Tank / Exhaust Heat

[Patrick]

What are you using to heat shield your tank from your backbox(es)?

Also how much space are you leaving between the tank and the exhaust?

[Patrick]

Some bits and pieces from the build thread relating to this topic:

Originally Posted by peterux

Patrick,
I have been having the same thoughts after seeing a post on John's SVA section above. I'm thinking of mounting a galvinised heat shield above the exhaust boxes mounted about 10mm from the box and another 10mm from the fuel tank.

I have had a look at the old SVA manual and all I can find is a statement that fuel system 'components should be mounted to avoid the risk of fire in the event of a fuel leak.

The light blue Sportster at Stoneleigh (S683 AWP) has an under floor system and I think passed it's SVA this year. Does anyone know the owner? Perhaps we could get some photo's?

Any other ideas?

Peter

Originally Posted by Patrick

I was looking at leaving 2 - 4 cm space between the boxes and the tank with perforated ali + heat mats.

There's a bunch of pictures of the blue sportster on our site: http://www.msportster.co.uk/detail.asp?cat=12&offset=48

It looks like its using an E46 M3 rear box very close to the ground. My plan was to have the boxes and the tank much higher up.

Originally Posted by peterux

Yes, that's the one. The boxes certainly look very low?

If you raise the tank higher, does the fuel filler neck hit the rear GRP bodywork?

My fuel tank came with a very short piece of filler connecting hose, so I assume that there is not a lot of space?

My Rover 75 uses that perforated ali stuff all over the place underneath but I think it is expensve? Nice and light though and I expect the SVA man would be pleased.

Peter

Originally Posted by EddyP

There's a cheap source of it right there then
go get under some 75s in the breakers Patrick.

Originally Posted by Patrick

Yep the boxes are very low, there cant be more than 5 cm ground clearance - i hope he has no speed bumps where he lives!!

Not tested filler height yet, but I did run into an issue - if you put the tank too high the seat belts rest on it - not good. If you have an incident it woud dent the tank and make the belts slack. I think I've found a good compromise hight where the seat belts dont get in the way, but you still get a good 8-10cm between the boxes and the tank (with out the boxes looking too silly). I'll post some pictures later on the progress.

My E46 uses those metal things too, so there should be a decent supply in most scrap yards - good tip Eddy thanks

Originally Posted by Patrick

Been busy working on moving the tank up to make more room for the exhaust boxes. A few issues, go too high and the tank gets in the way of the seat belts, same with the filler. I think it should just work in the current position. The tank need to be moved forwards a bit too so I've trimmed a little off the diff bracket - the shouldn't have any effect on the strenght of this bit as its braced further down.



Just enough room here for the belt - its a bit slack and low in this pic





Lots of room