Unclejake Posted August 18, 2008 Author Share Posted August 18, 2008 Shanks were good! Had potatoes too Your suggestion makes sense. Let me get a photo to be certain we are talking about the same thing but at this stage I think increasing the air gap would require cutting the steel posts that 'activate' the trigger/reluctor. I am grateful for the advice. I will get a photo tomorrow and post it on Wednesday. Quote Link to comment Share on other sites More sharing options...
Guest vvega Posted August 18, 2008 Share Posted August 18, 2008 cant cut the posts but you could reshape the ramp... the ramps just conditioning anyways IMO keen on pics glad i can help anythign good to eat tonight ? we had hotdog's and chips...yum Quote Link to comment Share on other sites More sharing options...
Unclejake Posted August 18, 2008 Author Share Posted August 18, 2008 Nah - nothing nice to eat. CBF eating really - I only get hungry once a day. I will be in touch Wednesday. We will sort this you and I. I will owe you Quote Link to comment Share on other sites More sharing options...
Unclejake Posted August 18, 2008 Author Share Posted August 18, 2008 Just to make certain I have this right in my head: On the compression stroke Advanced timing fires the spark closer to BDC and Retarded timing firse the sparke closer to TDC? Quote Link to comment Share on other sites More sharing options...
forced Posted August 18, 2008 Share Posted August 18, 2008 You realise that with your setup the HT will never exceed 2 to 3 Kv. With that there's a possibility that your timing light might not be triggering properly. In a "real" motor the HT will go up to maybe 25Kv under load. I'd be doing a comparison with a "stock " cortina dizzy. Steve Quote Link to comment Share on other sites More sharing options...
Unclejake Posted August 19, 2008 Author Share Posted August 19, 2008 ^ Do you mean that the same distributor installed in an actual engine is going to have a stronger spark than on the test rig? Quote Link to comment Share on other sites More sharing options...
Guest vvega Posted August 19, 2008 Share Posted August 19, 2008 i see whats forced is sayng becauae the real motor has compression there is more resistance in the spark gap so in real world it will load up more and make more voltage to arc across the airgap could be simulated by just increasing teh spark gap or putting a large ballist on the earthing plate though this would show as a inconsistant spark or a weak spark ......it shoudlnt change the timming its a reluctor setup so the trigger isnt dependant on the coil/points at all if your static timming was 0 advanceing would be BTDC retarding woudl be ATDC hope this helps Quote Link to comment Share on other sites More sharing options...
Unclejake Posted August 19, 2008 Author Share Posted August 19, 2008 The signal to the timing light seems fine except at very low RPMs (on the test rig). Now that I have the rotor phasing right the signal is steady - even at 8,000 RPM The issue is this retard at medium revs. Photos will be taken tonight and we can look at widening the air gap to possibly solve the problem. Quote Link to comment Share on other sites More sharing options...
Guest vvega Posted August 19, 2008 Share Posted August 19, 2008 Quote Link to comment Share on other sites More sharing options...
KKtrips Posted August 19, 2008 Share Posted August 19, 2008 i see whats forced is sayngbecauae the real motor has compression there is more resistance in the spark gap so in real world it will load up more and make more voltage to arc across the airgap could be simulated by just increasing teh spark gap or putting a large ballist on the earthing plate though this would show as a inconsistant spark or a weak spark ......it shoudlnt change the timming its a reluctor setup so the trigger isnt dependant on the coil/points at all if your static timming was 0 advanceing would be BTDC retarding woudl be ATDC hope this helps tis true - one thing I learned from Sefton was you may get a decent spark out of a plug at 1 atmosphere but with compression it may misfire.. not too sure how or if it will affect the timing because the signal should be the same but it will definetly affect the actual spark intensity at the plug electrode.. Quote Link to comment Share on other sites More sharing options...
Unclejake Posted August 19, 2008 Author Share Posted August 19, 2008 ^ You should come take a look at the weirdness tonight. You going to be there sweetie? Quote Link to comment Share on other sites More sharing options...
KKtrips Posted August 19, 2008 Share Posted August 19, 2008 doing din dins first but perhaps at 10ish will be going home Quote Link to comment Share on other sites More sharing options...
Unclejake Posted August 19, 2008 Author Share Posted August 19, 2008 K - I might be there then - possibly will have already left in despair of barking dogs. Later. Quote Link to comment Share on other sites More sharing options...
KKtrips Posted August 19, 2008 Share Posted August 19, 2008 sounds plausible Quote Link to comment Share on other sites More sharing options...
forced Posted August 19, 2008 Share Posted August 19, 2008 The magnetic pickup (hall effect) has a slight fixed delay to it. The rise time in the coil also causes a slight fixed delay. The higher the voltage before current flows, the more delay. So at low rpms, only a small fraction of a degree. Higher rpms, more degrees more voltage, more degrees. As for coming right at the top end, I'll pass on that, too hard. Steve Quote Link to comment Share on other sites More sharing options...
Guest vvega Posted August 19, 2008 Share Posted August 19, 2008 reluctor is different to hall effect as well as been a cdi setup anyways not here to argue basic's uj ill pm you my number Quote Link to comment Share on other sites More sharing options...
Unclejake Posted August 19, 2008 Author Share Posted August 19, 2008 Here is a photo. This is the EXACT moment the spark appears. Don't forget the distributor runs anti clockwise and I have phased the rotor timing within a degree or two of perfect by observing the rotor with a timing light and a hole in the dizzy cap. My problem is several degrees of retard as the dizzy spins faster Look at the reluctor (or trigger??) - reckon I need a balast resistor??? By unclejake, shot with DSC-R1 at 2008-08- Quote Link to comment Share on other sites More sharing options...
Unclejake Posted August 19, 2008 Author Share Posted August 19, 2008 More detail here. Again - this is the eact moment of the spark discharge. I am feeding at least 12 volts to the coil. There is NO chance that the retard is mechanical. By unclejake, shot with DSC-R1 at 2008-08-19 Quote Link to comment Share on other sites More sharing options...
Guest vvega Posted August 19, 2008 Share Posted August 19, 2008 you supply power to the dizzy at all ? just makign sure subaru is a vr setup Quote Link to comment Share on other sites More sharing options...
Unclejake Posted August 19, 2008 Author Share Posted August 19, 2008 you supply power to the dizzy at all ?just makign sure subaru is a vr setup I don't know what 'vr' is sorry. I have been supplying power to the dizzy as per the way I wired the race car. That wiring system is replicated on the test rig without the MSD gear. You can't really get it wrong with those dizzys as the don't sparj at all if the polarity is wrong. The dizzy is ex. Subaru Leone The spark looks great. It is just the rising retard that shits me Quote Link to comment Share on other sites More sharing options...
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