weven Posted April 2, 2015 Share Posted April 2, 2015 I have just replaced my rear shock. http://www.fgspecialparts.it/en/product_details.asp?maker=FG&code=H0M062FQEECO&model=HONDA%20VFR%201200%20F&year=2013&product= I have been adjusting it while on road and have been surprised at the heat. Surely this would not be helping the performance???? The exhaust is so close and the shock gets to hot to touch? Need a heat shield maybe.. Any thoughts ???????????? Link to comment Share on other sites More sharing options...
Member Contributer Rush2112 Posted April 2, 2015 Member Contributer Share Posted April 2, 2015 The physical interaction of the oil forced through the valves inside the shock as it goes through its motions generates a lot of heat... more heat than that which occurs from heat soak from the exhausts. This was how it was explained to me by a suspension guru... Link to comment Share on other sites More sharing options...
Hawkeye Driver Posted April 3, 2015 Share Posted April 3, 2015 The physical interaction of the oil forced through the valves inside the shock as it goes through its motions generates a lot of heat... more heat than that which occurs from heat soak from the exhausts. This was how it was explained to me by a suspension guru... Yep, the kinetic energy of the suspension compressing is turned into heat. Not to worry, hydraulic fluid (shock oil) tolerates heat very well, as opposed to other fluids like water. Really boils down to what temp the fluid boils (pun intended). As an example, the airplane I fly uses hydraulics to power the flight controls, landing gear, wing fold, brakes, other systems...and my favorite the windshield wipers (late 1950s design). Every now and then when using the wipers a hyd line will rupture in the cockpit. Nothing like having scalding hot hyd fluid spewing all over the co-pilots boots. The fluid gets hot from passing through the engine driven pumps plus moving all the actuators. Link to comment Share on other sites More sharing options...
weven Posted April 3, 2015 Author Share Posted April 3, 2015 Yes point taken, though that shock is getting really dam hot. I have had the experience of shock absorbers fading out on a Four Wheel Drive (SUV) and it would bottom out big time, and they did not seem to be as hot!! Maybe I will try some exhaust wrap in that area when I remove the exhaust for a Decat. Link to comment Share on other sites More sharing options...
Member Contributer Rush2112 Posted April 3, 2015 Member Contributer Share Posted April 3, 2015 All of our V4 bikes have shocks near the rear exhaust down pipes... you got a new shock that is probably dampening better than the stock shock and this generates a lot of heat... way more than the heat soak from the exhaust pipes. Wrapping the the pipes will help retain heat in the pipes and help keep the under seat heat down but I believe your shock will still get hot when ridden enthusiastically... Are you adjusting the dampening too high and generating extra heat from the friction? Link to comment Share on other sites More sharing options...
satariel Posted April 3, 2015 Share Posted April 3, 2015 VFR 1200 has a few heat shields preventing the rear shock from heat - never ever noticed my rear shock to be hot - warm a bit but at most. Plus the shock is inside the swingam and the rear headers are outside on the right side. Not sure whats going on with your setup but this is more likely shock related problem. Link to comment Share on other sites More sharing options...
weven Posted April 3, 2015 Author Share Posted April 3, 2015 Well I must say I was backing of the dampening when I noticed it, was probably a bit tight. I had just ridden fairly enthusiastically over 80ks of terrible roads. I will check next ride. Link to comment Share on other sites More sharing options...
Member Contributer Mohawk Posted April 3, 2015 Member Contributer Share Posted April 3, 2015 The main is right, it's the exhaust heat. My 5th gen used to get very hot & get a bit soft in the rear. I made a double skin thin alloy heat shield & even when riding some gorges in Spain last year in 30c heat the shock never got to hot to touch & the damping stayed good. The shield is covered in one of my refresh threads. Link to comment Share on other sites More sharing options...
weven Posted April 3, 2015 Author Share Posted April 3, 2015 M I have to agree. Have been for a short ride on the Highway quite smooth and the shock was really hot, (32deg C) no way I could hold my hand on it. Honda has two heat shields on the exhaust so they knew it was an issue. Will see what I can do over the existing shields, experimental you understand. Link to comment Share on other sites More sharing options...
Member Contributer Rush2112 Posted April 3, 2015 Member Contributer Share Posted April 3, 2015 I have ceramic coated headers wrapped in exhaust wrap sealed with high temp silicone paint and I can put my hand right next to the headers without burning... the shock still gets pretty warm just from the action of the shock and the oil forced through the valves. Link to comment Share on other sites More sharing options...
satariel Posted April 3, 2015 Share Posted April 3, 2015 I have ceramic coated headers wrapped in exhaust wrap sealed with high temp silicone paint and I can put my hand right next to the headers without burning... the shock still gets pretty warm As I've posted before - the heat is more likely produced by shock itself. Since he has aftermarket shock i would contact the supplier and ask for a normal operating temp range. Link to comment Share on other sites More sharing options...
DaveVXR8 Posted April 4, 2015 Share Posted April 4, 2015 I just got back from a very intense ride on my VFR12, soon as i got grabbed the shock, it was hit, but not so hot that i couldnt keep hold of it. Same with the swingarm... Link to comment Share on other sites More sharing options...
12bravo Posted April 4, 2015 Share Posted April 4, 2015 I have just replaced my rear shock. http://www.fgspecialparts.it/en/product_details.asp?maker=FG&code=H0M062FQEECO&model=HONDA%20VFR%201200%20F&year=2013&product= I have been adjusting it while on road and have been surprised at the heat. Surely this would not be helping the performance???? The exhaust is so close and the shock gets to hot to touch? Need a heat shield maybe.. Any thoughts ???????????? Sure, there's dirt bike shock bags that could go on there with a velcro wrap, or fab something yourself from there... Scientific: get a laser thermom. and record some readings. Ask the manufacturer yet? Way to check the oil? Link to comment Share on other sites More sharing options...
weven Posted April 5, 2015 Author Share Posted April 5, 2015 Dave that’s good to know. I have emailed the supplier not had a reply yet. I really think it was the extremely bad road plus the temp on the day 34c (93F) that made it so hot to the touch. I found some old exhaust rapping that has been lying around the workshop for 8 years, so not in great condition but good enough for a try, stuck some wire through it for a real temporary cover and went for a blast. Noticeable drop in heat. So I’m happy now. Link to comment Share on other sites More sharing options...
CandyRedRC46 Posted April 5, 2015 Share Posted April 5, 2015 Here is an easy way to confirm you guys theories, let the bike run for a while but don't ride it. See how hot the shock gets from external exhaust heating alone, versus internal friction heating plus the external exhaust/engine heat. Link to comment Share on other sites More sharing options...
Member Contributer Dutchy Posted April 5, 2015 Member Contributer Share Posted April 5, 2015 Back in the 90's, Suzuki put a "rotation" rear shock on the TL1000S. From what I recall as what was said at the time, it was not a success due to (over)heat. Link to comment Share on other sites More sharing options...
Member Contributer Mohawk Posted April 5, 2015 Member Contributer Share Posted April 5, 2015 Then park it at the top of a big hill & freewheel down, check the temp of shock at top & bottom :) Link to comment Share on other sites More sharing options...
DaveVXR8 Posted April 5, 2015 Share Posted April 5, 2015 I agree, your natural heat across the pond probably doesnt help. When i gave her a thrashing yesterday it was on 10 centigrade here in sunny (joke) England... Link to comment Share on other sites More sharing options...
satariel Posted April 5, 2015 Share Posted April 5, 2015 Back in the 90's, Suzuki put a "rotation" rear shock on the TL1000S. From what I recall as what was said at the time, it was not a success due to (over)heat. Great bike with some stupid ideas - of course R model. Good read appeared some time ago: http://www.bikerchris.co.uk/tlzone/Practica_Sportsbikes_Rotary_Damper_Info_Nov_2013.pdf Link to comment Share on other sites More sharing options...
Member Contributer Rush2112 Posted April 5, 2015 Member Contributer Share Posted April 5, 2015 Here is an easy way to confirm you guys theories, let the bike run for a while but don't ride it. See how hot the shock gets from external friction heating alone, versus internal heating plus the external exhaust/engine heat. Not quite the same air flow and heat exchange... but I see what you're getting at Then park it at the top of a big hill & freewheel down, check the temp of shock at top & bottom :) Good idea... although, wouldn't replicate the heat generated from dampening during acceleration... I agree, your natural heat across the pond probably doesnt help. When i gave her a thrashing yesterday it was on 10 centigrade here in sunny (joke) England... I think the OP is across a couple of ponds from you... they're in OZ Yay! I figured out how to multi-quote :D Link to comment Share on other sites More sharing options...
satariel Posted April 5, 2015 Share Posted April 5, 2015 The race type shocks(as it seems what he have) runs with a bit higher temp spec - I recommended asking the supplier for the normal operating temp range...no reaction... First ask the supplier - then grab the pyrometer and check how hot are you running. Link to comment Share on other sites More sharing options...
lshark Posted April 5, 2015 Share Posted April 5, 2015 i just rode about 100 miles at around 55-60 F.....shock was just barely warm to the touch...but i know my bike does get hot down there in the summer...there is another post about this but to save you searching here's a pic of how i vented my Ohlins remote bracket Link to comment Share on other sites More sharing options...
weven Posted April 7, 2015 Author Share Posted April 7, 2015 I agree, your natural heat across the pond probably doesnt help. When i gave her a thrashing yesterday it was on 10 centigrade here in sunny (joke) England... Ha ha, Dave I kid you not, the heat that comes off the Black Top on the 35+ C days here is unbelievable. I recall a ride with the Wife on the back a couple of years ago at 43+ C the Black Top was melting, scary saving the front sliding on melting bitumen…. Link to comment Share on other sites More sharing options...
DaveVXR8 Posted April 10, 2015 Share Posted April 10, 2015 I rememver being in Miami a few years ago and thinking yeah it'll be fine to go across the road barefoot and use my mates pool.... It was like treading on lava! Link to comment Share on other sites More sharing options...
weven Posted April 10, 2015 Author Share Posted April 10, 2015 Miami City in Florida USA. Miami City in Queensland Australia ?? Link to comment Share on other sites More sharing options...
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