• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

V8 Exhaust Question


markinms

Member
Supporting Member
U.S. Military - Veteran
V8 Engine Swap
TRS 20th Anniversary
Joined
Mar 28, 2017
Messages
180
Reaction score
17
Points
18
Location
MS
Vehicle Year
1987
Make / Model
Ford
Engine Type
V8
Engine Size
5.0L EFI
Transmission
Automatic
2WD / 4WD
4WD
Total Lift
4"
Tire Size
31 X 10.5 X 15
My credo
Duty, Honor, Country
I'm getting ready to install a set L&L headers on my 5.0L BII. Very well made and come with 2.5" collectors. Went to arrange exhaust system install with local muffler shop and the guy I spoke with "strongly" suggested I reduce from 2.5" to 2.25". My goal was to run 2.5" from the collector to a universal cat, to flowmaster muffer, and out to the back of the vehicle.

What do ya'll think? Does it make any sense to go to a smaller pipe?

Thanks for any feedback!

Mark
 


ericbphoto

Overlander in development
TRS Event Staff
TRS Forum Moderator
Supporting Member
U.S. Military - Veteran
TRS 20th Anniversary
VAGABOND
TRS Event Participant
GMRS Radio License
Joined
Feb 7, 2016
Messages
15,213
Reaction score
16,346
Points
113
Age
59
Location
Wellford, SC
Vehicle Year
1993
Make / Model
Ford Ranger
Engine Type
3.0 V6
Engine Size
3.0L
Transmission
Manual
2WD / 4WD
4WD
Total Lift
6"
Tire Size
35"
My credo
In theory, theory and practice are the same. In practice, they are different.
He probably knows more about exhaust than I do. I have read many times in recent years that with exhaust systems, bigger is not always better. Apparently, you need to keep it small enough to maintain good exhaust velocity for scavenging. That's most of what I've learned. A quick Google search brought up this page that applies some science to the issue. I'm sure others will chime in soon with more info and plenty of opinions. According to the article I referenced, I would guess that a stock 302 would be right on the edge between 2 1/4" and 2 1/2"
 

19Walt93

Well-Known Member
Ford Technician
V8 Engine Swap
Joined
Nov 13, 2018
Messages
4,475
Reaction score
4,412
Points
113
Location
Canaan,NH
Vehicle Year
1993
Make / Model
Ford Ranger
Engine Type
V8
Engine Size
351
Transmission
Automatic
2WD / 4WD
2WD
Total Drop
3"
Tire Size
235/55R16
My credo
If you don't have time to do it right will you have time to do it over?
I used a 2 1/2" single system on my 13.8 second, 302 Mustang and on my almost stock 351 Ranger with a Jones Max Flow muffler- it's like a Magnaflow for way less money. Dual 2 1/4" would be enough for a 6000-6500 rpm 302, velocity and torque would be higher with dual 2" for a more truck oriented engine.
 

RonD

Official TRS AI
TRS Technical Advisor
Joined
Jun 2, 2012
Messages
25,291
Reaction score
8,296
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Whats the collector outlet size?

As long as you are equal to or larger then doesn't matter

The size and length of the pipe from each cylinder and the size of the collector pipe decides the RPM band when you get scavenged power from the exhaust manifold/header design

As long as you don't go smaller after the collector it wouldn't matter, unless you are also looking to do "X" or "H" scavenging as well, then you would want to stay with collector size pipe
 

markinms

Member
Supporting Member
U.S. Military - Veteran
V8 Engine Swap
TRS 20th Anniversary
Joined
Mar 28, 2017
Messages
180
Reaction score
17
Points
18
Location
MS
Vehicle Year
1987
Make / Model
Ford
Engine Type
V8
Engine Size
5.0L EFI
Transmission
Automatic
2WD / 4WD
4WD
Total Lift
4"
Tire Size
31 X 10.5 X 15
My credo
Duty, Honor, Country
Thanks for the feedback! Collector size is 2.5 inch. I think I'll stick with my plans for a 2.5" exhaust system and override the muffler shop dude.

Also, thanks for tip about the less expensive muffler. I'll look into that.

Mark
 

ford4wd08

Well-Known Member
Supporting Member
Joined
Nov 12, 2018
Messages
1,249
Reaction score
510
Points
113
Location
Alcoa, TN
Engine Type
2.8 V6
Transmission
Automatic
2WD / 4WD
4WD
I would like to see pictures of this B2 5.0 swap.... I don't see many of them on the forum!
 

markinms

Member
Supporting Member
U.S. Military - Veteran
V8 Engine Swap
TRS 20th Anniversary
Joined
Mar 28, 2017
Messages
180
Reaction score
17
Points
18
Location
MS
Vehicle Year
1987
Make / Model
Ford
Engine Type
V8
Engine Size
5.0L EFI
Transmission
Automatic
2WD / 4WD
4WD
Total Lift
4"
Tire Size
31 X 10.5 X 15
My credo
Duty, Honor, Country
Here ya go, I kept a complete photo history of every task completed for the swap.

43069
 

ford4wd08

Well-Known Member
Supporting Member
Joined
Nov 12, 2018
Messages
1,249
Reaction score
510
Points
113
Location
Alcoa, TN
Engine Type
2.8 V6
Transmission
Automatic
2WD / 4WD
4WD
Here ya go, I kept a complete photo history of every task completed for the swap.

View attachment 43069
Looks awesome! I might start collecting part for a swap someday. Looks like you kept the AC box as well?

How did the AOD fit? What transfer case? Do you have a build thread?
 

19Walt93

Well-Known Member
Ford Technician
V8 Engine Swap
Joined
Nov 13, 2018
Messages
4,475
Reaction score
4,412
Points
113
Location
Canaan,NH
Vehicle Year
1993
Make / Model
Ford Ranger
Engine Type
V8
Engine Size
351
Transmission
Automatic
2WD / 4WD
2WD
Total Drop
3"
Tire Size
235/55R16
My credo
If you don't have time to do it right will you have time to do it over?
If you're talking about a 2 1/2" single system, I agree, a dual 2 1/2 will lower exhaust velocity and may hurt bottom end. It will likely be louder, too, and I'm not sure where you'd put a dual 2 1/2 system under a Bronco II, please don't run it out in front of the rear wheels.
My Ranger didn't have a heater box when I got it so I used a Vintage Air system, you're evap case really crowds things.
rf eng.JPG
 

85_Ranger4x4

Forum Staff Member
TRS Event Staff
TRS Forum Moderator
Article Contributor
V8 Engine Swap
OTOTM Winner
TRS Banner 2010-2011
TRS 20th Anniversary
VAGABOND
TRS Event Participant
Joined
Aug 7, 2007
Messages
32,206
Reaction score
17,520
Points
113
Location
SW Iowa
Vehicle Year
1985
Make / Model
Ford
Engine Type
V8
Engine Size
5.0
Transmission
Manual
I just have 2-1/4" duals on mine, I am happy with how it sounds.
 

Shran

Junk Collector
TRS Forum Moderator
Supporting Member
Article Contributor
V8 Engine Swap
Solid Axle Swap
Joined
Mar 4, 2008
Messages
8,637
Reaction score
4,704
Points
113
Location
Rapid City SD
Engine Type
V8
Engine Size
5.0
I have 2.5" single on mine, a Y pipe that goes into a single in/single out Flowmaster. Sounds good.

I suspect that there is a fabrication and/or muffler selection related reason why he said to go with 2.25".... maybe it has to do with where the inlet and outlet are placed on the muffler itself, I wanted a specific center in/center out muffler recently and it was only available in 2.25". I can't imagine that 1/4" makes any difference.

FWIW Roadkill/Engine Masters did a series of videos on exhaust size, X/Y/Y/etc crossovers, headers, and stuff a while back and I was was left with the impression that it doesn't matter as much as you'd think it would in most cases.
 

markinms

Member
Supporting Member
U.S. Military - Veteran
V8 Engine Swap
TRS 20th Anniversary
Joined
Mar 28, 2017
Messages
180
Reaction score
17
Points
18
Location
MS
Vehicle Year
1987
Make / Model
Ford
Engine Type
V8
Engine Size
5.0L EFI
Transmission
Automatic
2WD / 4WD
4WD
Total Lift
4"
Tire Size
31 X 10.5 X 15
My credo
Duty, Honor, Country
If you're talking about a 2 1/2" single system, I agree, a dual 2 1/2 will lower exhaust velocity and may hurt bottom end. It will likely be louder, too, and I'm not sure where you'd put a dual 2 1/2 system under a Bronco II, please don't run it out in front of the rear wheels.
My Ranger didn't have a heater box when I got it so I used a Vintage Air system, you're evap case really crowds things.View attachment 43071
Very nice!
 

markinms

Member
Supporting Member
U.S. Military - Veteran
V8 Engine Swap
TRS 20th Anniversary
Joined
Mar 28, 2017
Messages
180
Reaction score
17
Points
18
Location
MS
Vehicle Year
1987
Make / Model
Ford
Engine Type
V8
Engine Size
5.0L EFI
Transmission
Automatic
2WD / 4WD
4WD
Total Lift
4"
Tire Size
31 X 10.5 X 15
My credo
Duty, Honor, Country
The AOD fit fine, although a bit snug in there. I used the stock transfer case with an Advance Adapters AOD to BW1350 adapter. I never created a thread while I was doing this.
 

ford4wd08

Well-Known Member
Supporting Member
Joined
Nov 12, 2018
Messages
1,249
Reaction score
510
Points
113
Location
Alcoa, TN
Engine Type
2.8 V6
Transmission
Automatic
2WD / 4WD
4WD
The AOD fit fine, although a bit snug in there. I used the stock transfer case with an Advance Adapters AOD to BW1350 adapter. I never created a thread while I was doing this.
It is never too late. Would love to see a thread!
 

19Walt93

Well-Known Member
Ford Technician
V8 Engine Swap
Joined
Nov 13, 2018
Messages
4,475
Reaction score
4,412
Points
113
Location
Canaan,NH
Vehicle Year
1993
Make / Model
Ford Ranger
Engine Type
V8
Engine Size
351
Transmission
Automatic
2WD / 4WD
2WD
Total Drop
3"
Tire Size
235/55R16
My credo
If you don't have time to do it right will you have time to do it over?
The AOD fit fine, although a bit snug in there. I used the stock transfer case with an Advance Adapters AOD to BW1350 adapter. I never created a thread while I was doing this.
I used a C4 because I had one that I had driven and knew it would be an easy rebuild. I've never built anything with an automatic transmission and didn't know if I'd be able to stand it, if I decide to swap in a T5 I should be able to sell the C4 for a small profit.
 

Sponsored Ad


Sponsored Ad

Staff online

Member & Vendor Upgrades

For a small yearly donation, you can support this forum and receive a 'Supporting Member' banner, or become a 'Supporting Vendor' and promote your products here. Click the banner to find out how.

Truck of The Month


Kirby N.
March Truck of The Month

Recently Featured

Want to see your truck here? Share your photos and details in the forum.

Follow TRS On Instagram

TRS Events

25th Anniversary Sponsors

Check Out The TRS Store


Sponsored Ad


Sponsored Ad

Sponsored Ad


Amazon Deals

Top