6 replies to this topic

[Bazza]

Hi all


I understand that there were a number of differences between the standard and XU1 distributors chiefly; cam profile and spring weight. What did these differences mean in terms of performance? Were there any other important differences?

Thanks

Bazza

[makka]

as devils said, they basically had a different advance curve afaik.

[Bazza]

Thanks folks



Needless to say that the original item is as rare as. I was trying to establish what would be needed to replicate as near as possible the original specs. I have seen the heavier XU1 dizzy springs on eBay and I presume that it is possible to get the double spring contact sets.

I suppose the orginal specs would only be of value under racing conditions.

Bazza

[Dangerous]

Dunno about the LJ XU-1, but the LC XU-1 dizzy was pretty much the same as the GTR one, except for points with a heavier spring, which I think Bosch still make.

From the LC parts manual,

The dizzy points cam was different for the GTR and XU-1 than the 'stock' sixes, ie GTR and XU-1 shared one type and all others shared another type.

Light counterweight spring was common to all, ie2250, 2600 and 186X, and heavy spring was same as GTR.

[WhiteA9XS]

diaphram is also different

[FastEHHolden]

I have an advance graph somewhere for an XU1 dissy..somewhere...I haven't seen it for about 10 years...i seem to remember it had 28 degrees advance???