Solved by faksta, woodinsight and others: One More Day at the Races

[Allemano]

Hanford?

No.

The series for which car #20 was built does not take place there anymore..

[woodinsight]

I don't recognise the track you posted - maybe in use for NASCAR nowadays?

This doesn't really help that much in identifying the car though.

Will keep searching as always.....

[Allemano]

I don't recognise the track you posted - maybe in use for NASCAR nowadays?

This doesn't really help that much in identifying the car though.

Will keep searching as always.....

Yes, it's still a NASCAR raceway.

[woodinsight]

Pocono?

[Allemano]

Pocono?

Correct! 

[Allemano]

I checked, but unfortunately it's still not enough to google the car.
But there's hope: it appears on the first results if you search two names, well known in USAmerican racing.

[Allemano]

Found another picture

[woodinsight]

What I've found is that #20 is a March Cosworth entered by Kraco Enterprises (Electrolux/Kraco Stereo sponsors) and driven by Michael Andretti at Pocono Raceway in the 1984 Domino's Pizza 500.
He retired with engine problems.

[Allemano]

That doesn't fit the infos I have and you're about 10 years too late.

[faksta]

If no one minds, I'd finish it. It is a Gebhardt - Offy from 1975 as driven by Mike Hiss, but failed to qualify.

P.S. But why you said it was not a circuit racing? 

[woodinsight]

Okay - I thought it was a bit too old for the year.
I'm more of a sports racing specialist and single seaters are sometimes difficult for me to identify.
Anyway, well done Faksta. That should tie up an interesting and enjoyable group puzzle.

[Allemano]

If no one minds, I'd finish it. It is a Gebhardt - Offy from 1975 as driven by Mike Hiss, but failed to qualify.

P.S. But why you said it was not a circuit racing?  

Oh how I missed that roll-eye button..

Faksta, it was kind of a joke, due to it's triangular shape. Of course it is a circuit and strictly speaking I never did object:

(...) Somewhere else' may also mean 'not in circuit racing', or not?

This car is related to a race track which is not circular, at all..(...)

By the way: the name "Gebhardt" is wrong.

[Allemano]

Okay - I thought it was a bit too old for the year.
I'm more of a sports racing specialist and single seaters are sometimes difficult for me to identify.
Anyway, well done Faksta. That should tie up an interesting and enjoyable group puzzle.

I'm glad you liked it!

[faksta]

Gebhardt is wrong because it is a Gerhardt 

[Allemano]

Right!
Well done gentlemen!
So, after seven interisting pages I can lay this to rest.

Results and tally is following soon!

[Allemano]

Results:

#01 Cegga AC Ace (faksta)

#02 Caracal D (faksta)

#03 Huambo NSU by Amadeu Inácio from Angola (Paul Jaray)

#04 Spider JSK from Czechoslovakia (faksta)

#05 Lenkin GP (Ehhxekt)

#06 Momo 2000 Opel Conrero (woodinsight)

#07 Fiat 1100 Lombardo (faksta)

#08 Alfazoni (João)

#09 Katipo MJ70A (faksta)

#10 Veeteor LS/R (faksta)

#11 Hrubon 1300 Gordini 1968 (woodinsight)

#12 Fiat 1100 Fona 1949 (woodinsight)

#13 Wally Russell's Nedloh (woodinsight)

#14 PORSHCE ９０８Ｊ－ＣＶＴ (faksta)

#15 Barqueta Competicion Suzuki 1000 (Oguerrerob)

#16 (John) Bolster Special (woodinsight)

#17 Mirage-VW from 1969 aka the Geraldes Special (woodinsight)

#18 Mili VW (faksta)

#19 Coral Special 1964 (woodinsight)

#20 Mike Hiss' Gerhardt Offy Indy racer 1975 (faksta)

The score

faksta: 9 points

woodinsight: 7 points

Oguerrerob, Joao, Paul Jaray, Ehhxekt: 1 point each