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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
LRRS/CCS Expert #820 / RSP Racing / Woodcraft / MTAG Pirelli / Dyno Solutions / Tony's Track Days / Sport Bike Track Gear / GMD Computrack /
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.
Mike K. - www.goMTAG.com - For Pirelli tires, Moto-D tire warmers, and Woodcraft parts
LRRS/CCS Expert #86 / RSP Racing / Woodcraft / MTAG Pirelli / Dyno Solutions / Tony's Track Days / Sport Bike Track Gear / 434racer / Brunetto T-Shirts / Knox / Crossfit Wallingford
R.I.P. - Reed - 3-23-2008
I have most def passed inspection and raced with no caps at all. Lol
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.
Mike K. - www.goMTAG.com - For Pirelli tires, Moto-D tire warmers, and Woodcraft parts
LRRS/CCS Expert #86 / RSP Racing / Woodcraft / MTAG Pirelli / Dyno Solutions / Tony's Track Days / Sport Bike Track Gear / 434racer / Brunetto T-Shirts / Knox / Crossfit Wallingford
R.I.P. - Reed - 3-23-2008
Last edited by OreoGaborio; 08-24-14 at 06:43 AM.
-Pete LRRS/CCS #81 - ECK Racing, TonysTrackDays
GMD Computrack Boston | Pine Motorparts/PBE Specialists | Phoenix Graphics | Woodcraft | MTag-Pirelli | OnTrack Media
The Garage: '03 Tuono | '06 SV650
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.
Last edited by xsiliconkid; 08-25-14 at 09:59 AM. Reason: correction 0.09" not 0.9"
Graham
"If computers get too powerful, we can organize them into a committee — that will do them in"
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.
http://www.amazon.com/Set-Bullet-Val.../dp/B009C9PA96
Metal
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
They aren't mutually exclusive .
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?
LRRS/CCS Expert #820 / RSP Racing / Woodcraft / MTAG Pirelli / Dyno Solutions / Tony's Track Days / Sport Bike Track Gear / GMD Computrack /
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. I'm pumped for next weekend. And my candyass is just doing another track day.
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.
Ultimately rules are rules. You pay to play or gtfo. Ain't even my game anyway.
Bubba I was directing anything to you. I find it super entertaining anyways