[turbo d]

Hi have been playing with some Scalextric BTCC cars during lockdown, but have found after a number of laps the lens of the digital chip starts to wear and so the changes start to get intermittent . the height under the chassis behind the led is about 1.3mm but the led hangs down lower , is there an optimum chassis height to stop the led wearing ?

[BAracer]

There are better people on here who may be able to give you a clear indication, but the height will be a function of how flat your track is. Standard Scalextric cars don't have suspension, so the LED must be catching on a raised part of the track, a joint perhaps...

If you manually push it round the track, maybe you will hear or feel where it is touching.

[Nonfractal]

Turbo..
There is no simple answer to your question. 
The track, wheels, club rules,  tyres, magnet (or not) all play a part 

I would suggest that no matter how high your chassis rides, having the led riding below that height is never a good idea,
Any damage to the emitter LED will impact your lane change 
AlanW

[mikefi]

Must be a type H chip.... 

These run of chips seem to have the LED protuding from the DPR hatch a lot more than the previous G version...

And are prone to being scratched if your running a low car...

Suggest...trim off the melted mounting points from the front of chip with a scalpel, swann morton no3 with no11 blade(my favourite)...

This allows the chip to move upwards a little and recess the led...I then cut a little rigid foam to insert under the front of chip to support it....

You can buff up the scuffed led with either burnishing cream or a bit of T cut..use a cotton wool bud..as they say buff on buff off!


I will try and post a pic later

[munter]

swann morton no3 with no11 blade(my favourite)...

Mine too

[Tamar]

You can buff up the scuffed led with either burnishing cream or a bit of T cut..use a cotton wool bud..as they say buff on buff off!

Although this would make Mr Miyagi very happy there is an easier way to "resurface" the IR led's surface.

A good clean and  a simple drop of clear acrylic paint over your IR led will restore the surface to a perfect shine.

Hope this helps

With kind regards
Tamar

[UshCha]

you could be crass like me, and put somthing in-front of the LED so it hits not the led.  A Scrap of plastic perhaps even a bit of hot melt glue BUT DO NOT GET IT ON THE LED.