Ian Longhurst Posted September 24, 2002 Share Posted September 24, 2002 Can anyone help? Does anyone know how many degrees I need to set my timing to? 1992 Super seven 1700 XFlow, Fast road cam, dry sump etc, built by arrowstar apparently! Burton suggested between 12 and 14 degrees at tickover. Link to comment Share on other sites More sharing options...
Graham Sewell Posted September 24, 2002 Share Posted September 24, 2002 Sounds about right if you have the Aldon dizzy (unleaded) Low tech luddite - xflow and proud! Link to comment Share on other sites More sharing options...
Joe 90 Posted September 24, 2002 Share Posted September 24, 2002 My engine is similar and I set mine to 12 degrees at idle. 99,000 miles so far Link to comment Share on other sites More sharing options...
Graham Perry Posted September 24, 2002 Share Posted September 24, 2002 If you look in the archive there is plenty on this. It can be said that the static timing is irrelivant if you want power. Some say that for power aim for a maximum of 35 degrees of mechanical advance when being revved hard 4500-5500 and ignore what the dizzy does static, however its not as simple as that, as it depends if you have a leaded or unleaded dizzy. There was a good thread in May 2001 where this was discussed called "timing figures 1700 cross flow", where Roger King clarified the issue nicely Edited by - Graham Perry on 24 Sep 2002 16:20:43 Link to comment Share on other sites More sharing options...
Roger King Posted September 24, 2002 Share Posted September 24, 2002 You need to be careful here if you've got one of the 'unleaded' distributors. This would be a standard fit on an engine of this age if it was supplied by Caterham. If you have one of these (look for UL or ULS scratched on the body), and you set it for maximum power (typically around 34 degrees at 4500rpm) you will have MUCH TOO MUCH ignition advance at lower revs and idle. If, on the other hand you set it to the official 14 degrees at idle you may well be 10 degrees lacking at higher revs. Basically, this means that the 'unleaded' distributor is a load of poo. We never use them, even on engines converted for unleaded petrol. Bear in mind that I don't know the spec of your engine or distributor, so all the above should be treated with caution. Link to comment Share on other sites More sharing options...
dmc Posted September 24, 2002 Share Posted September 24, 2002 Ign timing on a crossflow could be as high as 37 degrees max advance (some where between 4000rpm and 5000rpm) with an idle advance around 20 degrees a really efficient crossflow could have it's max advance at 32 degrees. so you've got 5 degrees to play with there. better still get it setup on a rolling road!! Link to comment Share on other sites More sharing options...
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