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Author Topic:   Tire Grinding
jammin
Administrator
posted November 05, 2002 01:20 PM
What are you trying to accomplish on your tires by grinding them?


zeroracing
Member
posted November 05, 2002 01:38 PM

If you use a coarse enough disk with the right motion it will also leave little grooves in the tire surface. This supposedly will help let heat out and keep the tire from glazing sort of like siping would. I know its not as good as siping but in a class that doesnt allow siping it is better than nothing.

If nothing else grinding will remove the glaze from a tire leaving fresh rubber to race on just like a new tire. Helps get a few more nights out of a tire. We used to run tires maybe 1 or 2 nights then flip them and get 1 maybe 2 more nights out of them and now we are running them 5-6 nights total after we started grinding regularly.

outlawstock17
Member
posted November 05, 2002 03:46 PM
i'm tryin' to pass the guy i'm grindin' my tires on!

is that what you meant?



ford5
Member
posted November 05, 2002 05:32 PM
tire grinding is very affective, if done properly and throughly, in fact it is being 'outlawed' at many tracks.


George Gilliland
Member
posted November 06, 2002 08:43 AM
There are two reasons to grind the tires, first and most important is to remove the feathered edge that sticks up on the inside edge of all the tread. This allows the tire to lay flatter and grip a dry slick track better. The other reason is to rough the surface slightly. The amount taken off is very limited and the effects are most helpful for the start of a long race. If you put your hand on a tire and slide it accross the tread, from side to side you will feel these edges sticking up slightly. On the back tires there is an additional feathered edge from spinning, which also needs to be flattened.


PEDDLER
Member
posted November 06, 2002 06:54 PM
Years ago we used a belt sander to remove the glaze and feathered edges. I like the belt sander better that a grinder.


gphillips
Member
posted November 07, 2002 03:14 PM
I like using a beltsander better than grinding too. Excessive heat is the enemy of a tire and sometimes grinding them will put too much heat in a tire. We have recently started using a DA to "buff" our tires and have had good results with this.


FS93
Member
posted November 07, 2002 05:58 PM
What grit are you all using when you are grinding?


PEDDLER
Member
posted November 07, 2002 07:16 PM
You'll have to play around with what works the best for you. Start with 80 grit.


dirtbuster
Member
posted November 08, 2002 08:22 AM
Last year we used something along the lines of 10 grit disc and it worked the best.

The coarser the better.

old racer
Member
posted November 08, 2002 08:56 AM
DA sander with 40 grit paper,works for me i'm useing D55 tires.

[This message has been edited by DMA Racing (edited November 08, 2002).]

dirtbuster
Member
posted November 08, 2002 12:52 PM
The 10 grit disc i talked about earlier is not like a regular sanding disc. Its not a disc of sandpaper on a backer pad. It is a solid metal wheel with pieces of abrasive stuck to it. That is no typo it really is like 10 grit. They are made just for grinding tires in order to put scuff marks in them. We use it on a 7 inch variable speed grinder as slow as possible and it works great. You dont have to worry about you sandpaper pads wearing out.


dluna
Member
posted November 08, 2002 05:23 PM
dirtbuster, where can we get these bad boys?!?


dirtbuster
Member
posted November 11, 2002 12:43 PM
We bought ours through a friend..not sure where he got it though. I know they were real big in eastern IA last year with the Late Model guys so there has to be somebody aournd that carries them.

I will do some checking and try to find out where to get them and let all of you know if you are interested.

zeroracing
Member
posted November 11, 2002 12:58 PM
The discs mentioned in the previous post are exactly what i am talking about. There is a picture under tire tools.

If you try one of these let me warn you that your tires need to be clean and cool when you use it. WE try to knock off any mud before grinding and we let them cool before we grind . Also i wouldnt reccomend using them on a single speed grinder. They can get wicked to control. We use them on a variable speed set as slow as possible.




#28
Member
posted November 12, 2002 11:01 AM
It does last quite awhile. I know the one we used every night this season and let several others borrow still looks good and i am sure will get used next season. I see no reason to get a new one.

When we were using paper it seemed like we went through a disc every time we did a set of tires.

fr1
Member
posted December 03, 2002 01:21 PM
Yes they do last, an average racer should be able to use one all year.


Racer14K
Member
posted December 03, 2002 03:36 PM
What diameter are they fr1?


fr1
Member
posted December 10, 2002 10:31 AM
7" diameter with a 7/8" hole for arbor.


fr1
Member
posted January 16, 2003 12:31 PM
These glean the glaze off without smoking the rubber and hardening.


T/10
Member
posted January 17, 2003 08:16 PM
I ran a car this weekend for a guy who had nothing but old hard tires. After about 1 hour of grinding he had all new ones. IT worked great!


fr1
Member
posted November 16, 2003 04:20 PM
check out the nail head grinders


Greggie
Member
posted November 16, 2003 08:35 PM
BIG CHEATERS!!!

Sorry guys... I just had to do that.

Greggie

zeroracing
Member
posted November 16, 2003 11:31 PM
Zero, that depends on your Tech Man.


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