|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
04-21-2020, 01:22 PM | #1 |
Senior Member
Join Date: May 2010
Location: Suttons Bay, Mich.
Posts: 3,384
|
Exhaust diameter
I ordered some u bends for my Flathead to make my own exhaust during this at home quarantine. My ‘36 engine is stock but I have a set of red’s headers. I ordered 1.75 u bends but I was shipped 1 5/8 instead. Would this make a huge difference? I was planning on no mufflers, just wondering what the smaller diameter pipe is going to do as far as sound?
__________________
Respecting and Resurrecting Ford Model A's. |
04-21-2020, 01:36 PM | #2 |
Senior Member
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,260
|
Re: Exhaust diameter
About 25 years ago, I spent a lot of time and effort putting a 2" system all the way back on a '36 I had. (The car had a set of Fenton headers). Later, I found out that not only did it not help anything, and produced a "hollow" sound that was inferior too that which smaller pipes produced. I have heard that 1 1/2" pipes are just about right for dual "straight pipes" on a flathead.
And let's face it; modified exhaust on a flathead is more about "The Sound" than performance. |
Sponsored Links (Register now to hide all advertisements) |
|
04-21-2020, 03:08 PM | #3 |
Senior Member
Join Date: May 2010
Location: Suttons Bay, Mich.
Posts: 3,384
|
Re: Exhaust diameter
Yeah I am not going on performance. It will still feel powerful to me since it is in my ‘29 coupe that used to have only 40 hp. I just want the sound to be right.
__________________
Respecting and Resurrecting Ford Model A's. |
04-21-2020, 03:24 PM | #4 | |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
|
Re: Exhaust diameter
Quote:
|
|
04-21-2020, 03:52 PM | #5 |
Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 10,879
|
Re: Exhaust diameter
1 5/8 will work just fine. I think the stock 40 exhaust pipe is 1 5/8".
|
04-21-2020, 04:00 PM | #6 |
Senior Member
Join Date: Oct 2015
Location: Bonita, CA
Posts: 1,374
|
Re: Exhaust diameter
Sponsored Links (Register now to hide all advertisements)
|
04-21-2020, 04:42 PM | #7 |
Senior Member
Join Date: Aug 2010
Location: New Zealand
Posts: 1,110
|
Re: Exhaust diameter
https://www.google.co.nz/url?sa=t&rc...PnDFsEn3muWED4
While not relevant to total exhaust length and diameter , it may give you a good laugh as to how smashed headers affect flow. |
04-21-2020, 07:11 PM | #8 |
Senior Member
Join Date: May 2010
Location: Suttons Bay, Mich.
Posts: 3,384
|
Re: Exhaust diameter
I am going to run with it and fab up my pipes. If it isn’t what I like I am only out $60 so I could always change it.
__________________
Respecting and Resurrecting Ford Model A's. |
04-21-2020, 07:12 PM | #9 |
Senior Member
Join Date: May 2010
Location: Suttons Bay, Mich.
Posts: 3,384
|
Re: Exhaust diameter
Also has anybody ran an equalizer tube? I hear that it is not needed on flatheads which I understand but I wonder how one would effect the sound?
__________________
Respecting and Resurrecting Ford Model A's. |
04-21-2020, 07:15 PM | #10 |
Senior Member
Join Date: May 2010
Location: Kitchener, Ontario
Posts: 172
|
Re: Exhaust diameter
|
04-21-2020, 07:16 PM | #11 |
Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 10,879
|
Re: Exhaust diameter
I would think that duals on a flatty add little to performance unless you are running a full out racing engine. That "smashed header: video tells the same story - no difference.
|
04-21-2020, 07:40 PM | #12 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
|
Re: Exhaust diameter
|
04-22-2020, 12:24 PM | #13 |
Senior Member
Join Date: Jan 2011
Posts: 162
|
Re: Exhaust diameter
I have little different experience. I have full length 1 3/4 exhaust with long Smittys.
There was annoying rapp when accelerating , I thought that it was because of plugged heat risers and unplugged them , same rapp. I made small (app 1") equalizer tube and app was gone and nice flathead sound is there all the time. Maybe I was just lucky... |
04-22-2020, 12:31 PM | #14 | |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
|
Re: Exhaust diameter
Quote:
|
|
04-22-2020, 01:21 PM | #15 |
Senior Member
Join Date: May 2013
Location: Wellington, Kansas
Posts: 444
|
Re: Exhaust diameter
A '47 car came with 1 3/4" diameter exhaust, correct?
|
04-22-2020, 03:27 PM | #16 |
Senior Member
Join Date: Jan 2012
Location: Lyman,ME.
Posts: 2,612
|
Re: Exhaust diameter
Not trying to hijack the thread.....I just bought a set of Brockmans and could only get 2” inlet-outlet.....I had also planned on using 13/4 “ pipes......I have manifolds for duals .....is there an issue with bushing down on the inlet-outlet?......thanks.....Mark
__________________
I'm thinkin' about crankin' My ragged ol' truck up and haulin' myself into town. Billy Joe Shaver |
04-22-2020, 05:19 PM | #17 | |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
|
Re: Exhaust diameter
Quote:
|
|
04-22-2020, 05:39 PM | #18 |
Senior Member
Join Date: Jan 2012
Location: Lyman,ME.
Posts: 2,612
|
Re: Exhaust diameter
Ok....Thanks!.....Mark
__________________
I'm thinkin' about crankin' My ragged ol' truck up and haulin' myself into town. Billy Joe Shaver |
04-22-2020, 08:59 PM | #19 | |
Senior Member
Join Date: May 2010
Location: Suttons Bay, Mich.
Posts: 3,384
|
Re: Exhaust diameter
Quote:
__________________
Respecting and Resurrecting Ford Model A's. |
|
04-23-2020, 01:00 AM | #20 |
Senior Member
Join Date: Jan 2012
Location: Lyman,ME.
Posts: 2,612
|
Re: Exhaust diameter
That’s the only “rap” I can stand listening to.... Mark
__________________
I'm thinkin' about crankin' My ragged ol' truck up and haulin' myself into town. Billy Joe Shaver |
Thread Tools | |
Display Modes | |
|
|
Sponsored Links (Register now to hide all advertisements) |
|