Hi. Can any one please give me the strobe timing for a 998 with an R20 cam. Running twin 40’s?
I.e 12 degrees at 4000 rpm etc. Thanks.
Timing?
-
- Posts: 8
- Joined: Fri Feb 13, 2009 10:50 am
- Club Member: No
- Car Model: Sunbeam Imp Sport
- Location: Walsall, West Mids
- Contact:
-
- Posts: 1400
- Joined: Thu Aug 19, 2004 5:26 pm
- Club Member: Yes
- Car Model: all the above
- Location: Edinburgh, Scotland
- Has thanked: 151 times
- Been thanked: 243 times
Re: Timing?
You need a comp spec dizzy, time it to 36 degrees max advance at 4000 rpm and above
Scott
Scott
- Lotus-e-Clan
- Posts: 678
- Joined: Thu Aug 10, 2006 10:08 pm
- Club Member: No
- Car Model: 75Clan 1040BVSSH GB72 mapped ign DHLAs -Waterless!
- Location: North Yorkshire
- Has thanked: 10 times
- Been thanked: 10 times
Re: Timing?
Assuming you mean ignition timing ....Leedy wrote:Hi. Can any one please give me the strobe timing for a 998 with an R20 cam. Running twin 40’s?
I.e 12 degrees at 4000 rpm etc. Thanks.
If you have a proper competition curved dizzy - vacuum advance deleted - the dizzy should be set @ 36 degrees BTDC @ 4000- 4500 rpm.
Static timing should end-up @ 10 - 12 degs BTDC.
Same for all R- series cams. Tweak a degree or so either way to taste!
74 Clan Crusader 1040 Red 190 bhp/ton
-
- Posts: 8
- Joined: Fri Feb 13, 2009 10:50 am
- Club Member: No
- Car Model: Sunbeam Imp Sport
- Location: Walsall, West Mids
- Contact:
Re: Timing?
I have the Aldon automotive electronic dizy. Supplied by Ben Bolt. So according to Ben it has the correct weights etc for the R20 or 360 cams. I’ve just ordered an adjustable strobe light. So needed to know what to set it to. Going off your comments. I set the strobe light to 36degrees BTDC and revs at 4200 RPM? Been a long time since I did this. Lol. Thanks again.
- Lotus-e-Clan
- Posts: 678
- Joined: Thu Aug 10, 2006 10:08 pm
- Club Member: No
- Car Model: 75Clan 1040BVSSH GB72 mapped ign DHLAs -Waterless!
- Location: North Yorkshire
- Has thanked: 10 times
- Been thanked: 10 times
Re: Timing?
Yes exactly. I have the same Ben Boult /Aldon dizzy - but I'm using mapped ignition atm.Leedy wrote:I have the Aldon automotive electronic dizy. Supplied by Ben Bolt. So according to Ben it has the correct weights etc for the R20 or 360 cams. I’ve just ordered an adjustable strobe light. So needed to know what to set it to. Going off your comments. I set the strobe light to 36degrees BTDC and revs at 4200 RPM? Been a long time since I did this. Lol. Thanks again.
I marked my crank pulley at both 10 degs AND 36 deg BTDC with white dashes - to save messing - but you might use a different method.
- 1) Loosen dizzy clamp
2) Use a bulb or multimeter to set the static timing to 10 degs BTDC - I could do this with mine even with a electronic trigger. In fact I could hear a click from my trigger - no need for anything else.
3) Rev engine to (say) 4250 rpm and shine strobe on pulley mark
4) twist dizzy until engine TDC pointer and 36 deg mark on pulley align.
5) clamp up dizzy
6) double check to see exactly at what revs the 36 deg mark arrives at the TDC marker. I used to aim for 4000 rpm which means the curve will be more advanced than if set @ 4500 rpm. You find your own sweet spot after road testing.
5) recheck static timing for future reference.
- 1) Loosen dizzy clamp
74 Clan Crusader 1040 Red 190 bhp/ton
-
- Posts: 8
- Joined: Fri Feb 13, 2009 10:50 am
- Club Member: No
- Car Model: Sunbeam Imp Sport
- Location: Walsall, West Mids
- Contact: