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Author Topic: Ignition amplifier  (Read 8534 times)
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lancialulu
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« Reply #15 on: 18 November, 2015, 02:22:33 PM »

It's very interesting stuff. One thing which puzzles me is how do you physically adjust the dwell?
dwell is a funtion of mark space of the open close of the contacts so its a function of the contact gap. Electronic systems such as luminition does this electronically through timing circuits.
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Its not the winning but taking part! or is it taking apart?
Lancias:
1955 Aurelia B12
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1972 Fulvia 1600HF
1972 Fulvia 1600HF
1983 HPE VX
1988 Delta 1.6GTie
1998 Zeta 21.  12v
fay66
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« Reply #16 on: 18 November, 2015, 04:02:07 PM »

System fitted to Fay since 2007 with no problems, I did as suggested and fitted a new set of points and plugs.

Brian
8227 Cool


* Transistor Ignition K2543-Velleman-Kit for Cars 004.jpg (351.06 KB, 2352x1648 - viewed 437 times.)

* Transistor Ignition K2543-Velleman-Kit for Cars 001.jpg (752.35 KB, 2320x1600 - viewed 401 times.)

* Transistor Ignition K2543-Velleman-Kit for Cars 002.jpg (706.5 KB, 2320x1600 - viewed 433 times.)

* Transistor Ignition K2543-Velleman-Kit for Cars 003.jpg (357.45 KB, 2320x1600 - viewed 1248 times.)
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Own 1966 Fulvia 2C Berlina since 1997, back on road 11-1999.Known as "Fay"
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lancialulu
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« Reply #17 on: 18 November, 2015, 04:23:43 PM »

System fitted to Fay since 2007 with no problems, I did as suggested and fitted a new set of points and plugs.

Brian
8227 Cool
Dwell should be checked from time to time with this as heal of points will possibly wear closing the gap (and retarding the ignition) only relevant for mega miles....Dwell is simple - I have a dwell meter bought at the time colourtune was all the rage. Clip across the points and get instant satisfaction that all is well with the ignition system...
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Its not the winning but taking part! or is it taking apart?
Lancias:
1955 Aurelia B12
1967 Fulvia 1.3HFR
1972 Fulvia 1600HF
1972 Fulvia 1600HF
1983 HPE VX
1988 Delta 1.6GTie
1998 Zeta 21.  12v
RobD
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« Reply #18 on: 18 November, 2015, 05:31:43 PM »

I've never fully understood what a dwell meter did until now... http://www.howacarworks.com/ignition-system/checking-the-dwell-angle

I'm going to buy one!
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You're all entitled to my opinion.
'75 Fulvia 1.3S
'68 works Laverda 125cc ISDT
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lancialulu
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« Reply #19 on: 18 November, 2015, 06:00:56 PM »

I did chuckle when it said fit a NEW distributor!! Fat chance on a Fulvia
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Its not the winning but taking part! or is it taking apart?
Lancias:
1955 Aurelia B12
1967 Fulvia 1.3HFR
1972 Fulvia 1600HF
1972 Fulvia 1600HF
1983 HPE VX
1988 Delta 1.6GTie
1998 Zeta 21.  12v
RobD
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« Reply #20 on: 18 November, 2015, 06:35:09 PM »

Indeed Tim, I was very pleased to buy a Marelli dizzy in mint condition last week which is destined for my new engine . I'd looked at the 123 unit but rejected it on the grounds that by the maker's admission, wear rates on the cap was quite high. This is how I came to be researching ignition amplifiers and Utterly Butterly containers...
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You're all entitled to my opinion.
'75 Fulvia 1.3S
'68 works Laverda 125cc ISDT
KTM 640 Adventure
Yamaha TDM 900
Numerous Gas Gas trail bikes...
www.adventureride.co.uk
frankxhv773t
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« Reply #21 on: 18 November, 2015, 10:54:06 PM »

Reading "how a car works" on the use of dwell meters I can't see how you can get readings for different cylinders. Surely the meter averages the dwell over all the lobes of the distributor cam.

Frank T
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peteracs
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« Reply #22 on: 19 November, 2015, 05:35:30 AM »

I've never fully understood what a dwell meter did until now... http://www.howacarworks.com/ignition-system/checking-the-dwell-angle

I'm going to buy one!

Assuming the disti has good bearings, and the points are not burnt etc, isn't the same result obtained by setting the gap according to the manual and then using a strobe light to set the timing?

From what I can see the only plus may be to pickup the variance due to a worn disti?

Peter
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stanley sweet
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WWW
« Reply #23 on: 19 November, 2015, 09:47:17 AM »

Are new dizzy's for Fulvias totally unavailable then? I'm surprised going by what seems to be an increasing number of parts remade.
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Neil
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« Reply #24 on: 19 November, 2015, 11:15:58 AM »

Yes you can buy a 1,2,3 unit, but that is not a remade Marelli dizzy, I have one it is not cheap, but does a good job.
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Neil   
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1973 Fulvia S2 1.3
frankxhv773t
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« Reply #25 on: 19 November, 2015, 09:14:58 PM »

"Assuming the disti has good bearings, and the points are not burnt etc, isn't the same result obtained by setting the gap according to the manual and then using a strobe light to set the timing?"

Setting the points gap is an indirect method of setting the required build up of charge in the coil. The angle of dwell is what you are trying to set, so using a dwell meter is the direct and most accurate approach. Also the dwell meter measures dynamically whereas a feeler gauge can only be used statically. The instructions in "how a car works" cover initial setting, resetting after a bedding in period for new points and explains how using a dwell meter is accurate even when the points are well used.

Frank T
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RobD
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« Reply #26 on: 20 November, 2015, 12:55:39 PM »

Reading "how a car works" on the use of dwell meters I can't see how you can get readings for different cylinders. Surely the meter averages the dwell over all the lobes of the distributor cam.

Frank T

Absolutely right Frank and as Peter quite rightly points out, it's main benefit is enable wear in the dizzy to be compensated for by adjustment.
Measuring each event, which is what I'm interested in, requires an oscilloscope rather than a simple meter.

Yesterday I had all this explained to me by an older , wiser man... Grin 
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You're all entitled to my opinion.
'75 Fulvia 1.3S
'68 works Laverda 125cc ISDT
KTM 640 Adventure
Yamaha TDM 900
Numerous Gas Gas trail bikes...
www.adventureride.co.uk
peteracs
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Posts: 833



« Reply #27 on: 20 November, 2015, 01:29:08 PM »

Hi All

As a pure coincidence I had occasion to look at the current offering of oscilloscope add ons for Laptops. Amazing what you can buy now starting at 16.69 delivered...

Not a great sampling speed, but there are 20Mhz versions starting at around 40, even cheap ones with LCDs for around 25....

See

http://www.ebay.co.uk/itm/2-Channel-PC-Computer-Digital-Storage-USB-Oscilloscope-Probe-CD-/121401801984?hash=item1c441c7d00:g:ASQAAOSwQItT3zw1

http://www.ebay.co.uk/itm/Mini-Pocket-AVR-DSO150-Digital-Storage-Oscilloscope-USB-Probe-Kits-/141748299975?hash=item2100db68c7:g:2rMAAOSw-jhUJ6SR

http://www.ebay.co.uk/itm/HANTEK-6022BE-PC-Based-USB-Digital-Storag-Oscilloscope-2-Channels-20MHz-48MSa-s-/271543870829?hash=item3f3946a56d:g:6yIAAOSwbqpTvPUf

I still have an big old HP analogue one from the 70/80s (not powered up for a few years now), hate to think what it originally cost new, I bought it 15+ years ago second hand for around 200 from memory.

Peter

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Beta Spyder S2 pre F/L 1600
Beta HPE S2 pre F/L 1600
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