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PostPosted: Mon Sep 10, 2018 10:25 pm 
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research continues

https://youtu.be/g_dVkDq9-4A


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PostPosted: Tue Sep 11, 2018 12:29 pm 
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robertXX wrote:
Contemplating the misfiring on the rear engine. . I am using a jag xjs distributor with electronic pickup

So if the toothed wheel normally flies past a powerful magnet just before the pickup when going normal ccw , what happens to the signal if the magnet is after the pickup gong cw ?

Are you wondering if this could retard timing and/or the shape of the signal might be different and cause misfires?

Would think that if all exhausts are the same temp mixture on each cylinder would be similar enough for lambda to be useful. Dunno about using separate adjusters on each cylinder though, might then find you see similar temps under only a narrow range of operation... but that might be a problem even without separate adjusters.

Could you swap dizzies between engines to see if the misfires on the back engine go away when it has the front engine dizzy?

Clicked on the Youtube vid, saw it was 35 mins long, will have to watch it later.

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PostPosted: Tue Sep 11, 2018 3:21 pm 
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LPGC wrote:
robertXX wrote:
Contemplating the misfiring on the rear engine. . I am using a jag xjs distributor with electronic pickup

So if the toothed wheel normally flies past a powerful magnet just before the pickup when going normal ccw , what happens to the signal if the magnet is after the pickup gong cw ?

Are you wondering if this could retard timing and/or the shape of the signal might be different and cause misfires?


yes simon , or even, if it requires the flying past the magnet to get magnetised and so trigger the pickup coil ,could the faster it goes mean it gets less and less magnetised and the signal gets degraded ?

Would think that if all exhausts are the same temp mixture on each cylinder would be similar enough for lambda to be useful. Dunno about using separate adjusters on each cylinder though, might then find you see similar temps under only a narrow range of operation... but that might be a problem even without separate adjusters.

Could you swap dizzies between engines to see if the misfires on the back engine go away when it has the front engine dizzy?

that's a good idea ,thank you .

Clicked on the Youtube vid, saw it was 35 mins long, will have to watch it later.



yes it got a bit involved sorry :)


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PostPosted: Tue Sep 11, 2018 8:13 pm 
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robertXX wrote:
UPDATE .

vap balance pipe to front of car caused surging . ign timing reset to 15 static and 28 total .much more powerful now . mpg was 3.77 on the way to blenhiem palace car show , after timing setting now above 5 mpg ,still v rich . may take out 25mm rings ,since front engine tap fully shut .

need a) msd ignition B) seperate adjuster taps on each cylinder .



if i can adjust all cylinders to similar temps ,then i can trust the wide band sensor as representative of all cyls ?

anyone got a propane afr temp graph ? i assume it gets hotter the richer it is then cools off like a oxy flame .



One cars with more than 1 carb I have always found it best to have one adjuster before the LPG feed splits to the carbs.

The more adjusters you have the more of a mare things are to setup

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PostPosted: Wed Sep 12, 2018 9:24 am 
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Hi Dai, are you a mod yet?

I started watching the vid last night... cast it to the big screen, got past Winter Wonderland whistling but then the internet went down and the screen froze. Very interesting stuff, far better than anything else the kids might've put on lol.. But I'd want to watch it again and in full before commenting on any aspects.

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PostPosted: Wed Sep 12, 2018 4:35 pm 
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Yes now a MOD so can edit your posts lol.

Not watched the vid as yet but will do once on the PC.

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PostPosted: Wed Sep 12, 2018 9:46 pm 
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classicswede wrote:
Yes now a MOD so can edit your posts lol.

Not watched the vid as yet but will do once on the PC.


Nice one!

Or should I say oh bolx! Lots of fun editing each others posts before when there was that issue on the installers section... but now you can edit mine actually on forum and I can't edit yours I'd better keep checking my posts eh ;-) lol. Long time no chat Dai, we should catch up.

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PostPosted: Fri Sep 14, 2018 4:05 pm 
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classicswede wrote:
robertXX wrote:
UPDATE .

vap balance pipe to front of car caused surging . ign timing reset to 15 static and 28 total .much more powerful now . mpg was 3.77 on the way to blenhiem palace car show , after timing setting now above 5 mpg ,still v rich . may take out 25mm rings ,since front engine tap fully shut .

need a) msd ignition B) seperate adjuster taps on each cylinder .



if i can adjust all cylinders to similar temps ,then i can trust the wide band sensor as representative of all cyls ?

anyone got a propane afr temp graph ? i assume it gets hotter the richer it is then cools off like a oxy flame .



One cars with more than 1 carb I have always found it best to have one adjuster before the LPG feed splits to the carbs.

The more adjusters you have the more of a mare things are to setup




hmm good point , i am hoping i can balance things out with the separate taps , then leave them and use the single tap to the globes to adjust from then on ...time will tell !


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PostPosted: Sat Sep 15, 2018 8:51 pm 
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As implied by myself and Dai, the problem then can be that balancing individual cylinder fuel/air ratio is problematic, you get things right at a particular rpm and engine load but things are different under other circumstances. Fitting individual cylinder / cylinder group adjustments can mask underlying issues at a certain rpm and load but can't often mask an underlying issue... I.e. Which pipe flows more and at what frequency/rpm, a nominally straight 6mm ID pipe 10 inches long or a nominally straight 7mm Id pipe 9 inches long with a 6mm restriction in the middle, then what happens if we add bends etc into the range of factors.

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PostPosted: Sat Sep 15, 2018 10:22 pm 
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i can give it a try ,and see how good it gets i suppose . it may never be great , but hey it looks good lol ,any other solutions while retaining the copper pipes avidly awaited :)

Actually i just had a thought , i wonder what the effect would be of a 15mm pipe running along horizontally under the mixers, connecting all 6 together,like a balalnce pipe on an old twin su manifold ..


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PostPosted: Sun Sep 16, 2018 8:15 pm 
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Definitely looks good and will be great if can get it working OK with Medusa on board.
Medusa in more than one way - I'd love to see boy racer faces turn to stone as you pull up alongside them with that engine lol. Worth persevering with to keep Medusa for sure.

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