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Turbo J pipe suggested gauge / wall thickness?

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62Cometman
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Turbo J pipe suggested gauge / wall thickness?

Post #1 by 62Cometman » Fri Feb 15, 2019 5:25 pm

Im wondering what yalls suggestion would be for a guage or wall thickness of piping to use as a j pipe to support a t3/t4 turbo. I weighed the turbo by itself at 14 lbs. I figured that the extra hoses and other small misc stuff would add potentially another 1.5-2 lbs max but then the down pipe would be the big factor is this instance. Do you think 16 gauge would be enough, would 11 gauge which comes out to be roughly 1/8 wall thickness be better? im gonna be using the stock style manifold with a trussed 2 bolt flange to the standard T4 flange. What are you guys running?
1962 Mercury Comet 170 ci, Dagenham Trans, 2.83:1 7.25 rear.
She ain't fast but she's fun. 8)

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powerband
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Re: Turbo J pipe suggested gauge / wall thickness?

Post #2 by powerband » Fri Feb 15, 2019 7:27 pm

Shock towers are a limitation on most Ford cars for turbo placement at exhaust outlet. I used pre-bend 2" exhaust and helped support the Turbo setup with struts to the head lift bracket, also an expansion joint allowing for thermal expansion to keep gaskets intact .

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haev fun
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drag-200stang
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Re: Turbo J pipe suggested gauge / wall thickness?

Post #3 by drag-200stang » Sat Feb 16, 2019 10:24 am

Keep in mind the turbo oil drain needs when planing the mounting and piping of the turbo.
66 Mustang Coupe
200 turbo w/lenco 4-spd
stock adj. rockers, stock timing set, ARP studs
best 1/4 mile ET 9.85/best mph 139 on 8 lbs progressing to 15 lbs boost
Went 9's when 10's was fast.

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powerband
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Re: Turbo J pipe suggested gauge / wall thickness?

Post #4 by powerband » Sat Feb 16, 2019 2:14 pm

Keep in mind the turbo oil drain needs when planing the mounting and piping of the turbo.

Good Point ! .

Most forced induction SC or Turbo will need rising rate fuel pressure referenced to the boost pressure with electric fuel pump, making mechanical FP blockoff plate available for a port.

... The BOP draw-thru in pics drained into valve cover but when oil psi increased at rpm', it would return a lot of oil. Current supercharger setup drains 3/4" line tapped into oil pan. SC setup currently uses FP blockoff plate tapped for added 3/4" direct venting of crankcase under boost. (The Turbo Draw-Thru setups carburetor is not pressurized and can use a constant pressure mechanical fuel pump )

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( the little lump on pan below port is a super strong magnet where SC oil feed returns. )
"Take time to stop and smell... The roadkill..."

Derangedfords90
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Re: Turbo J pipe suggested gauge / wall thickness?

Post #5 by Derangedfords90 » Sat Feb 16, 2019 2:15 pm

Don't over think it. I used regular old exhaust pipe. If its gonna crack its gonna crack from heat expansion and changes, not because of weight. Vibration is a factor too, but again you cant plan to exactness for whatever frequency is going to make it crack. Just gotta trial and error it.
Link to my build viewtopic.php?f=22&t=75863

Post 5 shows the regular old exhaust pipe poop-welded to a t3/4 flange.

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Re: Turbo J pipe suggested gauge / wall thickness?

Post #6 by Derangedfords90 » Sat Feb 16, 2019 2:27 pm

Here are old pictures (and one current complete photo) of my current 351w setup. Its all together now, and as you can see, all the hotside is scrap exhaust pipe. Nothing special. Off that t4 flange hangs a big old 78mm turbo. No hard mount to the engine or anything. Haven't cracked yet and its got 3000 miles on the setup as-is.
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xctasy
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Re: Turbo J pipe suggested gauge / wall thickness?

Post #7 by xctasy » Sat Feb 16, 2019 3:43 pm

Its Deranged! :thumbup:

80 thou Ford Explorer v6 or V8 exhaust pipe was mendrel formed and is simply excellent to use. :hmmm: If ts not from the Rust Belt...lincs200 the source of that info :nod:
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62Cometman
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Re: Turbo J pipe suggested gauge / wall thickness?

Post #8 by 62Cometman » Fri Feb 22, 2019 5:16 pm

New "problem" the manifold is 2" outlet but the flange for the turbo is 2.5" do you think the cheapy reducers offered by walker or whomever would be ok to adapt between the two? i will likely make some sort of support to run from the piping to one or more of the bolts holding the manifold to the head.

https://www.amazon.com/yjracing-Univers ... B07GD8JC67
1962 Mercury Comet 170 ci, Dagenham Trans, 2.83:1 7.25 rear.
She ain't fast but she's fun. 8)

drag-200stang
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Re: Turbo J pipe suggested gauge / wall thickness?

Post #9 by drag-200stang » Sat Feb 23, 2019 11:07 am

I would like to see more taper but flow is not as important on the inducer side as the exducer side...May be easier to go with a thick flange and blend the flange from the 2'' to the turbo inlet to fit , less welding and stronger seal.
66 Mustang Coupe
200 turbo w/lenco 4-spd
stock adj. rockers, stock timing set, ARP studs
best 1/4 mile ET 9.85/best mph 139 on 8 lbs progressing to 15 lbs boost
Went 9's when 10's was fast.

Twinturbor
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Re: Turbo J pipe suggested gauge / wall thickness?

Post #10 by Twinturbor » Mon Apr 15, 2019 11:41 am

I used 14g stainless in my turbo 300 and its held up just fine. Keep the turbo supported and you will be fine

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