Ok, need advice. Next week is my first race....help me be prepared!

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Originally Posted by Rada

Only the caps need to be metal.

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What is the theory behind this?

Legend has it that the caps can melt....
I don't buy it but the shiny metal caps are easier to find when they fall on the floor.. Lol

Metal caps have an o ring in them that can prevent air loss in the case of a valve core failure.

Everyone said all the good stuff.

I have most def passed inspection and raced with no caps at all. Lol

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Originally Posted by tsorfas

I have most def passed inspection and raced with no caps at all. Lol

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Thats nothing. I know a bike that got passed with no pinch bolts in the upper triple clamp. Instead there were zip ties through the holes that were holding the number plate on. Some stuff they look for and other things they don't.

See you there. You'll have no trouble. Ask about the rookie garage. It was all fucked up for me, but maybe you'll have better luck.

I will be posting up personal gear soon. Helmet (L) with eject system. Spyder 48/58 Silver Suit. Suit drying hanger and trailer travel heavy duty hanger. The very best Spyder boots. Gloves (L). Chest and back protector. And a carry bag and spare stuff. Rookie gets first shot. 508 713 5663

Make sure you swing by the RSP garage and say hi(Center garages, nearest the pre-grid), and like Adam said, definitely don't miss the BBQ Sat night after the trophy ceremony.

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Originally Posted by union

Thats nothing. I know a bike that got passed with no pinch bolts in the upper triple clamp. Instead there were zip ties through the holes that were holding the number plate on. Some stuff they look for and other things they don't.

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Oh god, I remember that..... wasn't that Kid? Or DDK?

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Originally Posted by Rambunctous

I will be posting up personal gear soon. Helmet (L) with eject system. Spyder 48/58 Silver Suit. Suit drying hanger and trailer travel heavy duty hanger. The very best Spyder boots. Gloves (L). Chest and back protector. And a carry bag and spare stuff. Rookie gets first shot. 508 713 5663

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Thanks buddy! I'm all good with gear :)

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Originally Posted by OreoGaborio

Oh god, I remember that..... wasn't that Kid? Or DDK?

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I wont say names but you need a nice rack to do it:) I used to get failed for having clips on my rear axle nut.

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Originally Posted by Rambunctous

I will be posting up personal gear soon. Helmet (L) with eject system. Spyder 48/58 Silver Suit. Suit drying hanger and trailer travel heavy duty hanger. The very best Spyder boots. Gloves (L). Chest and back protector. And a carry bag and spare stuff. Rookie gets first shot. 508 713 5663

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You can PM me about the suit hangers

See if you can pit with Sam in N12. We're all around to help

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Originally Posted by Mr. Kurtz

Metal caps have an o ring in them that can prevent air loss in the case of a valve core failure.

Everyone said all the good stuff.

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Mike is absolutely correct.... but…. it may not be obvious as to one key reason why....

Q. Why would I lose air pressure without a sealing valve cap?
A. Due to centrifugal force opening the poppet valve in valve stems.

I just calculated the how and why.
Turns out the poppet valve opening can happen around 130 MPH due to centrifugal force on a straight valve stem (90o valve stem is a non issue).
(Even at NHMS the fastest racers get to approx. 137-143mph down the straight (I measured with a radar gun some time back).

I took into account numerous factors (including the obvious such as wheel speed/RPM, radius to valve stem etc to factor G forces) such as:
-Weight of valve poppet and valve spring -
-G force acting on poppet valve at various speeds (at 200mph there is 1600G force trying to open the valve)
- Mechanical force (spring) required to open poppet = approx. 400grams
- Internal tire pressure keeping the poppet valve closed of 30psi
- Took into account pressure drop at inner rim surface due to centrifugal force on captured air.
- Diam of poppet surface (0.090") exposed to internal it pressure (turns out the air pressure keeping the poppet valve closed it a lot less than you may think).

So that’s why it’s important, a simple metal sealing valve cap is your last line of defense to losing air pressure.

Today I was servicing the chain and tires on my street bike. I noticed the plastic OE caps on my valve stems have o-rings in them.

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Originally Posted by nhbubba

Today I was servicing the chain and tires on my street bike. I noticed the plastic OE caps on my valve stems have o-rings in them.

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I'm sure it has something to do with durability too. I probably check my pressures 10 times a weekend. How long do you think a plastic thread will last compared to a metal one?

http://www.amazon.com/Set-Bullet-Val.../dp/B009C9PA96

Metal :D

Am I going to get grief from tech for anything here?

Love how the official clarified everything about the topic and people still developing theories

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Originally Posted by jasnmar

http://www.amazon.com/Set-Bullet-Val.../dp/B009C9PA96

Metal :D

Am I going to get grief from tech for anything here?

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Are you really doing a rookie weekend too? Or just being a goon?

They aren't mutually exclusive :D.

Last time I took the sport bike to the track, I could not complete a session without it dieing coming out of t12. I couldn't repeat the failure in the pits or running up and down the infield. It seemed to be running out of fuel. I replaced everything between the tank and the carbs, but haven't tried t12 yet.

So far, I am signed up for the basics class.

How that goes will determine much of the rest.

One step at a time.

Get The Fuck Out of here.....

Are you shitting me.. Way to go Jason!!!!!!! You racing the CBR or the Wing? :P

Signing up for the basics course is easy... Only a valid credit card is required.

There are plenty of aspects of this thread which are still true.

I'm actually still more comfortable on the wing than I am the CBR. I'm still waiting on that race class the requires factory stereos. Plans for Friday don't include the GL :).

This post still applies. :hellyeah: I'm pumped for next weekend. And my candyass is just doing another track day.

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Originally Posted by tsorfas

Love how the official clarified everything about the topic and people still developing theories

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No theories. Just asking questions. I am half irish and a professional inganeer by day. I'm practically designed to be a pain in the ass. :mrgreen:

Ultimately rules are rules. You pay to play or gtfo. Ain't even my game anyway.

John, you NEED a helmet fan. Fuck what everyone else says.

Bubba I was directing anything to you. I find it super entertaining anyways