Nikki & Weber jet sizes

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Pavlos
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Nikki & Weber jet sizes

Post by Pavlos »

Just a bit of a noobie question. Should I go by the jet sizes of the nikki to use on a 32/36 weber, or will it run lean due to the bigger throats on it.

I've pulled a Weber down and cleaned it up etc and have jets from a 2.0L (presumably) and from a 1.6L Cortina/Capri/whatever the motor came from.

NB: Im not interested in the whole Nikki vs Weber argument/dyno tuning, it's just some idea's floating around in my head at work :)
gemifreak3342
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Post by gemifreak3342 »

I'm pretty sure the nikki jets not work/ fit in a 32/36 weber.
Pavlos
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Post by Pavlos »

I know they wont fit, I was wondering if the weber jet size should be the same as the size in the Nikki or I have to compensate bigger jets for the increased air flow (if any)
Germinator
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Post by Germinator »

Simple answer is no. Not going to match part for part in the jet sizing.
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Pavlos
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Post by Pavlos »

So does that mean a 145 nikki jet will flow less or more than a 145

What Im thinking of doing is trying to match the current size to reduce lean/flat spotting etc.

for example
Nikki:
Primary - Secondary
145 165
Weber:
134 150

Should I get weber jets to copy the same numbers in the Nikki or more or less.
Germinator
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Post by Germinator »

Two different carbies, they don't work identically to each other as well as the venturi sizes being different.
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Pavlos
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Post by Pavlos »

Thanks. Makes sense :)
geminilover3236
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Post by geminilover3236 »

Yer, 2 different carby's. I run 120 primary and 185 secondary on my nikki which is heavily modified to flow better and that's about right, maybe a tad rich on the secondary.

But your gonna have to start fresh with the weber.
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tezza
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Post by tezza »

just use the weber with the stock 2.0 litre jets used in the cortina. My daughters wagon runs a Cortina weber which is stock and never had an issue with it. Ran from Brisbane to Taree on a tank of fuel. I just had to change the choke over to electric.
Drive fast..Take risks!
tobytj
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Post by tobytj »

Unfortunately, unless you pull the carbie off the cortina yourself, there is no guarantee that yuo will get cortina jetting.

http://www.ozgemini.com/forums/tech/vie ... hp?t=18183

There are a few views on weber jetting on this site at the end of the thread
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Post by Germinator »

The stock Cortina/Escort factory jetting will start the engine and run but it is NOT ideal. It's quite possible that carby has altered jetting Tezza.

It isn't just the difference in overall capacity that matters, it's the difference in bore/stroke ratio as well as connecting rod length differences that matters.

You might expect a 32/36DGV to run the same on a G200Z but it doesn't run the same as it does on the 2 litre Ford engine. It's the same as using the twin DCOE setup off my old Ford Lotus twin cam engine on a G161Z engine, it is also a 1.6 litre but they just don't swap over like that.

I suggest anyone wanting to get into carby swaps takes the time to learn about them before starting. How often is the same Weber carby settings question asked here and it's yet to be answered. All too often people post here not asking for someone to teach them, only asking for free handouts... That is one of the main reasons Gemi Coupe said he got sick of helping, he said he left because he was sick of people not wanting to learn, just asking for a free mechanic!

So, rather than just telling someone 'the answer', offer them a means of learning for themselves. Understanding how a car functions is what we are all hoping to achieve isn't it? When you don't understand what can cause a problem you often just randomly replace things which costs money... the idea is to use the symptoms to narrow down a lot of possibilities to a few, then do some tests to reduce that smaller number of possibilities even further.
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tezza
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Post by tezza »

The carby was off a TD Cortina.I should know as I used to own one. I removed it myself from a bog stock 2 litre engine.
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Pavlos
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Re: Nikki & Weber jet sizes

Post by Pavlos »

Pavlos wrote:it's just some idea's floating around in my head at work :)
Next time, I'll just swap them over and ask for a free mechanic instead of clarifying things beforehand ;)
tobytj
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Post by tobytj »

tezza wrote:The carby was off a TD Cortina.I should know as I used to own one. I removed it myself from a bog stock 2 litre engine.
Tezza, I wasn't having a go at you mate. I was just saying that unless Pavlos making the knows the carbie he has came from a cortina he should not assume.
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