Robb
New Member
Posts: 11
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Post by Robb on Nov 23, 2012 17:53:04 GMT -5
Some tips for running your sprint kart in the dirt.
Raise the chassis to the highest position.
Make sure the seat is level or higher than the bottom of the chassis rails.
Take off the front plastic bumper if it is too low to the ground.
The following are estimated starting gear ratios for various engines. Use what gears you have to get close to the following ratios.
Clones - 5.0
F200’s - 6.0
WF - 5.4
Tires dirt tires, rain tires or slicks All seam to work well - just run what you have. I use 6” diameter wheels with large dirt tires and haven’t found any traction advantage over smaller wheels with rain tires or slicks.
Put a couple of number panels or a cardboard panel cable tied in front of your engine to help keep the dirt off of your engine.
Put an old sock over the air filter secured with a rubber band to reduce dirt in your engine.
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Post by scoots27 on Dec 2, 2012 20:59:54 GMT -5
I'm back!------2012 Dixon Speedway,Speedway Open class Champion scott smith #27
I did this with my 40hp Vampire 250cc on one of my 026 Invaders (sprint kart).
Thank you, scott smith
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Post by Brad Wunder on Dec 3, 2012 11:13:14 GMT -5
Congrats Scoots! Now stop playing in the mud and get back on the asphalt where ya belong. LOL
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Post by scoots27 on Dec 3, 2012 15:28:00 GMT -5
Theres no racing for my f-200s or my Vampire 250 on asphalt and I don't want to go a little bit slower. I'm thinking we all know how I feel about spec class racing or racing when i'm the only one in the class, besides the entry fees are too high with no hope of getting anything back at the end of the day. It's not that the money is very much, but it's nice when the track pays your next entry fee and maybe alittle bit more(beer funds).
Thanks, scott smith
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Post by Brad Wunder on Dec 3, 2012 22:02:26 GMT -5
I know Scott, I'm just playing with ya.  |
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Post by Simon on Dec 3, 2012 23:59:34 GMT -5
I'm back!------2012 Dixon Speedway,Speedway Open class Champion scott smith #27 I did this with my 40hp Vampire 250cc on one of my 026 Invaders (sprint kart). Thank you, scott smith Congrats on the championship Scoots. That Vampire is a killer motor. |
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Post by RichH on Dec 4, 2012 13:29:57 GMT -5
Congradulations Scott. That seemed like a long season. How many races in a season? When do you guys start practicing out there again?
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Post by scoots27 on Dec 4, 2012 15:29:09 GMT -5
Thank you all,
Rich, we run a 14 race season with one drop starting in the end of March, or the start of April throughthe end of September with practice days most of March(on the weekends). There is racing all winter long if you check the web site at---dixonspeedway.net---
There seems to be open track time after almost every race if its not too for past your bed time.
Why not come out and Practice Racing at the next event-- it's not like the sprint tracks.
Brad, we race on packed clay not mud like the MC tracks. no mud flaps here
thanks, scott smith
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Post by paullandry on Dec 5, 2012 14:06:02 GMT -5
Our open class has been getting alot of attention and a good car count as of late. It does not take a high dollar engine to compete, just some ingenuity and the desire to go fast. I just picked up aatk dirtbike with a rotax 250 on it for 500 fires up first kick every time. This is the same motor terry ives uses for superkarts. He has all the mounts and says this motor is 50 hp stock.
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Post by paullandry on Dec 5, 2012 14:20:06 GMT -5
Oh yea its for sale cheap to any nfra guy who wants to come race a unlimited kart at cora speedway
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Post by paullandry on Dec 5, 2012 15:00:14 GMT -5
Braaaaaaaaapppp! Attachments:
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Post by scoots27 on Dec 6, 2012 0:58:51 GMT -5
Putting that pipe on a kart is gona be funnnn
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Post by paullandry on Dec 8, 2012 1:36:11 GMT -5
thats why is said you need ingenuity lol .....this is the same motor mounted on a open. Attachments:
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Post by paullandry on Dec 8, 2012 1:37:57 GMT -5
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Robb
New Member
Posts: 11
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Post by Robb on Dec 8, 2012 19:39:44 GMT -5
Dirt Track Kart set up information from Scott Smith
#1; set up for dixon, or any track---Keep it as narrow as passable especially the rear.If the moter gets in the way of moving the right rear tire next to the frame, you need to move it forward with a longer chain or a jackshaft. the latter will give you better gear ratios witch are determined by how many revs you want to run.
#2; No rocket science here. Biggest change will be with which size tires you race with. On my 250,on slicks (11x8.10-6) with a roll out of about 34.8 or so I will run between a 5.75 and 5.90ish gear depending on hookup. With treds,(12x9-6) at about a 36.5in roll out I run a 6.30 to a 6.90 gear, targeting about 11700 to 12000 rpm.
#3; I'm doing this on a modified Invader straigt rail chassis. I run allot of cross weight (LR+RF divided by total weight) by almost sitting on the LR and using a little 10x4.5-5 on the LF.
An offset chassis, when set up and driven well will have a higher corner speed and driving the corner is faster than sliding it around like a winged outlaw kart
#4; Tires are everything!!!!! and the track changes lap to lap
When the track is moist you cant beat a soft tire like a 11 or a 22, when track gets dry and hard a 33 or44 or even a 55 will last
We at Dixon and most tracks race 20 to 30 lap mains and 8 lap heats from rolling starts. I run slicks on the front always and will run treds on the rear on sandy or non packed tracks Track conditions will dictate tires as well as gear ratios. I've always run my rear tires at no more than 6lbs of air.Slick sizes,LF 10x4.5-5 RF 11x6-6 or 11x7.10-6 LR 11x7.1-6 or 11x8.1-6 RR 11x8.1-6. I like to run about 3/4" of stagger in the rear. When it comes to treds, I will run 12x9-6 on both sides with about an inch of stagger.
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