Heat and Performance comparison TT250 vs. RX3

Meloman · 06-17-2018, 08:23 PM

Though I recently bought a new TT250 and love it, I’m still intrigued by the RX3. I’m curious about the performance comparison in acceleration. The TT is lighter and geared lower so I would expext it to be faster, but the RX3 has more power and torque so in a 0-60 race they may be similar. I know there are a few of you out there who own both so I would appreciate your input.

Also, what about the roll on performance of each ?

The next question is about heat. The TT throws off a little heat on a hot day but it is not objectionable at all. But I’ve heard that the RX3 can roast you on a hot day. Is that accurate ?

Hawk 229cc · 06-17-2018, 08:32 PM

last ? i can answer, water cooled bikes seem to put of alot more heat is my experience ,then air cooled at 90 today my hawk was fine

dpl096 · 06-17-2018, 10:21 PM

Quote:

Originally Posted by Hawk 229cc

last ? i can answer, water cooled bikes seem to put of alot more heat is my experience ,then air cooled at 90 today my hawk was fine

I have to agree.... Seems ass backwards but liquid cooled motors seem, to me, to act like huge heaters.

timcosby · 06-17-2018, 11:12 PM

the water is taking the heat from the engine and putting it out into the air for you to feel

pete · 06-18-2018, 02:07 AM

the RX3 is air cooled...
stop the air flow and watch it over heat..

.

Megadan · 06-18-2018, 03:52 AM

Liquid cooled bikes seem to run "hotter" because they are able to be run with leaner fueling, higher compression, more aggressive timing, and so on due to the much higher transfer of thermal energy through water (roughly speaking 25 times greater than air).

Since they are much more stable thermally, they can be tuned much more aggressively without melting down or self destructing. The heat on the outside is a good thing.

Want to experience the thermonuclear heat of a liquid cooled bike, sit on any modern super sport or large sport touring bike (My VFR or the Hayabusa) where the engines are running 13:1 or higher compression, very aggressive timing, an capable of spinning very high RPM. Motorcross race bikes like the CRF450R are also on that same level of tune. Basically a race motor, with all of the race motor heat to go with it.

2LZ · 06-18-2018, 12:41 PM

Both the RX3 and the TT run "normally hot". I don't notice anything different between them and any other bikes I've owned. BUT....I do notice on both of our RX3s that you feel it more on your right knee or shin because of the air blowing through the right radiator. The left radiator is unnoticeable.

Performance, the TT has more bottom right off the throttle. It's that typical friendly CG motor power band. Like an old straight six.

Though overall more powerful, the stock RX3 is a bit pipey for my tastes. It kind of acts like a two stroke with half the power of the equal sized two stroke. The 300cc kit really helps the power band and makes it much more friendly. More "CG-ish".

Meloman · 06-18-2018, 01:14 PM

2LZ, thanks for the clear comparison. Now I know what to expect should I decide to venture into the RX3 world.

Hawk 229cc · 06-18-2018, 01:35 PM

yes so some run hotter then others bigger the engine more heat it is going to put off too,along with like Dan said compression ratio ,as well as where you live an how hot it is outside too,though some engines will run the same no matter the temp outside others like cooler temps,when up to operating temps ,will put out the same amount of heat ,at say 70 F or 50f temp will be the same ,you may not feel it is as much at 50,but they will all vary,take my 406 sbc with 3 core radiator on hotter days it uses a bit more coolant then it would on a 50f as the 70f day ,but thats from a bike engine the a car engine an high performance engines will allways run hotter ,

06-17-2018, 08:23 PM	#1
Meloman Join Date: Mar 2018 Location: Applegate, Oregon Posts: 101	Heat and Performance comparison TT250 vs. RX3 Though I recently bought a new TT250 and love it, I’m still intrigued by the RX3. I’m curious about the performance comparison in acceleration. The TT is lighter and geared lower so I would expext it to be faster, but the RX3 has more power and torque so in a 0-60 race they may be similar. I know there are a few of you out there who own both so I would appreciate your input. Also, what about the roll on performance of each ? The next question is about heat. The TT throws off a little heat on a hot day but it is not objectionable at all. But I’ve heard that the RX3 can roast you on a hot day. Is that accurate ?
	0

06-17-2018, 08:32 PM	#2
Hawk 229cc Join Date: Jun 2018 Posts: 214	last ? i can answer, water cooled bikes seem to put of alot more heat is my experience ,then air cooled at 90 today my hawk was fine __________________
	0

06-17-2018, 11:12 PM	#4
timcosby Join Date: Nov 2016 Location: robertsdale alabama usa Posts: 1,007	the water is taking the heat from the engine and putting it out into the air for you to feel __________________ 1991 harley heritage softail classic 2016 hawk kaw h1 400 tripple 13' long chopper in progress 2009 johnny pag bar hog 2004 hd electra glide ultra classic shriner edition 1997 harley davidson 1200 sportster 1972 harley davidson amf sx250
	2

06-18-2018, 02:07 AM	#5
pete Join Date: Jan 2012 Location: ChCh , NZ Posts: 2,261	the RX3 is air cooled... stop the air flow and watch it over heat.. . __________________ 09 XT660R ... 06 TTR250 ... 80 Montesa H6 125 Enduro... 77 Montesa Cota 348 MRR "Malcom Rathnell Replica"... Current resto projects.. 81 Honda CT110... 80 Kawasaki KL250A1... 11 Husaburg TE125 enduro... "sold" along with another 31... Lifan 125 Pitbike.. "stolen" ... KIWI BIKER FORUM...... http://www.kiwibiker.co.nz/forums/content.php All the best offroad rides in NZ... http://www.remotemoto.com/ E-mail... xtpete1@gmail.com
	1

06-18-2018, 03:52 AM	#6
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,016	Liquid cooled bikes seem to run "hotter" because they are able to be run with leaner fueling, higher compression, more aggressive timing, and so on due to the much higher transfer of thermal energy through water (roughly speaking 25 times greater than air). Since they are much more stable thermally, they can be tuned much more aggressively without melting down or self destructing. The heat on the outside is a good thing. Want to experience the thermonuclear heat of a liquid cooled bike, sit on any modern super sport or large sport touring bike (My VFR or the Hayabusa) where the engines are running 13:1 or higher compression, very aggressive timing, an capable of spinning very high RPM. Motorcross race bikes like the CRF450R are also on that same level of tune. Basically a race motor, with all of the race motor heat to go with it. __________________ Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124
	1

06-18-2018, 12:41 PM	#7
2LZ Join Date: Mar 2010 Location: Volcano, Ca Posts: 7,092	Both the RX3 and the TT run "normally hot". I don't notice anything different between them and any other bikes I've owned. BUT....I do notice on both of our RX3s that you feel it more on your right knee or shin because of the air blowing through the right radiator. The left radiator is unnoticeable. Performance, the TT has more bottom right off the throttle. It's that typical friendly CG motor power band. Like an old straight six. Though overall more powerful, the stock RX3 is a bit pipey for my tastes. It kind of acts like a two stroke with half the power of the equal sized two stroke. The 300cc kit really helps the power band and makes it much more friendly. More "CG-ish". __________________ "Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350
	0

06-18-2018, 01:14 PM	#8
Meloman Join Date: Mar 2018 Location: Applegate, Oregon Posts: 101	2LZ, thanks for the clear comparison. Now I know what to expect should I decide to venture into the RX3 world.
	0

06-18-2018, 01:35 PM	#9
Hawk 229cc Join Date: Jun 2018 Posts: 214	yes so some run hotter then others bigger the engine more heat it is going to put off too,along with like Dan said compression ratio ,as well as where you live an how hot it is outside too,though some engines will run the same no matter the temp outside others like cooler temps,when up to operating temps ,will put out the same amount of heat ,at say 70 F or 50f temp will be the same ,you may not feel it is as much at 50,but they will all vary,take my 406 sbc with 3 core radiator on hotter days it uses a bit more coolant then it would on a 50f as the 70f day ,but thats from a bike engine the a car engine an high performance engines will allways run hotter , __________________
	0