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Re: Low powered Datsun.. Normal?
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i used to rev my stock a12a till 6k at second, and 5.5k at third. awesome!

Posted on: 2011/6/20 13:42
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Re: Low powered Datsun.. Normal?
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So I've been tinkering with it, because it doesn't seem to have much power past 4K, and I readjusted the timing, and spent an hour setting it by a single degree at a time to find the motors sweet spot, and the thing really roars all the way up to 6K now! There's a lot more midrange power out of the old girl.

I played with the vac advance a little bit, trying to hook it up, and strangely, it seems as if under low load the engine misfires horrible around 2-3K, but if I gun the throttle it will rev like an indy car... weird. Video coming.

Posted on: 2011/6/22 16:26
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Re: Low powered Datsun.. Normal?
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glad to hear that!

does your vacuum diaphragm at the dizzy leaked?

Posted on: 2011/6/22 16:32
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Re: Low powered Datsun.. Normal?
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Well, thats a good question. I actually have two ports on the dizzy. not sure how common that is on models sold outside of the USA, but further research shows one is a cold advance, and warm advance.

The one I'd use would surely be the warm advance which doesn't leak under vaccum.


I've had the dizzy apart before, and cleaned every inch of it. Everything operates as it should... runs perfect without the advance hooked up..



http://www.youtube.com/watch?v=g_fElDXvr2Y

Posted on: 2011/6/22 16:41
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Re: Low powered Datsun.. Normal?
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Quote:
under low load the engine misfires horrible around 2-3K, but if I gun the throttle it will rev like an indy car


The vacuum advance is leaking
* Nearly all do after 30 years
* there is no vacuum when you gun the throttle
* Vacuum leak will cause misfiring under part throttle

The 2nd port is a vacuum retard, effectively.

Just plug the hose. You do not need a vacuum advance.

Posted on: 2011/6/22 19:33
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Re: Low powered Datsun.. Normal?
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Got it! I must not be able to produce enough vacuum by myself to be able to tell theres a leak.



Timed it some more and the thing really hauls now! I'm extremely happy with it.

Posted on: 2011/6/22 20:09
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Re: Low powered Datsun.. Normal?
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Quote:

metalmonkey47 wrote:
Well, thats a good question. I actually have two ports on the dizzy. not sure how common that is on models sold outside of the USA, but further research shows one is a cold advance, and warm advance.


now my years old question of why some dizzy i found here have two instead of one port for the vacuum advance answered .

Posted on: 2011/6/22 20:20
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