View single post by Tom Bradley
 Posted: 02-09-2020 09:53 pm
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Tom Bradley


Joined: 07-15-2013
Posts: 169
chrisl wrote:
Thanks gents, it will be interesting to see what the difference between the two types of carby on the same car will be

I hope you post your the results. I tried a comparison between SAE20 and 20W-50 and could not tell any difference. Maybe I am not that perceptive.

Besides the recommended damper oil, I have noticed that the air valve return spring in the JH is much longer and stiffer than in TR4's or TR6's even though the basic carb is the same. It seems like some sort of balancing act is going on here. I wonder if the differences are due to maximizing performance or simply adjusting to whatever oil is most easily available. I read in one of my carb manuals that the springs are specific to the particular carb and should not be swapped out.