Chilled fuel and air

Jon Connolly · Post by **Jon Connolly** » Tue Feb 22, 11 9:52 pm

http://www.designengineering.com/conten ... more-power

Anyone else using refrigeration ?????????????????????????????

dustymopar · Post by **dustymopar** » Wed Feb 23, 11 2:03 pm

Errr, you?

Would problems be encountered for normally aspirated vehicles for street use? Wouldn't chilled intake air make alterations to engine tune necessary assming that you wouldnt use this continuously?

Jon Connolly · Post by **Jon Connolly** » Wed Feb 23, 11 3:38 pm

Hi Dusty

No good for road use due to the generation issues ... but definately has a use in drag racing

Did a cold fuel vs warm fuel test on the dyno with Billadeau. It made no difference at all to peak hp. Looked again weeks later at the dyno sheets and the big differences are torque and volumetric efficiency. The engine hits 100% VE ( or over ) sooner and for a longer period.

Took a bit of working out but I am now CONVINCED ... I also think it carries nitrous better ( i.e. further )

I am using a co2 cooler later this year. If you use one be sure to buy R744 and not general welding or dispense co2

dustymopar · Post by **dustymopar** » Wed Feb 23, 11 3:45 pm

Jon Connolly wrote:If you use one be sure to buy R744 and not general welding or dispense co2

Why is that

Jon Connolly · Post by **Jon Connolly** » Wed Feb 23, 11 3:51 pm

Moisture content, or lack off, won`t block the outlet orifice with ice

dustymopar · Post by **dustymopar** » Wed Feb 23, 11 4:12 pm

R744 isn't a CFC is it? Weren't that used for low-temp ref?

Jon Connolly · Post by **Jon Connolly** » Wed Feb 23, 11 4:19 pm

No .. it`s a natural 0% odp so do what you want with it

dustymopar · Post by **dustymopar** » Wed Feb 23, 11 4:34 pm

Can't imagine a man of your calibre went out and bought a kit as in the link - hows yours looking?

Dave-R · Post by **Dave-R** » Wed Feb 23, 11 4:51 pm

What happened to the old trick of just packing a bag of dry ice under the intake?

Jon Connolly · Post by **Jon Connolly** » Wed Feb 23, 11 4:52 pm

Just get a plate heat exchanger ... found in any domestic boiler and typically rated 25 - 40 kw in something the size of a box of kitchen matches

dustymopar · Post by **dustymopar** » Wed Feb 23, 11 5:06 pm

I expected something from the 'Building Services' repertoire - good solid engineering

I read that C02 is at 80 below at atmosphere, which is probably what you need to even touch moving air/fuel. Have you measured the delta-t?

Jon Connolly · Post by **Jon Connolly** » Wed Feb 23, 11 5:23 pm

dave ... ice isn`t low enough temp to start with

i`ve been putting fuel in at upto -53 c already, probably netts down to -20 / -30 c at carb inlet

co2 will probably nett you -50 c at carb ... it is then conduction that cools the incoming air charge i.e. all the carb air passages are chilled without interupting airflow or putting obstacles in air path

By using a 10 / 16 plate insulated heat exchanger you can put a jet on the co2 inlet which turns the rest of the co2 circuit into an " evaporator " with outlet vented to atmosphere. Petrol takes the opposite path to maximise heat transfer.

Control is nothing more than a solenoid valve brought in and out with the same thumb switch I use for nos. Backed up with a widow switch so only works at w.o.t.

Excess co2 is vented to the underside of the car and discharges next to exhausts

Will have it built for first meet

IF YOU SEE A BIG EXPLOSION .. DON`T TRY IT

dustymopar · Post by **dustymopar** » Wed Feb 23, 11 5:34 pm

Perhaps build up slowly with a small C02 metering jet

When is the 1st run?

Pete · Post by **Pete** » Wed Feb 23, 11 6:08 pm

...alternatively, use a bigger engine

Jon Connolly · Post by **Jon Connolly** » Wed Feb 23, 11 6:18 pm

Pete ... you cheeky monkey