| Author | Message | ||
     Panshovevo |
I think most probably know that an engine will perform better with cool fuel than hot, and I read of people taking steps like insulating the header pipes and frame/fuel tank to reduce the heat transfer. I know some drag racers who circulate their fuel through an ice packed cooler between runs when it's hot. I've seen a dramatic difference in how my 1125CR runs before and after a fillup on a hot day, after riding in traffic. One of these days, I'm going to remember to take an infrared temp gun with me, and measure the temp of the outside of the fuel tank before and after filling it. Has anyone ever tried any sort of cooler for the fuel? Safety would be a concern, of course... | ||
| Hybridmomentspass |
What drag racers are cooling their fuel? I ask cause Ive never seen it at any race (speaking of bikes here) | ||
| Panshovevo |
Couple of local guys who run 124 Challenge bikes | ||
| Hybridmomentspass |
Odd, Ive wrenched on 124 challenge bikes before and never seen anyone at an AHDRA event do this. Might be snake oil | ||
| Dannybuell |
that is an old 60's drag racing trick. a large coffee can a coiled fuel line and some dry ice... Gawd I'm old! How did that happen? | ||
| Fresnobuell |
There must be something to it. Those insulated covers for the fuel tanks aren't uncommon on the racing grids. | ||
| Stirz007 |
Most motorcycle road racing rules stipulate how cold fuel can be when the tank is filled and prohibit on-bike chiller systems - cooler fuel is more dense. On a SBK/Moto GP bike, it's often a fuel capacity issue - you can get more fuel in the tank if it's cold. You will see insulated tank covers at pre-grid sometimes, especially on a hot day. Not familiar with drag rules, though. Danny - I remember that too - dirt trackers also did it.... | ||
| Panshovevo |
Chris Sansevere of Holeshot Racing is the first one who told me about it in recent years. I'm pretty sure I had heard about it in my younger wannabe drag racer days (early/mid '70's) when I was spending every paycheck repairing the '68 Camaro I was breaking most every weekend street racing... Cold fuel is, as stated above, more dense, and contains more BTUs per volume. It also cools the intake charge better, allowing more complete cylinder charge, and higher compression motors to have a bit more of a detonation safety margin on hot days. | ||
| Duanelr |
I'm going to be the contrarian and say I don't agree that there is an appreciable difference with our street bikes. (Difference between warm/hot gasoline and cool gasoline) Relying on seat-of-the-butt-dyno testing is inaccurate, open to interpretation, and anecdotal. Fsck that, put it on a dyno. My assertion is the bike runs fine when hot. My anecdote. It was 100 degrees in Portland yesterday, I'm riding in the city, fuel light was on, and gas was still coming coming out of the vent tube on the swing arm. It was uncomfortable and the bike ran fine, nay, great. (There's so much tweaking to the 5th decimal-place on this site) (Message edited by duanelr on June 26, 2015) | ||
| Panshovevo |
Good Lord... | ||
| Hybridmomentspass |
Chris is a great racer I still dont see it being a huge benefit Or maybe it is and most everyone has failed to adopt it because they are dumb. Just seems like people would have seen the benefits in it over the past 50 years if it really worked. When you run a class like 124, where rules are really tight, you'd try many things to gain an advantage over the others etc Like I said, never seen it. No nitro guys do it No PSM guys do it in NHRA etc | ||
| Panshovevo |
Is it going to give a guy a half second advantage over everyone else? No. Does it make enough of a difference to be worth the hassle? Some think so, obviously some don't. I suspect there might be more people doing it (running chilled fuel) than are obvious from a stroll through the pits. I did some reading on the subject the other night, and according to one source, nitro and methane fueled motors supposedly benefit the most from it. As far as the comment above about the butt dyno not being adequate proof (then complaining about too much going to the 5th decimal place...contradictory to me) when the bike is running rough, choppy, and generally acting unhappy when I pull in to the gas station, then running smoothly like a different motor when I pull out a couple minutes later, it doesn't take a dyno to quantify that. Incidentally, I let Chris take my 1125CR for a ride shortly after I bought it. He came back to the shop a while later, and said "Damn that's fun! I'm going to have to get me one of those." Between his tuning capabilities and engine mod and building experience. I'll bet that if he gets one and starts playing with it, it will be a screamer. |
