tom7 Posted July 7, 2006 Share Posted July 7, 2006 At a recent test session, as the speedo reached the 3rd digit , I experienced a vibration from the rear end. The tyres are new and the wheels recently balanced, is there anything particular I should pay attention to or is it just a case of spanner checking all the fixings on the rear suspension and the diff mount. Anybody had a similar occurance Tom Link to comment Share on other sites More sharing options...
Myles Posted July 7, 2006 Share Posted July 7, 2006 Never noticed it on mine. At Vmax (130ish with aeroscreen), I've not had any excitement in that area... Project Scope-Creep is live... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
tom7 Posted July 8, 2006 Author Share Posted July 8, 2006 Well I spanner checked everything and all I found was that the rear ARB was disconnected at the chassis end. I cannot remember disconnecting it ever, so either the vibration has wound out the fixing or that was the cause I'll try it tommorrow on another private test session to see if that's the fix. Other than that, I'm stumped. Any other takers? Link to comment Share on other sites More sharing options...
shn7 Posted July 9, 2006 Share Posted July 9, 2006 Prop shaft? A few people seem to have mentioned problems of vibration at certain rpm (IIRC) and traced it to wear in the prop shaft UJ's. Steve. Not forgetting Percy the Polar Bear Link to comment Share on other sites More sharing options...
Rob Walker Posted July 9, 2006 Share Posted July 9, 2006 Buckled wheel rim or the old problem with the edge of the rear discs hitting the calipers when hot. Check that you have a minamum of .060" between the lip of the discs and the inside top face of the calipers. CC sold a batch of discs that were 3mm too big on diameter and when they expanded when hot they hit the caliper . Link to comment Share on other sites More sharing options...
stevefoster Posted July 9, 2006 Share Posted July 9, 2006 A can of tyre foam to repair a slight air leak sent my wheel completely out of balance. such bad vibe that at 70 my vision was starting to blurr - Yeah I know, always read the label. "use for temp fix and limp to nearest tyre place for proper fix" 😬 - just a thought. Hants (north) / Berkshire club here Area meeting pics here My Racing here Edited by - stevefoster on 9 Jul 2006 18:49:43 Link to comment Share on other sites More sharing options...
tom7 Posted July 9, 2006 Author Share Posted July 9, 2006 As the vibration is speed related not revs related I've discounted the prop as it will achieve the same speed in each gear. Wheel out of true is a possibility (they're Barnby's) so the plan is to give it try with my trackday minilites. Failing that I can only assume driveshaft or hub bearings - Is there anything I can check for without taking the hubs / dedion ears off ?? Link to comment Share on other sites More sharing options...
Grubbster Posted July 9, 2006 Share Posted July 9, 2006 Prop won't achieve the same speed in each gear will it - so don't discount it yet! Roadsport build photo's here Le Mans 2004 photo's here Link to comment Share on other sites More sharing options...
Jason Plato Posted July 10, 2006 Share Posted July 10, 2006 maybe the tyre fitting place didnt ballance them properly or you have lost a wheel weight 🤔 I would check this first as the problem only came about after you fitted new tyres 🤔 here is C7 TOP South Wales AO Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now