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There are layers of regulation
foremost :
Appendix K and the rules / principles behind the HTP system
the idea behind the HTP is that the cars have to be technically identical to what the were in period.
consequence is that no regulation regarding tire sizes iand wheel size is needed, they have to be the same as per original period spec RACED CONTEMPORARY IN INTERNATIONAL RACING, end of story unless AN EXCEPTION is allowed,
this is why you wont find "allowed tire size regs", they are just not necessary and would be redundant
An allowed exception from the principle going down in wheel width is allowed (a deviation from period spec )as this will only make your car slower, to help cars with hard to get tires and wheels
another notable deviation allowed in Appendix K are ally rads instead of brass or whatever was used in period,
apparently is gets more and more difficult to source brass rads as the skill making them is dying
there are many other details that are not spelt out either,
a HTP specification is checked against available info on period cars
and if is found to differ, you get a query and no HTP
I had a missing bonnet opening rejected once on a sports racer
we had to cut the hole in to get the HTP
in my opinion the HTP system is workable on homologated cars
because is easy to check HTP application against the original homologation document
it gets difficult on badly documented one off obscure single seaters, for instance, because the question is: what was the original spec ?
now Junior regulations are fascinating because they expressly allow several modifications that are agains the principles behind the HTP system such as 1100 cc Ford engines in Lotus 18 in class C, because this combination can not have existed in period as 1.100 Ford were not raced on those years.
This means that currently Class C 1100 cc Lotus 18 Ford cars are legal to race in Formula Junior, but strictly speaking they should not get an HTP, at least not for that period.
This has been noted and the discussion is ongoing, expect some surprises.
Now currently an HTP is not needed in the UK Formula Junior Championship, there You can race with an HSCC VIF,
but for the Lurani Championship an HTP is required.
interesting, isnt it ?
RuE
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