17 replies to this topic

[mini.cooper998]

hi as the title says why cant you use an intercooler with a pull through system why does it have to be push through. im thinking of buying an eaton supercharger kit for my 998 johnspeed or another and wondered why i cant fit an intercooler to it. one of the other posts says that can only be fitted to push systems. any help greatly appreciated
thanks

andy

also if i can fit one whats the best to buy

[Ethel]

couple of things would make it very difficult, finding room to fit the plumbing in on a charger design to blow directly in to the inlets. More problematic would be running fuel/air mix through an intercooler and keeping the fuel and well air mixed in the right proportions. An air to water charge cooler would be your best chance, but building a blow through system would be better.

[mini.cooper998]

cant find a way of mounting the charger high egnough to get a carb in (cant aford fuel injection at mo) so will have to run pull through. water injection sounds good as id like to take the pulley size down 19% to 1.2 bar boost and would need to cool it.
would you water inject at fueling or after the charger

thanks in advance andy

[Oldskoolbaby]

Its because you need to cool the air that has already passed through the compressor. When the air is compressed by the turbo or supercharger, it heats up dramatically, where as the air heading towards the compressor is quite cool. Fitting an intercooler to the inlet pipe will probably only drop the temperature by a couple of degrees.

[mini.cooper998]

thought it would be knocking the mixture out but wasnt sure will look into water injection instead
thanks
can anyone recomend any good systems

[Ethel]

I didn't actually mean water injection but that would be another option.

A charge cooler would be a bit like having a miniature radiator sat between the charger and inlet running in reverse, taking heat from the air. Water has a much higher heat capacity than air so the cooler can be much smaller than an air to air cooler - you'd need a second radiator and a pump to dump the heat from the cooler just like a radiator for an engine.

[smith1380gt]

VMAX sells a supercharger cooling system that has an electric pump and separate heat exchanger. Sells for 200 I think. Doesn't seem like it would be very efficient, as it essentially cools the supercharger case. I have been considering water injection myself because i ran it very sucessfully on a turbo mr2-- you would have to plumb it in after the supercharger, basically at the manifold. The water needs time to vaporize to cool the charge, so it needs to be back a bit from the head. Not much room there.

[Wil_h]

Fitting an intercooler to the inlet pipe will probably only drop the temperature by a couple of degrees.

By fitting in the inlet pipe do you mean between the carb and SC or befoer the carb?

If before the carb, the effect will be zero, if after the carb, the intercooler would likely heat up the air as it would be cooled as it was sucked through the carb.

I know you're not suggesting this by the way.

[matty...]

You would benefit dramatically by doing a blowthrough setup. There is alot more scope for increasing the power as the charge inlet temps can be 'controlled' better with use of some knid of charge cooler whether it be an air to air cooler or water to air.

The problem with water injection (especially on a blown engine) is trying to meter to flow of water at different rev ranges and loads and with a blown engine you have the added complication of variable air pressure when on and off boost!?

Edited by matty..., 25 March 2008 - 12:10 PM.

[coopertrooper2001]

I have a VMax cooler - my understanding is it cools the case in an attempt to reduce the temperature in the engine bay. It gets damn hot in there with the heat from the manifold.

[mini.cooper998]

how can i fit the cooper s euston charger to an a-series engine and make it blow through while not affecting the body work
any ideas
thanks
andy

ps if i use a pull through system and mount water injection would it be possible to mount a potentiometer to the throttle likage and use that to control the water injection pump (only an idea)

[matty...]

Have to admit im not too clued up on which super charger is which but this looks to be a good starting point with regards to engine layout!

[Oldskoolbaby]

Thats an awsome setup. You could get some real good power from that as the intercooler would be much more usefull between the blower and carb in this instance.

[miRon]

the clubby now has an uno intercooler between the plen and charger ,
the charger is from a prototype feista ST....'found at dunton'.......

[mini.cooper998]

this system wont fit under a round front though and i want to keep it standard any ideas on an alternative small blow through charger
thanks

andy