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What is this on my 510?


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#1 jcd0402

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Posted 05 February 2018 - 06:52 PM

Hi, I have quick dumb question to ask since I don't seem to understand what the box on the throttle linkage is.
Does any one know what it is?

Thank you

https://imgur.com/a/UkRcK

You know this is a beautiful car; it's still got a good engine but until we get that piece that fixes the engine its not going anywhere.


#2 datzenmike

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Posted 05 February 2018 - 07:46 PM

jdADRoa.jpg

 

 This throttle position switch and a relay, along with transmission switches for certain gear, is used for applying or turning off the second set of points in the distributor to retard or advance the ignition timing to lower emissions.


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#3 jcd0402

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Posted 05 February 2018 - 08:10 PM

 

 

 This throttle position switch and a relay, along with transmission switches for certain gear, is used for applying or turning off the second set of points in the distributor to retard or advance the ignition timing to lower emissions.

 

Thanks datzenmike!!! Guess I don't really have to worry about it since I'm running an L20B with a single points setup, which I'm later upgrading to an new electric ignition distributor I have stored. 

 

At first I actually thought it would increase my idle since the car came with an a/c setup, but looks like I'm completely wrong. :rofl:  


You know this is a beautiful car; it's still got a good engine but until we get that piece that fixes the engine its not going anywhere.


#4 tr8er

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Posted 06 February 2018 - 01:32 AM

I think it also engages overdrive. Could be wrong

#5 datzenmike

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Posted 06 February 2018 - 06:07 AM

Overdrive? They only came with 4 speeds (this one looks like a standard) or auto. The automatic were either vacuum kick down or an electric solenoid operated by a switch under the gas pedal.


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#6 jcd0402

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Posted 06 February 2018 - 10:06 AM

Yeah, originally the car is a 4 speed. I'll be keeping it that way.

Nothing will happen if I don't wire it up right; since I'm using a non-emissions distributor?

You know this is a beautiful car; it's still got a good engine but until we get that piece that fixes the engine its not going anywhere.


#7 racerx

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Posted 06 February 2018 - 07:09 PM

It will explode if you don't wire it up...joking, it should be okay. I got mine unhooked, ttl advance on dust at around 36 degrees, pertronix system.

#8 datzenmike

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Posted 06 February 2018 - 07:52 PM

The original distributor had an extra set of points about 4 degrees slower opening. The initial timing is set on the first set of points and by adding in the second, later opening points, the timing can be retarded 4 degrees.


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#9 jcd0402

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Posted 07 February 2018 - 07:10 AM

Oh, okay, thanks guys. Guess I wont really have to worry about it not being hooked up then. :D Now I just need to figure out how to raise the idle for when I start installing the whole a/c system.

You know this is a beautiful car; it's still got a good engine but until we get that piece that fixes the engine its not going anywhere.


#10 datzenmike

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Posted 07 February 2018 - 07:17 AM

The 720 uses an idle up solenoid on air equipped models. I can't find the same thing on L20 equipped engines. I don't know how or even if it was used.


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#11 jcd0402

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Posted 08 February 2018 - 06:08 PM

I guess I can make a cable that twists the throttle a slight bit every time I turn on the a/c. Just like the old datsun roadsters cruise control cable that is hooked up to the throttle linkage.  


You know this is a beautiful car; it's still got a good engine but until we get that piece that fixes the engine its not going anywhere.


#12 datzenmike

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Posted 08 February 2018 - 07:18 PM

Well this supposes that the engine will stall when the air is on. Lots of old Datsuns were retro fitted with air and I've never heard of any having a throttle up solenoid added or a problem with stalling. My 710 has/had air and has the stock carb and there's nothing else.


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#13 Lockleaf

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Posted 09 February 2018 - 05:42 PM

Factory ac carb applications use an electronic solenoid that just bumps the throttle and holds it open slightly more.

Half Pint ('71 510 Goon) http://community.rat...agon/p?=1269361

 

Audrey ('69 Roadster 1600) http://community.rat...rey-the-ratster

 

Tiny Havok ('85 720 DIY built Crewcab 4x4) http://community.rat...ache/?p=1395455

 

720 Shenanigans http://community.rat...20-shenanigans/


#14 datzenmike

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Posted 09 February 2018 - 05:44 PM

The 720s do. The electrical ones that is. Haven't seen it on any Datsuns. I have 710 with factory air and nothing on the carb but a dash pot.


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#15 jcd0402

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Posted 09 February 2018 - 07:56 PM

https://imgur.com/x43wBK3

https://imgur.com/kqCOKKa

This is the carburetor I'm running. I belive its an new/old stock arrow carburetor. Don't really know if its set up for an a/c. Yet, I do think it has an electric choke.

You know this is a beautiful car; it's still got a good engine but until we get that piece that fixes the engine its not going anywhere.


#16 datzenmike

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Posted 09 February 2018 - 10:11 PM

x43wBK3.jpg

I would say an earlier car carb with the metal case electric choke. Maybe '72/'73? All later ones are black plastic. I had a '71 521 and it was manual I think the 510 was the same. The very earliest '73 610 with the L18 also had this style.

 

I don't see any provision for holding the throttle partly open to increase the idle speed. Anything to do this would have to have electrical wires as it would be a solenoid.


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#17 jcd0402

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Posted 10 February 2018 - 04:48 PM

Would you happen to know what that roundish thing with the center bolt do? It says open and close. I've been trying to find carburetor manuals online to see if I can find all the details about this one but no luck so far.

You know this is a beautiful car; it's still got a good engine but until we get that piece that fixes the engine its not going anywhere.


#18 datzenmike

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Posted 10 February 2018 - 05:58 PM

That's the electric choke heater. Later ones were plastic.

 

3amNNxv.jpg

 

 

Inside is an electrically heated coil that warms a bi-metallic strip that unwinds as it warms up and releases or opens the choke. When engine cools the strip re-coils and pull the choke closed for the nest start.

 

RLg5TcI.jpg


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#19 Doctor510

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Posted 10 February 2018 - 06:55 PM

1200, auto choke   or an A14



#20 jcd0402

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Posted 10 February 2018 - 11:26 PM

Oh, that's cool I guess; specially since I'm planning to daily drive it once the a/c gets installed, and I finish inspecting all the chassis components. But that won't be till later in the summer once I get new suspension hardware, and new rear brake masters. 


You know this is a beautiful car; it's still got a good engine but until we get that piece that fixes the engine its not going anywhere.