35DLM8 mechanical advance

[landy_v8]

Hi Guys,

When replacing my points dizzy with a 35DLM8 I noticed it had a sleeve over the stop for the bob weights. I assume this effectivley reduces the max mechanical advance a bit. Would there be any benefit from removing the sleeve (It comes off easily enough) or should I leave it alone?

On a 3.5L with 8.35:1 CR and SU Carbs what should be the max advance and at what RPM?

Cheers

Jon

[badger]

Leave the sleeve fitted to restrict the total advance and set the timing at idle (no vacuum) to about 10 degrees BTDC - this will give good pickup at low rpm's with the low compression engine without running the risk of high-speed pinking.

[Paul B]

Hi Guys,

When replacing my points dizzy with a 35DLM8 I noticed it had a sleeve over the stop for the bob weights. I assume this effectivley reduces the max mechanical advance a bit. Would there be any benefit from removing the sleeve (It comes off easily enough) or should I leave it alone?

On a 3.5L with 8.35:1 CR and SU Carbs what should be the max advance and at what RPM?

Cheers

Jon

I have heard several times that Rover run notoriously feeble mechanical advance, and usually need some mods to get the full power out of them, but, it is all stuff i have heard/read and I have no dyno figures to back it up. here's an article you might want to read.

http://www.seight.com/ignition.html

I could not get more than about 18 degrees of mech advance on my SD1 motor, until I fitted some softer springs from Real Steel and also ground a little off the bob-weight stop, then I could get 30 degrees full mech advance (and still have 6 degrees at idle, as recommended in the Rover spec).

You might find yours is restricted even further as with that low C/R it is probably designed to run safely on rubbish quality petrol in some third world country.

[landy_v8]

Thanks for the replies.

You might find yours is restricted even further as with that low C/R it is probably designed to run safely on rubbish quality petrol in some third world country.

The engine is from a 101 Land Rover Gun Tractor so was designed to run on crap fuel. The dizzy is from an EFI Range Rover that I think had a CR of 9.35:1 so not sure what advance it should have.

Is there a way of measuring the advance a dizzy will give?

Cheers

jon

[Paul B]

Thanks for the replies.

You might find yours is restricted even further as with that low C/R it is probably designed to run safely on rubbish quality petrol in some third world country.

The engine is from a 101 Land Rover Gun Tractor so was designed to run on crap fuel. The dizzy is from an EFI Range Rover that I think had a CR of 9.35:1 so not sure what advance it should have.

Is there a way of measuring the advance a dizzy will give?

Cheers

jon

I'd imagine you could set it up on the motor, strobe it at idle, (say 6 degrees btdc at 600rpm) then wind it up to 4000rpm and strobe it again. I know my '84 SD1 dizzy was giving barely 22 degrees like that. Now I have modded it it gets some 36 or thereabouts.