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Just pulled a timing light and dwell meter out to read my Brumby timing - to find it sitting at 6 DBTDC @ 800rpm vac disconnected. Timing was marked before some eighht years 60,000km ago on 10 DBTDC. I ramped it up a bit to 16 @ 800rpm. See how that goes. I figured that when I fitted up the EA82 spfi inlet manifold some 15,000 or more km ago, I must have needed to move the dizzy to fit things around it, never rechecked it ! been losing 50 to 70 km a refill, though oddly also getting old fuel distances from some tanks too.

Advancing the timing has reduced the speed in each gear it revs to now - probably a good thing !



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Yes - always a good idea to check these things after surgery ...

Ciao, Bantum ...

I've always had best results at 12 to 14.

The book says 8 degrees, give or take 2.

I have mine at 6 which is still within spec, any more and it doesn't run right. I blame carbon buildup.

One day I will clean it and get some better fuel economy.

mmm, makes sense eh.

As once reported mine ran on the dyno best at 13 degrees (vacuum disconnected) and 29 max when revved high (vac connected). With the 15/55 cam. I can understand not checking it regularly but at least once a year Jonno...sheeeesh!!!

steptoe wrote:been losing 50 to 70 km a refill, though oddly also getting old fuel distances from some tanks too.

Someone's showing their age - there's a hate thread about this somewhere started by you Steptoe. Should I dig it up for reference?

Classic.

I should see where I've got the timing set on Redback. I don't know if it'll really like 12 deg BTDC though!

Cheers

Bennie

I set mine to 10 deg on the carby L series which I felt was conservative. With nothing more than fancy engine pipes, min 95Ron and lots of carbon build up from worn rings and shyte PCV system.
Ran great for yonks.
Now I have rebuilt the bottom end with standard sizes and 20thou off the deck faces and N/A EFI cams I will be keen to see what advance I can squeeze (before and after a re-jet of the Hitachi carb, of course:twisted:).

The 3 C's which are only as good as the ignition system and timing!

J.

OK, I was in a rush when I posted that.....

I used to use, sort of still do..540 km as a fill up marker and my old Brum EA81 16/56 cam 5 speed....would take 70 litres, leaving me 10 litre reserve...but see if I wrote that...cause a stir coz most of youse only got little tanks and please don't go trying to fit a Ford Couriers tank in your ute unless its a gas tank in the tray

My rebuilt EA81 with 4 speed and 20/60 .225" lift Watson Race Cam would do the 540km on 65 litres. The EA82 twin port would do even better - maybe 62 litres for the 540km. Did 720 km on 80 litres, then had a 400m push to the pump one Christmas Eve

So, all I did was fit a bigger inside volume EA82 spfi inlet manifold (or so I thought) and i struggled to get 500km from the empty mark - 65 litres most fills. Some, I could stretch out the fill at 540 km and take the 64 , 65 litres of cough 109 octane which is why I can wind it out to 16 DBTDC. My EA82 twin port runs 22 degrees when it's running.

I retuned the gas mixer, leaning it out a little further to get that occasional 540 km run.

Now that I have got the leaner burn & the extra 10 degrees I hope to get my regular 540km for 65 litres and happy in lknowing I am doing better than the 70 I was used to before !

These babies give about same or worse fuel economy than a 4.0 litre Falcon does in gas ! Just rty put a Falcon in 4WD lo

I hope they're all quotes for gas mileage Steptoe!

My old MPFI could easily get at least 10/100 all day every day. One time I drove it from Adelaide to Woodend with two in the vehicle plus our gear for a week. We did 730km to the tank. I quite tank as I didn't fill up to the brim, I put a Jerry in once at our mates place because I reckon we would've run out on our way home.

Pretty good economy until the engine popped

That race cam ea81 you speak of - is it still good for every day driving or do you have to ring it everywhere to make the most of it? I'd like to one day build up an ea81 like Tweety's but non carb. The balancing on that EA is awesome, VERY smooth!

Cheers

Bennie

+1 for putting a kit through the standard carby it made a world of difference for my EA82 3 speed. Went from using 12 -14 L per 100 on standard tyres to 9-10s in average with occasionally dipping in to 8L per 100 with really crusty old tyres.

Running 195/65R14s are a roof basket and spare on top of the roof I use around 12-13 L per 100 with a good mix of highway and city work and I am yet to give the auto a service. but I have found even without advancing the timing I am running 10 atm, 95 shell fuel is making mine run happier with more power than 91 shell fuel and is giving me more economy oddly though 98 makes me go backwards in economy guess id need to run about 15 in timing to see a benefit there.

of the two different grinds I have run - both are daily drivable racey but 20/60 hates the extra weights/loads or did hate the loads until I went EA82 Y pipe with cat. That was sorted then! . On petrol that engine gave 609km from full to sput sput on highway mostly...the 16/56 was the better of the grinds for lower down torque and power, just wanted to keep pulling up long hauls at 1$0 kph ! on petrol twins, points shy was not game to take it to the max !
If I was to build another NA EA81, would go the 16/56 .225" lift i think, and take Tweetys balance idea on board. I still have that cam, just the crank flexed a few too many times and whumped the middle of only three main bearing to make things sound a bit ugly - still ran, never let me down. The money could be better spent on an EJ20 AWD conversion and engineering though

Those 3 speed auto EA82...my T used to do 10 litres per 100 no matter what I did in it !

well mine is under 200 000 kms on the engine which might help a little, and the 2 inch custom exhaust with high flow cat running from the heads to the tip did improve it's economy to just slightly. running 175/70R13s to get around the 8-9L per 100, more highway driving it does the closer I get to that figure. Around town its 10-11 maybe the odd 12. With the 195/65R14s its 12-15L per 100 depending on the driving.