1441 replies to this topic

[idare2bdul]

At Falcon Discount-R-Us?

I think he was implying that the feeler gauge he bought would cost more today. He estimated about as much as a Falcon motor today. The plus side is that It's hard to burn up a feeler gauge.

[MSwiss]

.050 is the diameter of Koford M259 steel tubing.It's $1.25 for a pc. a bit longer than 3".

[Hworth08]

True slot RACERS, not just a driver, don't worry about cost, just performance!

Take your pick. Prices from a TSR to a good G-12 motor.


http://www.easternga...r-gage-sets.asp

[Dominator]

OK, so I started building an F1 and wanted to check with the powers that be before I continued building. I tried getting a clarification on this in the F-1 rules thread in D-3 but didn't get a clear answer so here it goes.

As you can see I have a length of brass for the guide tongue that is connected to the center section and is being retained by a wire on the nose of the car. The amount of play in the tongue is about .005 -.007" horizontally and even less vertically, essentially just enough to not hang up. Since the tongue will be attached to the center rails of the car is this still interpreted as a floating guide?

g]

[edited pictures to improve clarity - moderator mph]

[Noose]

Dom, the "board"is all traveling but we all be together tomorrow to discuss your question as well the one about hinges and will have a reply posted.

[Dominator]

Thanks Noose

[TSR]

Not my place to say but it looks fine to me...

[Dominator]

Thanks for the kind words Philippe

[IRRA Retro Racing]

Since the tongue will be attached to the center rails of the car is this still interpreted as a floating guide?

Dominic,

No it is not interpreted as a floating guide.

Depending on how you attach the front axle, there might be a case for checking the sideways movement of the axle as there is a rule for that, can you post a photo of the finished frame?

(Posted by Dennis Samson for the IRRA Board)

[Dominator]

Thanks for the reply Dennis.

As for the front axle, I held off on building the rest until I knew about the guide tongue as it would be much easier to fix that with the front axle out. I will not be using an axle tube, just some L brackets to attach the axle. I will space out the axle and position the wheels so the are stationary. I'll post some pictures over the weekend.

Thanks again,

Dom

[SlowBeas]

Another dumb body height question...

The rule says maximum body height at the rear is 1.375" (excluding any added spoiler). Measuring from the manufacturer's intended cut line to the top of the tail, the retro bodies I have on-hand are only a little more than 1.1". It would take some creative raking in order to gain that much added height - which is not allowed.

Are there actually bodies out there with that high a rear end? If so, can someone give me some examples?

Just wonderin'.

Beas

[MantaRay]

Beas...

At the R4 race this weekend... Body height was measured from the car on a tech block. 1-3/8" body height, 1-3/4" total height with spoiler straight up, not bent. Not from the cut line. A few guys were sent back to remount the bodies lower.

[Noose]

Correct, and there were not many. If the body is severely raked, then most of the nose and grill would need to be cut off.

[tonyp]

Quick, hide all the illegal stuff, Noose is back...

[Noose]

I have another name now... the "Tech Nazi".

[Mopar Rob]

Correct, and there were not many.

Hi Noose:

Proud to be one of them.

[911GT3]

Try the JK Porsche 908. I had to lower it to make it legal at the R4. Noose gave me the answer to make it legal. I assumed I had to keep the body even front to rear.

[Noose]

The JK Porsche 908 is going to be removed from the approved body list because it is a 908/3 that ran in later years than our rules allow. OK... we blew it... but we allowed it to race on the basis it met the height rules, etc.

There are some new bodies that will be added as soon as I can take the pics, etc.

[911GT3]

As I was mounting the body, I quickly figured out there would be a problem with the JK Porsche 908 body. The three rules that stuck in my mind were 1) maximum height 1.375" (General Specifications paragraph p); 2) minimum front grill height of 1/16" (Body paragraph a); 3) raking of the body (General Specifications paragraph p).

I could lower the body equally front and rear to the minimum height and violate the minimum front grill height rule. Lowering the body an equal distance front and rear could not be reversed if it was judged the body must have a minimum 1/16" tall grill.

The severe raking rule left too much to interpretation. It is logical to assume that if the body is well below the maximum height that the rear end could not raised to the maximum height (incline from perpendicular). However the way the rule is written, it could be argued that raising the front end (lowering the rear end) is raking. It is also assumed that most racers would not even think of raising the front end of the body. However, there is no clear statement about the chassis datum being the guide flag mount, front axle or rear axle.

Having no previous experience with the rules making body, I took the safe route to allow a modification at the race.

[Fast Freddie]

I'am certainly new at this, but I use to be a tech inspector in the Mid-Atlantic USRA Series. The answer to these questions may seem obvious, but answering them could save a lot of aggravation.

1) When the cars are teched in on tires that meet the minimum diameter requirements and the body height is correct at that time. Their tire diameter will be out of spec by the 3rd-4th heat and the underchassis clearance will also be out of spec. Are there any mid-race tech procedures at any race?

2) If a racer is on the maximum body height and minimum tire diameter at tech in and has to change tires to a new set .820" (that has not been trued) the body will be too tall to pass tech. Why not change the body height rule to only apply to just the body and not to the mounted body on all four wheels?

Just thought I'd ask. I plan to avoid both problems by mounting the body with .820" tires. I'll end up with a lower body height with minimum tire diameter but all will still be within specs. Thank you,

[Noose]

In Columbus we planned for a mid-race tech if necesasary. It was going to be determined on what I saw during tech. It wasn't necessary.

As for the body height situation, the only ones in came into play with were the Chevron GTs. If others were mounted that high in the rear there is no way they could have the required amount in the front end or not distort the wheel postioning.

Local areas running the A, B, C main format should do a tech for the guy moving up. Tire size and clearance at a minimum. If there is a doubt about the height of the body then check it.

As for the clearance, it is not the problem everyone seems to think it is. Of course when a car is placed on a block with the guide in, the front is going to be a lot higher. In fact, on the scratchbuilts you will see that the front will probably be around the .050" mark anyway. It all depends then on braid depth.

[Dominator]

OK motor bracket question,

Can the back end of a Womp or Sprints Plus chassis be used and would this be considered a three-sided motor bracket even if the sides meet at the bottom of the motor bracket on these chassis?

Also if you were making one out of brass, does it have to be a single piece with two bends or can you cut three separate pieces and then solder together?

Not trying to cause trouble just thought if this was possible then maybe some newbies would have an easier time getting their chassis built/started.

[Fast Freddie]

There is nowhere in the rules that state that cut lines have to be observed. I assume that as long as the front and rear dimensions are adhered to all will be OK. What do you mean by excessive rake? You already have a .035" chassis rake with minimum tire. Oh and by the way if anyone is interested the Norris Industries Ti22 was run with no body material in front of the front winglets. Cutting this body to realistic dimentions would create a rake. Since there is no minimum height restriction can this body be mounted as low as possible? Thank you.

[Lou Cicconi]

Regarding the ruling given in post #14 of the "IRRA Rule Questions & Answers" thread, in my estimation this is not a hinge at all. This is a pivot. Please clarify the differences.

Thanks,

Lou Cicconi

[Josh Crutchfield]

What is considered a centerline hinge?

Thanks,

Josh