Exhaust size......
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Junior User
Joined: Sep 2000
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From: Sonora
Exhaust size......
Got a question for y'all. I just had all new exhaust/tailpipes put on my truck. I supplied the mufflers, and through a friend's friend, got a pretty fair price for the whole operation, about $200 with chrome tips. The stock size pipe was 2.25" The mufflers I bought are 2.5" in/out. After I got home and really looked at it, I see that the guy used 2.25" pipe and adapters. Now we never specifically agreed on a size, but I figured he would use the same size pipe as the muffler. My question is this. Will this make a big difference in performance, and if so, should I go back and complain? I plan to get headers soon, and might even drop a 390 in it, and I don't want to end up WISHING I'd straightened this out. I feel kinda bad since my friend got me a deal, but I don't know if it was an honest mistake, or if the guy was trying to screw me. What do y'all think?
Bill
'70 F-250 Camper Special 360/C-6, 3.73, 8 mpg uphill or down
Bill'70 F-250 Camper Special 360/C-6, 3.73, 8 mpg uphill or down
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From: Virginia
Exhaust size......
You will have guys tell you that nothing will work but 3". They are crazy. 2 1/4 is plenty, and really, you have a good thing going there. There is very little restriction in the pipe itself, all the restriction is in the muffler and you have oversized mufflers installed, so I think this would work good in my opinion.
Lead Driver
Joined: Apr 2001
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From: Texas
Exhaust size......
I saw a chart that suggested 2.5" dual pipes for 350-400 cubic inch engines. But that was for modified engines. Your probably OK with the 360 and it might actually help keep some of the low end torque that you need in a truck. I wouldn't worry about it unless you've bolted on some high flow goodies like intake, carb, heads or headers. Consider , the truck came original with single 2.25" plumbing, right?
Greg
Greg
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From: Creedmoor, North Carolina
Exhaust size......
Bill If the job looks good and you are happy with it, FORGET ABOUTIT. You can have the pipes removed and take it somewhere else and pay them $400.00 to put a system in. Maybe you just bought mufflers with the wrong size inlets. :-)
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From: All over Texas
Exhaust size......
I'd be willing to bet if a little gremlin came and replaced your 2.25" pipes in the middle of the night with 2.5" pipes, you wouldn't even realize a difference in the morning when you first drove it.
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From: Sonora
Exhaust size......
I think you're right, that I may not notice a difference, but it is the principle of the thing. I don't like to think that someone is getting over on me. I have installed Ed. Performer intake & carb and will be putting in a cam soon if I don't go to a 390. My engine runs so strong that I can't find an excuse to move up. I'm wondering if the guy before me that rebuilt the engine didn't go to a bigger cam, cause for a 360, it's got b@%%$. Anyway, I guess as long as it won't hurt my performance, I guess I'll let it go. By the way, what do you guys think of H-pipes? Are they worth it? Bill
'70 F-250 Camper Special 360/C-6, 3.73, 8 mpg uphill or down
'70 F-250 Camper Special 360/C-6, 3.73, 8 mpg uphill or down
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From: All over Texas
Exhaust size......
I don't know how you've got your exhaust run, but on my '68 CS I had to put both pipes down the right side of the truck due to the aux fuel tank being on the left. Hence, I don't have any place for an "H" pipe, although I've always been a big fan of the concept.
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From: yes
Exhaust size......
dual 2 1/4 is probably good for 275 horse, depending on the mufflers, I got my muffler shop to run dual 3" for less than $150 with me supplying the mufflers, they said they used over 18' of 3" pipe (I already had the first 4 feet installed myself just to have it somewhat legal), they have and will keep my business. I've heard before that you should size the pipe according to the horsepower, I dont know how well I agree with it but it kinda makes sense, 250horse, have the flow of a 2 1/2" pipe, 300horse, have the flow of a 3" pipe
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From: Inthepast
Exhaust size......
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Bill:
I agree with the other comments about the lack of any appreciable performance difference. I also wanted to comment on the "friend" of a "friend" thing. First, I bet there isn't a significant price differential between the two sizes. So I doubt this guy was consciously trying to cheat you. The other point I make is that in the future you have to make sure you are talking apples and apples when you negotiate a price on something. The last point is that when you have "friends" do you favors like this you end up looking like a smuck if you say something about the way it was done (or not done). This is one of the reasons I like to either do things myself or pay the going rate. At least when you pay the going rate you never feel ashamed to speak up to make sure the job is being done correctly.
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Bill:
I agree with the other comments about the lack of any appreciable performance difference. I also wanted to comment on the "friend" of a "friend" thing. First, I bet there isn't a significant price differential between the two sizes. So I doubt this guy was consciously trying to cheat you. The other point I make is that in the future you have to make sure you are talking apples and apples when you negotiate a price on something. The last point is that when you have "friends" do you favors like this you end up looking like a smuck if you say something about the way it was done (or not done). This is one of the reasons I like to either do things myself or pay the going rate. At least when you pay the going rate you never feel ashamed to speak up to make sure the job is being done correctly.
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Exhaust size......
Amen, stockman. Good point on the value of a job well done. As a consumer, and a repair shop operator,Value is always first and foremost in my eyes regardless of which side of the counter I am standing on.
Elder User
Joined: Aug 2001
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From: Collierville, TN
Exhaust size......
I'd be interested in hearing more opinions about using H pipes. I've heard from some that they are absolutely necessary, and from others that they help for high-RPM power but hurt low-end torque. Since I'm building a low-revving tow motor, should I keep the duals separate or link them with an H pipe?
karlsd a/k/a "ksd"
69 F100 Explorer 360/C6
karlsd a/k/a "ksd"
69 F100 Explorer 360/C6
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From: Greenville USA
Exhaust size......
I just got a bought a set of Dynomax Hemi Super Turbo Mufflers with 2 1/2" inlets/outlets and had a local shop fab up a custom dual exhaust with 2 1/2" pipe for my 78. Cost was $240 including hangers, collecter adaptors, mufflers, and pipe. I don't think there was much difference from the previous system which exited in front of the wheels. It now exits behind the wheels. The main difference is a drastic decrease in sound levels in and around the truck.
fordmando
70 F-100 Ranger XLT 400 C6
78 F-150 4x4 400 4 on floor
George
fordmando
70 F-100 Ranger XLT 400 C6
78 F-150 4x4 400 4 on floor
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Exhaust size......
It's another opinion so take it for whats it's worth..
2", 2 1/4", 2 1/2" IMHO really doesn't make alot of diff.
My truck 71F250 390-4v has the Edel. crb and mainfold, cheap headers, 2 1/4" pipe with cheap turbo mufflers. No H pipe.
The engine is grunty, lumpy and kinda loud. I used to have 2" pipe and factory exh. manifolds. When I yanked the iron logs and put in headers I gained 20 hp, much better throttle response and 1.5 mpg average increase. ( I can say 20 hp because I ran it on a wheel dyno.) Manifold to header conversion will give you the best returns. H pipes are great for high end, high rev engine
These old machines just don't see above 3000 very often at all.
Speaking on the high end, I have a 66 LTD w/ a 428SCJ. I have built this motor to the max and I do run 5000+ in it
It has headers, Hooker S.Comp, 2.5" pipe and Flowmtsr 3 chambers
I could have run 3 " pipe but the performance gain was VERY minimal and bending it around stuff would have been very difficult.
2 cents
DV
2", 2 1/4", 2 1/2" IMHO really doesn't make alot of diff.
My truck 71F250 390-4v has the Edel. crb and mainfold, cheap headers, 2 1/4" pipe with cheap turbo mufflers. No H pipe.
The engine is grunty, lumpy and kinda loud. I used to have 2" pipe and factory exh. manifolds. When I yanked the iron logs and put in headers I gained 20 hp, much better throttle response and 1.5 mpg average increase. ( I can say 20 hp because I ran it on a wheel dyno.) Manifold to header conversion will give you the best returns. H pipes are great for high end, high rev engine
These old machines just don't see above 3000 very often at all.
Speaking on the high end, I have a 66 LTD w/ a 428SCJ. I have built this motor to the max and I do run 5000+ in it
It has headers, Hooker S.Comp, 2.5" pipe and Flowmtsr 3 chambers
I could have run 3 " pipe but the performance gain was VERY minimal and bending it around stuff would have been very difficult.
2 cents
DV
