LegendsRacer - Legends & Bandolero Racing Forum
LEGENDS => Setup and Handling => Topic started by: Racinjj on January 12, 2009, 12:35:14 pm
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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.
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from the rule book..
"..directly below the centerline of rearead housing..."
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I guess I should have looked in the rulebook ;D
Thanks!
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also it is not the backing plate. It is the back of the drum. This will make a difference.....trust me :-)
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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
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Geez, I was all screwed up, thanks for clearing that up.
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;)
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at the nationls they had a little guage that they would slid in. Kind of a go/no-go type.
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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.
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I have a go no go gauge that is 6-1/16" long for that, very handy.
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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.
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I replaced all of my heims and aluminum rods with aftermarket teflon lined rod ends.
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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.
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great idea
Scott
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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.
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I would think, it would be worse on the pavement. As there has to be a lot more load on it. It doesn't seem to be from the dirt persay cause our other ends don't wear like the panhard ones.
We went to the best end FK Makes (we are an FK Dealer) and they have lasted much longer. The "cheap" ends seem to show wear after one or two races.
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Pavement is more of a constant.
With dirt you get changes in the track surface (holes, ruts, etc...); Which affects suspension points differently. That makes parts wear differently.
Is that making sense to you?
Maybe I should get some sleep. Be happy to go rounds after a nap. ;) :D ;D
That still doesn't change the rule that INEX mandates for a minimum 6" distance from the brake drum to the frame rail.
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I was kind of thinking that after I posted, maybe the slidding into corners and hitting the holes and stuff would cause some of the wear. It's strange though, they are the only ones we see significant wear on so quickly. I don't know what they would do if the wear caused you to be too close to the frame rails. I know you are allowed to "show" damage if a measurement does not make it. So could you wiggle the car around?
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On dirt we really pound on them, especially when the track is heavy and rough like it often is here. Like Steve said I am sure that the impacts from slamming the car against the cushion wears them out a lot faster than the more gradual load changes on asphalt.
On this subject, where do you want the rearend? I would assume all the way to the right judging by how things look on the car but I havent stringed a car to see how close the right side wheels are to being aligned.
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I was actually thinking of pulling the right rear in a little to help with weight transfer to plant the right rear tire. What do the other dirt track racers on here do?
Dirt tracks can be really rough on panard bars or anything similar. On modifieds around here, it is not all that strange for a rough track to bend or break j-bars (a short panard bar for the asphalt guys) or their mounts. Did not think about it, but I might upgrade the heims on the panard bar to be safe. When those go, it can get expensive.
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We run our rear pretty much center in the car, the front wheels can be adjusted in our out with your arm lenths to match. Now and then we might shift the rear, but have never really seen a gain. Depending how far back you are with the rear, due to the curved frame rails there is not a whole lot of side to side movement allowed with the 6" rule. Note: be careful to check both sides for the 6" rule, I know of a guy was DQ'd cause neither side was 6" (bent frame I would think).
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actually I shortened all of my trailing arms right up and could not get 6". It is just from the curve in the frame you have to move it back a bit and you will get the 6".