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Author
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Topic: Plug reading and Jets
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Fastymz
Moderator Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-17-2002 01:26 AM
   
I did my 1st plug read with the new Holley.The porcelain was almost all white with a few tan specks.And the electrod was clean and uncolored same with the 1st tread no change in color from a stock plug.At least not that I could see that is. 
My old plugs with the carter always had black soot on the 1st two treads,and electrod.And the porcelian was tan.What to do now???
Up the jets,up the power valve,change the squerter size??? SCOOP WANT MORE POWER.  ------------------
2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
[This message has been edited by Fastymz (edited 10-17-2002).]
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steve'66
Gearhead Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-17-2002 02:05 AM
Ron,Up the jets. SteveW
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Fastymz
Moderator Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-17-2002 12:34 PM
quote:
Originally posted by steve'66:
Ron,Up the jets. SteveW
Steve I can only change the pri,jets.Because it has a meter plate for the secondary jets.
Will increasing the primary JETS only help? SCOOP ------------------
2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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steve'66
Gearhead Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-17-2002 01:42 PM
Yes it is too lean, try 4 jet sizes bigger to get some color into the first thread of the plug. Your tan specs on the white electrode mean you should back off the timing a little too.
SteveW
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Fastymz
Moderator Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-17-2002 01:57 PM
quote:
Originally posted by steve'66:
Yes it is too lean, try 4 jet sizes bigger to get some color into the first thread of the plug. Your tan specs on the white electrode mean you should back off the timing a little too.
SteveW
I already backed the timing down,alittle.It starts alot better now. Ok I'll try the 4 steps up in jets and let you know what happens.
Thanks Steve. Ron ------------------
2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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Fastymz
Moderator Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-22-2002 06:41 PM
Ok I got the new jets in I went with #67 primary jets.
I also adjusted the rear floats it was alittle low.
I cant say I feel any differnece at all.I was not expecting too,I just wasn't sure what to look for.The car seem to idle smooth no bog at any RPM.No black smoke,and the car dose not smell rich.
I went down a back road to test it.Run it twice pretty hard.Then checked the plugs,they still have all white porcelain.And the electrod was alittle darker until 3/4 of the way to the tip.Were it changes to a lighter color.
The 1st tread was alittle more black this time.But no build up or soot on it.Well guys what would you do now. Is the kit that converts my carb so it will have rear jets worth it?
Now the rear meter plate is a 134-39 which I think= a number 69 jet. PS. the old O-ring for the tranfer tube would not fit back in.So I grabbed a smaller one I had in the garage it dose leak now.But should I go and get the O-ring? Thansk SCOOP ------------------
2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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steve'66
Gearhead Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-23-2002 12:16 AM
Ron,The kit is worth it! You still need more fuel. Especially when you come to sea level in the winter for a new best time slip. You'll need another 4 sizes bigger front and rear for that, cause your carb is too small for your cubes. The only thing that makes it (the little carb) ok for now is your engine is a slug. No offense, SteveW [This message has been edited by steve'66 (edited 10-23-2002).]
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Fastymz
Moderator Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-23-2002 12:56 AM
quote:
Originally posted by steve'66:
Ron,The kit is worth it! You still need more fuel. Especially when you come to sea level in the winter for a new best time slip. You'll need another 4 sizes bigger front and rear for that, cause your carb is too small for your cubes. The only thing that makes it (the little carb) ok for now is your engine is a slug. No offense, SteveW [This message has been edited by steve'66 (edited 10-23-2002).]
Steve thats what I like about your advice.No FLUFF just Facts.  If I get the kit WHAT should I run in the rear jets.Here in Reno should I go another four bigger in the front jets?
I did buy a 68 jet too,is that not enough jump? And last question how do I know when the jets are too big,and if that happen how many down do you go. Besides the plate kit for the rear of the carb,what else can I or should I do to get more out of this carb? I dont want to put to much money into this carb. Or would a 750 vac secondarys be better? THE SLUG ------------------
2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
[This message has been edited by Fastymz (edited 10-23-2002).]
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Fastymz
Moderator Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-23-2002 11:30 AM
I going to go buy the conversion kit today.And I'm going to go with #73 rear jets to start with?
And I'm going to go ahead and get #71 front jets.I hope thats not too much. SCOOP ------------------
2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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Moneymaker
Administrator Posts: 27499
From: Lyons, IL, USA
Registered: May 99
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posted 10-23-2002 02:18 PM
You go Scoop! ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
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steve'66
Gearhead Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-23-2002 03:27 PM
Sounds like a good start. Then read your plugs. SteveW
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Fastymz
Moderator Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-23-2002 05:08 PM
Ok I got the kit on,I must say the Holley carb is very easy to work on.I dont get how people can say they are hard to tune and work on. 
Any ways the kit went right on.I went with #71 front jets and #77 rear jets.I was reading in a holley tune up book that you should keep the jets spaced the same way they started out.So I did they were six points out from each other.
I ran the car on the road in the way.I checked the plugs and now they have a small amount of black soot on the 1st tread and the top of the plug.The electrod as little darker color now too.And the porcelain has alittle tan color about half way up from the bottom.The top half is still mostly white,alittle more off white now. The plugs still look alot better the they did with the carter carb. The old plugs were real tan,and had twice the black soot these do.
SO whats next,the car runs good idles good dosenot smell,or put out any black smoke still.The car seems to pull better aboove 2000rpm,dose this mean anything.
This low buck CARB is adding up FAST.
SCOOP
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2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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Fastymz
Moderator Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-23-2002 05:10 PM
One tip ALWAYS hook up your fuel line to the carb before cranking it.
Dont ask me how KNOW this.SCOOP ------------------
2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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steve'66
Gearhead Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-23-2002 05:29 PM
quote:
Originally posted by Fastymz:
I ran the car on the road in the way.I checked the plugs and now they have a small amount of black soot on the 1st tread and the top of the plug.
SO whats next,
Run it hard, turn the key off and coast to a stop. Pull #1 and #8 plugs and look at them again. They should have a gray, charcoal collored first thread. If the are black/sooty then jet down a couple and try again. SteveW
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Fastymz
Moderator Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-23-2002 06:54 PM
There were some people on the back road so I did not get carzy.I ran it hard thur 2nd gear,then shut it down coast to a stop.Plugs look dark grey 1st tread,and top of treads the flat part (if that makes sense)is more black-grey sooty.Both kids said the plugs looked more dark grey then black.Always good to have help,and besides told both kids about plug reading and jet sizes.
The electrode is grey,ecpect for the very bottom,was more black-grey sooty.So I'm I close enough or should I go lower?
And if lower how many STEPS,
two steps for both front and rear or what. SCOOP ------------------
2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
[This message has been edited by Fastymz (edited 10-23-2002).]
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Fastymz
Moderator Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-23-2002 07:04 PM
Next question what runs faster, leaner or richer?
I have always felt safer about having the car alittle richer.
And how dose heat outside temp,and engine afect,running richer or leaner.Dose hotter temps lean out the car more?
And colder temps make it more rich?SCOOP ------------------
2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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steve'66
Gearhead Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-24-2002 10:21 AM
Did the plug in the back look the same as the plug in the front?
Try two jets smaller front and back if they were the same.Colder intake air is denser, which will lean your mixture. Hotter will run richer. As far as what makes more power, "just right" does. SteveW
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Moneymaker
Administrator Posts: 27499
From: Lyons, IL, USA
Registered: May 99
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posted 10-24-2002 10:55 AM
There is no steadfast rule on jetting for max power. The only actual facts are that engines like to be richer at low RPM and leaner at high RPM. You have to find a happy medium with a carb. This is one reason fuel injected cars are so fast and efficiant. Managment throughout the RPM range. ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
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Fastymz
Moderator Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-24-2002 03:46 PM
I'll get the new jets some time this week.I'll go two steps down on both of them.
Thanks for the help,I'll keep trying to get it right.
Both plugs looked the same,and the car now leaves two black spots on the ground when you 1st start it.It was doing that with the carter,and I did not see it agian until I made it more rich.The fact the I put that kit on change any thing.Or is it just the jets? SCOOP ------------------
2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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Fastymz
Moderator Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-29-2002 05:22 PM
Well I got the new jets in this time #69 front jets and #75 rear jets.The plugs looked good,alittle black on the very top of the 1st tread.And the electrod was all grey except for the very tip was alittle black.
I did notice today that the car seems to pull harder from off line to about 4800rpm,after that so so.I sure wish there was a track near by.I did notice that when it's cold out and you let off the gas you get whats like a popping like it gose{ BABABABA} then it gose away.No surging but it was cold this morning like 38 degrees out.And no choke,started 2nd crank with one pump. WELL guys tell me what you think.I'm real happy with how the cars running it starts more easy when it's warm the plugs have more color to them,and the car even at a rolling spins the tires more,then before I changed the jets. SCOOP
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2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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steve'66
Gearhead Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-29-2002 11:11 PM
quote:
Originally posted by Fastymz:
WELL guys tell me what you think.I'm real happy with how the cars running it starts more easy when it's warm the plugs have more color to them,and the car even at a rolling spins the tires more,then before I changed the jets.SCOOP
Ron, You're close, but remember the thread reading only applies to full throttle pulls after a clean shut down. Do that and look for charcoal gray on the first thread of the plug. period. . . . I mean "period" . . Got it? SteveW
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Fastymz
Moderator Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-30-2002 01:18 AM
I got it, "Well I got the new jets in this time #69 front jets and #75 rear jets.The plugs looked good,alittle black on the very top of the 1st tread.And the electrod was all grey except for the very tip was alittle black." Steve the reading was after a hard run and a clean shut off. Ron ------------------
2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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