1969 to 1970 Roll Bar frames

[500Jon]

Hi Racecar Folks.

When did the windowless regs come in in Nascar please?
If I was doing a 69 500 Racecar which system would be correct?
This has an obvious effect on Rollbar side frame construction!

[500Jon]

Why has Petty's new BIRD got the FLATTER older design?
Surely this is weaker in the door area?

[500Jon]

Hmmm?

Found these so I would think this is right for a 1969 Charger 500?

500Jon

[Ghoste]

I believe the windowless reg came in sometime during the Dodge Daytona running as an effort to slow them down.  Prior to that most of them ran with the side glass in place and the initial running of the wingcars did so as well.  It may have been the following year when the Superbird came online though.

[Aero426]

I believe the windowless reg came in sometime during the Dodge Daytona running as an effort to slow them down.  Prior to that most of them ran with the side glass in place and the initial running of the wingcars did so as well.  It may have been the following year when the Superbird came online though.

There is no one correct answer.   All cars had crush style bars on the driver side.   The glass mechanism can be made to fit.    For speedway cars,  it was common to have the flat style bars on the passenger side.   When side glass became illegal, it was common to eventually upgrade the passenger side to crush style.      Sometimes this happened in the event of other work, like crash repair.    There are exceptions: my car has crush style bars on the passenger side and I have a photo of it with the glass in place.      

[Ghoste]

Was there a firm date on side glass?

[odcics2]

Was there a firm date on side glass?

I think the date was March 15th., 1970, to get rid of side glass, during a race.

You could still qualify with it or use it during "special speed exhibitions". (200.447 run, for example)

A very short time later, it was also banned for qualifying.  I believe there is a Nascar newsletter out there detailing the exact dates.


BTW - the very first restrictor plate race ever was at the Yankee 400 in August, 1970, at MIS...

[Highbanked Hauler]

 The caption under the picture says electric fuel pump and thermos behind the seat,looks like an oil cooler to me or did I miss it ?

[teddy1500]

There was also rule that required doors to be able to open, that may affect roll cage design, but the rule changed mid/early 70's.

[odcics2]

The caption under the picture says electric fuel pump and thermos behind the seat,looks like an oil cooler to me or did I miss it ?

Should have said, axle cooler and thermos.   There were never any electric fuel pumps back then!!

[odcics2]

There was also rule that required doors to be able to open, that may affect roll cage design, but the rule changed mid/early 70's.

Doors were required to be bolted closed with straps since the mid 60s, per the Nascar rule book..