Drilling out jets?

[ccowx]

I am in agreement. I think the tune was done that way to cover the 009 bog, which it did ok. My thought now was to go with a 57.5 idle and the 135 main jets. Decent starting points for tuning?

Thanks!

Chris

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65/135 is definitely too rich.
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[ccowx]

gkeeton,

Funny, your guess is probably closer than you think. I have been running this engine for years with a 65/135 jet combination. Up until now it has had a stock 34-3 with 26mm venturi and an 009 distributor. The jetting was done by a very knowledgeable VW friend, but it was an off the cuff setting, rather than a result of fine tuning.

I was thinking that with the 28mm venturi it may end up slightly richer, but I was hoping that the SVDA dissy would make it need a bit less coming off idle.

Thanks!

Chris

PS: John said something about altitude. For what it's worth, I am at about 2500' here, though I drive around at various altitudes between 1500 and 3500', with a few runs to sea level.

[[email protected]]

Any factory VW Solex 34 pict 3 I've messed had a 55 for an idle jet, so I would say you may end up with something 60, or larger. I'd start with a 60/135, and see what it does. With the added displacement, you may need to open the accelerator pump jet as well.

[FreeBug]

Do you have an AFM? Share the readings.. And if you don't, seeing as you are talking about future Webers, get one!

[ccowx]

I thought the 45 was the stock idle jet in a 34-3?

The thread I was looking at is here:

https://www.thesamba.com/vw/forum/viewtopic.php?t=511245

The distributor is a 113 905 205 AJ that has been curved to come in at 2800-3000 rpms and has the SVDA vac can that I bought from you.

Thoughts appreciated!

Chris

PS: I know about the Webers thing. I am trying to save the oil bath aircleaner for driving in sand conditions and to have it look stock-ish. Webers all the way on my upcoming beetle project!!

[modok]

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who said anything about using a 45 idle jet? Unless you are at 6k'+?

The jetting which works depends on your distributor, which you didn't mention.
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[ccowx]

I am using a PICT 34-3 with a 28mm venturi in an 1835 with an Engle 100 cam and an svda dissy. It is going into a 1970 Westphalia.

I have been looking at old threads about tuning such a set up and it seems that the idle jets are usually falling in the 55-60 range and the main in the 140-150 range. This was in a thread that Alstrup and you were involved in, among others.

My thought was to start out with a 55 idle and a 140 main jet and see how that looks. I would think that the 45/127.5 combo would be lean. My goal is driveability and mileage, with any power gains a welcome side effect.

I am very open to any suggestions or advice on tuning this combo!

Thanks!

Chris

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idle jets should be changed in increments of "2-2.5" anyways, not 5. 5 is a huge change in size, way too big for one shot.
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[ccowx]

So, I got it totally reversed? Story of my life!

Seriously, that is fair enough, now I know what the numbers mean and I can figure out where I am at.

Thanks!

Chris

[FreeBug]

The fuel is metered by the hole on the tip. The holes on the side are just to let fuel through. The total area of the holes on the side is way greater than the metering hole, anyways.

[ccowx]

Here is another question. I am looking through my jets and I am not sure what has been drilled and what has not. Specifically, I am wondering what is the relationship between the hole in the end of the idle jet and the four holes arranged radially around the body. I assume that the 4 holes are what is referred to with the "55" or "65", ie 5.5mm or whatever.

The end hole seems to be used mainly for allowing fuel into the jet, to be dispersed by the other holes. Am I correct and is there any critical measurement in this hole, or is it just to let fuel in and then it is metered by the 4 holes?

Chris

[gprudenciop]

Another thing is you shouldn't need a shit load of jets to tune just one.solder up your jet until you are happy than buy the one you need.
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[Krochus]

[Dale M.]

A set of "number drills" can double as jet gauge...

Dale
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All suggestions and advice are purely my own opinion. You are free to ignore them if you wish ...

[modok]

I thought he was looking for info on what size the jets SHOULD be???

Beyond the info in the service manuals, i don't know.
You might ask on the late beetle forum, some of those guys apparently use stock carbs.

[earthquake]

You should never use a drill on a jet, it can leave swirl marks in the bore which can decrease flow. you should always use a jet reamer. I think all the ones you buy nowadays are tapered, I had a set that were stepped like a Unibit but some one borrowed them from me and never brought them back.

Casey
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There are metric pin vise drill bit sets available. The last place I got a set from lists them out of stock, but there are other sources if you google it. The jet sizes are metric, so a "55" idle jet is .55mm. And as mentioned, if you get a standard set, you would simply divide the metric amount by 25.4. So, .55mm divided by 25.4 would equal 0.0216 inches.