intercooler

[Lorenzo]

With temperature looking to the +26°C (78°F), and air getting consequently thinner in the sense of having less density in a given volume, with adverse effect on carburation, least one does not works on the jetting, an idea came to my mind:

what about devicing a sort of intercooler to cool the intake air so as to make it more dense?

This will have eventually to be done, without irreversible mods to the original layout;

does you think it might be feasible?

bike is the RG;

thanks

[Coyote]

HMmmmm. I have never changed jets due to the weather. Here the temps vary from minus 7 to +114F (17-44.5C) I admit I don't ride when it's much below 60. It's just cold to mess with it when there is a 4 wheeler available. Air temp. doesn't seem to affect these old slugs much. In racing yes. For street use why bother?

[Lorenzo]

To see what happens,

to learn something in the process...

cause people put shields between the bottom of the tank and the engine, for the petrol to run cooler, so why do them bother?

[Suzsmokeyallan]

Lorenzo do you have the carb updates from Rick Lance on your RG

[yeadon_m]

I have no idea how to but

<< To see what happens,

to learn something in the process...
>>

seem fine reasons for doing lots of things!

Enjoy,
Mike

[Lorenzo]

No Allan, alltough I immensely respect Rick Lance and his work, I am non a speed nutter, or one that must have the latest thing on his bike;

I like to go from A to B keeping a steady pace, but if I can device something to up the ante in my humble way, I go for it;

read my ensuing post on the keihin slide spring, and you'll get a better glance of the sort of things I like to get uo to....

yeadon_m like-minded people?

[yeadon_m]

Yes - I wanted to try fitting VM28 carbs from a 550...so I did. Very happy. No idea if dyno would say so, but its my bike
Mike

[Lorenzo]

And Allan (I m not sigling you out...)

who would have thought of injecting water into the pipes?

http://www.suzuki-rg500.com/water.htm" onclick="window.open(this.href);return false;

[Suzukidave]

Interesting Idea but how are you going to cool normal air temp air, inter coolers are used in super charged setups where the compressed air is much hotter that the surrounding air.

[Lorenzo]

good point; yet 40° air is still less dense than 10° one;

we all have experienced that feeling of the motor going stronger as much as carburation is concerned, after a shower in cool weather, the idea was to bring about the same atmosphere;

[Alan H]

Most diesel cars have intercoolers, but you can also inject a water mist into the intake to give a denser charge. (Works like a misty/foggy/rainy day without the rider discomfort.)
Used in high performance aircraft since before WW2.

[Lorenzo]

As a first step, before delveing into the actual phisical build of the intercooler itself, I was thinking of try and acquire the temperatures on the intake side;

I think an Arduino board and a TMP36 could do, plus a dot matrix board to visualize it;

I am not versed in electronics, but the point of it is to acquire knowledge, or viewed from another point, shed a bit of ignorance...

So any help/guidance is welcome;

thx

[tz375]

And Allan (I m not sigling you out...)

who would have thought of injecting water into the pipes?

http://www.suzuki-rg500.com/water.htm" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;

Water injection into a pipe is old technology that comes back every few decades. In this case, the idea is to cool the pipes to change the effective rev range. It's the opposite of retarding ignition after the peak to raise pipe temps to let the pipe resonate at higher revs as well.

Cooing the intake was common in WW2 on high performance supercharged motors to increase charge density. No reason not to try it on a two stroke but be ware that if air density increases much more that at STP that the bike was jetted for, it will run lean.

[Lorenzo]

actually that was something I thought from the outset, and it risks of becoming a catch-22 situation, unless you jet the bike so that it runs reach all the time (and is up to you to drive it consequently) but around perfect when the air is cooled (charge made denser), unless you fuel inject it..... but that is stretching it a bit too far (forward in time)

or device a sort of scoop that can let in as much air as you want and/or make the gizmo so that is on at a flick of a switch, but that's calling for an air flow sensor... am I thinking fuel-injection again...?

dunno yet

[Suzukidave]

About the spraying water into the intake to cool the charge , i dont know .. with all the mixture going down to the crank bearings that is one place i would like to keep water to a minimum . I think the bike manufactures have the best idea and thats to draw your intake air from ahead of the bike's engine where the air is coolest .