Horton Fan Clutch

[Bob Criss]

Hi Don

I just rebuilt my Horton clutch and had it reinstalled. I read that you are trying to set up a system that tells you when the fan is engaged. I just returned from Flordia and I can hear the fan enguaging and dis-engaging while driving. I decided to measure the time when it was engaged vrs the time dis-engaged. Found that the fan only spent about one mile not running and about a half mile running to cool the engine. Seems like to much cycleing to me so I borrowed a gauge that measures air preccure in inches of water. By placing a plastic line behind the radiator I found that there is NO air moving out the back (thru the rad) at speed!! Then I moved the gauge to the side and again found no air movement until the fan came on! I am now working on some kind of scoop for the sides or bottom to force air through the rad without running the fan as it takes around 15 horsepower I am told.

Any
thoughts on how much/often your fan cycles?

Does your SP36 have horizontal pans on both sides on the bottom of the battery area and the air filter on the curb side? Mine is open on the curb side.

This is a puzzle I am fighting since I just put a rebuilt CAT engine in along with a new radiaor and now it doesnt seem to cool as well as the old stuff??

Bob Criss

Bethel Park, PA

90SP36

---

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[Gregory OConnor]

Bob, I have a air clutch on a Cummins N14 truck that cycles on like
you describe. The N14 only does 2000 rpm and I dont like the stress
on the belts when the fan clutches up. I think this fan clutch
stress contributes to all the FC belt problems and horton failures
because the cat does 2800 rpm and it clutches up reguardless of the
engine speed at the time that temp call for a fan. I can only
imagine that the belt and components get a major hit.

I installed a switch on my N14 to turn the fan on at slower RPM and
cycle it less

GregoryO'Connor
94ptRomolandCa


eForum@yahoogroups.com, Bob Criss wrote:
>
> Hi Don
> I just rebuilt my Horton clutch and had it reinstalled. I read
that you are trying to set up a system that tells you when the fan
is engaged. I just returned from Flordia and I can hear the fan
enguaging and dis-engaging while driving. I decided to measure the
time when it was engaged vrs the time dis-engaged. Found that the
fan only spent about one mile not running and about a half mile
running to cool the engine. Seems like to much cycleing to me so I
borrowed a gauge that measures air preccure in inches of water. By
placing a plastic line behind the radiator I found that there is NO
air moving out the back (thru the rad) at speed!! Then I moved the
gauge to the side and again found no air movement until the fan came
on! I am now working on some kind of scoop for the sides or bottom
to force air through the rad without running the fan as it takes
around 15 horsepower I am told.
> Any thoughts on how much/often your fan cycles?
> Does your SP36 have horizontal pans on both sides on the bottom
of the battery area and the air filter on the curb side? Mine is
open on the curb side.
> This is a puzzle I am fighting since I just put a rebuilt CAT
engine in along with a new radiaor and now it doesnt seem to cool as
well as the old stuff??
> Bob Criss
> Bethel Park, PA
> 90SP36
>
>
> ---------------------------------
> Never miss a thing. Make Yahoo your homepage.
>

[Donald Spithaler]

Hi Bob
You have better ears than me. I could never hear mine cycle on &
off. What water temp do you run in the north when it is cold. Mine
runs about 175. When I get to GA it is around 190. My curbside
compartment is open at floor & the street side has a floor. I would
think a scoop would be a good idea. If you come up with an idea on it
let me know. I would be interested to. I had wandered why Blue Bird
didn't put scoops on the sides..If the fan cycles as often as you say
it does it would be better to engage it once it gets up to
temperatures & leave it on.
Don Spithaler
89 SP 36'
Butler, PA Zephyrhills, FL
On Thu, Feb 21, 2008 at 9:16 PM, Gregory OConnor wrote:
>
Blue
>
>
>
>
> Bob, I have a air clutch on a Cummins N14 truck that cycles on like
> you describe. The N14 only does 2000 rpm and I dont like the stress
> on the belts when the fan clutches up. I think this fan clutch
> stress contributes to all the FC belt problems and horton failures
> because the cat does 2800 rpm and it clutches up reguardless of the
> engine speed at the time that temp call for a fan. I can only
> imagine that the belt and components get a major hit.
>
> I installed a switch on my N14 to turn the fan on at slower RPM and
> cycle it less
>
> GregoryO'Connor
> 94ptRomolandCa
>
>
>
> eForum@yahoogroups.com, Bob Criss wrote:
> >
> > Hi Don
> > I just rebuilt my Horton clutch and had it reinstalled. I read
> that you are trying to set up a system that tells you when the fan
> is engaged. I just returned from Flordia and I can hear the fan
> enguaging and dis-engaging while driving. I decided to measure the
> time when it was engaged vrs the time dis-engaged. Found that the
> fan only spent about one mile not running and about a half mile
> running to cool the engine. Seems like to much cycleing to me so I
> borrowed a gauge that measures air preccure in inches of water. By
> placing a plastic line behind the radiator I found that there is NO
> air moving out the back (thru the rad) at speed!! Then I moved the
> gauge to the side and again found no air movement until the fan came
> on! I am now working on some kind of scoop for the sides or bottom
> to force air through the rad without running the fan as it takes
> around 15 horsepower I am told.
> > Any thoughts on how much/often your fan cycles?
> > Does your SP36 have horizontal pans on both sides on the bottom
> of the battery area and the air filter on the curb side? Mine is
> open on the curb side.
> > This is a puzzle I am fighting since I just put a rebuilt CAT
> engine in along with a new radiaor and now it doesnt seem to cool as
> well as the old stuff??
> > Bob Criss
> > Bethel Park, PA
> > 90SP36
> >
> >
> > ---------------------------------
> > Never miss a thing. Make Yahoo your homepage.
> >
>
>