turbo feed/return line cracking
#1
turbo feed/return line cracking
So I have been using summit racing AN lines for my turbo feed and return, and lately I have been noticing leaking by the AN fittings. Upon removal and inspection, I noticed the AN rubber will crack and stainless braid will deform. I have thought about making AN hardlines, as I believe that the extreme heat surrounding the turbo is the cause. Car is turbo and solely sees road time. My oil temps read high on my autometer sensor mounted in a sandwich plate. Has any MT member had this problem? My only concern with AN hardlines is that many AN flaring tools are not strong enough for stainless steel, and i feel other options (mild steel which may rust and aluminium maybe fatigue from our engines lovely vibrations) will not be effective.
#4
Retired Mech Design Engr
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Not Si for oil. For oil return, use Gates LOL hose. For water lines and oil lines use teflon / Stainless if hose. I'm running hard lines, well supported SST. I only have about 5k miles on them, however. I bought a WWII issue flaring tool to make the lines. Some people have had success with less expensive 37* flailing tools with SST, but it's tough.
NEVER Aluminum lines.
I used steel fittings on the turbo and oil feed. Welded aluminum fittings onto the reroute spacer and mixing manifold for the water.
I also think that the fused brake lines (coated steel) would be appropriate for turbo hard lines, but have no experience on an end to end solution.
Mazda uses a hard line for the VVT (possibly not relevant. very short and well supported).
FM sells a hard line kit, but it transitions to hose at the head.
NEVER Aluminum lines.
I used steel fittings on the turbo and oil feed. Welded aluminum fittings onto the reroute spacer and mixing manifold for the water.
I also think that the fused brake lines (coated steel) would be appropriate for turbo hard lines, but have no experience on an end to end solution.
Mazda uses a hard line for the VVT (possibly not relevant. very short and well supported).
FM sells a hard line kit, but it transitions to hose at the head.
#6
Not Si for oil. For oil return, use Gates LOL hose. For water lines and oil lines use teflon / Stainless if hose. I'm running hard lines, well supported SST. I only have about 5k miles on them, however. I bought a WWII issue flaring tool to make the lines. Some people have had success with less expensive 37* flailing tools with SST, but it's tough.
NEVER Aluminum lines.
I used steel fittings on the turbo and oil feed. Welded aluminum fittings onto the reroute spacer and mixing manifold for the water.
I also think that the fused brake lines (coated steel) would be appropriate for turbo hard lines, but have no experience on an end to end solution.
Mazda uses a hard line for the VVT (possibly not relevant. very short and well supported).
FM sells a hard line kit, but it transitions to hose at the head.
NEVER Aluminum lines.
I used steel fittings on the turbo and oil feed. Welded aluminum fittings onto the reroute spacer and mixing manifold for the water.
I also think that the fused brake lines (coated steel) would be appropriate for turbo hard lines, but have no experience on an end to end solution.
Mazda uses a hard line for the VVT (possibly not relevant. very short and well supported).
FM sells a hard line kit, but it transitions to hose at the head.
#7
mkturbo.com
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Thanks for the tips. I like the other idea of heat shielding the AN hose, but i feel that it was more of a band aid than a solution. BUT just looking at summit racing's catalog, I guess I ordered the stainless braided hose with rubber insides. The max temp on PTFE hose is 400* compared to rubber at 300*. Would the PTFE made a substantial increase in reliability coupled with a shielding?
#12
Not Si for oil. For oil return, use Gates LOL hose. For water lines and oil lines use teflon / Stainless if hose. I'm running hard lines, well supported SST. I only have about 5k miles on them, however. I bought a WWII issue flaring tool to make the lines. Some people have had success with less expensive 37* flailing tools with SST, but it's tough.
NEVER Aluminum lines.
I used steel fittings on the turbo and oil feed. Welded aluminum fittings onto the reroute spacer and mixing manifold for the water.
I also think that the fused brake lines (coated steel) would be appropriate for turbo hard lines, but have no experience on an end to end solution.
NEVER Aluminum lines.
I used steel fittings on the turbo and oil feed. Welded aluminum fittings onto the reroute spacer and mixing manifold for the water.
I also think that the fused brake lines (coated steel) would be appropriate for turbo hard lines, but have no experience on an end to end solution.
Thank you
#13
Retired Mech Design Engr
iTrader: (3)
Join Date: Jan 2013
Location: Seneca, SC
Posts: 5,011
Total Cats: 859
LOL = Gates LOL, a nitrile based hose. Comes in various colors
SST = Stainless STeel. I don't remember what grade I ended up with. I did use welded, mandrel pulled type, rather than seamless, because $$ and pressures involved (low). Basically the equivalent of stainless DOM.