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Author
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Topic: Is bigger better!
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MR.73STANG
Journeyman Posts: 49
From: C.A. MODESTO
Registered: Dec 2004
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posted 01-07-2005 05:26 PM
   
Should I go with a 2 1/2 inch exhaust or a 3 inch? My hooker headers are 3 inch at the collector. Or does it really matter. MoneyMaker what kind of exhaust do u run?
Thanks for the info  Everybody Have a good weekend 
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N266fords
Gearhead Posts: 1652
From: Sierra Vista ,Az USA
Registered: Apr 2003
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posted 01-07-2005 05:37 PM
I dont know what motor or specs but if its a mild motor under 350 hp go with 2.5,
Keep the velocity up and temp of the gasses
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steve'66
Gearhead Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 01-07-2005 05:42 PM
MoneyMaker does run an exhaust. I vote for the closest thing to no exhaust, which means bigger is better. For racing anyway,  SteveW
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N266fords
Gearhead Posts: 1652
From: Sierra Vista ,Az USA
Registered: Apr 2003
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posted 01-07-2005 06:16 PM
Yes but there are a lot of factors X-pipe, mufflers, mandrel bends, lenght of pipes amount of turns, how much radius each turn has ect..
Compression ratio, gears, rpms, ect. All of these make the exaust work and to what are you trying to achieve, sound, performance, street,ect...
Bruce
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Ryan Wilke
Gearhead Posts: 2289
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 01-07-2005 06:24 PM
Glad to hear you got the headers - you'll like them!!  For your warmed-over 351W/FMX setup, 2.5" pipes all the way out would be just fine. As Bruce mentioned, try to locate a muffler shop that'll bend your exhaust pipes with a MANDREL rather than a 'pipe crusher unit'. The smoother the bends, the better the flow. An X or H-pipe about 15-20" out from the collectors, then a pair of DynoMax Turbos would finish off the system! Ryan P.S.
Then comes the traction-loc differential, 3.89 rear gears, Holley carb, etc.... the fun never ends!!
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Dubz
Gearhead Posts: 1890
From: Manitoba Canada
Registered: Oct 2002
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posted 01-07-2005 07:24 PM
I persoanlly would go with 3" to a 3" x-pipe, then after the x-pipe reduced to 2.5" the rest of the way. Some good reducers like the flowmaster ones that are gradual are the key wherever you put them.
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stroker man
Gearhead Posts: 332
From: Denville NJ USA
Registered: Mar 2002
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posted 01-07-2005 07:35 PM
thats what i have 3'' x-pipe into 2.50 2chamber flows into 2.50 ex.
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johnny 4-speed
Gearhead Posts: 172
From: Larkspur, Ca. USA
Registered: Oct 2004
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posted 01-07-2005 08:32 PM
Mr.Stang, sir. I run 3" collectors on my 351-headed 289. They are then sharply reduced to 2 1/2" with H-pipe, 3 chamber Flows, then turn outs ahead of the rear wheels.
I gained 5 MPH when I ran without the exhaust! With that in mind, I r'mend the biggins'! JD------------------
Never fry bacon naked!
------------
65 Fairlane
289ci
Top loader
9-inch w./5.13's & locker
27"x10.5 cheaters [This message has been edited by johnny 4-speed (edited 01-07-2005).]
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steve'66
Gearhead Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 01-07-2005 08:39 PM
My/our '66 gains 3-4 mph and looses .2 seconds in the 1/4 with open headers. Versus 3" exhaust to 3" single chamber flows that exit in front of the rear end. Say all you want about x pipes and stuff, open headers work best on the strip. Now Mr73's is a daily driver and open headers aren't an option. But I still think bigger is better. SteveW
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MR.73STANG
Journeyman Posts: 49
From: C.A. MODESTO
Registered: Dec 2004
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posted 01-07-2005 08:59 PM
Steve'66 I was thinking about runing 3" piping to my 2 chamber flows with a 3" turndown. What do you think? Do i really need a x-pipe, or h-pipe?
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Dad Vishus
Gearhead Posts: 920
From: Moscow, Iowa, USA
Registered: Dec 2001
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posted 01-07-2005 09:40 PM
Every time I have changed a factory exhaust system, its been to improve mileage and performance. I bought a new 77 Econoline with a 351W 2 barrel. It was a slug and got terrible mileage. I put a set of $79 headers on it, Thorley I think, and 2 - 2.5 inch full length pipes with fairly quiet aftermarket mufflers. I immediately picked up 3 MPG. The E350 we towed with before the Powerstroke came along was a real healthy 460. I put cheapo type headers on it, 2.5 inch primaries into a Flowmaster 2 - 2.5 inch into 1 - 3 inch y-connector. That is a real nice piece, BTW. From that into a Dynomax 3 inch RV muffler and a 3 inch tail pipe. It was quiet, and efficient. We did the same set-up on my Dads C class motorhome it worked so well. I guess my point here is, bigger is better. Those 2 chamber Flowmasters are LOUD, obnoxiously loud, so be prepared for that. On an every day driver, they will get on your nerves. With just turndowns, all that noise is where you will hear it the most. It might be neat for a while, but......  Anyway, I've had good luck going with the biggest possible pipe sizes. Theres no substitute for free flow! ------------------
63 Falcon 377 Cleveland stroker Flying Toilet alchohol injection. 6.19 @ 110 MPH 1/8 mile
2002 Ranger FX4 daily driver
2000 F350 PSD Crew cab dually - Like commuting in a B52!!
98 US Cargo Phantom II 28'
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steve'66
Gearhead Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 01-07-2005 10:35 PM
quote:
Originally posted by MR.73STANG:
Steve'66 I was thinking about runing 3" piping to my 2 chamber flows with a 3" turndown. What do you think? Do i really need a x-pipe, or h-pipe?
I would run 3" 'til the tail pipes, (if you want tail pipes) then Flowmaster's 2 1/2" mandrel bent tailpipes out the back. The muffler choice is yours. It's probably overkill for a warmed over 351w, but you may grow into it. Also, I don't beleive in X or H pipes. I could be wrong on them, but they are not open headers. LOL SteveW
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N266fords
Gearhead Posts: 1652
From: Sierra Vista ,Az USA
Registered: Apr 2003
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posted 01-07-2005 10:43 PM
Steve I can still unbolt my X-pipe to have open headers at the track.. For the street they scavenge very well.
Bruce Williams
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steve'66
Gearhead Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 01-07-2005 11:20 PM
Bruce,I don't disagree with you. We have to run muff's at the track on Wednesday nights. So we leave the exhaust on even when we don't have too for consistency. They are just 44" long and don't get in the way of anything. X and H pipes are in the way of the tranny, etc. They may help mid range, but I wasn't commenting about sreetability. With a 4500 stall converter we wouldn't notice mid range torque or responsiveness anyway. For a driver and a warmed over 351w with a FMX, your sugesstion is a great one. But, if he wants to kick it up in future.... SteveW
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