My engine builder put J pipes on my engine....one of them is about 1/16" below the head & the other is about 1/8" below. I do not know where he bought them but, I feel they are to close to put heat shields on them......are there ones made that drop further below the head?
Don
J pipe too close to head
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J pipe too close to head
retired mech engr living in central florida
- sideshow
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Re: J pipe too close to head
I have observed that the more expensive J-tubes have a shape that follows the heater box innards. They drop away from the head and lack the shell for the heat exchanger. CSP has a good example http://www.csp-shop.com/products/Produc ... 5922c/det/
Cheap J-tubes seem to be a straighter design, I have never measured nor cared much. Just try to stop buying cheap crap.
Cheap J-tubes seem to be a straighter design, I have never measured nor cared much. Just try to stop buying cheap crap.
Yeah some may call it overkill, but you can't have too much overkill.
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Re: J pipe too close to head
I did not buy them my engine builder did. Does anyone know where I can
buy USA made that drop away from the head like the one shown ....in steel
not stainless? I want to weld on it so mild steel is better for me.
Don
buy USA made that drop away from the head like the one shown ....in steel
not stainless? I want to weld on it so mild steel is better for me.
Don
retired mech engr living in central florida
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Re: J pipe too close to head
can not find any so I will make it......Don
retired mech engr living in central florida
- FJCamper
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Re: J pipe too close to head
Hi Weldvair,
The fix for too-close J-pipes -- which transfer heat to the head -- is to cut a simple sheet metal heat shield that is fastened to the J-pipe.
Cut the shield as a rectangle, and notch it so stainless steel hose clamps will hold it to the top of the pipe so it is between the pipe and the head.
This works very well.
FJC
The fix for too-close J-pipes -- which transfer heat to the head -- is to cut a simple sheet metal heat shield that is fastened to the J-pipe.
Cut the shield as a rectangle, and notch it so stainless steel hose clamps will hold it to the top of the pipe so it is between the pipe and the head.
This works very well.
FJC
- Marc
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Re: J pipe too close to head
You might also try loosening the nuts on the exhaust flanges and see if the tubes will shift downward a little. Or (with the nuts tight) remove the header and insert a jackhandle into the J-pipes and tweak them down slightly....a ¼" clearance should be enough to allow for heat shields.
Gas-heater Things come from the factory with undercylinder tin designed for J-pipes, you'll probably want to emulate them.
Something like this: http://i144.photobucket.com/albums/r173 ... G_0134.jpg ....'cept I'd use a softer radius at the top so there'd be less chance of denting the pushrod tubes if something ever smacked up on the bottom.
Gas-heater Things come from the factory with undercylinder tin designed for J-pipes, you'll probably want to emulate them.
Something like this: http://i144.photobucket.com/albums/r173 ... G_0134.jpg ....'cept I'd use a softer radius at the top so there'd be less chance of denting the pushrod tubes if something ever smacked up on the bottom.
- Max Welton
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Re: J pipe too close to head
I think the j-tubes sold by Berg clear correctly.
Max
Max
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Re: J pipe too close to head
I got them so I have a little more clearance....I will now make shields like Mark showed....thanks
for every ones help.
Don
for every ones help.
Don
retired mech engr living in central florida