Does Hyperstrada 939 Oil Cooler Fit on Hyperstrada 821?

mattbkk · Apr 5, 2017

I have a 2014 HS821, just bought it second hand. Great bike but it runs pretty hot, especially two up in Bangkok traffic, and especially at the moment which is our hot season. I just saw the HS939 has an oil cooler which the 821 does not. Can anyone advise on whether this oil cooler can be used on an 821?

monocog007 · Apr 5, 2017

I believe in the current state, no. At least not easily. This is because the oil pressure sensor would have to be moved from it's current location.

zibbit u2 · Apr 5, 2017

Oil pressure switch relocation isn't a huge issue, all it essentially requires is a new fitting attached into the clutch side case, then the oil cooler lines attached.

I would be most concerned about what direction the oil takes through the various galleys within the motor, or if the oil return would actually do anything on the 821 motor. Another aspect to consider would be if the oil pump on the 939 puts out more volume than the 821.

kuksul08 · Apr 5, 2017

I've never found my 821 to run hot, even on hot days. Unless you're not moving at all. In fact I thought my thermostat was stuck open because it runs on the cool side.

I would look into water wetter and maybe a manual radiator fan switch before machining the engine to fit an oil cooler.

gatdammit · Apr 5, 2017

I did many thousands of miles in 100+F traffic. I would normally see the coolant temp hit 212F and not a digit more. I never knew the radiator fan was running until I turned the motor off. I am impressed at how little heat I feel in my crotch and legs. Every other bike I owned would just spew hot air onto my thighs and radiate to my crotchal region.

I would entertain this mod if it were easy, but not necessary in my opinion.

mattbkk · Apr 5, 2017

Thanks for the replies. I have never heard of a water wetter and will look into it. If anyone has experience with that, please share. I know two other HS821 riders here in Thailand and we all have the same issue with our bikes running hot in the city.

zibbit u2 · Apr 5, 2017

Do you have radiator guards on your bike? Just having those will keep the radiators extra warm by restricting airflow to the rads.

mattbkk · Apr 5, 2017

Glad to hear you're all doing fine in Florida and California. Roads in Bangkok are much tighter than American cities (I have visited LA, Miami, NYC etc) so there sometimes isn't room for lane splitting etc. You can be crawling along or stationary for 10-20 minutes at a time and the ambient temperature is horrendous. I've seen at least 105 degrees C on the gauge (221F), heat pours out of the bike, especially the left side. I have had to stand on the pegs to get my thigh away from it. There are no radiator guards on this bike Zibbit, but thanks for the idea. Actually it's in pristine condition with no mods at all. So I'll look into the wetter and will be grateful for any further suggestions.

zibbit u2 · Apr 6, 2017

I would suggest maybe wrapping the exhaust or thermal coating it. It might lower the ambient temperatures around the bike which might help keep the bike cooler, and as an added bonus keep you cooler in the mean time.

Water Wetter from what I understand is just another type of coolant with a similar boiling temperature. What you're trying to accomplish is more cooling. Typically that's done via heat extraction from the radiator.

If you've got a radiator shop that can produce thicker core radiators, then get them to re-create a larger or thicker radiator using the same mounting points. Just having a more efficient design with a larger core can extract more heat from the fluid, thus keeping the temperature lower.

Another option, as posted above is adding another fan on a switch that you can control to push more air through the radiator.. Unfortunately the only downside is you'll be feeling that extra warm air rushing past your thighs.

dragoontwo · Apr 6, 2017

kuksul08 said:
I've never found my 821 to run hot, even on hot days.

I would have to look at where it is actually located, but it may have to do with where the Coolant temperature sensor actually is in the loop. I have seen my bike to appear to run cool, and not get to temp on colder days <50 F.

This really shouldn't happen with a thermostat in the loop. Unless it doesn't work that well. I've never tested it to see when it really starts to open.

gatdammit · Apr 6, 2017

Lane splitting is only legal in California.
There's already 2 fans behind the stock radiator. Not sure where you would fit another.
Pretty sure my fan comes on around 210F. The highest temps I see on hot days is 212F and the fan is always running then.

Monstard · May 20, 2017

I'm on the same boat as the TS. I live in the philippines, we only have dry and wet season, as well as monstrous traffic jams in manila. During dry season, ambient air temperatures of up to 40C is quite normal. Couple that with being stuck in traffic and the coolant temp shoots up to 110C. At that temp, the motor often stalls when rolling off the throttle in stop and go traffic. The subframe where my thighs rest heats up to a level unbearable to any normal human even with thick denim trousers. I sometimes stop at a gas station and wipe down the subframe with wet rag for it to cool down enough so i can ride it. The oil cooler mod makes perfect sense. I'm also interested in any mod that will keep temps lower

Sent from my SM-G935F using Tapatalk

mattbkk · Nov 3, 2017

Just to conclude this thread: I bought a switch from aliexpress to manually control the radiator fan and it helps a lot. I turn on the fan manually when entering the city and leave it on until I'm home. Still hot, but more bearable. Doesn't draw too much additional power and bike starts as normal even after leaving the fan on full time.

mattbkk · Mar 2, 2018

Further update: Couple of months ago I neared home with the fan switch on. Suddenly the dashboard lit up like a Christmas tree. I made it home, but with the error messages I wasn't confident to ride it further so took it on a truck to the local unofficial Ducati guy. He said the fan was on, but temp still reached the point where the ECU tried to start the fan, realised it was already on, and got confused. So, he took my switch off and cleaned the radiator with brake cleaner until it looked like new. Since then the bike is still reaching 104C but not spewing hot air out of the sides to the same extent and I consider the problem permanently solved. Thanks to all for the input, I appreciate it. And the Hyper has actually become my city bike of choice

WJJ · Oct 19, 2023

mattbkk said:
Further update: Couple of months ago I neared home with the fan switch on. Suddenly the dashboard lit up like a Christmas tree. I made it home, but with the error messages I wasn't confident to ride it further so took it on a truck to the local unofficial Ducati guy. He said the fan was on, but temp still reached the point where the ECU tried to start the fan, realised it was already on, and got confused. So, he took my switch off and cleaned the radiator with brake cleaner until it looked like new. Since then the bike is still reaching 104C but not spewing hot air out of the sides to the same extent and I consider the problem permanently solved. Thanks to all for the input, I appreciate it. And the Hyper has actually become my city bike of choice

I'm planning to install manual fan switch on my 2014 Hyperstrada.

I looked into wiring diagram, both fans are wired directly to black box. There is no fan relay in between.

Can u share, How u wire the manual fan switch?

Does Hyperstrada 939 Oil Cooler Fit on Hyperstrada 821?

mattbkk

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