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Author Topic:   PLUGS
19J
Dirt Freak

Total posts: 370
posted April 19, 2005 07:48 PM  
Whats everyones opinion on how long it should take to color in your plugs. I think im running way lean plugs are still like new white. With tons of idleing time and about 10 miles on them then about 12 laps of flat out then about 10 of pace laps. Still no color maybe its too soon but maybe im running lean i dont know.

RangeRover
Dirt Freak

Total posts: 279
posted April 20, 2005 07:24 AM  
Sounds lean to me. What about the water temp and car's performance?

19J
Dirt Freak

Total posts: 370
posted April 20, 2005 07:38 AM  
Warm and ****py. Thats what i am thinking too. It has a good fan a decent shroud and all.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted April 20, 2005 08:24 AM  
Is this alky or gas? It may take half a season or more to see color on an alky engine.

If its gas and they are white then you have problems.

[This message has been edited by dirtbuster (edited April 20, 2005).]

19J
Dirt Freak

Total posts: 370
posted April 20, 2005 10:31 AM  
I know i have problems but please lets stick to the subject lol jk.

What do you think it is. Yes is gas. I would like to run the car friday. So what is your thoughts. I thought the same thing but my bro thought they were too new. THANK YOU!!!!

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted April 20, 2005 10:48 AM  
On our mod they will show color after 10 minutes of idling, and most definetely after being on track.

Are they white only or white and glazed over? Are there any specks like pepper on the porcelain? Are the electrodes still in good shape or have then beeneaten away or rounded off?

Have you tried jetting it up to see what happens?

19J
Dirt Freak

Total posts: 370
posted April 20, 2005 11:15 PM  
They are mostly just white i think. No specks just the plugs look brand new out of the box. The are in good condition. I put in bigger jets tonight but i dont know. Say if i had too low of octane what would that do? Would it absolutely knock or just run like this. ALL help is very much appreciated. I went from 50 to 58. This is all new and we are still doing the trial and error. I think i need to switch from the stock jets to holley though. It would help me out a bunch i think. but when i do is a holley 58 the same as a rochester 58 thanks!

fastmod5
Dirt Full Roller

Total posts: 36
posted April 21, 2005 06:08 AM  
19J, Holley and Rochester jets are not the same throw the Rochester jets away and just use holley jets go and buy yourself a holley jet kit and bring it to the track with you. What is the size of your engine? I ran a 355 flat top on gas with Rochester 2 barrel my jet selection was mid 70's with Holley jets. What plugs are you running? I ran AC45 or 44's. Timming was set at 34*. If its still white before you do this you will burn up the pistons. It's worth a shot.

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www.baermotorsports.net

[This message has been edited by fastmod5 (edited April 21, 2005).]

KPLugnut
Dirt Forum Champ
Total posts: 1019
posted April 21, 2005 08:06 AM  
19J, if you have Rochester jets in the carb, and they were/are 58, you are still FAR too lean. Rochester jet numbers corespond to the actual orifice size in thousandths of an inch (.058"). For even the most basic small bore 2G carb (1.25" venturi), you're going to need to go up to about 68 jets (.068") before you'll see plug color or you're going to detonate and damage the motor ESPECIALLY with such low octane fuel.
I'd begin by putting in at least a mid-60's jet size or more, and running at least 94 octane pump gas.
Installing/converting to Holley jets would be easier as far as obtaining a selection of jets but it is not absolutely necessary, and you won't need to go as high as mid-70's in Holley jets unless it is a 1 3/8" venturi carb that has had work done to it.
We can provide you with jets, parts, services, etc, if needed, but first and foremost, I'd be going up a LOT in jet size...

Hope that helps,
Kinetic Performance

marshalr
Dirt Maniac

Total posts: 148
posted April 21, 2005 08:52 AM  
Hey KP I'm curious, can ya just swap the Holley jets into the rochester carbs?
I run a QuadraJet in my superstock. Parts are getting hard to find, i'm already modifying the secondary rods myself.
I have been reluctant to swap over to a Holley jet since the rochesters have a radius and a step it seems like.
I'm always wary of sitting in my garage and trying to be smarter than the engineer with computers and flowbenches in a laboratory.
Thanks!

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Some People Race For A Living; I Live To Race

KPLugnut
Dirt Forum Champ
Total posts: 1019
posted April 21, 2005 09:21 AM  
No, you cannot swap Holley jets into a quadrajet at all. First, the Holley thread is a 1/4x32NEF thread (extra fine pitch), and Rochester threads are 1/4x28NF thread.
Next, the position, entry angle, height, and length of the orifice in a Holley jet is totally wrong for use as a quadrajet primary jet because the relationship between that orifice and the metering rod's critical taper area would not line up correctly.
You'd spend a LOT of time trying to come up with what jet would finally work with the primary rods, and in the end, you'd be back in the same final jet size as you're probably running right now (72-74 or so).
Primary rods are still available in several different diameters, and there are several places that secondary rods can still be obtained.
As for secondary jetting, it would require HUGE Holley jets and some very fancy and meticulous machining to install jets in place of the secondary orifice "washers", and you'd almost never get a good fit between the secondary rods and the jet itself due to interference with the jet head/slot area.

Holley jets are, however, very often used in 2G Rochesters, and 1/4x32 jet taps are easily available from tool suppliers (or we can sell 'em to ya).

Hope that helps,
KP

marshalr
Dirt Maniac

Total posts: 148
posted April 21, 2005 02:25 PM  
Thanks KP- you're da man.

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Some People Race For A Living; I Live To Race

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