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SPA SUMMER CLASSIC
Calendar: Historic Racing
Mike Bell
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27 Jun 2019 to 30 Jun 2019 06:30 to 17:00
*The times shown may change, depending on DST settings
Location: Spa Francorchamps

The now well established summer visit for several big UK grids.

Will include a CSCC race and the 'Mini 6hr' 3hr race saturday eve.
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Old 29 Jan 2019, 12:18 (Ref:3880410)   #2
Mike Bell
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The ‘3hr’ race website is up and running, with regs and entry forms.....

http://www.spa3hours.com
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Old 29 Jan 2019, 16:05 (Ref:3880466)   #3
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Take a 2019 Tea Break with Delta

Hi all.....bit of brain (!) picking required. And mods please move if needed. We are going to enter the Spa 3hr and have noticed reading the regs that the organizers have dropped (at least since I was visited the event in 2017) Yoko AO48’s, which the car has been set up for over the years, off their allowed tyre list. Now, aside from the obvious costs, can anyone tell me what is difference the mandated Dunlop or Avon historic tyres make and what I should consider altering on a small 1300cc fwd saloon to make these tyres work. Are they sticky/long lasting/crap? What are most preferred Dunlop post historic or Avon CR6ZZ? It seems a bit strange as in period (mid 70’s) the car like most saloons of the time, would have run on slicks. I’m asking as I don’t have an unlimited time or finance budget so days of testing aren’t really a runner for me. And the tyres are bloody expensive too!


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Last edited by Mike Bell; 29 Jan 2019 at 16:11. Reason: Moved from tea break as appropriate to this thread.
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Old 29 Jan 2019, 16:31 (Ref:3880472)   #4
Mike Bell
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First, my take is that the organisers are trying to make sure that the later cars don’t have a huge tyre advantage, which would be the case with slicks or Yokos. I seem to remember that there was some disquiet when the race was first run regarding different cornering speeds.

Avon ZZs are virtually universally used in the Spa 6hrs. They’re radials, for a start, wear well, are good in the dry and excellent in the wet. Personally, I wouldn’t even consider Dunlop Post Historic over them.

The one disadvantage of the Avons is that they are heavy in comparison, but I’ve raced a few cars on Dunlop Ls and ZZs in different races without having to change any settings. But I am lazy!

The other factor to consider is the sizes available and making sure there is one suitable for your car.....
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Old 29 Jan 2019, 17:15 (Ref:3880478)   #5
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delta should be qualifying in the top 5 on the griddelta should be qualifying in the top 5 on the griddelta should be qualifying in the top 5 on the grid
Mike is spot on. Put a set of ZZ on and forget about them for a couple of years . Mike correct me me but I think we had a new set for 6 hour one year then left them on for the following year . I love driving on them . Good luck
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Old 29 Jan 2019, 17:25 (Ref:3880481)   #6
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Mike is spot on. Put a set of ZZ on and forget about them for a couple of years . Mike correct me me but I think we had a new set for 6 hour one year then left them on for the following year . I love driving on them . Good luck
Yup, we did two 6hrs on same set...... Seem to remember it being ‘slightly damp’, which probably helped!
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Old 29 Jan 2019, 17:45 (Ref:3880486)   #7
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Thanks folks, I like what you are saying..... especially about the wear, im really liking that!! Ive no problem with the regs, they are there so abide by them! It’ll be interesting to see how the car works on them. Has anyone done a direct comparison? .....All I need to know now is what paperwork and how much extra time I’ll need to bring my car from Ireland via the tunnel after he 29th of march but thats for another day.... :-)


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Old 29 Jan 2019, 19:09 (Ref:3880504)   #8
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Thanks folks, I like what you are saying..... especially about the wear, im really liking that!! Ive no problem with the regs, they are there so abide by them! It’ll be interesting to see how the car works on them. Has anyone done a direct comparison?
Most people will use a new set of ZZs every year for the 6, but we had a very wet race one year and wear was less than usual! Your car is FWD so obviously will treat its tyres differently to a RWD 60s GT. Certain rear drive cars that put a lot of weight on one wheel, such as an FIA 911, can require that tyre replacing, but unlikely in 3hrs. That could be a problem on the left front of a FWD car as well, but again, you’re only doing 3hrs.....

Generally the ZZ will result in a slightly quicker lap time than an equivalent Dunlop crossply around Spa in the dry, and quicker still in the wet. On a RWD car the radial will be more resistant to drifting, and maybe make the car understeer more. I can’t tell you how they will change your particular FWD car, though!

Hope that all makes sense....
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Old 29 Jan 2019, 19:26 (Ref:3880507)   #9
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Makes perfect sense Mike. It is my concern, the understeer becoming far more pronounced especially with fwd. I can see the back end having to do a lot of work to try tame the front. As we dont run a diff it could get interesting!


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Old 29 Jan 2019, 20:42 (Ref:3880517)   #10
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How much is a set of ZZ? Approximately.

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Old 29 Jan 2019, 21:48 (Ref:3880525)   #11
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SPA SUMMER CLASSIC

I have seen them at around £200 each for the 185/13’s. Not the cheapest tyre out there!!


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Old 30 Jan 2019, 05:13 (Ref:3880548)   #12
Mike Bell
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I’m guessing the Dunlop’s would more, however? And not last as long!

As regards understeer, that can possibly be dialled out to an extent by juggling tyre pressures.

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Old 30 Jan 2019, 06:38 (Ref:3880556)   #13
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Specific regulation states: Any question about tyres? Please email us at: spa@motorclassic.com Article 3 ref to licences is well documented…
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Old 30 Jan 2019, 06:47 (Ref:3880558)   #14
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What would your question be, then Gerard? Can I use slicks?

The licence requirements are as normal for Spa, so no worries for most UK club racers as long as they have Nat A.....
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Old 30 Jan 2019, 07:02 (Ref:3880567)   #15
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What would your question be, then Gerard? Can I use slicks?
Unfair Your Honor! But yes, in a certain way slicks should be allowed in this period as many stated including Podd. I dont dare to say that if, for instance, using radial slicks with a pattern thread design……… No, impossible! But may be Podd can ask to use A048's if he has a huge stock.
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