The fuel cell in my March 79V completely filled the LH side of the chassis side member, something like 55" long. I believe it held 18 gallons! Way more than is needed for anything I'll be racing in for the foreseeable future.
I'm going to be ordering a new cell that will be roughly half the length of the space available. If this were designed this way there would be an aluminum diaphragm built in to the monocoque, but I really don't want to alter the chassis in any non-original way. I'm thinking I could cut a section of semi-rigid foam to fill the extra space which is forward of the cell on the LH side, and the whole RH side.
Has anyone done this? What type of foam would be appropriate? I'm thinking this could add a little to the safety of the car in a side impact situation, in addition to filling an empty space, so the selection of the right foam is important. I feel it should be closed cell, non-flammable, and also offer some impact resistance. Does such a thing exist?
As a side note, I'll be ordering two LH cells, most likely from AeroTech Services as I think they build the best cell and are local to me. If anyone would like to add to my order we should be able to get a slightly better price. Please contact me and we'll see if something can be worked out.
Ian
SoCal
PS. Oh yes! It should also be light.