Boats For Sale:
Intake hose options |
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NeilMcG 
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Joined: September-20-2021 Location: Pittsburgh, PA Status: Offline Points: 200 |
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 Topic: Intake hose optionsPosted: June-24-2022 at 11:30am |
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Is hardwall hose really necessary for the raw intake and the feeds to the manifolds?
Could the heavy duty stuff at tractor supply be sufficient? My brand new MPI hose arrived, but alas it is 1.25 and i need 1in so I'm scrambling around trying to find something. |
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desertskier
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Joined: December-19-2006 Location: Az Status: Offline Points: 1114 |
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Posted: June-24-2022 at 12:08pm |
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On the suction side you want hose that won't collapse.
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92 SN - Owned since 93
99 Pro Air 89 SN - Went to live on a lake in Texas 75 Donzi 16 - Sold in 93 |
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gun-driver
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Joined: July-18-2008 Location: Pittsburgh, Pa Status: Offline Points: 4112 |
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Posted: June-24-2022 at 12:20pm |
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The feeds to the manifolds can be soft wall, but the suction side to the pump should be reinforced.
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Jonny Quest
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Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2840 |
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Posted: June-24-2022 at 3:13pm |
+1 JQ |
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2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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Fl Inboards
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Posted: June-24-2022 at 3:34pm |
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a pcm raw water pump can suck a tennis ball through a garden hose. Reinforced hose is truly a necessity on the intake side.. |
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Hobby Boats can be expensive when the hobbyist is limited on their own skill and expertise.
1993 Shamrock "fat" 20. 2008 Nautique 196 5.0 |
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 10643 |
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Posted: June-24-2022 at 5:54pm |
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Well so far it's been said that you need a hose that won't collapse and it needs to be reinforced ............but with what?
Wire, or can you use a good reinforced with nylon heater hose like Gates Green Stripe heater hose just as an example? Since water for all practical purposes isn't compressible, if you have that heater hose with no wire, it's not gonna collapse because of pump suction as long as it's full of water, unless you have a crazy sharp bend or kink in the hose that's really restrictive or you plug up the suction grate with some stray weeds or plastic or something. Now whether you have wire reinforced hose or the good heater hose mentioned above if you plug up the suction or restrict it enough so that the pump is sucking on the hose with no flow (and trying to collapse it), the first thing that you'll probably notice is the engine overheating So if you have a kink or sharp bend to make, the wire reinforced hose will resist the kinking better, otherwise the nylon reinforced heater hose should be just fine. I sure hope it's OK, since I've been using the non wire reinforced stuff for around 40 or so years now with smooth flowing non restrictive hose routing with no issues  Lots of those years were on a SN with hose routing just like Neil's boat And there are other engine outfits that don't use the wire stuff either Now if it's some thinwall flimsy easy to kink stuff that's a different story
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gun-driver wrote: