![]() | #3016 | |
BHPian Join Date: Jan 2014 Location: Kolkata
Posts: 446
Thanked: 421 Times
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At first I assumed it to be a one off so rode for another 40/50km duration before checking an hour back and it is same again :O Odo reads 150km right now . | |
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![]() | #3017 |
BHPian ![]() Join Date: Oct 2009 Location: NCR
Posts: 133
Thanked: 174 Times
| ![]() With the erratically high compression ratio the D390 utilizes, output is guaranteed in terms of BHP. Heat is just a bye product :-) What the engineers tried to do here is to just control the heat of the engine enough that it doesn't destroy the engine itself. I am yet to see a summer on my D390, but I assume that I will not see the overheating warning on my Duke. With the bare bones approach, the chosen radiator just prevents the bike from overheating. While doing 200+ kms non stop, my duke's temp gauge hovers at 60% to 75%. And the moment you stop or slow down, the gauge rises to above 80% And the moment you put your feet down, the fan starts to humm... I have tried waiting for ~ 2 min, but the fan would still be spinning in full blast. So gave up trying to wait till the bike cools off. And the most crucial thing to be noted is that the 390 was never intended to be a city commuter and that design philosophy is affecting all of us while navigating through the city. What I think is, the D390 is designed to heat up and we all will have to live with that. And its Otto Cycle which governs the gasoline engine, not Carnot. Remember, CAR...NOT. It can never power a car engine. Its a hypothetical engine.:-) |
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![]() | #3018 |
Senior - BHPian ![]() Join Date: Feb 2010 Location: Pune
Posts: 4,387
Thanked: 5,092 Times
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![]() | #3019 | |
Senior - BHPian ![]() | ![]() Quote:
BTW. 35psi for rear is a bit too much. | |
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![]() | #3020 |
BHPian ![]() | ![]() I've been reading the 390 thread for a while now and plan to pick one up in the near future. On the radiator topic, if you shut the engine down without the fan stopping, that means atleast for the next few minutes, the engine temperatures are going to rise. Hmm is this what leads to oil leak at the engine head, with the seal unable to take the heat generated? Ideally the radiator + fan combo should be able to cool down the engine enough so that the fan can shut off. If you keep it at idle, the fan might come on after a while depending on ambient temperature, load on engine etc. But then, thats ideal! Last edited by unni.ak : 22nd October 2014 at 12:45. |
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![]() | #3021 |
BHPian ![]() | ![]() When the Duke 390 was launched last year there was one concern people raised on possibly spending close to 20 k on replacement tires as they are soft compound. I know many folks who have moved on to Michelin or others when it was time to replace the tires. Wanted to know if there is anybody on forum who has changed the Metzlers with new set of Metzlers? What is the actual cost today since its more than 15+ months since the Duke is launched? Is the wear of tires really worry some? For me the tires are still looking strong. Its close to 1 year and 6500 kms and feel they will last atleast 5k more. And no I am not sedate while driving my Duke when I find open roads. |
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![]() | #3022 | |
BHPian Join Date: Jan 2014 Location: Kolkata
Posts: 446
Thanked: 421 Times
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Why do you feel the pressure is dropping by margins of 5/7 psi within 50km of running at sedate pace , there is no puncture either and as it stands , a pressure drop of that magnitude renders the bike useless for anything more than 20km round trips . 35psi was done by the pressure chap , i just let it be . Today I requested it to be brought down to 30 though ![]() | |
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![]() | #3023 |
BHPian Join Date: Oct 2014 Location: Bangalore
Posts: 273
Thanked: 303 Times
| ![]() I agree, we will get nothing. In the best case, we may get a simple answer from them saying that the concern is unfounded. Being an optimistic guy and if the issue is genuine, KTM may take it as a feedback... Of course, it may not happen as well unless a good number of customers raise their concern enough to be heard by them. |
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![]() | #3024 |
Senior - BHPian ![]() Join Date: Feb 2010 Location: Pune
Posts: 4,387
Thanked: 5,092 Times
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![]() | #3025 |
Senior - BHPian ![]() Join Date: Jan 2008 Location: Bangalore
Posts: 1,072
Thanked: 1,826 Times
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![]() | #3026 | ||
Senior - BHPian ![]() Join Date: Feb 2010 Location: Wellington
Posts: 2,539
Thanked: 2,937 Times
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I am really curious to know how the RC series hold up in places where temperatures go well above 40 degrees centigrade. In my city, summers are not anywhere as bad as what some other regions experience and the Duke still runs super hot. Quote:
In most cases, Yes. The quality of the beading is important as well. | ||
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![]() | #3027 | |
BHPian Join Date: Oct 2014 Location: Bangalore
Posts: 273
Thanked: 303 Times
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![]() I am more concerned about switching off the engine suddenly which in turn leads to some damage. | |
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![]() | #3028 | ||||
BHPian ![]() | ![]() Quote:
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It could be that the actual surface temperature of the CBR cyclinder head may be same as that of Duke's. Say for e.g. 90 deg C. However the fairing, direction of cooling airflow etc makes one feel duke is hot in operation. Mainly becasue of the hot air flowing towards your legs. | ||||
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![]() | #3029 | ||
Senior - BHPian ![]() | ![]() Quote:
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Its the same case with superbikes. In the cross-plane R1 (2010 IIRC) I have once tried, there is a realtime temperature readout instead of the traditional bar-stuff. The engine warms up and idles at around 60-65deg C. And once after riding it in moderate traffic, my friend switched it off the moment we came to a halt. We decided to move after a couple of minutes, and when he switched the ignition on, the temperature was at 107deg C and the engine plainly refused to start with MIL on and the fan continuously running. And we had to wait for a whole 5 or 10 minutes until it came down to 104 or 102 deg C before he could crank it! | ||
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![]() | #3030 |
Senior - BHPian ![]() Join Date: Feb 2010 Location: Wellington
Posts: 2,539
Thanked: 2,937 Times
| ![]() I don't wait at all. Conditions are such that when I reach my house, the fan isn't spinning, I have not been riding fast or keeping high engine speeds, I am still down by two bars on the first segment and I know for sure I am not re cranking for a while. Yes; the temperature will rise after engine shut down but I've noticed that letting the radiator fan kick in does not improve the situation. Once the fan comes on, it never goes off on a very hot engine. The engine shut down process is situation based for me. If I am belting down a highway and decide to do a sudden pit stop, I idle the engine a bit. If its a planned stop, I don't. I find the trigger for the radiator fan a little too aggressive. You stop at a long traffic light. I keep the engine idling. Fan starts up and keeps running. Traffic light turns green, I start moving at a speed of no more than 20-30kmph considering I am in the thick of traffic inching slowly to cross the signal. In this short time I have started to move, the radiator fan turns off, possibly instruction from the ecu that the bike has started moving and natural air flow can take care of cooling. Not good. Its taking place too soon. Temperature starts rising, fan restarts. Last edited by sandeepmohan : 22nd October 2014 at 17:02. |
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