Need reducer for 3" downpipe on 5-bolt flange?
02-21-2008, 11:31 PM
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Need reducer for 3" downpipe on 5-bolt flange?
The flange/turbine outlet is 2.5". The 3" pipe will fit if I hammer in the edges for bolt clearance, but I'm worried about flow. I assume a smooth transition would be better, but I'd like to know what everyone else is doing.
EDIT: Some pics. The one with the red circle shows how the downpipe aligns with the flange. Basically one side is flush and the other side bears the full 0.5" difference.
Modified by Legion at 12:56 AM 2/22/2008
Modified by Legion at 1:01 AM 2/22/2008
EDIT: Some pics. The one with the red circle shows how the downpipe aligns with the flange. Basically one side is flush and the other side bears the full 0.5" difference.
Modified by Legion at 12:56 AM 2/22/2008
Modified by Legion at 1:01 AM 2/22/2008
02-22-2008, 07:03 AM
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Re: Need reducer for 3" downpipe on 5-bolt flange? (Legion)
just center it up better and weld that **** on there! i had my downpipe just like that, grap your bolts and find the best spot to weld it.
02-22-2008, 01:24 PM
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Re: Need reducer for 3" downpipe on 5-bolt flange? (RCautoworks)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AaronJ »</TD></TR><TR><TD CLASS="quote">just center it up better and weld that **** on there! i had my downpipe just like that, grap your bolts and find the best spot to weld it.</TD></TR></TABLE>
That's the best it can be centered. It doesn't look that way, but I spent literally 2 hours mocking/taping it into that position before tacking it.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RCautoworks »</TD></TR><TR><TD CLASS="quote">I myself would get a 3 inch flange from atpturbo.com , or use a transition. </TD></TR></TABLE>
Well the flange opening is the same size as the turbine outlet, so a 3" flange wouldn't help.
I'm curious about the flow characteristics. I don't know if there are any ME's with knowledge in fluid dynamics around here... I'm thinking that the best course of action would be to make the outer turn of the radius flush with the flange opening so that the exhaust gases don't lose velocity. That way the inner edge of the radius would just be a low-pressure zone.
That's the best it can be centered. It doesn't look that way, but I spent literally 2 hours mocking/taping it into that position before tacking it.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RCautoworks »</TD></TR><TR><TD CLASS="quote">I myself would get a 3 inch flange from atpturbo.com , or use a transition. </TD></TR></TABLE>
Well the flange opening is the same size as the turbine outlet, so a 3" flange wouldn't help.
I'm curious about the flow characteristics. I don't know if there are any ME's with knowledge in fluid dynamics around here... I'm thinking that the best course of action would be to make the outer turn of the radius flush with the flange opening so that the exhaust gases don't lose velocity. That way the inner edge of the radius would just be a low-pressure zone.
02-22-2008, 02:10 PM
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Re: Need reducer for 3" downpipe on 5-bolt flange? (Legion)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Legion »</TD></TR><TR><TD CLASS="quote">
That's the best it can be centered. It doesn't look that way, but I spent literally 2 hours mocking/taping it into that position before tacking it.
Well the flange opening is the same size as the turbine outlet, so a 3" flange wouldn't help.
I'm curious about the flow characteristics. I don't know if there are any ME's with knowledge in fluid dynamics around here... I'm thinking that the best course of action would be to make the outer turn of the radius flush with the flange opening so that the exhaust gases don't lose velocity. That way the inner edge of the radius would just be a low-pressure zone.</TD></TR></TABLE>
theres really not much you can do with the bolted flanges. maybe weld a Vband to your housing?
That's the best it can be centered. It doesn't look that way, but I spent literally 2 hours mocking/taping it into that position before tacking it.
Well the flange opening is the same size as the turbine outlet, so a 3" flange wouldn't help.
I'm curious about the flow characteristics. I don't know if there are any ME's with knowledge in fluid dynamics around here... I'm thinking that the best course of action would be to make the outer turn of the radius flush with the flange opening so that the exhaust gases don't lose velocity. That way the inner edge of the radius would just be a low-pressure zone.</TD></TR></TABLE>
theres really not much you can do with the bolted flanges. maybe weld a Vband to your housing?
02-22-2008, 02:49 PM
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Re: Need reducer for 3" downpipe on 5-bolt flange? (CoreyR)
http://store.racing-solutions.....html
I bought one of those. Just cut some of the long unflared part off slide it into the flange and weld.
I bought one of those. Just cut some of the long unflared part off slide it into the flange and weld.
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02-22-2008, 05:02 PM
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Re: Need reducer for 3" downpipe on 5-bolt flange? (omniscient)
Quit worrying about flow. It's not worth your time unless you are trying to build something very competitive. Just weld it up and run it.
If you want to be ridiculous about it and make DP clearance twice as hard:
http://www.acestainless.com/in...Id=45
http://cgi.ebay.com/ebaymotors...ZWDVW
or go to Autozone/Pepboys/NAPA/whatever and buy a $5.00 steel reducer.
If you want to be ridiculous about it and make DP clearance twice as hard:
http://www.acestainless.com/in...Id=45
http://cgi.ebay.com/ebaymotors...ZWDVW
or go to Autozone/Pepboys/NAPA/whatever and buy a $5.00 steel reducer.
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