• Hi Guest!
    You can help ensure that British Car Forum (BCF) continues to provide a great place to engage in the British car hobby! If you find BCF a beneficial community, please consider supporting our efforts with a subscription.
    There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Subscribers don't see this gawd-aweful banner
Tips
Tips

adjustable trunnion

Share this page

maxwedge5281

maxwedge5281

Jedi Warrior
Country flag
Offline
i just received an ad from healey spares advertising adjustable trunions for big healeys. i have seen them mentioned on the forum before. are they really worth the price to improve steering. the ad did not mention how much adjustability they have but for a street car driven regularly would it be worthwhile to consider....they are about 150 us dollars for a set.
 
I have them on my BJ8; I think they're good for about 1.5deg of camber change, max. That price seems high, I think I paid about half that--many years ago--but you might want to check around.
 
These can be overkill in the price dept. British Car Specialists sell rubber/poly upper trunions* with an offset hole for much less than the quoted above. Suggest giving them a call before buying from across the pond. You insert these for the maximum negative camber and forget them. It's not necessary for them to be adjusted.

*Addendum: I meant upper trunion bushings.
 
Last edited:
After reading Steve's comment, it occurred to me I may have been off base. I was thinking of adjustable trunnion bushings; does HS have something different?
 
here is a pic that was with the ad....i dont know if they have more adjustability than those with the rubber bushings....
 

Attachments

  • 96688b14-dd06-4c9a-bb6c-37af321cd786-1.jpg
    96688b14-dd06-4c9a-bb6c-37af321cd786-1.jpg
    18.3 KB · Views: 146
maxwedge5281 said:
here is a pic that was with the ad....i dont know if they have more adjustability than those with the rubber bushings....
Click to expand...

Probably not. The bushings are only about an inch diameter on the inside; not much room to create the offset. Those do look to be nicely made, though, and probably worth the money.
 
I installed something similar - possibly identical - to the above from Cape - which required modifications in order to fit. The taper on the bronze bushings had to be turned down in order for them to seat properly in the upper trunion. My machinist also cut a lengthwise oiling groove in the eccentric barrel and a threaded hole for a zerk. (Allen screw in photo)
Once you install one of these you'll be surprised at how little camber adjustment it provides. IMO, not worth the money. Especially if you have to return it.
attachment.php
 

Attachments

  • CapeTrunion.JPG
    CapeTrunion.JPG
    146.4 KB · Views: 222
attachment.php

Never understood why: "A" is not a knife-edge, thereby maximizing diameter "B", adding to offset "D", and "C" is not effectively zero, thereby maximizing offset "D".
 

Attachments

  • UpperTrunionDimensions.jpg
    UpperTrunionDimensions.jpg
    15.7 KB · Views: 196
Way back when: I hadn't had my mill for very long when I was doing little projects to familiarize myself with its capabilities (and limitations). I turned these out in both UHMW and bronze; I've had the UHMW ones fitted ever since. They still are knock-free, so their internal bore hasn't worn much, if at all.

bush14a.JPG


bush18a.JPG


I still have the bronze ones, in the same dimensions show (or in other words, unfinished to final size) and will keep them as a backup, should the UHMW ones wear out.

The hex is 1-1/16" and with a suitably thinned wrench, the camber can be adjusted by merely loosening the stock upper trunnion bolt. I set them to -1.0* (negative) camber, but I think they'll go just under 1.5* max.

IMG_0204.JPG


The trunnions on BN6L-942 were bored straight-thru, equal to their original maximum bore size (at the ends).

I had also embarked upon making some upper trunnions, facilitating adjustment and clamping, but they turned out to be too darn heavy!

trun17a.JPG


I did get them mostly finished, but can't seem to find the pictures; next time I turn up one of the "billet trunnions" I'll grab some pices then...
 
Those bushes look like a nice little project, good work. What is UHMW short for ? I have a small mill and lathe so think I will have a go too.

Andy
 
Andy:
Ultra High Molecular Weight Plastic---NOT!! Teflon----:eagerness:
 
steveg said:
AHSpares sells these in Nylon for #21.50 + VAT; in the US, BP Northwest sells similar for $18.00:
attachment.php
Click to expand...
Had those been available a dozen years ago, I wouldn't have wasted the time to make my own__not to save $20.00__that's for sure! ;)
 
You're right of course but we all like these little garagist projects...I think. Yes deffo not Teflon...I made a shaft bearing for a water jet powered boat from that stuff once ( when I knew less but thought I knew more) ...very unsuccesfull !!!
 
Had those been available a dozen years ago, I wouldn't have wasted the time to make my own__not to save $20.00__that's for sure! ;)

Yeah!! Randy:
"N" I would not have replaced my front shock plates to set my camber @ 0 degrees either--:highly_amused:
 
Back
Top