Ways to reduce motor heat?

[Quinc]

Now that its cooling off I have been riding more (80-90F) I like riding steep trails but keep going into thermal protection limited power and having to stop. Anyone try anything to get more air flow to the motor or ways to cool the motor? My egg display shows 88c when it loses 40-50% power. on flat ground going 20-30+ mph the bike stays around 70c. But slow hill climbs she goes right up to 88c.

[stts]

I had on order a few tiny 12v fan control circuits and a round shaped heat sink. I planned on cutting out a round section to mount on my motor and hook a fan to. That would have given me some cooling in the area where the mosfets are mounted. That's the idea I planned to pursuit. The parts, however have been held up for unknown reasons. So my progress is stalled for now. But I will end up with a fan on my motor. Probably a small squirl cage motor like in laptops that will draw air from a tube going higher that wont get dirt clogged. The fan will blow onto the heatsink chunk to help keep it cooler. I may even have it controlled by a thermal sense circuit. Fan runs only when the temps get higher. Now that things are stalled, I have more time to work out those details. Chinas got circuits for doing anything. For those that can get them...

[JohnKol]

Now that its cooling off I have been riding more (80-90F) I like riding steep trails but keep going into thermal protection limited power and having to stop.

Do you have an aftermarket controller? I use my stock Sur Ron exclusively at OHV trails doing very steep hills and it has never gone into thermal protection.

[Quinc]

Do you have an aftermarket controller? I use my stock Sur Ron exclusively at OHV trails doing very steep hills and it has never gone into thermal protection.

72v bac4000. I normally ride at 40% max power but changed it to 35% to see if it makes a difference. Need to take a closer look around the motor and see if I can drill some holes or something for more air flow.

[-shaggs-]

My Sintech kept overheating my OEM battery. Only did it if I kept the throttle wide open too long. The bike would die and I'd turn the key off and back on and it would keep going. I'd pay more attention to my throttling after that. Messed with some settings and it got better. So, IMO, its more about how you are riding than anything.

[stts]

72v bac4000. I normally ride at 40% max power but changed it to 35% to see if it makes a difference. Need to take a closer look around the motor and see if I can drill some holes or something for more air flow.

NOOOOOOO. Absolutely do not breach the motors seal against moisture intrusion. At most drill a hole thru a cooling fin to make an attachment point for something. Never drill into the motor. You are sure to drastically reduce its life span.

[-shaggs-]

NOOOOOOO. Absolutely do not breach the motors seal against moisture intrusion. At most drill a hole thru a cooling fin to make an attachment point for something. Never drill into the motor. You are sure to drastically reduce its life span.

I think they meant drilling into the bash guard for more air flow. Not actually drilling into the motor.

[stts]

Well its good to be clear about it. Lots of people out there that see ventilated motors and then get crazy ideas.

[JohnKol]

72v bac4000. I normally ride at 40% max power but changed it to 35% to see if it makes a difference.

Did the extra power help your riding? In all situations I encounter, I'm limited by traction, not power. Maybe you have aftermarket wheels with wider tyres?

[Quinc]

I think they meant drilling into the bash guard for more air flow. Not actually drilling into the motor.

This ^^

Or maybe some kind of fan, or heatsink mod/upgrade. (hoping someone has done this and can confirm if its worth it.)

[Quinc]

Did the extra power help your riding? In all situations I encounter, I'm limited by traction, not power. Maybe you have aftermarket wheels with wider tyres?

The short wheel base deff doesn't make climbing any easier. I am running mx rims 18/21 with mx33 tires. I have a-lot more traction over the oem wheels. But going to 50% + power with the BAC and I end up with a lot more wheel spin.

[JohnKol]

The short wheel base deff doesn't make climbing any easier. I am running mx rims 18/21 with mx33 tires. I have a-lot more traction over the oem wheels. But going to 50% + power with the BAC and I end up with a lot more wheel spin.

Yeah, the short wheelbase is the other major limitation in hill climbing. Running 18/21 (I presume 100/100-18 and 80/100-21?) will obviously give you a lot more traction, but also a lot more weight to spin up, so more power would help.

Did you install the 18/21 wheels before going to an aftermarket controller? How was the stock controller/motor handling the bigger tyre?

[Quinc]

Yeah, the short wheelbase is the other major limitation in hill climbing. Running 18/21 (I presume 100/100-18 and 80/100-21?) will obviously give you a lot more traction, but also a lot more weight to spin up, so more power would help.

Did you install the 18/21 wheels before going to an aftermarket controller? How was the stock controller/motor handling the bigger tyre?

I bought the bike already setup with the wheels and controller etc. Bike has an 80T rear sprocket so she has a ton of torque. :) If you are ever up in Norcal area hit me up and you can take her for a spin.

[JohnKol]

I bought the bike already setup with the wheels and controller etc. Bike has an 80T rear sprocket so she has a ton of torque. :) If you are ever up in Norcal area hit me up and you can take her for a spin.

I am in NorCal, do you ever ride Carnegie or Hollister Hills? The lack of traction and short wheelbase have prevented me from clearing the White and Pink climbs, have you had any success with these?

[dirtman]

I bought the bike already setup with the wheels and controller etc. Bike has an 80T rear sprocket so she has a ton of torque. :) If you are ever up in Norcal area hit me up and you can take her for a spin.

Quote Q`n ""If you are ever up in Norcal area hit me up and you can take her for a spin.
I wish you typed that last week as I planned my get-rich-quick trip to Las Vegas. I drove my new $20,000,00 Ford to Las Vegas I came home in a $2-Million dollar greyhound bus. (LOL-joke) Thanks anyways
Sounds like a nice bike. 80-t R- sprocket. Did you have to cut back your upper chain guide.
Where did you buy an already set up SRX-LB with wheels, controllers and other upgrades.?
For the last 3 years I`ve been saving to upgrade my SRX or even considering a better E-Dirt bike but as a senior rider the 120-lb SRX-LB upgraded ready to ride version is something to consider.

PS; I have family living in Las Vegas & CA maybe next year I`ll look you up to check out your bike.