|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
09-20-2011, 07:32 AM | #1 |
Member
Join Date: Jan 2011
Location: Central Jersey
Posts: 71
|
40 Ford Stock Exhaust Size???
My 40 Ford Sedan Delivery has a 41 engine rebuilt to 100 HP. The single exhaust pipe by today's standards looks ridiculously small. Checked it today and it measures 1.5 inches O.D. I'm wondering whether this restricted exhaust doesn't contribute to over-heating? Not that I would expect miracles... But just increasing this to 1.75" would result in 35% better flow even if you discount the reduction in back pressure.
I know that you more experienced flathead guys already have the answers to this and I sure would appreciate the help. |
09-21-2011, 04:10 PM | #2 |
Senior Member
Join Date: May 2010
Location: Alabama
Posts: 3,260
|
Re: 40 Ford Stock Exhaust Size???
My original 40 tail pipe measures 1.50 .
|
Sponsored Links (Register now to hide all advertisements) |
|
09-21-2011, 04:30 PM | #3 |
Senior Member
Join Date: May 2010
Location: Ashland KY
Posts: 1,159
|
Re: 40 Ford Stock Exhaust Size???
I have duel exhaust.. coming off headers is 1.75 intro 2 in muffler ,out of muffler with 2 in pipe, expand it a little to go over outlet of muffler, has to make all the brackets to get a good seal .
__________________
DON P |
09-21-2011, 09:56 PM | #4 |
Senior Member
Join Date: May 2010
Location: West Central Alberta
Posts: 441
|
Re: 40 Ford Stock Exhaust Size???
Some say 1 3/4" tailpipes make the best music of all. ..B.
|
09-22-2011, 05:12 PM | #5 |
Member
Join Date: Jan 2011
Location: Central Jersey
Posts: 71
|
Re: 40 Ford Stock Exhaust Size???
Thanks for the responses. I assume if I go larger, we're not talking stock and I'd have to have them made up?
|
09-22-2011, 07:59 PM | #6 |
Senior Member
Join Date: May 2010
Location: South Texas
Posts: 1,631
|
Re: 40 Ford Stock Exhaust Size???
Sponsored Links (Register now to hide all advertisements)
|
09-23-2011, 09:42 AM | #7 |
Member
Join Date: Jan 2011
Location: Central Jersey
Posts: 71
|
Re: 40 Ford Stock Exhaust Size???
Thanks for the responses. Considering that Ford used a 1.75" exhaust system just a decade later on smaller displacement engines... Just speculating that a reduction in exhaust back pressure might be helpful. We all know that flatheads have a tendency to run hot. Some are better than others. Some are worse. I can drive mine without too many problems as long as I don't have to stop and start too much in hot weather. But who can predict when you may get caught in traffic. Any incremental improvement to me seems worth considering.
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|