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Hi guys. Experimenting with jet sizes. What do you reckon of these plugs? Too light?

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Not for HEI.

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T

My Shed

Holdenpaedia, they're the brakes Mate.

No, I'm back to the points now. Advance curve on the HEI was too savage

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Dave H - Sydney
[http://gallery.oldho...|My Shed] - 1963 EJ Special - Ti Tree Green

I'm saying that colour is normal for HEI.

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T

My Shed

Holdenpaedia, they're the brakes Mate.

if there is no surging or anything, its happy days...

are you running a variable main jet or have a supply of various sized fixed jets?

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Variable Ben. The 55 I had in there was running a tad rich so replaced it with a variable. Just a bit wary of running too lean and burning the valves.

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Dave H - Sydney
[http://gallery.oldho...|My Shed] - 1963 EJ Special - Ti Tree Green

Why don't you get the HEI re-curved ? Send it to a decent place and you won't no yourself

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the engine will tell you if its not happy, it will surge and carry on - you will feel its just not right.

most damage is done when you are too lean at full throttle, if you rarely drive using full throttle its almost a non-issue. modern cars cruise around 17:1 air fuel ratio when little load is required.

i service a bone stock manual hj wagon regularly for an old fella, he is one of those blokes that keeps a logbook with every litre ever put in the tank, i put an adjustable main jet on his because it has had an exchange carby at some point in time and it was not correct for the car, was drinking too much fuel (fixed a few other things too) but with the jetting in that carby it was still using too much fuel. like 4km/L.
he tinkers with it and if he goes too lean you can tell, its just not sweet to drive, jerks and surges, but the economy is the best that way if you were to put up with it. in good tune it will consistently do 7-8km/L and is better if its even leaner, but as i say drives s#ithouse this way. he is happy with his economy, and because he has been driving holdens forever he remembers what economy they used to get when new.

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Thanks Ben. I've been getting around 23mpg (specs for the red 138 are 30mpg). With the 55 jet I was getting carbon covered plugs and a black whiff out the back on acceleration. With the variable she's running nicely, plenty of power and plugs are as you see.

I've been told it's harder to check mixture using the plugs now as modern fuels burn much hotter and leave less residue.

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Dave H - Sydney
[http://gallery.oldho...|My Shed] - 1963 EJ Special - Ti Tree Green

The more usual instance is an exhaust valve that didn't seat properly due to improper tappet clearance.

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T

My Shed

Holdenpaedia, they're the brakes Mate.

where do you get those specs from?

i don't believe you can really compare old road tests and such cause there is just so much more traffic in the average city/town now. more traffic lights, more roundabouts, less steady cruising. so if you can come close to those old day fuel use figures, you are probably there...

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That's from the LC Torana workshop manual. I thought it sounded a bit high and 23 mpg is pretty respectable anyway. The grey engined EJ road tested at 23 back in the day.

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Dave H - Sydney
[http://gallery.oldho...|My Shed] - 1963 EJ Special - Ti Tree Green

And you won't have to guess anymore. I bought mine around 1988 to keep the SUs in check. Still have the SUs and the CT, with a 'happy' 21-23mpg from the stove hot 202.

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They don't make em like they used too!

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