Ital live axle upgrade

39 posts / 0 new
Last post
Graeme Smith
Offline
Last seen: Never ago
Joined: 17/04/2014
Ital live axle upgrade
Caterham Graduates have comissioned Rakeway to produced a modified Ital axle along the lines of the Morgan race axle they already do. ---------------- The current single rolling element bearing is replaced by a double rolling element bearing. A new hub extends within the bearing. A shoulder on the hub contacts the outboard end of the inner bearing race. The new bearing spacer contacts a shoulder on the halfshaft. When the halfshaft end nut is tightened the inboard end of inner race of the bearing is then held against the new bearing spacer. The outer bearing race is trapped between the new bearing housing and the new bearing collar. The outer end of the internal bore of the new hub is splinned and driven by a splines on the halfshaft. The inner end of the hub bore is a sliding fit onto the hub. The inner shaft seal remains unchanged. A new outer seal is fitted in the recess outboard of the bearing and runs against the new hub. Result - The keyway (currently the failure initiation site) and taper are eliminated and the halfshaft remains at full diameter for its full length. Bending forces are transmitted through the hub to the bearing rather than as currently from hub to the halfshaft and on to the bearing. Bending stresses in the halfshaft are minimised. The halfshaft will effectively transmit only the drive torque. No modification are required to the existing axle tubes. The brake backplate bore has to be increased to clear the bearing. ---------------- We are placing a bulk order for these axle modifications early next week at £625 +VAT for Caterham Graduates; the price will significantly increase after this initial run. If you are interested in purchasing this modification kit please email me ASAP (although I'm away at Spa over the weekend). Edited by - graeme smith on 30 Sep 2009 18:51:19
guilleracing
Offline
Last seen: Never ago
Joined: 17/04/2014
Hi, this seems very expensive for a couple of bearings, or am I missing something. A ford axle conversion would cost the same with E.Bay. Can you tell me exactly what is in a kit of parts for example? I would love to upgrade my car if there was a simple kit I could buy. Cheers, Greg.
Golf Juliet Tango
Offline
Last seen: 4 hours 42 min ago
Joined: 17/04/2014
I agree. Well out of my range. Democratic dissent is not disloyalty, it is a positive civic duty.

Stephen

Democratic dissent is not disloyalty, it is a positive civic duty

guilleracing
Offline
Last seen: Never ago
Joined: 17/04/2014
Just as an aside, I did investigate upgrading this axle through an engineering contact a while ago. EN 39 heat treated shafts were about £100.00 each and alloy splined internal hub about the same. Double row bearings cost abot £50 the pair. This would hve made up an axle to take 250bhp reliably. These prices would have come down a bit with a bulk by. Still, I would be interested to know what was available in this offering.
bstark
bstark's picture
Offline
Last seen: 1 month 3 weeks ago
Joined: 17/04/2014
Wow - that was way more than I was expecting to see. Shame, but I can't afford that... Bob Stark Supersprinter
James_Russell
Offline
Last seen: Never ago
Joined: 17/04/2014
Graeme, I'll be the first on the BC list then! I'll have a word with Nick Haryett at work tomorrow and ask him where my deposite needs to be directed. For those of you who don't know, one of the the main purposes of this modification is to satisfy the proposed 2011 technical regulations of the classic graduates racing club, which are set to make it mandatory. Understandably, the club hosts are beginning to take exception to wheels breaking off, and a few of these failures really did present a risk to other competitors. I am sympathetic to people like graeme (who I beleive hasn't had a recurring half shaft problem) as there seems to be a direct correlation between the frequency of failures and the severity of curb use (on the circuit). As far as I know all the other potential solutions were explored, including one particularly disasterous attempt by Quaife, and this method (pending successful track testing) was considered the best. As I understand it, the kit isn't just bearings- it comprises a new pair of half shafts, a new hub, hub spacer as well as bearings and seals. This solution also eliminates lateral loading on the bearings. Also consider how servicable this solution would be compared to any individual one-off kits. -James 1999 VX 8v (Q41 ACF)
guilleracing
Offline
Last seen: Never ago
Joined: 17/04/2014
Still would be interested to see from the original poster what you actually get for your money as this still seems a lot of money.\" class=\"smiley\" />
GregP
Offline
Last seen: Never ago
Joined: 17/04/2014
Hmm, this poses a quandry. There is no way I can afford this upgrade at present but presumably by not doing it I will significantly affect the resale value of my car as it would rule out the car returning to grads.
Offspring
Offline
Last seen: Never ago
Joined: 17/04/2014
Eeeep, thats short notice Graeme, when and how would you need the cash and what might the lead time be? As Greg, I'd like to keep my car in Classic Grad spec + I'd like to reduce the risk of high speed breakage - it's been quite a tight couple of months, I'll see what I can do to get the money together. Edited to say : Best of luck at Spa Cheers Al Edited by - Al on 1 Oct 2009 21:51:30
Graeme Smith
Offline
Last seen: Never ago
Joined: 17/04/2014
quote:Can you tell me exactly what is in a kit of parts for example?
The kit consists of two new design halfshafts, two new design hubs, bearing carriers and bearings, I believe. The upgrade may not be mandatory in Graduates in the near future, but after two halfshaft failures at Spa at the weekend, they are going to be highly recommended. (Just replacing a new halfshaft and a used hub is ~£150, never mind damage caused - it inevertably takes out the rear wing - and lost track time).
PAC
Offline
Last seen: Never ago
Joined: 17/04/2014
Std. replacement parts from Redline are -from memory-: Shaft: £120ea Hub: £140ea Bearing kit: £30 So about £580 for std. parts. I think that's including VAT tho. Still not a mile out, and if it can handle 250BHP Hmmmmm.......