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Title: hr front end positive camber Post by: FC 304 wannabe on July 13, 2012, 08:37:35 PM hi guys,
I've recently noticed my project car has a reasonably large positive camber on the front wheels. It's a hr front end, torana front rack and is quite low as I believe its running lowered 6cylinder springs with a v8 in the engine bay. My question is , has anyone seen this before? Is something put together wrong, or is it because its so low??? fixes ?? Title: Re: hr front end positive camber Post by: FC 304 wannabe on July 13, 2012, 10:07:32 PM forgot to mention I have hr drum brake axles modified to take vn Commodore disks .
also been researching camber posts on this forum and need more information.. if someone could give me some measurements to take on the wishbone and axles etc. I'm sure I can work out which parts are wrong. p.s. These parts I'm running were recommended by rod at rods racks shortly before he shut down... Title: Re: hr front end positive camber Post by: john253a on July 13, 2012, 11:25:21 PM if you jack the car up from the cross member about 20-40mm doest it fix the +camber
if so then yse its because it to low, how low is it? and if you like it that low you can replace the lower pins to suit with off set bush (like a camber kit in newer car) and they even make make them for the top if you want it even lower, im running mine 40-50mm on front with these pins and have them set @+1, they cost about $120 a pair Title: Re: hr front end positive camber Post by: FCRB26 on July 14, 2012, 07:12:11 AM mine isnt ultra low and it runs drum stubs and my adaptor kit and it took a heap of shims to get it right .
Nearlly to the point of having to massage the subframe and i think i needed a bit longer bolt as well. Pete Title: Re: hr front end positive camber Post by: FC 304 wannabe on July 14, 2012, 07:39:53 AM thanks,
where can I get this offset bush kit john253a? and pete, where do I put shims in to fix the problem?. I reckon putting washers between the top swing arm mounting point and the subframe could pull the top of the wheel in a little... Title: Re: hr front end positive camber Post by: colt on July 14, 2012, 07:42:33 AM Make sure it doesn't have HD lower wishbones. ALL HR lower wishbones have HR stamped into them on the bottom. If it doesn't say HR it is HD. HR are about 1cm longer between mounts and balljoint.
Colin. Title: Re: hr front end positive camber Post by: john253a on July 14, 2012, 10:19:23 AM I gomine from peders,
They fitted and shimed the top, If it lower the 40-50mm you may need the top pin so as less shims are needed, If you google the lowered Hr front end something should up with them Title: Re: hr front end positive camber Post by: mcl1959 on July 14, 2012, 01:11:35 PM Have you put the shims in between the tower and the upper wishbone mount? This is normally where camber is adjusted.
Ken Title: Re: hr front end positive camber Post by: FC 304 wannabe on July 14, 2012, 02:20:09 PM not yet ken.... But I recon that to get it right just using shims on the upper wishbone mounts, I'd need about 2 inches of shims on each point! Scratching me head ??? I think there has to be something installed wrong, or mismatchedparts :-\
Title: Re: hr front end positive camber Post by: FC 304 wannabe on July 14, 2012, 03:08:22 PM ok. Finally got to the car to check a few things....
the camber does become negative when I jack the front end up... I do have "hr" stamped on my lower wishbones... and I threw about 9mm worth of shims behind the upper wishbones and it made a significant difference :) now, I reckon I could go a bit further... Before I get too close to the k frame. does this adversely affect anything with my handling ? Bump steer ? and when I'm putting it together for the final time.. What degree of negative camber should I be trying to achieve when wheels are straight and car is at ride height??? thanks again everybody for your valued input, once again ;D Title: Re: hr front end positive camber Post by: waynos on July 15, 2012, 07:29:02 PM you might have seen my problem in your research................
i have torana stubs and didnt know at the time cause it was bought as an unfinished project thought it was the the hd thing i chopped half an inch outta the top wishbone and welded it back together......... maybe i'm gonna die............... Title: Re: hr front end positive camber Post by: waynos on July 15, 2012, 07:32:42 PM was there any shims to start with?
could be wrong but that sounds like it should be ok to me,as long as nothing fouls and ya aint running outa thread Title: Re: hr front end positive camber Post by: FC 304 wannabe on July 15, 2012, 07:56:17 PM ha! Ha! Waynos.,
I don't think your going to die ! there were no shims in there to start with, but I reckon I'll end up with about 20mm worth in the end. am I right to assume that I can adjust the caster of each wheel by using different amounts of shims between the front and back of each upper wishbone ??? thanks for the feedback, shannon. Title: Re: hr front end positive camber Post by: waynos on July 15, 2012, 08:46:48 PM i'm a fabricator by trade and the engineer passed it so its fine................
as for castor i thought the same at the time but ive hand built a fiat topolino nostalgia altered since then makin it up as we go castor could change minimally but wont make an impact i dont reckon............ speak to a wheel alignment specialist like ya gonna spend some money but dont you'll sort it out......... Title: Re: hr front end positive camber Post by: waynos on July 15, 2012, 08:49:19 PM if anyone has more tech castor advice i cant wait................
Title: Re: hr front end positive camber Post by: ardiesse on July 16, 2012, 11:40:42 AM I got stung by the positive camber problem doing a disc brake conversion on a friend's EH about 20+ years ago . . .
LJ Torana hardware was a lot easier to get than HR, so I used Torana stub axles, calipers and discs with HR control arms and steering arms. And the car had a lot of positive camber. The problem was with the Torana stub axles - they may look the same as the HR ones (bearing adjuster nut thread except), but the steering axis inclination was a degree or so higher for the Torana than the HR, which gave the extra positive camber on an HR front suspension. So I pulled the front suspension apart again, went back to HR stub axles, but kept the LJ discs and calipers, and then I could get the front suspension angles right. (looks back through thread) Are you sure you have HR drum brake stub axles, not Torana ones? You can tell them apart by looking at the thread on the end of the stub axle. Torana stub axles have 3/4" threads (the OD of the thread is the same as the outer bearing), HR stub axles have 5/8" (?) threads (the OD of the thread is smaller than the axle where the outer bearing goes on). That's all I can think of. An HR front suspension will give the correct angles with HR suspension components. Rob Title: Re: hr front end positive camber Post by: FC427 on July 16, 2012, 01:46:43 PM Not sure if you can still buy them but I have ''spindle extensions'' fitted to my front end its just a spacer that goes between the upper ball joint and the stub axle which lifts the wishbone up 2'' will take a picture and post it .....FC427....
Title: Re: hr front end positive camber Post by: colt on July 16, 2012, 05:21:43 PM When we did the front end on my EH racer (EH front end) we fiddled with the wishbone mounts. When screwing the bushes into place you mount the lower wishbone as far forward as possible then mount the upper wishbone as far back as possible. It should be able to be done with a HR front end as they have the metal bushes still. You end up with both wishbones mounted off centre and more castor.
Don't know if it works, but it handles good. Colin. |