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PostPosted: Mon Nov 26, 2018 3:55 pm 
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Joined: Mon Jun 30, 2008 2:16 pm
Posts: 396
Location: Ansonia, CT
For the past year I've been trying to remedy a timing issue I've had with my 71 240Z. :roll: While I now have it running well at idle with no pinging on acceleration, I do experience a dramatic drop in power at over 5K RPM. It's been bugging me for a while. I've tried replacing the points with Pertronix, adjusting the valves, replacing advance springs, cleaning and the carbs, replacing the plugs, points, condenser, rotor, cap wires, in short eliminating any gremlins I thought could be causing this. No such luck!

I still want to keep the original distributor and the rest of the car as stock as possible, but replacement distributors for the early Z's have dried up and most companies, including MSA won't rebuild them anymore.

I've read many articles on the web from other car clubs and I've now decided, that I will have my original dissy sent to a professional for repair. Advanced Distributors seems like a good choice based on the references I've read. They will rebuild the distributor and re-curve the timing using one of many SUN machines they have with an expected turn around of about 3-4 weeks.

I still suspect that the issue is with the distributor timing. Some time ago I took apart my distributor for servicing and cleaning when I found that it only had one mechanical advance spring installed. I started inquiring whether the original 240Z distributor should only have one mechanical advance spring. Got lots of different answers, most though said it was supposed to have two springs. Apparently, according to Jeff at AD, some older units were sent from the factory with only one spring. Of course over time, these springs wear out and can effect the ignition timing. I've replaced the springs already with two new springs, but have no way of testing to see if the timing curve is correct. My guess is that it's not. :thumbs_down:

I've shipped my "insured"distributor out today to Advanced Distributors in MN. I will let you fellow Z club friends know my progress.

Below is AD's web page for your future reference:

http://advanceddistributors.com/wordpress1/

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John Kish
1971 240Z original owner


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PostPosted: Tue Nov 27, 2018 7:17 pm 
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Joined: Fri Dec 25, 2015 7:39 pm
Posts: 457
Location: Long Island, N.Y.
Good luck John. :thumbs_up: :thumbs_up: :mrgreen:

Howie

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1985 300ZX- GLL Dark Pewter Metallic - Survivor


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PostPosted: Tue Nov 27, 2018 8:01 pm 
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Joined: Sat Feb 01, 2014 9:21 am
Posts: 760
Location: Somers CT
:thumbs_up: :thumbs_up: :mrgreen: GL John

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W.Karl Walton
Somers CT



75' - 280Z - HLS30203249 - #304 Gold Metallic (stockish)
96' - 300zx TT - JN1CZ24d3TX960293 - Black on Black (enhanced)


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PostPosted: Tue Nov 27, 2018 9:45 pm 
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Joined: Wed Apr 09, 2008 5:53 pm
Posts: 12973
Location: CT
Hmmm....what happened to the answer I typed to you?
Why did you delete it John?
WHY? WHY? :x

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1970 240Z


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PostPosted: Wed Nov 28, 2018 10:39 am 
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Joined: Mon Jun 30, 2008 2:16 pm
Posts: 396
Location: Ansonia, CT
Frank,
I don't recall seeing a message from you on this topic? :?

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John Kish
1971 240Z original owner


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PostPosted: Wed Nov 28, 2018 11:02 am 
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Joined: Wed Apr 09, 2008 5:53 pm
Posts: 12973
Location: CT
Just kidding. I wrote that Bryan Little used to blame the new gasoline additives on high-speed breakdowns, and recommended a mild booster.

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1970 240Z


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PostPosted: Wed Nov 28, 2018 11:09 am 
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Joined: Mon Jun 30, 2008 2:16 pm
Posts: 396
Location: Ansonia, CT
One further note, I will be checking the timing marks on the end of the cam shaft sprocket to make sure the cam is in proper position on the chain relative to TDC on the crank. I'm wondering if there may also be enough stretch in the chain to cause a timing issue.

And thanks Frank for clearing up the "missing message" thing. I'm easily confused these days. :roll:

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John Kish
1971 240Z original owner


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PostPosted: Wed Nov 28, 2018 1:16 pm 
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Joined: Sat Feb 01, 2014 9:21 am
Posts: 760
Location: Somers CT
:mrgreen: :mrgreen: :shock: :lol:

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W.Karl Walton
Somers CT



75' - 280Z - HLS30203249 - #304 Gold Metallic (stockish)
96' - 300zx TT - JN1CZ24d3TX960293 - Black on Black (enhanced)


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PostPosted: Wed Nov 28, 2018 8:09 pm 
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Joined: Wed Apr 09, 2008 5:53 pm
Posts: 12973
Location: CT
:mrgreen: :mrgreen: :shock: :lol:

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1970 240Z


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PostPosted: Fri Dec 07, 2018 7:57 pm 
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Joined: Fri Dec 23, 2016 7:11 am
Posts: 276
Good luck John. I'd thought you had that issue solved.

I've read good things about Advanced Distributers before. I'll be interested to see how you make out, I hope she ends up running better than ever before.

Jay


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