Liquid cooled heads - Really cooler ride??
Road Warrior
Joined: May 2012
Posts: 1,570
Likes: 117
From: Southeast NC
the heat is coming from the cat. thats what a cat does. build intense heat to burn fumes. i believe the pseudo water cooling is a waste and a joke. Harleys have run air cooled for decades and decades. id buy the ultra if it were me. although you do get some nice extra options with the limited. just my 2 cents on the water cooled heads. the v rod has true water cooling. the guys with the limiteds are going to have biased opinions imo and im not belittling they're expensive purchase because they are nice bikes but the water cooled heads are just not real water cooling and simply a waste. most of Harleys line up are air cooled bikes with no issues what so ever.
Road Warrior
Joined: Aug 2014
Posts: 1,937
Likes: 320
From: Vancouver, WA
the heat is coming from the cat. thats what a cat does. build intense heat to burn fumes. i believe the pseudo water cooling is a waste and a joke. Harleys have run air cooled for decades and decades. id buy the ultra if it were me. although you do get some nice extra options with the limited. just my 2 cents on the water cooled heads. the v rod has true water cooling. the guys with the limiteds are going to have biased opinions imo and im not belittling they're expensive purchase because they are nice bikes but the water cooled heads are just not real water cooling and simply a waste. most of Harleys line up are air cooled bikes with no issues what so ever.
Last edited by RG Pilot; Aug 11, 2015 at 07:04 AM.
Road Master
Joined: May 2010
Posts: 816
Likes: 57
From: Rijssen, the Netherlands
Cooler? Yes, for sure and not only a little bit. We live and work in Saudi Arabia, one of the hottest places on earth. In winter the temps on the day will exceed 95F and in summer, like now, easlily 115 or even 118F. Still we ride, in the early morning when the temp is not exceeding 105F. We had before a 2003 Softail, a 2010 Ultra and now a 2015 Limited. The differences are undescribable. I needed an oil cooler on both my Heritage as my Ultra as well. Despite the oilcoolers (JAGG with electric fan) the oil temps exceed easily the 260F. With my Limited never 248-250F. The heat exposed to the private parts whas unbearable on my Heritage as my Ultra as well. Here, under these extreme conditions, never with my 2015 Limited.. We can compare of THREE bikes, including the 2015 Limited, twin-cooled...Great invention of Harley !
Road Master
Joined: May 2010
Posts: 816
Likes: 57
From: Rijssen, the Netherlands
Wrong, the Project Rushmore developments are not only cooling the exhaust ports and manifolds but the entire cylinder head as well.
The main reason for this is not the cooler engine but avoiding emissions to the air. Nitro-based harmfull emissions are created by high temperatures of exhaust gases and high temperatures of combustion chambers as well. Cooling them down within 0.2 second to below 900C will prevent the forming of nitro based emissions. Liquid cooled exhaustsmanifolds and cylinderheads can only provide that. Not aircooled anymore. The cooler engine for the rider is a second advantage, caused by this 'triplex cooling'. Because obviously, the Project Rushmore engines are not fully watercooled but aircooled and oilcooled as wel. But the watercooling absorbs a lot of the heat otherwise being transferred to the oil and air in fully "aircooled" engines of HD.
The main reason for this is not the cooler engine but avoiding emissions to the air. Nitro-based harmfull emissions are created by high temperatures of exhaust gases and high temperatures of combustion chambers as well. Cooling them down within 0.2 second to below 900C will prevent the forming of nitro based emissions. Liquid cooled exhaustsmanifolds and cylinderheads can only provide that. Not aircooled anymore. The cooler engine for the rider is a second advantage, caused by this 'triplex cooling'. Because obviously, the Project Rushmore engines are not fully watercooled but aircooled and oilcooled as wel. But the watercooling absorbs a lot of the heat otherwise being transferred to the oil and air in fully "aircooled" engines of HD.
Road Master
Joined: Mar 2007
Posts: 872
Likes: 237
From: Covington, Ga
Now there's a guy that knows what he's talking about.. NOT! He says the guys with water cooled bikes have biased opinions and are justifying their expensive purchases for something that is pointless...but, he's not biased towards straight air cooled bikes like his now is he. That's a good one. I never heard the MoCo claim that the twin cooled motor is a "true water cooled" engine. It isn't. It has water cooled exhaust ports. The HO engines have slightly higher compression which in turn delivers a bit more power. Power causes heat. The heat is deflected away from the rider AND the engine itself. The system works. We will be seeing more water cooling as time progresses too. At cruising speed, there really is no difference but in stop and go, slow speeds, there is an noticeable reduction in the amount of heat that is felt by the rider.
Yes, what he said.
Road Warrior
Joined: May 2010
Posts: 1,348
Likes: 52
From: Central Illinois
This is the part I can never seem to understand. If the air cooled bike is 260/280F and the twin cooled is 248/250F, is it really that much of a difference that I can feel? My 2010 doesn't go over 245F now and it is still hot, particularly on the passengers right foot and leg.
Cooler? Yes, for sure and not only a little bit. We live and work in Saudi Arabia, one of the hottest places on earth. In winter the temps on the day will exceed 95F and in summer, like now, easlily 115 or even 118F. Still we ride, in the early morning when the temp is not exceeding 105F. We had before a 2003 Softail, a 2010 Ultra and now a 2015 Limited. The differences are undescribable. I needed an oil cooler on both my Heritage as my Ultra as well. Despite the oilcoolers (JAGG with electric fan) the oil temps exceed easily the 260F. With my Limited never 248-250F. The heat exposed to the private parts whas unbearable on my Heritage as my Ultra as well. Here, under these extreme conditions, never with my 2015 Limited.. We can compare of THREE bikes, including the 2015 Limited, twin-cooled...Great invention of Harley !
Road Master
Joined: Apr 2008
Posts: 1,012
Likes: 285
From: Alva Florida
I own a 2010 CVO Ultra....Rinehart True duals, TTS Master Tune. I also own a 2010 CVO Street Glide. Fulsac RX Headpipe, Crusher slipons TTS Master Tune. Both Tuned by the same person Doc's Performance in Clermont.
IMO....under 80 degrees its a push either is fine around 85 degrees the twin cooled Street Glide, I seem to feel more heat. Both bikes run lowers, but the hot air coming out of the radiators blowing on your legs adds to the over all heat. Plus the vents on the lowers on the 2015 SG are not near the size of the vents on the 2010 Ultra which prevents air flow down the side of the motor that helps cool your legs. I rode the Ultra 2 up to Key West in July, 5 1/2 hrs one way. It was warm....but not uncomfortable. Rode the SG solo to my tuner in Clermont....3.5 hrs one way left early in the morning with temps in 80's. Bike was stock going up heat really wasn't a problem. Coming back had the DX headpipe and crusher slipons with a tts tune. Temps were near 100 degrees when we left Docs. Bike still felt hotter than my Ultra.
Unscientific at best just my opinion, never measured the temps with an Ir gun, just my feeling. Twin cooled bikes don't have oil coolers, so not sure which has higher oil temps, saw the post above not sure its apples to apples unless they added an oil cooler to the 2015 bike.
IMO....under 80 degrees its a push either is fine around 85 degrees the twin cooled Street Glide, I seem to feel more heat. Both bikes run lowers, but the hot air coming out of the radiators blowing on your legs adds to the over all heat. Plus the vents on the lowers on the 2015 SG are not near the size of the vents on the 2010 Ultra which prevents air flow down the side of the motor that helps cool your legs. I rode the Ultra 2 up to Key West in July, 5 1/2 hrs one way. It was warm....but not uncomfortable. Rode the SG solo to my tuner in Clermont....3.5 hrs one way left early in the morning with temps in 80's. Bike was stock going up heat really wasn't a problem. Coming back had the DX headpipe and crusher slipons with a tts tune. Temps were near 100 degrees when we left Docs. Bike still felt hotter than my Ultra.
Unscientific at best just my opinion, never measured the temps with an Ir gun, just my feeling. Twin cooled bikes don't have oil coolers, so not sure which has higher oil temps, saw the post above not sure its apples to apples unless they added an oil cooler to the 2015 bike.
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