Log Manifold Builders Step Inside
This gives you one way of fish cutting the elbows. He made a tapered log but you can use a straight log and a single reducer on the end too.
http://forum.miata.net/vb/showthread...=423624&page=2
Bear in mind he did not have a counter sunk flange but relatively but welded the elbows to the flange. Counter sinking the elbow gives a cleaner weld and better looking appearance.
He did not use a thick enough flange and it warped and then had to machine it flat after final testing.
http://forum.miata.net/vb/showthread...=423624&page=2
Bear in mind he did not have a counter sunk flange but relatively but welded the elbows to the flange. Counter sinking the elbow gives a cleaner weld and better looking appearance.
He did not use a thick enough flange and it warped and then had to machine it flat after final testing.
Last edited by aknovaman; Apr 7, 2014 at 09:43 PM.
Thread Starter
FormerVendor
Joined: Feb 2011
Posts: 547
Likes: 1
Here is a link to a thread I posted in a few weeks back on log manifolds.
There are a few pic's posted of some very nice manifolds in this thread.
Tig ask about offering kits.
It is hard to find a inside deal on the el's to afford to stock them and offer them at a competitive price.
About the best I can do for you right now is show you where to buy the parts you'd need to build a set of manifolds.
Thanks for the complements guys.
I should have these posted to the site by the end of the week.
There are a few pic's posted of some very nice manifolds in this thread.
Tig ask about offering kits.
It is hard to find a inside deal on the el's to afford to stock them and offer them at a competitive price.
About the best I can do for you right now is show you where to buy the parts you'd need to build a set of manifolds.
Thanks for the complements guys.
I should have these posted to the site by the end of the week.
TECH Addict
Joined: Aug 2004
Posts: 2,866
Likes: 4
This gives you one way of fish cutting the elbows. He made a tapered log but you can use a straight log and a single reducer on the end too.
http://forum.miata.net/vb/showthread...=423624&page=2
Bear in mind he did not have a counter sunk flange but relatively but welded the elbows to the flange. Counter sinking the elbow gives a cleaner weld and better looking appearance.
He did not use a thick enough flange and it warped and then had to machine it flat after final testing.
http://forum.miata.net/vb/showthread...=423624&page=2
Bear in mind he did not have a counter sunk flange but relatively but welded the elbows to the flange. Counter sinking the elbow gives a cleaner weld and better looking appearance.
He did not use a thick enough flange and it warped and then had to machine it flat after final testing.
Has anyone got a cut away of a cast log? be interesting to see the internals of one.
Thread Starter
FormerVendor
Joined: Feb 2011
Posts: 547
Likes: 1
Excellent! When I had my latest tubular manifold hotside made, I'd bought some beautiful mild steel 1/2" flanges but I *assumed* they were going to be "D" shaped since the gent knew that's what I had with my LT1. Imagine my frown when I pulled them from the package to see they were all round. The mismatch between port opening and flange must produce quite the turbulence. When I replace the header gaskets from time to time, the blackened area on the flange shows I need to address this.
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Verdad Gallardo Thread Starter
FormerVendor
Joined: Feb 2011
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Here you go Dave.
I put a 1-1/2 long radi weld el up to the flange in my cad program to see how it would fit between bolts. It's not a D shaped LT1 Port but it will work well enough to get an idea of how it will fit. I don't think the SBC style flange will benefit from a pocket like the LS type flange does. However, 1-1/4 weld els could be used as the SBC flange could have a step that would fit between the bolts. 1-1/4 weld els are 1.660 OD but the ID for SCH 10 is 1.442". That would be like using 1-1/2 header tubing. Guys are not going to buy that, it ant big enough.
I have used 1-1/2 weld els for SBC headers in the past but bolt stands have to be used and that limits you 10-15 degrees of the vertical plane so header planing will be a little more challenging.
As far as the "D" port thing goes I don't think it matters that much in a turbo build.
If you where very dependent on exhaust efficiency like a full buggy N/A deal it may buy you a few pony's.
I put a 1-1/2 long radi weld el up to the flange in my cad program to see how it would fit between bolts. It's not a D shaped LT1 Port but it will work well enough to get an idea of how it will fit. I don't think the SBC style flange will benefit from a pocket like the LS type flange does. However, 1-1/4 weld els could be used as the SBC flange could have a step that would fit between the bolts. 1-1/4 weld els are 1.660 OD but the ID for SCH 10 is 1.442". That would be like using 1-1/2 header tubing. Guys are not going to buy that, it ant big enough.
I have used 1-1/2 weld els for SBC headers in the past but bolt stands have to be used and that limits you 10-15 degrees of the vertical plane so header planing will be a little more challenging.
As far as the "D" port thing goes I don't think it matters that much in a turbo build.
If you where very dependent on exhaust efficiency like a full buggy N/A deal it may buy you a few pony's.
Last edited by Chris@CBR; Apr 11, 2014 at 10:43 PM.
Thread Starter
FormerVendor
Joined: Feb 2011
Posts: 547
Likes: 1
Good morning guys.
It have the flanges up on the site, here's the link.
http://www.cbrperformanceproducts.co...s1hfss.500.htm
It have the flanges up on the site, here's the link.
http://www.cbrperformanceproducts.co...s1hfss.500.htm
Launching!
Joined: May 2012
Posts: 218
Likes: 0
From: Arlington, Tx
Good morning guys.
It have the flanges up on the site, here's the link.
http://www.cbrperformanceproducts.co...s1hfss.500.htm
It have the flanges up on the site, here's the link.
http://www.cbrperformanceproducts.co...s1hfss.500.htm
