The rocker box. (reader alert, section unfit for originality bum eyes, and professional moaners in general !
)
Although I have the original rockerbox I wanted to find out if I could use later rockers.
Hmmm, it looks like they would fit.
First task was altering later spindles, the diameter did not change over the years.
I used for the test a worn one, (no usable Ariel parts are being hurt in the test process) the one in the centre only needs shortening.
To get them fitting the repro casting, (from Karol) it needs some alterning.
as the (outside) rocker arm sit under an angle, the slot in the box needs to get wider.
Also a small amount needs to be taken away around the inside arm .
view from underneath :
Using rocker arm springs as the later rockers are shorter overall.
Ah! and there is always a 'but'.....
I found that the later ex rocker has a different angle ! (did you know that ?)
I assume it's because a twin lobe cam has the position of the pushrods not in line.
(but a '28 also has a twin lobe......making a different angle at the ex rocker arm is perhaps an advanced insight at the factory ?)
With the advent of the single lobe the pushrods went back in to one line.
I can only conclude that the Ariel factory in all it's wisdom decided that the ex rocker arm could stay put.
(I always forget : is with the twin lobe the ex lifter the last one to go on the spindle ? ehhhhhh
)
Anyway, this was a surprise
At the yellow arrow you see that it sits too close.
Fitting the pushrod tube + pushrod jams the plot.
pic shows another ex rocker with paddle for lifter still attached.
Question :
Would it be o.k. to heat the rocker arm and give it a knock in the right direction ??
these parts are -I think- cast with no special treatment, so heating and bending would be o.k.
yours thoughts please !
