Ron,
His dwell is fine. The standard dwell value for roadsters is variously
stated in the Nissan manual as 50-54 degrees, 49-55 degrees and 50 to 55
degrees. These values are consistent with a point gap of 0.018 to 0.020 for
the Hitachi distributor. I try for the lower end of the range since the
dwell increases as the rubbing block wears.
Gary
----- Original Message -----
From: "Ronnie Day" <ronnie.day@gmail.com>
To: "Roadster List" <datsun-roadsters@autox.team.net>
Sent: Monday, October 05, 2009 11:17 AM
Subject: Re: [Roadsters] Was Engine test results, suspect distributor
>> Dan McHatton
>>
>> I think my problem is my distributor. I found another cap and rotor then,
> went
>> to grab my coil wire from my old Chevy to have a complete set of fresh
> plug
>> wires. While I was there, I checked the play in the Chevy distributor
> rotor.
>> When you twist it lightly and let it go, the springs snap it right back
>> to
> the
>> home position. When you try the same trick on the Datsun distributor, the
>> rotor has lots of slop in it.
>>
>> I'm thinking my distributor is worn and causing my backfire problem. The
>> engine idles smooth as glass. Engine timing is 16 BTDC on the nose. Dwell
>> angle 51 degrees. As soon as you rev it up, it misses and backfires.
>>
> First, I'm pretty sure even without checking that your dwell is way off.
> IIRC, it should be around 30 degrees and it should be set before you set
> timing. Then the timing mark should remain stable at any RPM as you rev
> the
> engine. Yes, it should move (smoothly) as RPMs increase but any time you
> hold an engine speed the mark should not jump around, but stay in one
> spot,
> until you change engine speed again. There are a number of reasons for
> timing instability, including play in the distributor shaft or drive
> gears,
> a breaker/advance plate that's worn out, etc.
>
> HTH,
> Ron
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