Maybe I'm not searching correctly, but I know I've read some about manifold elbow sizing before.

Anyone have any suggestions for the ID and radius sizes for ramhorn and log manifolds? I can get 1.5" sch5 (.065" wall) SS elbows for half that of 1.5" sch10 elbows, and those for 50% less than 1.25" sch10 elbows. My d16 ports are 1.75"x1.25" ovals, so I'd guess 1.5", but I thought I saw 1.25" suggested before. I'm hoping to start making some cheap manifolds for my friends and otherwise just start practicing with the cheap TIG welder I got.

Thanks.

 

Where do you get SCH 5 from?

 

Chose whatever size has the ID most similiar to what 1.5" schedule 10/40 is. I'd suggest buying a sample piece of a few different sizes and see which one works the best. Also remember, using .065" material, you should really concider a turbo brace.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HiProfile &raquo;</TD></TR><TR><TD CLASS="quote">Maybe I'm not searching correctly, but I know I've read some about manifold elbow sizing before.

Anyone have any suggestions for the ID and radius sizes for ramhorn and log manifolds? I can get 1.5" sch5 (.065" wall) SS elbows for half that of 1.5" sch10 elbows, and those for 50% less than 1.25" sch10 elbows. My d16 ports are 1.75"x1.25" ovals, so I'd guess 1.5", but I thought I saw 1.25" suggested before. I'm hoping to start making some cheap manifolds for my friends and otherwise just start practicing with the cheap TIG welder I got.

Thanks. </TD></TR></TABLE>

Where are you getting sch5 90*s for half the price of sch10? That means we'd have to sell sch5 for $2.13/ea...and that's never going to happen LOL!

 

http://cgi.ebay.com/1-5-Stainl...wItem

Ebay has everything... including the $1M+ cnc's I'm usually networking.

But as usual, the shipping sorta kills you. There's the multiple item discount, but still. Anyways, I'll be doing this with a HF TIG, so would I be better off with the thicker stuff? (only need non-production, 'hobby quality' welds) Also, I know stainless has much better heat retention/reflection properties than mild steel, so would the thinner stuff be a heat issue? And yes, I was thinking the thin stuff would need a brace, since its aproaching ss-auto thinness.

 

I'd go thicker with 2 passes. In order for a .065" turbo manifold to hold up to your daily beatings it would need REALLY solid welding along with a brace. Poor welding will result in failure. A good brace will take a good bit of the risk away, but its still higher than with a thicker material. With 2 decent passes on .109"(schedule 10) material, you are looking at atleast as much penetration as you would have with the .065" material. Since you are doing the work yourself, you have some room to play. Experiment and see what happens. I'd personally get a price quote from this guy on ebay and also from mbpwrx. I'd be curious who can give the best price in the end. As you stated, ebay shipping can really kill you.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HiProfile &raquo;</TD></TR><TR><TD CLASS="quote">http://cgi.ebay.com/1-5-Stainl...wItem

Ebay has everything... including the $1M+ cnc's I'm usually networking.

But as usual, the shipping sorta kills you. There's the multiple item discount, but still. Anyways, I'll be doing this with a HF TIG, so would I be better off with the thicker stuff? (only need non-production, 'hobby quality' welds) Also, I know stainless has much better heat retention/reflection properties than mild steel, so would the thinner stuff be a heat issue? And yes, I was thinking the thin stuff would need a brace, since its aproaching ss-auto thinness.</TD></TR></TABLE>

THOSE ARE NOT 1.5" SCH5!!!! There is a major difference between the traditional pipe size bends and these tube sized bends this ebay ad is listing!!

That is a 2wcl which is the call out for a sanitary TUBE OD fitting. This elbow is actually 1.5" OD x 16ga (.065")...not 1.9" OD x .065" like a true 1.5" PIPE size elbow.


Modified by mbpwrx at 11:25 PM 5/24/2006

 

I probably will try both vendors. As far as sizing, I dont know pipe designations, looked up .065 wall, and assumed sch5. I wasn't thinking 16ga, since mandrel bends tend to get thinner after working them, and fittings rated for pressure tend to be consistent thicknesses.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HiProfile &raquo;</TD></TR><TR><TD CLASS="quote">I probably will try both vendors. As far as sizing, I dont know pipe designations, looked up .065 wall, and assumed sch5. I wasn't thinking 16ga, since mandrel bends tend to get thinner after working them, and fittings rated for pressure tend to be consistent thicknesses.</TD></TR></TABLE>

1.5" sch5 does have a .065" wall...but that doesn't mean all 1.5" .065" is sch5. Those 2wcl's you are looking at are a tube od bend and not pipe size.

Sch5/10/40/etc refers to pipe. 16ga or .065" (or any decimal size) refers to tube size. The 1.5" bends and tees that are normally used for manifolds are actually 1.900" OD instead of the actual 1.5" OD (the bends you are looking at).

EDIT: I'm not advertising or trying to sell a product here...I just want to make sure you get the actual item you are looking for. Pipe and tube sizes can be pretty tricky sometimes and it doesn't help that some of the sizes overlap.