WILL THIS ENHANCE PERFORMANCE?

[Bob Miller]

I was curious because last year after doing some testing I noticed that my Warrior runs better when it is cooler After the season was over I added a TEMPERATURE gauge so this winter I could more closely monitor it!
If a valve was added to shut off the coolant to the carb manifold on those warmer days above 0 degrees, would it help performance?

 

[LazyBastard]

Not likely and certainly not measurably. The big performance changer that comes with temperature is AIR temperature - colder air is more dense, therefore more goes into the engine, therefore you get more power. Also with temperature you get different SNOW conditions (this is the REALLY big one)- warmer snow is stickier, therefore SLOWER.

The amount of heat that will be absorbed by the air going through your carbs is totally insignificant. The heat in the carbs can have some slight effect on fuel going through - again, cold gas is dense gas, but this would just cause your engine to run more rich, BUT, not nearly as much more rich than what the colder air would DEMAND (which means NO DIFFERENCE).

What a coolant shutoff valve will do is make warm starting easier - the gas in a hot carb will expand and push up your jets, causing your engine to slightly flood, which is why you need to crack the throttle to start it when its WARM.

 

[yamahajunkie]

already have done it to my 05 warrior, i think it will, from what i have read on this forum

 

[yamahajunkie]

boy sounds like it will just start better bob. i should have waited a minute or 2. Posted: Thu Oct 07, 2004 1:28 am Post subject: lb

 

[Bob Miller]

I posted this once before.
One day in January in Canada I was staying at REAL MASSE and I was out all day riding, the sled was warmed up ! It was about 15 degrees at the time. I got out on the lake (it's 1/2 mile run) and I let the Warrior rip
I did about several runs and I saw 104 on the speedo.
So I tried something :shock: I rode into some deep snow and rode around in it and let the heat exchangers feel that nice cool snow.
I then got back out onto the lake and nailed it I then saw 112 on the speedo.
It was a coool experience!!!!!

 

[Mighty]

I rode into some deep snow and rode around in it and let the heat exchangers feel that nice cool snow.
I then got back out onto the lake and nailed it I then saw 112 on the speedo.
It was a coool experience!!!!!

I would put more stock in the fact that your hyfax got colder too.

 

[yamahajunkie]

still a little easy mod, that will help your sled start better when warm. time and thoughts spent on the sled, than in the bar.

 

[LazyBastard]

For that speed change; as mighty said, the sliders are the big thing for fresh snow - they were probably melting and sticky before the snow. Asides from that, you may have changed the overall ENGINE temperature.

Lots of time when running in marginal snow conditions, its necessary to find patches of snow to drive through in order to keep moving. You can tell if its your sliders by slowing down - if it slows down unusually fast, it means that you've got some extra resistance in the back. If you kept running in the marginal snow conditions, you would have noticed your speed gradually drop as your sliders started to melt again.

 

[Bob Miller]

That day the snow conditions where good on the lake! I believe it had something to do with engine, coolant temperature.

 

[RX1 Yooper]

Lazy bastard,
What you said makes sense. One question I have is how can the gas push up the jets, if the float bowls are vented?

I agree with your answer, but can remember all the SRX and Viper owners recommending turning the heaters off, for better performance in warm weather. Were they wrong?

 

[wolfie]

I always thought the SRX's ran crisper in warmer weather when the heaters were off. By the same token, they're awesome in cold temps and pushing deep snow for keeping the carbs from icing.