Talk Morgan Forums Thread Like Summary - Question on Plus 8 ‘black box’

Can someone please tell me what this box with a foam top is. Looks like some sort of emissions capture device - or not! The top filter part is badly deteriorating. Any direction on where to source the foam mat is appreciated. Does the unit need any routine servicing?
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Can't resolve your picture but from your description it sounds like top of the heaetr box. If so any hardware shop will sell such open cell hard foam.

Looks like a hear box to me.
David if you run the heater fan at full with the engine off can you feel an air flow into the box?
It is not a style I recognise but MMC used the sort of open cell foam sheet you get for aquarium filters.
See here where there seems to be something similar
https://www.gomog.com/allmorgan/CabinHeaters.html

Yes, John. My guess as well. Below is the photo with a easier orientation for you to recognize, with reference points. I also am adding a photo of what the car looked like originally.

However, as this cabin heater is a post-Smiths, so the bulkhead intake cover likely rusted out and some owner replaced it with something (very well and likely homemade). The original manufacturer,was a Pecks cabin heater and they went bankrupt. Sadly, many owners (1987-1993) were convinced to replace their Smiths with a Pecks which didn't turn out well for them but did for the Smiths crowd! That being said, earlier cabin heaters are a breeze (PUN!) to fix and even upgrade. The famous John Worrall used to sell a polished replacement. (also below)

Additionally, it looks like a non-original grid.

I don't use foam. One has two options to attempt to increase airflow. Either direct the incoming air from the louvres (and filter it) or leave it open. (shrug)

Lorne