| Author | Message | ||
     Peter_nikols |
Hi all, It's been a real scorcher these days as many of you know. I have taken the 1125R out a few times for a ride and each time I have noticed that it is really sluggish. At first I thought there was something wrong and I had to stop the bike because it felt like it didn't want to accelerate from low rpm when I gave it gas. After a couple minutes I got back on and rode around it seemed to react much better once I got into the mountains and the cooler air hit it. It happened again the other day. It just felt like it didn't want to go. It seems to run better at higher rpm but not great. I thought it might be cheap gas or condensation. So I put some fresh gas and no difference. This bike really doesn't like the heat. Are any of you feeling this. | ||
| Ccryder |
Heck mine runs better in 90+deg temps! | ||
| Dannybuell |
We have 10% ethanol in the gas around here. Do you think that may be a part of it? | ||
| Easyrider |
Peter, The software is programmed to lean out, the hotter it gets, so the only way to solve this is with a very good tune of your setup, it should indeed be the hotter it gets the better it runs | ||
| Azxb9r |
Engines like to breath cooler air. The hotter the intake air gets, the less dense it becomes. I am not sure what you are calling a scorcher, but my bike does not run as well when the temp. climbs over 105... neither does my car. If you want to do anything about it, you will need to cool the air entering the engine. | ||
| Mountainstorm |
I've put on several hundred miles lately in the 100F heat. No problems here. Tires seem to hook up even better so I am riding those twisties with even more confidence. | ||
| Ratgin |
Its been around 35C (95f) and very high humidity in Ottawa/Montreal for around 5 days, Peter, rain (severe tstorms) heading your way but the good news is temps dropped a little bit, I dont know if humidity has any impact on bike but with humidity factored its its been 108f here for a week. Heres a pic on how hot.  | ||
| Oddball |
Now That's Chill'n! | ||
| Peter_nikols |
Hi all, I'm in Montreal so like Ratgin said it's 95 degrees here, in the shade. The bike feels like it doesn't want to accelerate. When I'm between 3000 and 4000 rpm and I give it gas, it doesn't respond crisply. It's real sluggish and does nothing until I've reached the a certain throttle position where it just kicks in. It really feels like it's not getting enough gas or air or something. But once I get past that point and I'm at 6000, it seems more normal. | ||
| Randy_bowers |
95 here and road about 200 mi and no prob. | ||
| Blk09r |
Like Azxb9r said, engines like cool air. Cool air is denser and contains more oxygen for a given volume than warmer air. Engines also like cool fuel. I know my frame is too hot to touch after riding for a while on a real hot day so the fuel is hot as well. We know this from all of the fuel boiling threads. I would think this could cause power loss as well. I wounder if it would be worthwhile running the fuel line to a small cooler, maybe like an oil cooler, to get the fuel closer to ambient before it gets to the injectors. | ||
| Bextreme04 |
well... actually hot fuel is better. Engines like cooler air because it is denser and therefore there is more of it for a certain volume but hotter fuel atomizes better, burns more efficiently, and generally is less likely to detonate, that's why you will never see a fuel cooler or anyone really caring about how hot it gets(unless you have to sit on the fuel tank like us) | ||
| Blk09r |
Pulled this from another web site..... "Race Car Engineering and Mechanics" by Paul Valkenburg , in the section about building airboxes and ram air inlets for the motor. Cold cans which cool fuel were used extensively in drag racing and made it's way into other forms of racing in the 70's and were outlawed. There is a significant advantage to cooling fuel right up to the point were the intakes ice and the fuel turns solid. I have seen on engine dynos the increase in horsepower with cooler fuel but the numbers were closer to 5 degs (f) for 1 horsepower, interesting though was the increase when gas temp got below 50 deg. The climb was steeper!!! I remember a few drag racer friends who used to run cool cans back in the 80s. It was basically a coffee can full of ice with the fuel line coiled through it. | ||
| Stirz007 |
Blk is right. (liquid) Gasoline will expand when heated, right up to vapor point. Ya ever notice how the Buells piss gas when they are hot? It's not because the gas volume decreased.... Same idea as cooling the air works with fuel. Cool fuel = higher density per unit volume. So, for a given A/F mixture (jet, throttle setting, whatever), chilled gasoline will give a higher fuel density than hot gasoline. Hot gas (especially near the vapor point) will certainly volatilize faster, but cold gas works just fine when it leaves the atomizer and hits that hot manifold. | ||
| Kenm123t |
Basic your cooling the fuel below its subcooling point its acing like a refrigerant lowering air temp and lowering Density altitude. Checkout any Cessna Piper etc piston engine performance chart on density altitude performance Hot = Hi = lower hp | ||
| Dannybuell |
Don't you mean Dry Ice? | ||
| Ratbuell |
Have you checked codes? Watched your coolant temp? My CR runs awesome in the heat (all the damned time, actually...I can't make it miss a beat). But that's not to say you might not have a sensor that's wigging out in the heat, causing something to go out of sync. I also see you have an '08 - what flash are you running? 1125s have onboard diagnostics, and some great IP displays. Use them. |
