Engine Temp

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Jun 20, 2020 | 05:13 PM

#21

skratch

Seasoned HDF Member

Joined: Jan 2007

Posts: 20,616

Likes: 4,440

From: anacoco, la

my cvo 110 with catless ceramic coated headpipe, and dyno tune ran considerable hotter than my stock 114 m8 with catalytic headpipe, rinehart slip ons, and stock tune.

Jun 21, 2020 | 12:40 AM

#22

Kyle Moore

Road Master

Joined: Mar 2017

Posts: 894

Likes: 224

From: Lynden, WA

Quote:

Originally Posted by Wmitz

Get a multi bike license for the vision. The se tuner will not allow to much change, as it is a licensed epa tuner. Also look into DK Customs tank lift and cooling deflector wings. I am currently using the 1.5 inch lift with the wings, it does work.

the wings are mainly for touring bikes with lowers I believe, I will say they have made a difference on my bike. I have a 124 with ported heads etc, I have lowers on it and I feel the wings made a substantial difference in my engine temps. Riding yesterday it was 93 degrees and cruising at 70mph I felt no heat off the engine at all, before I had the wings I could, and at stop signs etc. the engine doesn’t feel like it’s burning up. Really happy with em.

Jun 21, 2020 | 12:54 AM

#23

Kyle Moore

Road Master

Joined: Mar 2017

Posts: 894

Likes: 224

From: Lynden, WA

Quote:

Originally Posted by leftyjm

I have the 107 on my Heritage with a Stage 1
I only have about 500 miles on it but this thing feels like it runs real f’ing hot compared to my 103 with the same set up, although the tuner on the 103 is a Power Vision and a Screamim eagle on the Heritage.
The 107 is still running very lean.
Anybody else feeling the heat?

I always see people saying this but even when my bike was bone stock i never thought my M8 ran hot, after talking with FM and Learning a bunch I just decided to quit worrying about it, these things were designed to run hot, someone told me
once they sell em in Saudi Arabia after all. I’m going to start running 20-60 oil in my 124 though, I have an oil pressure gauge on it and noticed the hotter it gets the lower the oil pressure gets at cruising speeds, I have the S&S pump and plate and see between 35-45psi at 2700-3000rpm depending on ambient temp, I know the engine is probably super hot when it’s 90 degrees out but it really doesn’t seem to care. The top end gets a tad noisier but that’s about it, minimal loss in power, I just love these M8s! I do have the thundermax oil cooler fan too.

Jun 22, 2020 | 10:46 AM

#24

wvedec

Intermediate

Joined: Mar 2014

Posts: 45

Likes: 4

From: Ponchatoula, LA

I have ridden my Heritage nearly 10,000 miles

Quote:

Originally Posted by KrustyKush

Now entering my third SoCal summer on the 2018 RGU. At 34k miles, I'd say the stock 107 is noticeably cooler running than the stock 2016 103 FLHTCU it replaced. The 2016 103 on a 95 degree day in steady city traffic would just about blister my right thigh. I don't get this on the 2018 M8.

I recently re-read the Cycle World introductory article from 2016 on the then-new M8. In the article, Kevin Cameron states that HD claims the M8 runs cooler than the 103. I'd have to agree with this. It "feels" cooler to me.

But, that isn't an impression gathered after a short ride on a hot day, but rather an impression created after several summers of riding in all kinds of weather and traffic. And there is the point that I would make for the OP: 500 miles is probably too short a time of riding to develop very firm opinions about engine heat. Or saddle comfort, or tires, or just about anything else. Give yourself lots of time and plenty of miles. First impressions are almost always wrong.

Hello KrustyKush,

I think you got me confused with someone else who replied to this thread. I am the OP. I have ridden my Heritage nearly 10,000 miles, so I have a lot of "seat time". I have flashed a number of different maps to the bike with my Vance and Hines FP3 tuner and have not gotten a whole lot of difference. I think I am going to flash a map for straight pipes and see if making the mixture even richer will help. Saturday I was riding at 70 mph in 90 degree heat and my engine temperature on my FP3 was 302 degrees. It would have been 276-280 degrees on my 2012 Heritage.

Wayne

Jun 22, 2020 | 11:16 AM

#25

Neil

Road Captain

Joined: Jun 2006

Posts: 723

Likes: 62

From: Cape Cod, Ma.

You cannot compare twin cam and M8 engine temps. The temp senors are in different locations and on different cylinders. Twin cams are located on the front head higher up providing more cooling airflow. The M8 is located on the rear head much closer to the combustion chamber, with less airflow and much closer to the heat source. It has been pretty well documented that if you are displaying temp with a programmer the M8 displays as quite a bit hotter. Temps from low to mid 300's are within normal range according to both Fuel Moto and DynoJet when I asked.

Neil
RDMC

Jun 22, 2020 | 12:10 PM

#26

MTBIG G

Road Warrior

Joined: Sep 2016

Posts: 1,887

Likes: 1,059

From: SE Washington

Strange, lefyjm is shown as the OP.

Niel is correct. M8s temps sensors are located in a different location than on a tc. Though m8s temp will show in the low 300s on the programmer, there is generally less heat felt by the rider. Mine will creep into the 320-330 range if I'm running uphill on a hot day, but it never feels like its running hot like my twim cams did... In stock form.

Jun 22, 2020 | 08:40 PM

#27

skratch

Seasoned HDF Member

Joined: Jan 2007

Posts: 20,616

Likes: 4,440

From: anacoco, la

Quote:

Originally Posted by wvedec

Hello KrustyKush,

I think you got me confused with someone else who replied to this thread. I am the OP

wait, you're the op? so you have 2 profiles? that 's a big no-no here on the forum....

May 7, 2021 | 10:01 PM

#28

Punjabi Rider

Grand HDF Member

Joined: Sep 2009

Posts: 3,806

Likes: 281

From: Green Country Oklahoma

I definitely know it's an old thread we just added a 2021 Heritage to our garage wow what a difference cylinder heads are over 100 degrees hotter then our twin cools.