V8 with Carby-Timing

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Originally Posted by loanrangie

Back when i had my RRC's i would run 12 on lpg and 10 on petrol, this was with a scorcher bosch dizzy.

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This is the one I think.

AEB Timing advance processor 526N Wolf LPG | Tinley Tech

throttle response seems much better. I'm not sure about outright power (you haven't increased the compression ratio after all :) )..... Oh, they DON'T like getting wet [bighmmm] .... guess how I ffigured that one out [bigwhistle] )

If you are running higher compression, (because of longer stroke), you will probably need the distributor re-calibrated. I put high comp pistons in my Jaguar and the thing ran like a dog. It needed more advance at low revs, and less advance at high revs. Seemed like a different car.

Discussed this with Performance Ignition in Nunawading who rebuilt my dizzy plus used to do the scorchers. Their advice was to check what was TOTAL advance at cruise speeds say 2500rpm. You should have about 34-36degrees total advance. And set static to ensure you have correct total advance when running at cruise speed. So if dizzy can provide for example 20 degrees additional advance ( both mechanical and vacuum) then set it at 14 degrees BTDC. I invested in one of the timing lights that allows you to run light back to TDC and it shows how much advance is there. Plus shows rpm etc. Mine is currently running 14 BTDC and its running well.

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Originally Posted by Meccles

Discussed this with Performance Ignition in Nunawading who rebuilt my dizzy plus used to do the scorchers. Their advice was to check what was TOTAL advance at cruise speeds say 2500rpm. You should have about 34-36degrees total advance. And set static to ensure you have correct total advance when running at cruise speed. So if dizzy can provide for example 20 degrees additional advance ( both mechanical and vacuum) then set it at 14 degrees BTDC. I invested in one of the timing lights that allows you to run light back to TDC and it shows how much advance is there. Plus shows rpm etc. Mine is currently running 14 BTDC and its running well.

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That applies to running on petrol I assume.

DL

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Originally Posted by DoubleChevron

This is the one I think.

AEB Timing advance processor 526N Wolf LPG | Tinley Tech

throttle response seems much better. I'm not sure about outright power (you haven't increased the compression ratio after all :) )..... Oh, they DON'T like getting wet [bighmmm] .... guess how I ffigured that one out [bigwhistle] )

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No fancy lpg electronics just an impco system and the bosch single points dizzy that my dad fitted to his rrc then i found it in the shed and put in mine.

Yep and I use 95 octane

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Originally Posted by Meccles

Yep and I use 95 octane

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With a low compression motor ?? .... Just throw the cheapest crap in it you can find :) .... the thing would probably nearly run on kero with such low compression :D

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Originally Posted by Meccles

Yep and I use 95 octane

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Why - just a waste - the fuel is no more "powerful" just allows timing to run a few degrees BTDC.

I always had best success with 8 deg BTDC at idle, vac pipe off.

By the way, if you want more easy hp, fit a set of SU carbs they'll go straight on.
Find them on any Rover 3500 car

Worth around 10-12 hp, and if you can find a set of HIF6 SU's (with float chambers underneath, not on side) they will give a few more hp.

The Rover 3500 cars from approx 1974 on had HIF6's; they are a nice carby, but check the plastic floats as they are known to leak at the seam.

Only reason why RR had the Strombergs was that they complied with emission laws easier than the SU, but the trade-off was less hp.

MIDEL at Lakemba in Sydney will sell you a new set.........$$$$$$$

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Originally Posted by Discodicky

I always had best success with 8 deg BTDC at idle, vac pipe off.

By the way, if you want more easy hp, fit a set of SU carbs they'll go straight on.
Find them on any Rover 3500 car

Worth around 10-12 hp, and if you can find a set of HIF6 SU's (with float chambers underneath, not on side) they will give a few more hp.

The Rover 3500 cars from approx 1974 on had HIF6's; they are a nice carby, but check the plastic floats as they are known to leak at the seam.

Only reason why RR had the Strombergs was that they complied with emission laws easier than the SU, but the trade-off was less hp.

MIDEL at Lakemba in Sydney will sell you a new set.........$$$$$$$

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But if the Strombergs are tuned correctly they will match the SUs in the same circumstances. Stromies were tuned for emissions where the earlier SUs were tuned for power as emissions generally did not apply back then.