M8 Engine Temp
Seasoned HDF Member
Joined: Aug 2011
Posts: 11,814
Likes: 5,120
From: SW Ohio
I agree.
Outstanding HDF Member
Joined: Nov 2008
Posts: 2,034
Likes: 127
My M8 is air cooled. I then hit it with another thermometer and got near identical readings, so I am satisfied I was getting an accurate reading. I have not checked it recently but my sense is that when it gets up around 90-95 degrees outside I am going to see some oil temps which are higher than what we have seen on 96" and 103" engines. I fully expect to see 230-240 degrees on a normal highway run @ 70 mph. If you are riding in city traffic where you have a stop and go situation you will see significantly higher oil temps. Exactly how high I am not sure.
I think if you are a rider who lives in a "hot" climate it should be imperative that we run a good quality synthetic oil in our M8 crankcases. And yes, a fan assisted oil cooler would probably be a good decision, especially if you ride in a "hot" climate.The brand of course is up to the individual rider as I do not wish to get embroiled in another "which brand is best" debate.
So, even though the MOCO touts the new M8 as a "cooler" running engine, I believe that they are actually referring to rider comfort instead of physically running at a cooler temperature. It does a good job of keeping the heat away from the rider and passenger but it is going to run hotter internally.
Road Captain
Joined: Mar 2017
Posts: 631
Likes: 279
From: Arkansas
What should I be looking for on my AFR numbers with a tuner? I have heard the HD Pro street tuner will not adjust enough to compensate for headers/slip on set ups. Dealer told me no more than 13:1 or slightly more. I am seeing 14.6 closed loop and 13 open loop. Do you know if I can get a data monitor without a tuner?
Road Warrior
Joined: Jul 2009
Posts: 1,408
Likes: 1,808
From: pa
As I posted earlier running in temps in mid to upper 90's my dipstick temps stayed below 230 and that was running for hours at speeds of 70-80mph along with some 40mph riding.
I'm running synthetic and have the fan assist cooler
I'm running synthetic and have the fan assist cooler
Cruiser
Joined: May 2017
Posts: 181
Likes: 37
From: Palm Coast Florida
So when I cruise on the Highway at 75 I'll stay at about 266. If I get on it to pass often I get up to about 288 and It does not come back down unless I go down to 60mph for a bit... I have an aggressive tune and love the way the bike runs but wonder about the temp...
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,900
Likes: 8,007
From: poway
So is that engine temp, cylinder head temp or oil temp?
Member
Joined: Jul 2009
Posts: 4,310
Likes: 1,079
Might be sumping...get it checked. Those are similar engine temps I was seeing but the higher temps were around 300. I'm on my 3rd 114 engine. the first 2 sumped with the stage 4 kit and required a replacement engine.
Cruiser
Joined: May 2017
Posts: 181
Likes: 37
From: Palm Coast Florida
Thanks...!
hmm does not ever loose power but I will check.
I am just reading the temp off the Power Vision
What temps should I be seeing ?
....
hmm does not ever loose power but I will check.
I am just reading the temp off the Power Vision
What temps should I be seeing ?
....
Last edited by SoZo; Aug 26, 2017 at 01:53 PM.
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Cruiser
Joined: Sep 2012
Posts: 118
Likes: 20
From: Florida
Fairly old thread but a lot of good info in it I was looking for. Mainly the head temp the M8 should be running at.
I have a 2017 triglide. I installed an oil cooled, remote filter and the small love jugs fans. Temp monitored with a PV.
So far my head temp runs at a constant 275 and coolant temp at 176 to 185. Very happy with that after reading thru this thread. Thanks to everyone who contributed....
I have a 2017 triglide. I installed an oil cooled, remote filter and the small love jugs fans. Temp monitored with a PV.
So far my head temp runs at a constant 275 and coolant temp at 176 to 185. Very happy with that after reading thru this thread. Thanks to everyone who contributed....
Road Master
Joined: Sep 2006
Posts: 1,233
Likes: 988
From:
From link, Understanding Oil Flow:
"This flow of oil serves three purposes. First, it lubricates, but cooling the engine by carrying away the heat generated by combustion is a second purpose, which is often just as important. Many engines, particularly those which are turbocharged, have oil squirts in each cylinder which are designed to direct cooling oil on the back side of the piston. And finally, the oil cleans the engine by picking up dirt and depositing it in the screens or filter, or by keeping that dirt in suspension until the oil is changed."
Last edited by panheadache; Oct 16, 2017 at 10:27 AM.