake would result in a serious vacuum "leak", really compromising performance. A PCV valve actually allows a small "bleed" during periods of high manifold vacuum ( little load), and opens-up during periods of low intake vacuum, such as hard pulls, when blow-by is likely to be greater. You really need the PCV Valve. What is your goal ? Done properly, it would be a general improvement (help scavenge blow-by vapors / moisture from the crankcase, particularly important if your car only sees short local trips, and never gets out for regular runs lasting a 1/2-hour or more. This would be even more true if you are not running a thermostat. SC Frank

09-29-2010, 10:26 PM	#6
sphanna Senior Member Join Date: Jun 2010 Location: Polk City, Iowa Posts: 526	Re: Crankcase vacuum vent Sponsored Links (Register now to hide all advertisements) Thank you all for your input. SC Frank,I understand now the need for a PCV. I was wondering about that. My intent was to keep my crankcase very clean. I change oil at 500-750 miles and have been a little fanatical about keeping my engine free from sludge and acid from moisture. However I drive it a lot , about 3500 miles a year and mostly on trips of at least 25 miles. So I see that I would not gain much by this. You have all given me reason to forget it. I like to tinker with my coupe and sometimes go overboard. Thank you all for your responces. __________________ Steve Hanna, Polk City, IA

09-29-2010, 10:52 PM	#7
Special Coupe Frank Senior Member Join Date: May 2010 Location: Northeast Penna Posts: 2,108	Re: Crankcase vacuum vent Steve, An accessory oil breather tube (available from Brattons, SNyders, and others) that clamps onto the oil fill pipe would probably help as much as anything; in addition to directing blow-by down under the car, the air rushing past the end of the pipe when the car is in motion creates a partial vacuum, thus drawing fumes / air from the crankcase... Some makers referred to it as the "road-draft tube"... I am also a big advocate of using a thermostat, or some other means to get the engine temp up to 160-180* quickly, and keep it there. I just installed a 160* stat ( with two 1/8" bleed holes) in my upper hose, and the car is up to 160* within five-six minutes running, and maintains 160-170; previously, with the onset of cooler weather (60 ambient air temp). I could drive around town all down and never break 140*... too cold for my comfort.

09-29-2010, 11:12 PM	#8
sphanna Senior Member Join Date: Jun 2010 Location: Polk City, Iowa Posts: 526	Re: Crankcase vacuum vent Frank, Yes, I have a 160 thermostat also. Thanks, I will check on the "road draft tube". __________________ Steve Hanna, Polk City, IA

09-30-2010, 01:10 AM	#9
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Crankcase vacuum vent My well worn noise engine doesn't leak a drop of oil. it came with a road draft tube, so I just left it on there. It does it's job just fine.