Burette's

Jeremy · 04-29-2009, 05:35 PM

Not sure if everyone knows, but you have to be careful when measuring your port and chambers volumes because most burette's will not read the same.
The standard for a class A burette is 1% and a class B burette is 2%. I have checked many and found them to be as much as 1 1/2 cc's different on a 100 cc's. I checked two of NHRA's and they were 0.8 cc's different on a 100 cc's.
This is quite alot on a port volume and depending on which one is picked up may allow you to be legal or maybe not.
So make sure you have a safety margin and don't cut it too close.
Thanks

bill dedman · 04-30-2009, 05:04 PM

That's asinine, that they would manufacture a volume checking device and condone that sort of inaccuracy. All they have to do to refine the accuracy is to move the markings on the tube.... jeesh...

Thanks a lot for posting this. I'll check out which "class" mine falls into.
Bill

FED 387 · 04-30-2009, 06:13 PM

the main difference between a A & B burette is how fine a measurement you want!!!! A class A takes the measurement out to .05 whereas a class B only goes to .10------ sorta like a vernier giving you a reading in .001 and the other one can give you a reading of .0001---- OK------Comp 387

bill dedman · 04-30-2009, 07:26 PM

Thanks for clearing that up; that makes a lot more sense.

Bill

04-29-2009, 05:35 PM	#1
Jeremy Junior Member Join Date: Dec 2002 Posts: 95 Likes: 0 Liked 1 Time in 1 Post	Burette's Not sure if everyone knows, but you have to be careful when measuring your port and chambers volumes because most burette's will not read the same. The standard for a class A burette is 1% and a class B burette is 2%. I have checked many and found them to be as much as 1 1/2 cc's different on a 100 cc's. I checked two of NHRA's and they were 0.8 cc's different on a 100 cc's. This is quite alot on a port volume and depending on which one is picked up may allow you to be legal or maybe not. So make sure you have a safety margin and don't cut it too close. Thanks

04-30-2009, 05:04 PM	#2
bill dedman VIP Member Join Date: Feb 2002 Location: Conway, AR Posts: 1,739 Likes: 0 Liked 6 Times in 4 Posts	Re: Burette's That's asinine, that they would manufacture a volume checking device and condone that sort of inaccuracy. All they have to do to refine the accuracy is to move the markings on the tube.... jeesh... Thanks a lot for posting this. I'll check out which "class" mine falls into. Bill __________________ Bill

04-30-2009, 06:13 PM	#3
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,420 Likes: 529 Liked 333 Times in 180 Posts	Re: Burette's the main difference between a A & B burette is how fine a measurement you want!!!! A class A takes the measurement out to .05 whereas a class B only goes to .10------ sorta like a vernier giving you a reading in .001 and the other one can give you a reading of .0001---- OK------Comp 387

04-30-2009, 07:26 PM	#4
bill dedman VIP Member Join Date: Feb 2002 Location: Conway, AR Posts: 1,739 Likes: 0 Liked 6 Times in 4 Posts	Re: Burette's Thanks for clearing that up; that makes a lot more sense. Bill __________________ Bill