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Radiator hoses so big ID Why?
Posted: Tue Aug 30, 22 8:48 am
by TIB3300
So am trying to cool the old girl down in traffic, I posted a question about bypass hose ect! Thanks for the input
Anyhow got me to thinking?
Why do the top and bottom radiator hoses have such a large ID?
As the thermostat hole is so much smaller in relation to them.
Radiator hose ID 38mm
Thermostat hole size 25mm
Re: Radiator hoses so big ID Why?
Posted: Tue Aug 30, 22 6:48 pm
by Blue
I don’t have the answer but the lower hose is bigger than the top, 1-3/4” as opposed to 1-1/2” I prefer to use Mr Gasket high flow thermostats which have a larger than normal orifice.
Re: Radiator hoses so big ID Why?
Posted: Thu Sep 01, 22 9:35 am
by Dave999
flow is better in a fat pipe, less pipe wall contact per unit of coolant middle of fat pipe is bigger than middle of a thin one etc flow is better
stat needs to be smaller to provide load for the pump
otherwise the pump can thrash the water so much it splits molecules away from each other making bubble of pure empty SPACE
which when they pop (inwards rather than outwards) can errode the pump, impellor and block face.
the restriction provided by the stat dictates the pressure the pump see's and coolant under pressure is harder to thrash into vacuum filled bubbles than coolant that isn't
Dave
Re: Radiator hoses so big ID Why?
Posted: Thu Sep 01, 22 9:40 am
by Blue
Good answer Dave other than pressure and flow I wasn't sure of what else was going on.
Re: Radiator hoses so big ID Why?
Posted: Thu Sep 01, 22 6:27 pm
by Stu
Every day’s an education.
Re: Radiator hoses so big ID Why?
Posted: Thu Sep 01, 22 9:35 pm
by Kev
Cavitation
Re: Radiator hoses so big ID Why?
Posted: Mon Sep 05, 22 9:34 am
by Dave999
Indeed
Dave
Re: Radiator hoses so big ID Why?
Posted: Wed Sep 21, 22 7:20 am
by TIB3300
Dave999 wrote: Thu Sep 01, 22 9:35 am
flow is better in a fat pipe, less pipe wall contact per unit of coolant middle of fat pipe is bigger than middle of a thin one etc flow is better
stat needs to be smaller to provide load for the pump
otherwise the pump can thrash the water so much it splits molecules away from each other making bubble of pure empty SPACE
which when they pop (inwards rather than outwards) can errode the pump, impellor and block face.
the restriction provided by the stat dictates the pressure the pump see's and coolant under pressure is harder to thrash into vacuum filled bubbles than coolant that isn't
Dave
Thanks Dave
My apologies for the slow reply, been in wales with the van and limited internet and mobile devices , I cant get my head around properly
Again thanks