Carb adjustment
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- Linda
- Fraternal Den Mother-RIP
- Posts: 7807
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- Model: 1500/1600
- Year: High Windshield-68-70
Re: Carb adjustment
Hi Dave,
I think .076 might be too far from the magic number .087. Your current .080 might be better. I think idle is always going to be rich with the stock needles. But the ADQ needles are better at idle. The real question is how does it go at running speed.....And plug color.
I currently have my carbs at.080 and I have nice power for my kind of around town driving. Idle is around 750-800. Of course the bushings are a little bit worn.
Interestingly I was talking to Skip Miller , today, (Miller Sports and Imports, Datsun mechanic from the beginning ,) and he asked what I did with the car recently, and I said slightly adjusted the carbs using the magic number method. He said back in the day they had a tool that would fit down into each carb so that you could match each carb, kind of like we are doing. Ha.
I will find out more about that tomorrow when I pick up my other car.
I added a Spectre air filter too so the air flow is better Linda
I think .076 might be too far from the magic number .087. Your current .080 might be better. I think idle is always going to be rich with the stock needles. But the ADQ needles are better at idle. The real question is how does it go at running speed.....And plug color.
I currently have my carbs at.080 and I have nice power for my kind of around town driving. Idle is around 750-800. Of course the bushings are a little bit worn.
Interestingly I was talking to Skip Miller , today, (Miller Sports and Imports, Datsun mechanic from the beginning ,) and he asked what I did with the car recently, and I said slightly adjusted the carbs using the magic number method. He said back in the day they had a tool that would fit down into each carb so that you could match each carb, kind of like we are doing. Ha.
I will find out more about that tomorrow when I pick up my other car.
I added a Spectre air filter too so the air flow is better Linda
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Sadly-Linda has passed away 2022. She was the 311's den mother and drove the first Rare-Parts ball joint project. RIP.
- Linda
- Fraternal Den Mother-RIP
- Posts: 7807
- Joined: Sat Nov 05, 2005 11:37 pm
- Location: Los Angeles
- Model: 1500/1600
- Year: High Windshield-68-70
Re: Carb adjustment
Here's the tool Skip Miller was talking about that they used to center the nozzle and also set a starting point for the nozzle adjustment. How it works is you take off the dome, take out the Piston, then replace the dome. Take out the oil damper plunger, then put the tool down in the opening to center the nozzle. After that is done, flip the tool over to check for nozzle depth, then fine tune from there. Just looking at the near end of the tool it appeared close to the "magic number" and I wished I could have measured to see what it was. Skip said these were some of the special tools they were given to use at Datsun dealerships.
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Sadly-Linda has passed away 2022. She was the 311's den mother and drove the first Rare-Parts ball joint project. RIP.
- mraitch
- Roadsteraholic
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Re: Carb adjustment
so, what depth does this tool set to??
Peter Harrison
1970 1600 (Stroker) - TOAD SAN (Eliza)
1970 1600 (Stock) - As Yet Unnamed
Lake Balboa (SFV) , California
1970 1600 (Stroker) - TOAD SAN (Eliza)
1970 1600 (Stock) - As Yet Unnamed
Lake Balboa (SFV) , California
- Linda
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Re: Carb adjustment
As I said, I don't know, wish I could have measured .
Linda
Linda
Sadly-Linda has passed away 2022. She was the 311's den mother and drove the first Rare-Parts ball joint project. RIP.
-
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Re: Carb adjustment
That's a cool tool. Wish I had one in my toolbox!
Dan
1964 Datsun SPL310. The Datsun
1997 Toyota Tacoma LX 4wd. The Truck
2009 Subaru Forester XT.
2017 Toyota AWD Swagger Wagon.
1964 Datsun SPL310. The Datsun
1997 Toyota Tacoma LX 4wd. The Truck
2009 Subaru Forester XT.
2017 Toyota AWD Swagger Wagon.
- Linda
- Fraternal Den Mother-RIP
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- Joined: Sat Nov 05, 2005 11:37 pm
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Re: Carb adjustment
Skip said I could make one, but I think he forgot who he was talking to...lol
Linda
Linda
Sadly-Linda has passed away 2022. She was the 311's den mother and drove the first Rare-Parts ball joint project. RIP.
- mraitch
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Re: Carb adjustment
JT68????
Peter Harrison
1970 1600 (Stroker) - TOAD SAN (Eliza)
1970 1600 (Stock) - As Yet Unnamed
Lake Balboa (SFV) , California
1970 1600 (Stroker) - TOAD SAN (Eliza)
1970 1600 (Stock) - As Yet Unnamed
Lake Balboa (SFV) , California
- DCooke
- Roadster Fanatic
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- Joined: Mon May 03, 2004 10:58 am
- Location: Cary, IL
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- Year: High Windshield-68-70
Re: Carb adjustment
I like the concept of measuring the depth with a precision tool. Is there a similar specification for the needles? I thought I recalled that when I installed them, there was a depth adjustment. It would be good to know how to check this...
Dave Cooke
Cary, IL
1968 1600
1969 1600
2016 BRZ
Chicagoland chapter of the Dairyland Datsuns
Cary, IL
1968 1600
1969 1600
2016 BRZ
Chicagoland chapter of the Dairyland Datsuns
- Linda
- Fraternal Den Mother-RIP
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- Joined: Sat Nov 05, 2005 11:37 pm
- Location: Los Angeles
- Model: 1500/1600
- Year: High Windshield-68-70
Re: Carb adjustment
In the Tech Wiki the write ups talk about setting the needle, basically flush, then you can slightly bring it out to adjust idle.
Linda
Linda
Sadly-Linda has passed away 2022. She was the 311's den mother and drove the first Rare-Parts ball joint project. RIP.
- DCooke
- Roadster Fanatic
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Re: Carb adjustment
So after a spirited test drive, I’m liking the 0.080 setting much better. Lots of pickup, no pinging and the idle is pretty smooth. I’ll stick with this setting for the summer. Now to adjust the clutch...it’s always something on these cars #StillEnjoyingTheDrive
Last edited by DCooke on Mon Jun 04, 2018 8:46 am, edited 1 time in total.
Dave Cooke
Cary, IL
1968 1600
1969 1600
2016 BRZ
Chicagoland chapter of the Dairyland Datsuns
Cary, IL
1968 1600
1969 1600
2016 BRZ
Chicagoland chapter of the Dairyland Datsuns
- oppositeLock
- Roadster Fanatic
- Posts: 137
- Joined: Sun Jan 15, 2017 8:32 pm
- Location: San Jose, CA
Re: Carb adjustment
I just did 0.087 + 1/4 turn leaner after Dave Premo rebuilt my carbs and it runs fantastic. (Keith's needles) Thanks Dave!
'68 R16 + 5spd
- Linda
- Fraternal Den Mother-RIP
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Re: Carb adjustment
Would be interesting to know what a "1/4 turn" represents, and how matched the depth turned out to be.
Linda
Linda
Sadly-Linda has passed away 2022. She was the 311's den mother and drove the first Rare-Parts ball joint project. RIP.
- Mackn367
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Re: Carb adjustment
Hey Linda how do you like the Spectre air filter? I also had one and installed it in my 1600 but I actually felt less power than with the stock new filter. Thanks!Linda wrote: ↑Tue May 29, 2018 10:19 pm Hi Dave,
I think .076 might be too far from the magic number .087. Your current .080 might be better. I think idle is always going to be rich with the stock needles. But the ADQ needles are better at idle. The real question is how does it go at running speed.....And plug color.
I currently have my carbs at.080 and I have nice power for my kind of around town driving. Idle is around 750-800. Of course the bushings are a little bit worn.
Interestingly I was talking to Skip Miller , today, (Miller Sports and Imports, Datsun mechanic from the beginning ,) and he asked what I did with the car recently, and I said slightly adjusted the carbs using the magic number method. He said back in the day they had a tool that would fit down into each carb so that you could match each carb, kind of like we are doing. Ha.
I will find out more about that tomorrow when I pick up my other car.
I added a Spectre air filter too so the air flow is better
15276520396950.jpg
Linda
Nick
1967.5 Roadster 1600
VIN: SPL311-13038
Orange County, CA
1967.5 Roadster 1600
VIN: SPL311-13038
Orange County, CA
- Linda
- Fraternal Den Mother-RIP
- Posts: 7807
- Joined: Sat Nov 05, 2005 11:37 pm
- Location: Los Angeles
- Model: 1500/1600
- Year: High Windshield-68-70
Re: Carb adjustment
Well the air filter I had was pretty dirty, so this one is an improvement!
Linda
Linda
Sadly-Linda has passed away 2022. She was the 311's den mother and drove the first Rare-Parts ball joint project. RIP.
- Mackn367
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Re: Carb adjustment
Oh ok yeah that makes sense of course. I wasn't sure if you were comparing a new original filter to the Spectre.
Nick
1967.5 Roadster 1600
VIN: SPL311-13038
Orange County, CA
1967.5 Roadster 1600
VIN: SPL311-13038
Orange County, CA