Learning how to build Lotus Seven replicas...together!
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PostPosted: August 22, 2019, 8:01 pm 

Joined: December 1, 2013, 10:48 pm
Posts: 68
Location: Atlanta GA
Has anyone tried an air to water intercooler on a 7?
I'm strongly leaning that way for a few reasons :

The packaging is smaller
Won't block the radiator
Can have the heat exchanger in the trunk
Less pressure drop

Previously I was concerned that it would be a problem for road racing but after BMW and many other oems started using it- it can't be that bad.

Any thoughts? I think air to air is ideal but packaging is tough

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PostPosted: August 23, 2019, 10:49 am 
Mid-Engined Maniac

Joined: April 23, 2006, 8:26 pm
Posts: 6011
Location: SoCal
Good points:
    Better heat exchange per volume
    No ducting needed to/from core like air/air system
    Can be "super cooled" with ice for additional performance

Bad points:
    More expensive
    Less reliable
    More parts (intercooler heat exchanger, hoses, pump, reservoir, on top of front-mounted radiator)
    Power requirement from additional pump
    Consumes more space
    Still needs an air/water radiator in the airflow to get rid of the heat. If one reason to add the system was not having room for a traditional intercooler ahead of the radiator, where is the air/water radiator going to go?
    Adding ice only works for a very short time.
    Requires ducting to above radiator.

The worst aspect, however, especially for road racing, is heat-soak. The coolant heats up faster than it is cooled, resulting in higher charge temperature, lower performance, and moves the engine closer to detonation.

I decided it wasn't worth all the overhead for what it provides.

Midlana book: Build this mid-engine Locost!, http://www.midlana.com/
Kimini book: Designing mid-engine cars using FWD drivetrains, http://www.kimini.com/book_info/

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