engine heat

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Engine heat burnt my leather jacket on my way to Colorado....You have no idea how its so terrifying to me. NO long trips for me until this .... is fixed. I burnt the limited edition jacket from Viking Cycle.
 

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RdashP said:
When touring in slow traffic on hotter days wearing Kevlar enforced moto jeans, she gives me a heat-rash on the backside of my left upper leg and even worse 2nd degree burns with blisters in both my knee cavities.
Click to expand...

This is how my back legs look on hotter days a/o slow traffic wearing moto jeans with only 1 additional Nomex layer underneath:

A9zwSI3l.jpg


With 2 layers of underwear, wearing moto jeans or street leathers with cloth in these areas at the back of my legs, its still hot but rash is almost absent.

In full racing leathers with thick cow leather in these areas at the back of my legs a/o speed riding, NO issues

Although probably not too healthy to get burned like this over and over again, I don't care too much!
It's ALWYS big fun riding her regardless #painisjustanotheremotion
 
I put on a jesters exhaust and had it ceramic coated on the inside to keep the heat in. Also did this to the headers. I can wear regular jeans in stop and go traffic at any temp and heat is not even on my mind let alone burning me. No nomex undies or extra heat shielding, etc.

Heat sensitivity must be very individual or the modifications helped a lot. The bike is truly enjoyable as a daily for me.

Sent from my SM-N975W using Tapatalk
 
My cheap solution is knee socks... actually boot socks from Wrangler. Amazon and fine retailers.
Although riding pants preferred, even with jeans I feel no heat at any concerning level.
 
RdashP said:
This is how my back legs look on hotter days a/o slow traffic wearing moto jeans with only 1 additional Nomex layer underneath:

A9zwSI3l.jpg
Click to expand...

I have come to the exact same conclusion as @double0 has with his 1199:

double0 said:
[...]
The oem frame heatsoaks like crazy and this is where majority of the heat is felt, inner thigh area
Solution? Change the frame to a carbon one. If this costs too much as a mod, then get the carbon frame covers which will also help.
Click to expand...

Also a lot of heat of the V4 engine is absorbed by the magnesium frontal subframe of a PV4S.
Exposing the rider's knees directly to very high temperatures since they are pressing directly against the visible silver/ black 'beams' of this subframe, on either side, right below the tank.

WKUiq7Ml.jpg

JNLGzr0l.jpg

The yellow box is the contact area of my knees getting blistered in their back cavities by the crazy hot visible 'beams' of the frontal subframe.
Here the heat is conducted through (too few) layers of garment when pressing my knees against the bike.

The blue box is the area of the back cylinder and back exhaust piping.
Here the radiating heat is convecting upwards, like a thermal, roasting my right upper leg (only) when trying to free itself from under the seat.

Therefore additionally to my triple layer clothing (incl. Nomex underwear), I also ordered the Carbon V4 Frame Covers (96981291AA):
zC4y9i0l.jpg


Would be nice if the thermal separation by the adhesive tape functioning as 'heat-decoupler' between the baking subframe 'beams' and the carbon covers, would achieve significantly lowered temperatures around my knee cavities. This way even enabling only moto jeans and Nomex underwear on hotter days? :)

Anyone who can confirm this for PV4?
 
The problem I have is heat to my left calf, which doesn't contact the frame at all. But. no doubt the frame gets hot. I was letting my bike warm up today and for ..... and giggles I brought out the IR thermometer. The left rear cylinder cover was maybe 70F. The frame right around the bolt and the bolt itself was 125-150F.

I think a better carbon fiber frame cover would be one that mounted with velcro and had the hole for the bolt covered. You could use that industrial velcro which would prob give you 1/8" or more between the cover and the frame for better insulation.

Of course, depending on how tall or short the rider is and their proportions will have a say in what part of their body contacts which parts on the bike.
 
Interesting thread. I live in Texas and the heat doesn't even register with me unless I'm sitting in traffic (which I try to avoid like the 'rona). Feel like I have a pretty leg intensive style of riding too (tank grips were the first "mod" I made). I guess different folks have different sensitivity.
 
Were you wearing leathers? Everytime I had a problem with the heat I was wearing riding jeans. Tomorrow will be my first ride in leathers since installing the slip-on.
 
bp_SFV4 said:
The problem I have is heat to my left calf, which doesn't contact the frame at all. But. no doubt the frame gets hot. I was letting my bike warm up today and for ..... and giggles I brought out the IR thermometer. The left rear cylinder cover was maybe 70F. The frame right around the bolt and the bolt itself was 125-150F.

I think a better carbon fiber frame cover would be one that mounted with velcro and had the hole for the bolt covered. You could use that industrial velcro which would prob give you 1/8" or more between the cover and the frame for better insulation.

Of course, depending on how tall or short the rider is and their proportions will have a say in what part of their body contacts which parts on the bike.
Click to expand...

Great iD to measure which a IR thermometer!
I will try the same with our Flir TG165. May be the added IR imaging will paint a clearer V4 heat-image?

Fully agree that different rider sizings relative to the same bike setup, could bring (slightly) different (heat) challenges.

Your left calf roasted instead? Interesting. How tall are you?
I'm 6' 1" (185cm) and calf areas are not at all an issue for me when it comes to heat. My calfs feel warm but nowhere close to causing heat-rash or -blisters.
Not even if I wear low-profile sneaker style moto boots, partly even exposing the lower part of my calfs.

You must be (much) taller a/o maybe position your feet differently on the pegs?
Where do you position your feet on the pegs? On the tip-, balls- or -duckstyle- your feet more mid-foot on the pegs?
Latter moves IMO also your calves more forward towards/ into 'blue' indicated hot area...

My wife also had her calfs roasted riding her M1100evo.
We remedied this effectively with long Nomex racing socks from AlpineStars.

Good idea to use thicker tape/ velcro as bonding material to widen the air-filled gap - functioning as insulator - between hot subframe and carbon covers.
This to achieve better thermal separation, theoretically lowering the temperature of heated carbon covers even more.
Tx
 
Last edited:
bp_SFV4 said:
Were you wearing leathers? Everytime I had a problem with the heat I was wearing riding jeans. Tomorrow will be my first ride in leathers since installing the slip-on.
Click to expand...

around 50% of the time leathers. I always wear track riding boots, which might help. When I take them off they are always pretty warm.
 

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