Can I reroute the "mini" exaust pipe?
Thread Starter
|
Logistics Pro
Joined: Jan 2001
Posts: 3,789
Likes: 26
From: Connecticut
Can I reroute the "mini" exaust pipe?
On the 239 Flathead, the small pipe (about 1.5" dia) at the bottom, front drivers side. A fair ammout out smoke comes out.
What about bringing that back up to the 1-bbl carb, like an EGR?
Will that do any good to reduce the smog effect?
thanks
Reamer
What about bringing that back up to the 1-bbl carb, like an EGR?
Will that do any good to reduce the smog effect?
thanks
Reamer
New User
Joined: Oct 2004
Posts: 22
Likes: 0
From: ZIP CITY AL
Hey Reamer, I believe what you are referring to is the crankcase ventilating tube (technically the "road draft tube" )on your flathead. The precursor to the PCV/EGR, most folks are more familiar with now. You probably have a 2-bbl carb on the engine and it is an easy task to install a PCV valve on this engine. Search for PCV valve at www.fordbarn.com/earlyv8/forum , you will find a number of solutions that others have come up with that are ver effective. Keep on truckin.
Postmaster
Joined: Mar 2000
Posts: 3,730
Likes: 13
From: Waynesville, OH
I've been thinking about the fumes coming from the road tube as well. I really want to keep the stock road tube, but I hate the idea of all that crud coming up in the engine compartment and making a mess.
Since the stuff coming out is about at the coolant or oil temperature (not exhaust temperature), I've been thinking of using a length of heater hose to route the road tube output to the side in the wheel well. When I want to show the truck, I can take off the heater hose and have a stock engine. I haven't really thought this totally through, so I'd appreciate any comments.
Reamer, I don't want to hijack your thread. Should I start a new thread for this, or is it close enough to your original question?
Since the stuff coming out is about at the coolant or oil temperature (not exhaust temperature), I've been thinking of using a length of heater hose to route the road tube output to the side in the wheel well. When I want to show the truck, I can take off the heater hose and have a stock engine. I haven't really thought this totally through, so I'd appreciate any comments.
Reamer, I don't want to hijack your thread. Should I start a new thread for this, or is it close enough to your original question?
Lead Driver
Joined: Oct 1999
Posts: 6,776
Likes: 553
From: Kalispell, MT
Reamer, check out my gallery under the '48 "Wendy" and you'll see a couple of pictures of my pcv system that I've run for over 3 years. I pulled the road draft tube, installed a pcv plug/valve that fits snug in the RD hole. Connected a piece of 5/8" hose and ran it back to the intake manifold where I had a pipe plug. Replaced the plug with a nipple and connected the hose.
Don't connect the pcv to the carb - you'll plug the carb. It needs manifold vacuum to work properly. I've heard concerns that it'll lean out the mix, but I haven't seen any problems along those lines.
The dirt and crud under the hood is the result of 3 years of a front seal leak + a radiator leak + living on a dirt road.
Don't connect the pcv to the carb - you'll plug the carb. It needs manifold vacuum to work properly. I've heard concerns that it'll lean out the mix, but I haven't seen any problems along those lines.
The dirt and crud under the hood is the result of 3 years of a front seal leak + a radiator leak + living on a dirt road.
Lead Driver
Joined: Oct 1999
Posts: 6,776
Likes: 553
From: Kalispell, MT
Sorry, I put that together almost 5 years ago. It was just off the shelf grommet and a 90* pcv valve for a similar cid engine. Couldn't tell you what it was for. Picked them up at the local CarQuest parts house. I just walked thru the store and pulled them off the rack. It's not too particular from what I've seen.
Trending Topics
Posting Guru
Joined: Apr 2004
Posts: 1,908
Likes: 2
From: Seattle WA.
[QUOTE=mtflat]Reamer, check out my gallery under the '48 "Wendy" and you'll see a couple of pictures of my pcv system that I've run for over 3 years. I pulled the road draft tube, installed a pcv plug/valve that fits snug in the RD hole. Connected a piece of 5/8" hose and ran it back to the intake manifold where I had a pipe plug. Replaced the plug with a nipple and connected the hose.
Don't connect the pcv to the carb - you'll plug the carb. It needs manifold vacuum to work properly. I've heard concerns that it'll lean out the mix, but I haven't seen any problems along those lines.
I looked at your picture of the PVC installation. If memory serves me right you also need an oil filler cap with the hose connection, and hose, that runs up to the air cleaner. The draft tube connection won't pull the fumes out fast enough under throttle when engine vacuum is low. That is when the hose going to the air cleaner takes over.
I can remember my dad telling me of an engine that blew the pan gasket because of the PVC pressure buildup.
That is the basic PVC setup you find on most SBC's of the late 50's and early 60's
Don't connect the pcv to the carb - you'll plug the carb. It needs manifold vacuum to work properly. I've heard concerns that it'll lean out the mix, but I haven't seen any problems along those lines.
I looked at your picture of the PVC installation. If memory serves me right you also need an oil filler cap with the hose connection, and hose, that runs up to the air cleaner. The draft tube connection won't pull the fumes out fast enough under throttle when engine vacuum is low. That is when the hose going to the air cleaner takes over.
I can remember my dad telling me of an engine that blew the pan gasket because of the PVC pressure buildup.
That is the basic PVC setup you find on most SBC's of the late 50's and early 60's
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Posting Guru
Joined: Apr 2004
Posts: 1,908
Likes: 2
From: Seattle WA.
Originally Posted by reamer
Hi mtflat
Do you have a part # for the pcv you used?
How about a photo of the valve?
I'd like to try ypur hook up.
Thanks
Reamer
Do you have a part # for the pcv you used?
How about a photo of the valve?
I'd like to try ypur hook up.
Thanks
Reamer
As I recall there is a certain hole size in the draft tube to manifold connection, for different engines. So only a certain amount of air could come through. So the engine wouldn't run too lean. You will need the oil filler cap with hose running to the air cleaner also.
I recall my dad looking up the hole size specs somewhere. I can't recall exactly what he was looking in, to many years have gone by. He did have a bunch of Motor Manuals though. I want to install the PVC unit myself on my 51 6 cylinder. So if you find out anything please post them, or e-mail me.
Fleet Mechanic
Joined: Jun 2004
Posts: 1,777
Likes: 42
From: Minnesota
The hose going to the air cleaner is not supposed to take over. The ventilation system is supposed to suck air from the oil filler tube through the crankcase and out the pvc valve. The hose being in the air cleaner provides clean fresh air so you are not sucking dirt into the crank case. If you have oil in the air filter from the tube you either have a PCV valve that is sticking so the blow by from the engine is causing pressure and pushing the fumes back into the air filter. Or a engine that is so badly worn that the PVC system cannot keep up with the amount of blow by. I guess there is a third in this case, the PCV system is undersized and not keeping up if you have known good motor. I once had a motor that was so worn that I was getting oil into the airfilter. I put a second PCV valve in and "T" it into the the original PCV
Lead Driver
Joined: Oct 1999
Posts: 6,776
Likes: 553
From: Kalispell, MT
I can see a potential problem with older flatheads, but not the later 8BA series. I could see someone with a 59 series or earlier engine running a pcv system and electric fuel pump where they've capped off the crankcase ventilation system for looks - that might blow a pan off. Or an earlier intake on an 8BA.
The F-series trucks (48-54) with V8 flatheads have a screened fresh-air intake right beside the road draft tube. Mine is intact and would provide the same thing you guys are talking about with the extra tube to the carb filter area. I agree with the concept, it just isn't necessary with the 8BA/8RT flatheads IF you leave the stock oil tube/cap in place.
With this system during low vacuum intervals, crankcase pressure can either push past the pcv valve OR back up and out the oil breather.
The F-series trucks (48-54) with V8 flatheads have a screened fresh-air intake right beside the road draft tube. Mine is intact and would provide the same thing you guys are talking about with the extra tube to the carb filter area. I agree with the concept, it just isn't necessary with the 8BA/8RT flatheads IF you leave the stock oil tube/cap in place.
With this system during low vacuum intervals, crankcase pressure can either push past the pcv valve OR back up and out the oil breather.
Last edited by mtflat; Jan 18, 2005 at 11:00 AM.
