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Author
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Topic: H pipe size?
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Dubz
Gearhead Posts: 1849
From: Manitoba Canada
Registered: Oct 2002
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posted 08-19-2005 05:32 PM
   
Got my set of headers today from the wonderful DutchD58 that posts on here ocasionally. He sent them free of charge which is one heck of a deal, and after a little bit of trouble at the border i now have them  Anyway, on to my question, i'll have 3" pipes coming off the short tube headers, and was planning on installing a balance pipe, and since i'd be fabbing it myself figured that an H pipe would be easiest to fabricate. So my question is, with 3" pipe would i want a 3" cross tube or would 2 1/2" or so be big enough to even the pulses.
Also will just Grade 8 hardware work for header bolts or do i need to get something special?
[This message has been edited by Dubz (edited 08-19-2005).]
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trashline
Gearhead Posts: 1727
From: Levittown, Pa
Registered: Dec 2003
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posted 08-19-2005 08:45 PM
I honstly think it is a waist to run all three inch. the more flow is needed closer to the motor b/c the gases are so hot that they take up more room. they move to the bottom of the car and exit. I ve read it was ok to run the same size from the header or DP to the muffler but a smaller size will be perfectly fine after the muffler. It is also better to have the H or X pipe closer to the headers as possible. this i dont know why as It is what I read. probably b/c it allows the exhuast flow to even out closer creating less drag for the motor.so I say use 3 inch to the mufflers then run 2.5 inch duals. and use a 3 inch H pipe.------------------
88 thunderbird TC 2.3L
66 mustang 200ci 3 speed
68 Fairlane 289 w/ auto
79 f150 300 3 onda tree
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68 Coop
Gearhead Posts: 2408
From: Mesquite, NV. 89027
Registered: Oct 2004
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posted 08-19-2005 09:42 PM
I found this, it looks like a long read, but informative. Hope it answers them for you.http://www.nsxprime.com/FAQ/Miscellaneous/exhausttheory.htm ------------------
William 68 Coupe
289
Edelbrock 600
Performer Intake
Headers/X-pipe/Flowmaster 30's
C4
8"rear/2:79gears
"Restomod in Progress" Good friends are hard to find, even harder to leave, and impossible to forget.
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Dubz
Gearhead Posts: 1849
From: Manitoba Canada
Registered: Oct 2002
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posted 08-20-2005 12:17 AM
Thanks for the repliesThe plan is for 3" from the headers to the h pipe, and then after the h pipe using the flowmaster reducers to 2 1/2" through the mufflers.
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68 Coop
Gearhead Posts: 2408
From: Mesquite, NV. 89027
Registered: Oct 2004
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posted 08-20-2005 04:37 AM
Dubz, just being nosey, but what size is your engine???------------------
William 68 Coupe
289
Edelbrock 600
Performer Intake
Headers/X-pipe/Flowmaster 30's
C4
8"rear/2:79gears
"Restomod in Progress" Good friends are hard to find, even harder to leave, and impossible to forget.
IP: Logged |
Dubz
Gearhead Posts: 1849
From: Manitoba Canada
Registered: Oct 2002
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posted 08-20-2005 04:48 PM
351W, 3" pipes will i imagine be too big for the motor at the moment, but i have free 3" pipe, and the stock was 2 1/4" until the Y and then it was 2 1/2" single.I figure being on the big side will be as ok as being on the too small side now [This message has been edited by Dubz (edited 08-20-2005).]
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Dubz
Gearhead Posts: 1849
From: Manitoba Canada
Registered: Oct 2002
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posted 08-22-2005 08:08 PM
So can anyone tell me if grade 8 hardware is good enough? Any idea what size too?3/8 - 16? length?
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steve'66
Gearhead Posts: 9330
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 08-22-2005 08:13 PM
Dubz,You'll need header bolts, 3/8-16 with 3/8 or 7/16 hex heads to clear the tubes. SteveW
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Dubz
Gearhead Posts: 1849
From: Manitoba Canada
Registered: Oct 2002
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posted 08-22-2005 08:31 PM
Guess it'll be a project for tommorow then, as if i need specific header bolts, i doubt i can find them at this hour.Thanks for the quick reply
[This message has been edited by Dubz (edited 08-22-2005).]
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Dubz
Gearhead Posts: 1849
From: Manitoba Canada
Registered: Oct 2002
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posted 08-24-2005 01:20 PM
Just got the stock manifolds off, and there is no gasket....i was shocked. how is that possible?
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trashline
Gearhead Posts: 1727
From: Levittown, Pa
Registered: Dec 2003
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posted 08-24-2005 01:46 PM
I belive all cars are like that. they dont come from the factory with a gasket, but since you broke the seal it might be a good idea to put gaskets on. when I redid the head on my turbo coupe there was no gasket. I didnt put one on either just cleaned up the surfaces .------------------
88 thunderbird TC 2.3L
66 mustang 200ci 3 speed
68 Fairlane 289 w/ auto
79 f150 300 3 onda tree
IP: Logged |
Dubz
Gearhead Posts: 1849
From: Manitoba Canada
Registered: Oct 2002
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posted 08-24-2005 01:57 PM
cool!I have no idea of the straightness of the headers i got so i am for sure using a gasket
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