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
LJ XU1 distributor
Started by
Bazza
, Jun 14 2006 05:08 PM
6 replies to this topic
#1
Posted 14 June 2006 - 05:08 PM
#2 _devilsadvocate_
Posted 14 June 2006 - 07:24 PM
Dont know anything specific about the xu1 dizzy, though:
Possibly you are right, the lumpier cam in the xu1 possibly would dictate that less mechanical advance, (more intitial) would be needed and heavier springs used on the centrifugal advance mechanism. Possibly less vacc advance too.
Possibly you are right, the lumpier cam in the xu1 possibly would dictate that less mechanical advance, (more intitial) would be needed and heavier springs used on the centrifugal advance mechanism. Possibly less vacc advance too.
#3
Posted 15 June 2006 - 12:34 AM
as devils said, they basically had a different advance curve afaik.
#4
Posted 15 June 2006 - 01:44 AM
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
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
#5
Posted 20 June 2006 - 01:24 PM
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.
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.
#6
Posted 29 June 2006 - 09:26 PM
diaphram is also different
#7
Posted 29 June 2006 - 09:53 PM
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???
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