Rearend Side to Side Measuring

[Racinjj]

What is the official tech procedure for the 6" from the backing plate to the frame measurement?  Is it measured on the centerline of axle housing?  The frame rail tapers in as it goes back so it makes a big difference where its checked at.

[thunder938]

from the rule book..

"..directly below the centerline of rearead housing..."

[Racinjj]

I guess I should have looked in the rulebook 

Thanks!

[RickyBobby]

also it is not the backing plate.  It is the back of the drum.  This will make a difference.....trust me :-)

[justfreaky]

Rear Offset: There must be a minimum of 6" between the
inside edge of the rear brake drum and the rear frame rails
(directly below the centerline of the rearend housing) on both
sides. No wheel or axle spacers are permitted.

2008 Rule Book, page 59, #77
I think Gramps05 posted that in an old thread.

Hope that clears things up.

Steve

[Racinjj]

Geez, I was all screwed up, thanks for clearing that up.

[justfreaky]

 

[IraceLegends77]

at the nationls they had a little guage that they would slid in. Kind of a go/no-go type.

[jgrimracing]

When my brother went through the tech line to check his car before the race the one guy (not sure which) tried to put the gauge all the way through from front to back along the frame rail.  I beleive it was Scott Reinhart who corrected his measuring saying it was at the center of the rear tube.  We made one of those gauges but at like 6 and 1/16" to give a little room for error.

[Racinjj]

I have a go no go gauge that is 6-1/16" long for that, very handy.

[gramps05]

Keep your eye on the panhard bar hiem joints, the ones 600 sells tend to ware or loosen up, you can feel the ware if you shake the rear of the car side to side. They can get worn enough that if you are running this measurement close you can fail tech.

[Racinjj]

I replaced all of my heims and aluminum rods with aftermarket teflon lined rod ends.

[RickyBobby]

600 has a new Teflon hiem that is actually quite good.  They just got them and they are only $1 more than the others. 
I cut a peice of flat steel to 6 1/16 that I use as a go no go gauge.

[IraceLegends77]

great idea

Scott

[MegaMang]

Is that more of a dirt racer problem than a pavement racer?  I haven't noticed any  wear on the panhard hiems yet.  I've changed steering hiems a couple times in the last year though.

Keep your eye on the panhard bar hiem joints, the ones 600 sells tend to ware or loosen up, you can feel the ware if you shake the rear of the car side to side. They can get worn enough that if you are running this measurement close you can fail tech.