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EFV-8 Club Forum / General Ford Discussion / Dual Exhaust on my new 1940 ford coupe

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Posted By Discussion Topic: Dual Exhaust on my new 1940 ford coupe -- page: 1 2 3     Big Red 51 08-26-2021 @ 3:48 AM reply profile send p.m. New Member Posts: 194 Joined: Oct 2009 Classiclover If you want to show your classic at an Early Ford V8 Judging event and not loose points for duals, get a 1952 or 1953 V8, the first year duals are correct, when the 1953 was built for performing as an Indy Pace Car. The 1952 was then available also with correct duals. Don ford38v8 08-23-2021 @ 2:19 PM reply profile send p.m. Senior Posts: 2883 Joined: Oct 2009 I think the question is a no brainer. Of course any breathing restriction will cost some horsepower, which translates to poor gas mileage, however, a stock flathead with single exhaust and stock air cleaner breathes well enough that a conversion to dual exhaust with no other modifications likely will not provide any measurable benefit in gas mileage. A claim of gaining 2 miles per gallon with dual exhaust falls in the category of telling your wife you'll save money in the long run if you install duals. Alan kubes40 08-23-2021 @ 12:39 PM reply profile send p.m. Senior Posts: 3577 Joined: Oct 2009 My gosh ... a couple of you guys are making NO sense. Comparing a stock flathead to anything BUT a stock flathead of the same year and "build" is simply apples vs. oranges. Comparing the breathing requirements of a stock flathead to a race car is completely goofy for lack of a less offensive but accurate word. An engine, no matter what engine, can only utilize so much "breathing' capacity. 37ragtop and Steve... methinks you two guys should be, if you are not, very good friends. Mike "Kube" Kubarth 37RAGTOPMAN 08-23-2021 @ 10:12 AM reply profile send p.m. Senior Posts: 1992 Joined: Oct 2009 HI Guys I am with STEVE on this one, I have duals on my 37, and to me it has benefits, soumds cool, I have mufflers with 1 baffle,and headers. I believe my engine breathes better, if duals do not breathe better, why do race cars have open pipes,? if it had no benefits, they would have mufflers, it has alot to do with the intake manifold. the air cleaners restrict the amount of air entering the engine, if you use a stock air cleaner, you will see how it restricts the air flow, if you had 3 2s or 2'2s carb set up, more air would come in , so more exhaust would go out, and need bigger pipes, or 2 pipes to relieve the back pressure, better breathing engines go faster,and use less fuel, proven fact why was the HEMI CYLINDER HEADS developed ? not only for CHRYSLER, but many many car makers use this design on their engines,cross flow ARDUN did this for the FORD flatheads this is my 2 cents, 37RAGTOPMAN Drive your V8, its FUN, TomO 08-23-2021 @ 7:58 AM reply profile send p.m. Senior Posts: 7385 Joined: Oct 2009 Steve, your statement "Ford wasn't too concerned about mileage, because when I was 18 (1955) gas was 19.9 cents a gallon, and I made $40.00 a week!, so $3.00 would pretty much fill the tank, and last me a week!" is incorrect. If Ford and the public were not concerned about gas mileage post WWII, why were there so many "Economy Runs" and why did Ford brag about their results in advertising. As a single man, living with your parents, $3.00 was not a big hit on your pocket book. The family man making $40. a week had to pay rent, buy food for his family and save for retirement, $3.00 was ab big deal. Gas today is much cheaper than it was in 1940 in real terms. The average factory worker worked a 48 hour week for about $.55 per hour. Gas was about $.20 a gallon. Today the average factory worker makes around $25.00 an hour and gas is about $3.60 a gallon. People are still concerned about mileage. I also doubt that you got 2MPG more after installing duals. A well tuned engine is not that inefficient and standard mufflers do not give that much back pressure unless the muffler is plugged . Tom kubes40 08-23-2021 @ 7:04 AM reply profile send p.m. Senior Posts: 3577 Joined: Oct 2009 Steve, if you understand correctly? Nope, not this time either. Did I ever suggest restricting flow? I'm done. I should know better than to argue...never in the future will I make the same mistake. I concede Steve. You are correct again. I am incorrect. Mike "Kube" Kubarth This message was edited by kubes40 on 8-23-21 @ 7:06 AM Grant 08-23-2021 @ 5:30 AM reply profile send p.m. Senior Posts: 559 Joined: Oct 2009 Trying again to post the advertisement .......... Grant 08-23-2021 @ 5:14 AM reply profile send p.m. Senior Posts: 559 Joined: Oct 2009 Above and beyond the lovely sound of dual exhaust installed on an early Ford V8, there is also the added feature of attractive appearance at the rear of the vehicle with the use of accessory exhaust pipe tips below the bumper. Especially if you can locate a pair of cast aluminum XF-9 Jetstensions. Touring Class only, of course. According to an ad in the July 1953 issue of Motor Trend, their design employed "the best principles of aero-dynamics to add power and economy to your car". Would there have been an increase in horsepower? And gas mileage? Maybe. Or maybe not. But they do look nice. mfirth 08-23-2021 @ 4:56 AM reply profile send p.m. Member Posts: 209 Joined: Nov 2017 If, i remember correctly, Ford put dual exhaust on 8BA"Police Interceptor"engines. Wasn't there a cast iron left side manifold for that application? Thought I read that in "The V8 Times" some years back ???? Or maybe I'm just nutz......... sarahcecelia 08-23-2021 @ 3:43 AM reply profile send p.m. Senior Posts: 1196 Joined: Mar 2013 Kubes- So if I understand what you are saying : "any restriction of the flow of the exhaust would not decrease its breathing!" That's like saying-If you hold one nostril of your nose closed, it would not restrict you breathing! Come on friend - That's crazy! Regards, Steve Lee

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