Azzvan

[jesus_is_alright]

So the van has been tuned and cruises much better now. only problem, is when turning the van off, it runs on every now and then, and i have to drop the clutch to stall it. not a smooth look. Why is this?
Other than that, it runs really smooth and revs nicely at 100/110kph.
Gonna go for a sunday drive to Pt Broughton tomorrow, (about a 500km round trip) 100kph on the way up and 110kph home to work out the economy and how much Fuel/money i'm saving after spending so much on transmission, diff, wheels, tyres etc.

My target to beat is 14l/100km as thats what i was drinking before, mind you that was at 80kph. Ahh, its good to go fast.

[Numnutz]

I find if I run the higher octane premium unleaded petrol it doesn't happen to often, also try adjusting the timing a little bit, that will help.

[Worby876]

Sounds like post ignition..looking on google here are a number of causes..
carbon in the head still glowing ...spark plugs too hot...timing not right...
poor petrol condition...wrong octane level ...

[jesus_is_alright]

Thanks, um yeah its probably timing, ill chat to the guy who tuned it up. I run standard pump fuel, usually bp, and a valve master lead replacement/additive.
Numnutz, have you painted your van yet?

[Worby876]

Ive been researching problems with HEI ignition and coils etc on OLD HOLDEN . COM
and found this which might be helpful for your situation.
High Compression Ratios, Detonation, Pre-Ignition and Advance:
My Pre-Ignition and Detonation experiences have been interesting, so if you don't mind I'll give you the full answer. There's a general policy to back off the advance to stop or mimimise Pre-Ignition and Detonation and I've found maximising advance provides the best answer. All the Blue Sixes pull on the same degree of Mechanical Advance, they just use heavier or lighter springs to invoke that advance sooner or later. I use the lightest balance weight springs. Bosch can advise on these. The EFI VK (Black Motor) Distributor pulls on only half the mechanical advance of the Blue Distributors, which is why the static setting is 12 degrees as opposed to the normal 6 degrees. The Vacuum Advance Module I use has 230 stamped on it. The 2 is the diaghram's internal spring tension and the 30 equates to 3.0mm of travel from relaxed to fully activated. The degree of travel determines the amount of advance pulled on by the module. The bigger the number, the further the module pull rod travels under full vacuum and the further the HEI stator ring gets pulled around resulting in more advance. The standard Blue Distributor Vacuum advance will have 212 or 214 stamped on it. That means a spring tension or 2 and 1.2mm or 1.4mm of travel. These numbers are pretty tame compared to what the engine can take. When you look at the Advance Module, you'll see that the 1.2mm relates to the length of a nick cut into the Module's pull rod. A 214 will have a longer nick and a 230 will have an even longer nick. I believe it may be possible to file a Module's movement nick wider to make it travel further. It's something I've never tried but I could believe it would achieve the same result. I've also seen modules with 165 stamped on them which may be an imperial measurement, but those also had a heavy spring and very limited travel. If a distributor has one of these I'd expect heavy detonation from the engine. The GM Part number for the 230 Vacuum Advance Module is VS 141414, that is if they are still available, but a recent poster claimed that Bosch HEI Distributors can be bought brand new for around $250. The VS 141414 Module produced a pleasant increase in performance and economy. A rumour had it that this module was the standard V8 module. There will always be a lot of debate about pre-ignition and detonation since there are many variables involved. My experience has been that combustion chamber deposits are the biggest cause and that running the engine at peak efficiency will burn the combustion chamber clean and deliver power free of detonation and pre-ignition. I am a great believer in GM wedge combustion chambers because they can accept much more advance than other combustion chamber designs. I've found Alfa Romeo hemi's to be particularly susceptible. Detonation came in heavily when GMH were forced to detune their engines to meet emission requirements, i.e around HX. My HZ in standard form used to detonate and pre-ignite for fully 30% of any Sydney-Canberra-Sydney run I did. The issue could be managed by flooring the accelerator, backing off, or partially activating the choke. After increasing the spark energy and the spark advance in steps, the pre-ignition and detonation vanished so I've operated on the basis of keeping maximum advance and spark energy ever since. EGR pays detonation control dividends too. I've run my engines with and without it and found that running with it delivers the best power and economy. The thing I've found with detonation and pre-ignition is not to run away from it. The weaker the ignition and the fewer degrees of advance the more combustion chamber deposits form and the worse the detonation will be. I use Caltex Vortex. In addition to being the right octane rating, it has washed years of accumulated EGR ash out of the inlet manfifold and delivered on all their promises over the 9 months I've used i

[Numnutz]

Not yet, I keep finding little bits that could be better. hopefully get a few coats on it tomorrow.

[jesus_is_alright]

Ok, the numbers are in, and they are surprising.,

Drove 299.5km for my house to Pt Germain and back to Pt Pirie, at 100kph when the speed limit allowed it.
During this portion of the trip i consumed 38.52L which gives me 12.86L/100km @100kph

Filled up at Pt Pirie and drove home, this time at 110kph. From Pirie to Pt Wakefield, 110kph was hard to reach because of a reasonable head wind, but this died off then after Pt Wakefield, and 110kph was quite easy after that.
The result of this head wind meant i used 34.12L on the 211km trip home, which works out at 16.17L/100km @ 110kph

This is 3.31L/100km more or just over 25% more fuel used for a speed increase of 10km/h (10%) Soo not worth it


Also found out that my speedo is still 3.3% fast, but this is much better than the 28.3% out it was before.

A few more things to note, drivers window was down the whole trip, Van was practically empty, except for a few tools, and i used BP 91 fuel the whole trip, topping up my lead replacement additive with each fill

[Worby876]

I did that run last year year in a rental as I drove all around the Ayer peninsular visiting some of our
listeners and supporters its a nice stretch of road.


The photo of you Van is terrific...you have a really sweet looking Beddy   well done.

[Jeff]

I agree....  really neat van! 

[gazza]

NICE PICTURE OF A NICE BEDDIE,,,,,MATE WELL DONE