Will motor timing affect ESC temp?

[tlandauer]

I have a UL -1 motor on a AC VS1 Tunnel. ESC is Seaking 120. I know AC ESC setting is 10* and the closest I have is 11.25*. All this is simple.
I am not looking for gains in speed. ( I am plenty happy with the speed), temp on the motor is non-issue as it is in open air and water is circulating thru.
ESC temp was also low at 110*, however the caps were at 160* !! Infact they were bulging a little and I spend the afternoon changing them. I know more timing may or may not increase RPM but can help with efficiency, may help keep the temp lower to a point. But I seem to recall most often here @ the Forum people are recommanding dialing back timing advance to help the motor to run cooler, my question is does lower timing help the ESC run cooler? And if so would the caps be cooler as well?

Running Skylipo 4s, 5000mah, 40C. ---I know battery can be an issue if the discharge rate is too low thus producing too much ripple current, I hope this is not the case as these batteries are in good condition and I run them on all my other 4s set ups.

[Fluid]

As timing is increased above "normal" for a motor amp draw increases, so yes, more timing can increase ESC temperatures. But 1 or 2 degrees above normal will not cause your problem. Hot caps usually means too much impedance in the wiring and voltage ripple. Shorten your power wires as much as practical - this means the total length from the pack to the ESC board and even a few inches can help. If you cannot do that, then add a cap board to the ESC.



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[stadiumyamaha]

I run that same setup in my sons geico and have never had any heat issues.
I've got the timing set at 11.25 as well.
A couple of things come to mind in you setup.
One, I've experienced that on a tunnel you normally have to have much longer wires to set them up which will cause the problem your explaining if that's the case with your rig.
And two, it has also been my experience that with tunnels you tend to be on and then off the throttle much more often than other boats which could cause more rippling. With the geico we can run wide open the whole run which is much easier on equipment. Jmo.
You may try one of the castle cap banks.

[BHChieftain]

I had this same problem with my OPC tunnel-- I chopped the ESC to Battery wires down per Fluid's advice and caps are much much better now (my ESC leads are about 1" long now as the ESC sits right in front of the lipos). Note, I had to lenghen the ESC wires to the motor but that has not caused any problems.

Chief

[tlandauer]

Thank you guys for the invaluable input!
Ordered a Castle cap banks and will see what happens, shortening the ESC to Battery wire is certainly another option. I think the on-off throttle was def a cause as that was my maiden. Now that I think of it, might have been mislead by the motor temp during my temp checks, I was careless and might not have aimed at the caps properly.

[tlandauer]

Will hopefully have time this weekend, added a CC Cap Pack:DSCN3333_3535.jpgDSCN3335_3537.jpg. Will see if temp can be controlled better.

[tlandauer]

The CC Cap Pack certainly helped, I took temp ASAP after run and highest is 140*, I now realized i damaged the motor jacket outlet nipple by turning in too much, it was touching the motor can and thus blocking the water, spending the afternoon changing to an OSE jacket and fabricating a water outlet so I can see better. Static test with a syringe showed much higher water volume at outlet. The OSE jacket has higher profile and affords much better clearance between the motor can, allowing freer water flow. I hope to test the temp again next week.
Before:DSCN3342_3544.jpg
After:DSCN3396_3597.jpg, DSCN3398_3599.jpg

[stadiumyamaha]

Looks great. Nice job on the outlet. Looks cooler too. Pun intended.
I really dig the cc cap banks. Very easy to install and work well.

[tlandauer]

Looks great. Nice job on the outlet. Looks cooler too. Pun intended.
I really dig the cc cap banks. Very easy to install and work well.

Thanks!