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For a Flathead exhaust what...

Discussion in 'The Hokey Ass Message Board' started by HD74, Apr 4, 2010.

  1. HD74
    Joined: Jan 24, 2009
    Posts: 303

    HD74
    Member

    For a Flathead exhaust what would you lose in performance and sound if you used 2.0 vs. 1.75 pipe?

    A little back ground on the motor; 284 cu., triple 97's, Red's headers going in a 51 F-1.

    Your opinion please.
     
  2. V8 Bob
    Joined: Feb 6, 2007
    Posts: 2,819

    V8 Bob
    ALLIANCE MEMBER

    I would run 2" with a large flathead, as I do with the 286" in my '32. As for sound, it really depends more on the muffler length and style you use and the health of the engine rather than pipe size. IMO.
    Bob
     
  3. 1 7/8" is what they would have used for a hot setup back in the day. Not a lot of guys have 1 7/8" dies or know where to get pipe for that size so they go with 2"
    larger pipe more deep a sound you will get, smaller pipe more pop and rap. You will get more backpressure for sure with smaller pipe, but I doubt you will notice the difference unless your talking HUGE horsepower.
    Run some Porter mufflers, you will be VERY happy with them. They are the best out there for the money. Don't cheap out on Smitty's.
    Toss the Red's in the trash and get some cast Fentons, Reds are cheap, thin and unless you weld a flange on the ends, they will leak. I can make better headers in a half hour with my Huth bender and a pair of flanges.
     
  4. V8 Bob
    Joined: Feb 6, 2007
    Posts: 2,819

    V8 Bob
    ALLIANCE MEMBER

    Cliffy,
    I agree with your statement on 1 7/8" exhaust pipe, and the choice of mufflers other than Smithy's. I use and recommend Brockman's because they are a great local (Indiana) company to deal with and produce a high quality muffler. I've never seen or heard Porter's, but from what I know, they are also a quality muffler.
    I disagree, however, with you on two points. One, Fentons do not fit ALL flathead car and truck chassis. Two, Red's headers have been made for decades, are of high quality, and are available in many designs to properly fit every flathead car and truck. To make a statement that you can build a better header in a half an hour might be true, and IF it is, then START making them, but don't "trash" someone and his business who's been at it for a very long time, along with the many other services Red's has, and does, provide. IMO
    Bob
     
    Last edited: Apr 4, 2010

  5. HD74
    Joined: Jan 24, 2009
    Posts: 303

    HD74
    Member

    I like my Red's headers and Jim their is a stand-up guy. [​IMG]
    [​IMG]
     
    Last edited: Apr 4, 2010
  6. bobscogin
    Joined: Feb 8, 2007
    Posts: 1,761

    bobscogin
    Member

    Half hour, as in 30 minutes? Uh, sure. Did I tell you about the time I hammered out a set of perfect Deuce front fenders between breakfast and lunch? :D

    Bob
     
  7. Teep
    Joined: Jul 2, 2008
    Posts: 113

    Teep
    BANNED
    from Travis AFB

    i had 1 3/4 on my stock flatty and that backpressure worked very well with the engine, but with 286, i would definitely go with 2 inch
     
  8. littlechris
    Joined: Jan 17, 2006
    Posts: 197

    littlechris
    Member
    from MILWAUKEE

    2 Inch is working great for my 59-ab
     
  9. Diavolo
    Joined: Apr 1, 2009
    Posts: 822

    Diavolo
    Member

    I was crunching numbers, trying to figure out volumetric efficiency if I was to make a set of headers from scratch. I don't know the practical application or how efficient it would be at scavenging but I calculated 2 1/2 collector if I used 1 1/2 inch outer tubes and 1 5/8 inch inner tube. I'm thinking of making a set of headers in a ram horn shape and was just playing with numbers to see if I could get a realistic 0 backpressure.

    This size assumes 100% flow from all tubes. I think it's overkill, but based on those tube sizes I don't think I will err on the side of being too restrictive. If/when I do this, I will make a tech-o-matic on it.
     
  10. HD74
    Joined: Jan 24, 2009
    Posts: 303

    HD74
    Member

    I checked out the Porter Muffler web page. You have to check out the 51" Ford pick-up on their youtube page. I don't have any idea what engine is in that truck but, it sounds amazing.
     
  11. HD74
    Joined: Jan 24, 2009
    Posts: 303

    HD74
    Member

    Just a bump so I can get more info.
     
  12. MBog
    Joined: May 2, 2006
    Posts: 553

    MBog
    Member

    Mine had dual 2 1/2s with glass pack cherry bombs, The power was way down and droaned like hell. I switched to 2" with hushpowers (which are a glass packed oval), love the sound and no droan...
     
  13. mtflat
    Joined: Jan 28, 2003
    Posts: 422

    mtflat
    Member

    I told you what I've got on the truck board, but here's more detail on my experiences fwiw.

    I run Red's nickel plated headers on my 48 F1. They've been there 10 years now and not a single problem on that daily driver. They fit around the steering gearbox perfectly - no problems with excess heat.

    From everything I've read, cast Fentons will require custom fitting (grinding) - they weren't made for trucks and the gearbox is in the way.

    I run Smitty's but won't next time. I'm on my second pair - ends broke out of the first and current set have rusted out to the point I'm pretty much using straight pipes. Which is what I plan to do for the next go-round. If I decide to run mufflers I'll try Brockman's.
     
  14. HD74
    Joined: Jan 24, 2009
    Posts: 303

    HD74
    Member

    Alright, have all the info I need to make up my mind. So I'm going with Porter Mufflers and 2 inch pipe. I'll post a before and after piece.
     
  15. Porter Man
    Joined: Oct 14, 2007
    Posts: 377

    Porter Man
    Alliance Vendor
    from Mound, MN

    The Merc Truck is a SBF with a 302 in it.

    FYI - Jim Davis at Red's Headers & Speed Equipment is a great guy! They are our newest Dealer, sending out muffs to them tomorrow.
     
  16. drifters cc
    Joined: Feb 16, 2010
    Posts: 178

    drifters cc
    Member

    Nobody has mentioned a real important factor here. Exaust valve size! You can run any size tube you want, but your valve (and very restrictive exaust runners) will be the limiting factor. Think about.
    I've also done the calucations for primary tube and collector size and came up with 1.500 to 1.625 ID primary and 2.500 collector dia.
    Diavol is dead on. sq rt of pi r sqd * 3
     

  17. They are three tubes with little to no issues with clearance and hardly any bends, it isn't rocket science. Red's don't even have flanges on the end, you have to weld your own or expand them to fit your front pipes. Maybe a half hour is a little cocky....35 minutes.

    Jim may be a good guy, I never said he wasn't. He has a great, simple product. His product fits the market he is selling them for...lower dollar headers that look good. The statement that they are "high quality"?!? They are a pair of flanges with $5 worth of compression bent pipe welded to them. You can put a pipe over the end and bend them to clear without any effort, the tube is certainly not the best quality you can get. 20 gauge I am guessing, I don't think it is 16 gauge. I prefer 14 gauge tube. Maybe I have not used his best stuff, I am just going by what I have installed for customers in the last couple years. I have put on three pairs of his headers in the last two years and each needed work to fit exhaust to them. Two pairs were dinged on the exit end, right out of the box. One pair had a flange that didn't line up with the bolt holes and I had to grind the flange to get them to bolt on. One pair hit the steering box. I do really like the physical looks of them however and the powdercoated pair I used was decent.
    I am not saying that they are horrible, because they are not, I am saying that I prefer cast headers or I will make my own before I would buy Red's. I own my own bender, so it is a lot easier for me to make headers. For the normal guy, Red's serve the purpose just fine. I can't give my 2 cents just because the guy who makes them is a nice guy?
     
  18. Never heard of Porters????only been makin them since the early 50s..I had em in 1951
     
  19. R Pope
    Joined: Jan 23, 2006
    Posts: 3,309

    R Pope
    Member

    He said he never heard Porter's, not that he'd never heard of them.
     
  20. HD74
    Joined: Jan 24, 2009
    Posts: 303

    HD74
    Member

    Not the best picture angles of the exhaust system. but if I ever get it back on a lift I'll take more. Right now I'm trying to make-up my mind wither to ceramic coat or not.
    Some details, everyone likes details. LOL. From the collector flange to the tips 2 inch pipe with a custom crossover and Porter mufflers.
    [​IMG]
    [​IMG]
    [​IMG]
     
  21. Doctor Detroit
    Joined: Aug 12, 2010
    Posts: 1,028

    Doctor Detroit
    Member

    I've seen the universal do-it-yourself exhaust kits from Speedway Motors or on ebay, but I've only found 2.25" or larger. Does anyone know of an exhaust kit made of 1 7/8" or 2" tubing?
     
  22. railroad
    Joined: Feb 3, 2010
    Posts: 242

    railroad
    Member

    1.75" will allow 217 hp and 2.00" is good for 289 hp. Duals of course.
    Chart is in Oct issue of Popular Hot Rodding.
     
  23. flatmotor40
    Joined: Apr 14, 2010
    Posts: 581

    flatmotor40
    Member
    from georgia

    I used a set of Tatom full tube headers on my 40 with flathead and Smitty
     
  24. kendall66
    Joined: Apr 3, 2011
    Posts: 96

    kendall66
    Member
    from iowa

    i need new exhaust on my 49 F-1, have a 1952 flathead with EAB heads and center drop headers and will be 2.5 pipe, the engine has a 4" stroked mercury crank mild cam 2x2 carb. setup. question is............has anyone used thrush cherry bomb glass packs? ....input anyone on the thrush glass pack?
     
  25. HD74
    Joined: Jan 24, 2009
    Posts: 303

    HD74
    Member

    You get what you pay for, that's why I went with Porters.
     
  26. tommy
    Joined: Mar 3, 2001
    Posts: 14,757

    tommy
    Member Emeritus

    A flathead with the right exhaust system components has a sound all it's own. I started doing exhaust in the late 70s and I could never get that sound that I remembered from the 50s-60s. I always used 2" for the performance idea. Finally a Customer came in with a 51 Merc coupe and he insisted that I use 1 3/4" tail pipes exactly like he had as a kid. I did not stock 1 3/4" but I got some and did it his way. WOW! was I surprised to get that classic flathead sound again. I had 2" on my Sport Coupe. I changed it over to 1 3/4" and it made it a new car.

    If you don't care about the classic sound then the 2" is fine but a Flatty needs 1 3/4" tail pipes. It's even more critical than the mufflers that you choose. IMHO
     
  27. Doctor Detroit
    Joined: Aug 12, 2010
    Posts: 1,028

    Doctor Detroit
    Member

    Anybody else have 1.75" or 2" exhaust on their flathead? I'm almost ready to fabricate the exhaust and I wouldn't mind hearing from other guys who have those sizes. I have a what I think is a stock 8BA going into a 51 Mercury.
     
  28. I fabbed up a manderl bent 2" system on 289 inch 8BA but it is blown. I run the ported centre dump Belond style headers with a 2.5" collector.

    I love the way it sounds, esp at WOT.

    Rat
     
  29. Fenton header's through 1 3/4 inch exhaust with some 18" Brockman's reversed sound real nice!
     
  30. roder1935
    Joined: Nov 30, 2010
    Posts: 89

    roder1935
    Member

    I run smittys and reds headers love em both but I'm cheap
     

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