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90s Apache Tomahawk sale

Early/Mid 90s Apache Tomahawk rolling chassis.Made by Apache Constructors Wantirna South.I have owned this since 1994.40mm axle.Old MG yellows with little use.Spare wheels, hubs, bars and pads.No…Continue

Started on Tuesday

2013 FA X30 package sale
1 Reply

2013 OTK Fernando Alonso Victory 30mm chassis.IAME X30 125cc water cooled electric start.New never run Tillotson upgrade carb.Full engine rebuild approx 11 hours run time ago.New magneto two race…Continue

Started this discussion. Last reply by ben marshall Jul 11.

JC kart manufacturer

Is JC kart a Parolin chassis?

Started Jun 26

Do DFMs have a narrow working psi window
5 Replies

Sorry for another DFM question.Do DFMs have a very narrow working window for pressure?Very occasionally I find a pressure that seems to make the rears grip up and feel like chewing gum on the…Continue

Started this discussion. Last reply by Michael Jones May 3.

 

ben marshall's Page

Latest Activity

ben marshall replied to Callum Fry's discussion Kart parts - clean out
"Where are you located?"
Dec 30, 2017
ben marshall replied to Joe Torcasio's discussion What is happening to Karting Racing Participation?
"Joe I think there are too many classes to. I don't see the need for a restricted class of any kind really. I see kids racing in Europe and US with X30 though im not sure if they are restricted."
Nov 27, 2017
john learmonth replied to ben marshall's discussion Older chassis going soft
"Hi wayne, That (below) doesn't describe my opinion on this. I think the material (i.e. particular grade of steel) is not very important other than how it affects longevity of the chassis, or axle. I think that the OD and wall thickness of the…"
Nov 23, 2017
wayne gilby replied to ben marshall's discussion Older chassis going soft
"I remember the good old days when axles only came with one wall thickness and hardness . We all set up a kart around what we had and all went well . I always wondered why axle hardness came into the set up . I remember when all we had was the 25mm…"
Nov 23, 2017
john learmonth replied to ben marshall's discussion Older chassis going soft
"It's interesting that some manufacturers seem to use 'hard' and 'soft' to describe axles with different hardness materials but the same wall thickness, and others have axles described in a similar manner that have different…"
Nov 23, 2017
john learmonth replied to ben marshall's discussion Older chassis going soft
"Yes. Regards, John."
Nov 23, 2017
john learmonth replied to ben marshall's discussion Older chassis going soft
"You won't be surprised that I tend to agree with you, though lots of credible people don't (agree that axle material hardness has no affect on axle flexure, or something else more mysterious and defiant of description).  I'm with…"
Nov 23, 2017
john learmonth replied to ben marshall's discussion Older chassis going soft
"Yes of course, springs do 'sag'. I don't dispute this, but it does not mean that they get either more or less stiff as a result. The Modulus of Elasticity (i.e. stiffness) of any steel is unaffected by 'sagging'. This is so…"
Nov 23, 2017
Stephen Kerwood replied to ben marshall's discussion Older chassis going soft
"It is interesting also that some manufacturers refer to their axles in tensions."
Nov 22, 2017
Terry Sheedy replied to ben marshall's discussion Older chassis going soft
"Stephen, I am thinking of it as a spring. And as the chassis discussion has suggested, all else being equal, the hardness of the material matters no more that a couple of %. Whereas wall thickness makes a huge difference to the spring rate, and also…"
Nov 22, 2017
Stephen Kerwood replied to ben marshall's discussion Older chassis going soft
"Ahh the tension in this discussion, google mr finks old kracer vids if you can find the 1 regarding axles. It takes it from retarded engineer to normal human speak the best way ive ever seen it explained. Think of it as a spring…"
Nov 22, 2017
Stephen Kerwood replied to ben marshall's discussion Older chassis going soft
"Ever seen a spring sag????????"
Nov 22, 2017
Terry Sheedy replied to ben marshall's discussion Older chassis going soft
"Slightly off topic, but could someone now explain to me the difference between a hard and soft axle of the same external  and internal diameters and length? As to performance, and why. Because from the above discussion, you have all proved…"
Nov 22, 2017
john learmonth replied to ben marshall's discussion Older chassis going soft
""Just going off' is what I have some difficulty believing. I've never experienced this, that I am aware of. If it happens, then what causes it to happen, what is the mechanism? If we assume that it is the stiffness of the chassis (or…"
Nov 22, 2017
Ben Coleman replied to ben marshall's discussion Older chassis going soft
"True.  Many (most?) ultralights etc. Cheers Ben"
Nov 22, 2017
Stephen Kerwood replied to ben marshall's discussion Older chassis going soft
"I find a chassis is good until 1 of 3 things happen. Cracking or heavy wear of frame rails. The kart gets bent or twisted and you cant get it back quite right or it "moves" as such. Scales and alignment will highlight this as Ian…"
Nov 22, 2017

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