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TOPIC: ACCO 510A PERFORMANCE ISSUE

ACCO 510A PERFORMANCE ISSUE 02 Jun 2020 23:25 #211010

  • Abbuss
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Hi all,this is my first post on the Forum and firstly thanks for all the info that you have shared and I have found so useful.
I have owned a 1976 ACCO 510A since Jan 2019 and if I can help anyone with information about this vehicle they are welcome. I have fitted a Spicer 5831 auxilary box 0.73.1 OD,DIFF 4.3 and have only had it on the highway a couple of times and find the performance dissappointing. I am not an authority on this vehicle but thought according to manufacturers data "Torque Gross 411Nm at 2200 RPM" would mean if at 80Kph and 3700 RPM overdrive was engaged it would have the torque (or guts) whatever to get up and go 90 or 100 KPH on the flat without a load fairly easily. It has only done about 45000ks,it is tuned according to spec ,the OE Holley carb is running a little rich but I get 30litres/100Ks which is normal. Does anyone know if it should be able to perform better. I have read where bigger trucks than this used the 345 V8 with loads for example the D1610 and cruise all day at 100Ks (HCVC 30Aug 2014) Thanks in advance
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ACCO 510A PERFORMANCE ISSUE 03 Jun 2020 01:09 #211013

  • 180wannabe
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Hello Abbuss, and welcome.

My first impression is that your truck is geared wickedly fast for a V8 petrol, and that the 345 hasn't got enough power at low revs to pull it along, even on 17" tyres.

I think in top gear you would only be doing around 1800RPM at 60MPH.

We have a 345 in a C1820, 0.82 overdrive, 6.33 diff, 9.00 tyres and it will do 70MPH. At a more realistic 50MPH it returns 8MPG with a 3t load.

From what i have had to do with them, 2500-2700RPM seems their sweet spot for average road cruising, and running up to 3300RPM to have any power when loaded. I couldn't imagine our truck geared any faster without running out of puff.

The flywheel on these motors is not very heavy, and i wouldn't class them as a "torquey" engine.

There are bound to be more blokes here on the forum that have more working knowledge of them than me, hopefully you will get some helpful information over the next few days.

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ACCO 510A PERFORMANCE ISSUE 03 Jun 2020 03:50 #211015

  • Rattail 1927
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Hi and welcome, I own a 610A 4x4 with 10.00 R20s wheels, my truck will sit on 95 @ 3450 rpms.
I have the 5 speed fuller without overdrive , mine seems to go good , I have the standard 4x4 box and diffs, my diff ratio is 6.16 , I should mention mine doesn't have a tray body, just cab chassis , and at least your aware of the fuel economy figures , I thought I had a huge hole in the tank... lol .
As 180 said 2500-2800 its the sweet spot, just cruising with the engine nice and quiet and ...enjoying the ride ...
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ACCO 510A PERFORMANCE ISSUE 03 Jun 2020 12:32 #211032

  • Abbuss
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Thanks Wannabe and Rattail,forgive me if my replies and thanks arent in the right place I am new to this. So it seems as if it is a bit too highly geared. Maybe a lower diff would work .More money and time. Rattail can you tell me your diff ratio please Regards Abbuss

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ACCO 510A PERFORMANCE ISSUE 03 Jun 2020 16:41 #211039

  • JOHN.K.
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Dont mention tyre /wheel size?.........my 1310 with 7.50x16s and the same 4.3 ratio centre does 2800rpm at 100km/h......You can run the joey box in direct,then just a bit of oil churning power loss..........Incidentally ,the higher ratios in that diff (4.88,6.16) arent as strong gears,

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ACCO 510A PERFORMANCE ISSUE 03 Jun 2020 17:14 #211040

  • Rattail 1927
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I have the heavier 6.16 out of a 1610 a to put in mine, I look at it and say .. maybe tomorrow

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ACCO 510A PERFORMANCE ISSUE 03 Jun 2020 17:21 #211041

  • Lang
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These are the exact figures for 9.00 and 8.25 - 20 tyres. If you have different tyres let me know and I will work it out for you.

With the standard 4.3 diff in direct drive.

9.00 tyres and 100kph 2534rpm
80kph 2027rpm

8.25 tyres and 100kph 2591rpm
80kph 2073rpm

With the .73 reduction (effectively a 3.14 diff ratio)

9.00 tyres and 100kph 1850rpm
80kph 1480rpm

8.25 tyres and 100kph 1892rpm
80kph 1514rpm

Your whole deal looks just too high to me. The 345 is not a huge torque engine and only about 140/150hp.

Lang
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ACCO 510A PERFORMANCE ISSUE 03 Jun 2020 18:11 #211047

  • asw120
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Standard for these was 7.50x17, 4 speed direct and 4.88. A bloke I used to know had one he had put a 4.3 diff in. I drove it a few times. With a *very* tired engine it would not pull top gear with that diff on even the slightest incline, back to third.

Jarrod.
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Among those afraid of losing their ground
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ACCO 510A PERFORMANCE ISSUE 03 Jun 2020 18:46 #211048

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With the 7.50-17 tyres the speeds are:

4.3 Diff
100kph 2627rpm
80kph 2102rpm

With the .73 overdrive
100kph 1918rpm
80kph 1535rpm

Lang

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ACCO 510A PERFORMANCE ISSUE 03 Jun 2020 19:07 #211049

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Just looked at the factory power curves for the International 345

Maximum power 150 at 3,150RPM The curve stays flat right through to 3,400RPM then drops off.
Maximum Torque is 275ft/lb at 2,000rpm but drops off severely after that.

Just as a comparison the Perkins 6-354 (same size as the International but diesel)
Maximum power 120 at 2,800RPM (Red line)
Maximum Torque 260ft/lb at 1,750RPM but a very flat curve holding it over a much wider range than the International.

As a further comparison and to show how far engines have come my Navarra 550 3 litre (183 cubic inch) V6 has:
2oohp but the torque is fantastic at 405ft/lb about 40% more than the big International V8

Lang
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