[Roadsters] Differences in carb damper - Figured out

[Bubba]

Do both carbs have the same viscosity oil in them?

Bob Winslade
1966-1600 Missy
1967-1600 Bender

----- Original Message ----- 
From: <kendelmccarley at cox.net>
To: <datsun-roadsters at 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 at 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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