Do both carbs have the same viscosity oil in them?
Bob Winslade
1966-1600 Missy
1967-1600 Bender
----- Original Message -----
From: <kendelmccarley@cox.net>
To: <datsun-roadsters@autox.team.net>
Sent: Sunday, October 21, 2007 12:44 PM
Subject: Re: [Roadsters] Differences in carb damper - Figured out
> Okay, answering my own questions here. After posting, I had a few ideas
> on how to debug things. First, I figured out that if I don't thread the
> longer rod all the way in so that it's effectively the same length as the
> original, the carb pistons rise and fall the same way. With that in
> place, the car started and idled, but would stumble on acceleration.
>
> Hmmmm..... why the stumble? Well, in an attempt to find out why, I then
> screwed the longer damper all the way in. The piston with the shorter
> damper was opening much quicker on acceleration, so I stuck a finger in
> that carb against the piston to slow it down. Aha! Now, the engine
> accelerates nicely. Take my finger off so that the piston opens quickly
> again and it goes back to stumbling.
>
> Conclusion? The one damper that came with the car is wrong. Man, oh man.
> These old carbs are so cool. I've messed with SUs on British cars, but
> these, while similar, are different and fun to play with.
>
> Joe, do you have another one of those dampers and caps in your stash?
>
>
>
>
>
>
> ---- kendelmccarley@cox.net wrote:
>
> =============
> I've been working on getting a '70 1600 running that was missing a damper
> and cap from one of the carbs. Joe Russo was kind enough to fish one out
> of his stash to sent me but, after installing it, the car still runs
> poorly. I pulled the air cleaner to check the rise and fall of the carb
> pistons. Sure enough, one of them was much more resistant to movement
> than the other. When I switched the dampers from carb to carb, the one
> with Joe's part was harder to move.
>
> The only difference I can see between the two is that the one Joe sent me
> is around a sixteenth of an inch longer, putting the damper part farther
> down into the carb. How does this make a difference? If I mod the new
> part to be a bit shorter (pull it out of the cap, cut it down, and
> re-insert into cap) will that cure this problem?
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