Another exhaust question
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From: Revelstoke B.C.
Another exhaust question
Carburated 300I6,1976 F250 4x4-
I have been looking into putting 2.5" Wallker down pipes,y'd into single exhaust on my truck.I went and spoke with my exhaust guy yesterday,and the main question he has is,"How am I supposed to incorpoate the stock intake with the Walker's?".Can this be done or what?The other 300's I've seen with this set up have used the EFI system with a 4bbl on top.Any Idea's?I don't want to go to that extent,I just want to get the 300 to breathe better.
I have been looking into putting 2.5" Wallker down pipes,y'd into single exhaust on my truck.I went and spoke with my exhaust guy yesterday,and the main question he has is,"How am I supposed to incorpoate the stock intake with the Walker's?".Can this be done or what?The other 300's I've seen with this set up have used the EFI system with a 4bbl on top.Any Idea's?I don't want to go to that extent,I just want to get the 300 to breathe better.
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I think it should just bolt up. They use common studs with donuts to hold both on the block at the same time. It would seem to me that doing just an exhaust won't really help it breathe much better. Aftermarket intakes have HUGE runners compared to stock.
Are you keeping the stock intake because you are doing it one piece at a time, and will upgrade later?
Are you keeping the stock intake because you are doing it one piece at a time, and will upgrade later?
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From: Revelstoke B.C.
I orinally wanted to upgrade all at once,new cam,exhaust all the goodies.When I spoke with a performance guy he suggested changing the cam,get it ported do the exhaust but stay with the stock intake and 1bbl.So,I thought since I need new exhaust,I would go with the Walker's now.The exhaust guy is concerned about separating the exhaust manifold from the intake manifold.He think's that there will be problem's because the Walker's don't connect to the intake,and the stock exhaust manifold does.There could be something here I dont understand,so let me know if I'm missing something on this.
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From: Revelstoke B.C.
This is the only picture I can find so far that show's the Walker's.This guy used the EFI set up with a 4bbl.If anyone has done this using the stock intake a picture or two would be great.
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From: Lost
The stock exhaust manifold attaches to the the intake, in order to provide some heat, thereby eliminating the possibility of carb icing. Most aftermarket intakes need a heated carb spacer to do the same.
Your exhaust guy is correct, there could be issues arising from swapping out the exhaust manifold, if you don't provide another source of heat to the intake.
I don't know what the weather is like in your part of the world, but I can suffer from carb icing issues in my RX7 when it's as warm as 45F here. Since I don't drive it much in winter, I live with it. I blocked off the coolant passages that normally flowed thru the intake. The minor annoyance of carb icing is worth having the extra power it makes when the temp is near 100F in the summer. Even 100F air is denser than 180F air is......
Swapping to the EFI exhaust manifolds, and leaving the stock intake *could* lead to carb icing, especially during the cooler months.
Your exhaust guy is correct, there could be issues arising from swapping out the exhaust manifold, if you don't provide another source of heat to the intake.
I don't know what the weather is like in your part of the world, but I can suffer from carb icing issues in my RX7 when it's as warm as 45F here. Since I don't drive it much in winter, I live with it. I blocked off the coolant passages that normally flowed thru the intake. The minor annoyance of carb icing is worth having the extra power it makes when the temp is near 100F in the summer. Even 100F air is denser than 180F air is......
Swapping to the EFI exhaust manifolds, and leaving the stock intake *could* lead to carb icing, especially during the cooler months.
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From: Revelstoke B.C.
I have carb iceing issues here aswell.I think I will stay with the stock exhaust manifold at this point.I'll probably go with header's later in life.I am hopeing that I can still go to 2 1/2" though.
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From: Spokane, WA
Your picture is showing the stock EFI manifolds and that is what works with the Walker Y pipe.
An Offy intake will bolt to the stock log manifold but if you use the EFI's you can fabricate a plate fixed with hose barbs that attaches to the bottom of the Offy for intake heat or use a water heated carb spacer from a 60's Ford V-8. A Clifford manifold can be had already plumbed for water heat.
An Offy intake will bolt to the stock log manifold but if you use the EFI's you can fabricate a plate fixed with hose barbs that attaches to the bottom of the Offy for intake heat or use a water heated carb spacer from a 60's Ford V-8. A Clifford manifold can be had already plumbed for water heat.
Last edited by Harte3; Feb 9, 2008 at 09:50 PM.
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From: Revelstoke B.C.
Originally Posted by Harte3
Your picture is showing the stock EFI manifolds and that is what works with the Walker Y pipe. Until I got through this whole thread it appeared you were talking about the Walker Y pipe with a stock log exhaust manifold...maybe your muffler guy thought that too.
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From: Lost
I see no reason a 2.5 pipe couldn't be used on the stock exhaust manifold. Some had 2.5", while others had 2.25".
I had new 2.25" pipe put under mine, with a flowmaster 40. They replaced everything from where the cat was, to the rear. I opted to not have the front section replaced, as I may upgrade to a 4bbl intake and EFI exhaust mani's. The shop told me they could use 2.5" just fine, but since it was 2.25" at the cat, I just went with that.
I had new 2.25" pipe put under mine, with a flowmaster 40. They replaced everything from where the cat was, to the rear. I opted to not have the front section replaced, as I may upgrade to a 4bbl intake and EFI exhaust mani's. The shop told me they could use 2.5" just fine, but since it was 2.25" at the cat, I just went with that.
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From: Revelstoke B.C.
I think there is an adapter on the manifold that has to be removed.Then I can go 2 1/2" all the way back.I will be going with the flow master 40 as well.There is a short one and a long version.I will be using the longer version,hopefully it will get a deeper sound.
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From: Maryland
I went with the EFI manifolds and walker dnpipe, highflow cat and walker dynomax cat-back system and still use the stock 1V intake; made a significant improvement in torque and useable RPM. Carb icing is an issue but running a stock air cleaner with heat tube from the manifold will help.
I think sticking with the stock exhaust manifold is selling yourself short, specially if you have done any engine mods. An engine is an air pump and you need to provide for flow. I gotta imagine adding a 4V (or even a 350CFM 2V) with manifold to my six would make it run awesome...
PS. The six in the pic is what you want to move your 3/4 ton!
I think sticking with the stock exhaust manifold is selling yourself short, specially if you have done any engine mods. An engine is an air pump and you need to provide for flow. I gotta imagine adding a 4V (or even a 350CFM 2V) with manifold to my six would make it run awesome...
PS. The six in the pic is what you want to move your 3/4 ton!
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From: Lost
Originally Posted by sedly
I think there is an adapter on the manifold that has to be removed.Then I can go 2 1/2" all the way back.I will be going with the flow master 40 as well.There is a short one and a long version.I will be using the longer version,hopefully it will get a deeper sound.
With the windows down, it has a nice, somewhat deep, mellow sounding tone, and is not overly loud. Again, it could easily be covered with a radio.
I have no idea what it sounds like as it drives past, as I am still teaching my son to drive, and haven't gotten to the point I trust him solo, even in a closed parking lot.....
I can say that I was execting it to be louder, but hoped it wouldn't. The FM 40 was given to me, after it spent about 3 months on a jeep 4.0L. He didn't like the drone it had inside, while running down the highway. I don't know how he could have heard anything over the howl of his tires......
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From: Northshore, MN
I have stock intake, efi exhaust with walker part number 45166 in my 79 bronco. I ran a single 2.5" exhaust through a Thrush turbo muffler, no egr, no cat. older YF carb, pre egr carb spacer, manual choke, 1986 air cleaner. No hotwater plate (yet) and it runs just fine at -20 F.
Oh, and a standard pipe cap from Menards to cover the hole on the walker downpipe.
Oh, and a standard pipe cap from Menards to cover the hole on the walker downpipe.
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From: Revelstoke B.C.
Originally Posted by havi
I have stock intake, efi exhaust with walker part number 45166 in my 79 bronco. I ran a single 2.5" exhaust through a Thrush turbo muffler, no egr, no cat. older YF carb, pre egr carb spacer, manual choke, 1986 air cleaner. No hotwater plate (yet) and it runs just fine at -20 F.
Oh, and a standard pipe cap from Menards to cover the hole on the walker downpipe.
Oh, and a standard pipe cap from Menards to cover the hole on the walker downpipe.
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From: Spokane, WA
No point in using a Walker 2x1 on a stock non-EFI manifold...it doesn't fit anyway. If the stock outlet won't accept a 2 1/2, that can be cured with a short 2 1/4 pipe expanded to 2 1/2 to weld to a 2 1/2 pipe back to the Cat or muffler or all the way out and it's a done deal.
The stock EFI manifolds do not attach to any Intake. The Walker Y pipe only attaches to the stock EFI manifolds. Your muffler guy's question is right on...I am wondering what is going on with the "gymnastics" here in trying to use a Walker Y pipe with a stock log, single outlet exhaust manifold.......
The stock EFI manifolds do not attach to any Intake. The Walker Y pipe only attaches to the stock EFI manifolds. Your muffler guy's question is right on...I am wondering what is going on with the "gymnastics" here in trying to use a Walker Y pipe with a stock log, single outlet exhaust manifold.......
Last edited by Harte3; Feb 10, 2008 at 02:58 PM.