Stone56
Well-Known Member
- Posts
- 4,866
- Location
- Up a mountain
But good in the wind
I would just like to say
- Thread starter Hippo
- Start date
This site contains affiliate links for which LandyZone may be compensated if you make a purchase.
Stone56
Well-Known Member
- Posts
- 4,866
- Location
- Up a mountain
Need to translate that for me would get the cane for writing like that in my school days
- Posts
- 48,253
- Location
- East Dorset
So flipping hot here, stepping out of the house is like stepping into a sauna, and that is stepping into the shade.
- Posts
- 48,253
- Location
- East Dorset
Did you know? Marrying a dead person is possible in France
Posthumous marriage is permitted in a unique legal arrangement
The link, if you can open it shows an amazing right that French peeps have that no other country allows!
and this is the wind that blows in our area.
Vent d’autan: the French weather phenomenon said to drive people mad
Superstition says that the wind, which affects the south-west of the country, turns the locals 'crazy'
The details of its effects and supposed cures are also interesting!
- Posts
- 17,950
- Location
- Benfleet, Essex
I had noticed that the pre-ignition "bang" seemed to always occur when trying to accelerate from a low (15-20) speed. I know generally how the SU carb works and I realised that if the throttle was suddenly opened that the dashpot would rise and that if it rose too fast then the "accelerator pump" effect could be lost. So that was the prompt for the 20w/30w change.I must admit that if it had been me I would maybe have done both of these but I would have done them one at a time to see which had the effect.
Predetonation I would have imagined coming from the timing being slightly too advanced, yet you have advanced the timing but you have done that and it has gone away.
It also used to happen when cars first started using lead-free petrol, to the point that a backfire exploded W's BX's front box!
So I retarded it by much more than was originally thought it ought to be. (Later figures given out showed the earlier ones to have been too conservative.) So what fuel are you using?
Changing the dashpot oil would affect it on acceleration and if that is when it used to happen then you would be momentarily making the mix richer than before which I think would also stop it preigniting, but I am not sure on this.
Have you tried the old skool way of measuring the power of your engine under road conditions?
i.e. getting someone to time with a stop watch how long it takes to accelerate from one speed to another while remaining in top gear??
This used to be in all the old skool Haynes Manuals. And not changing gear makes that not a factor. Say from 30 mph to 60?
Done a few times, either on the flat or up a hill, if you can, starting always from the same point?
I do not know if the head on this 1275 is leaded/unleaded head but I always fill up with "Super" E5 and add a fuel additive "Castrol Valvemaster".
That tip on looking at your plugs and getting the soot line on the earth strap to begin close to the plug's threaded section was a secondary change. It does not seem to have done any harm. The dizzy was NOT moved by the "tuner" so he didn't mess with it at all, he just wound the jet down and filed the needle. I am feeling pretty comfortable with how the thing is running right now so I may cancel my static tuning session with that bloke you don't think much to.
Last edited:
- Posts
- 7,347
- Location
- uk
Should be strong enough to withstand the wind on the inside of the tent after a night on the beer and curry -----.But good in the wind
Just a thought, the jet in an SU isn't adjustable
All the jets are the same size and fixed in HIF 38 carb for instance, just have different needles for different cars
- Posts
- 17,950
- Location
- Benfleet, Essex
Yes I know. If you wind the jet DOWN the mixture is enriched across the entire needle profile as the needle moves up and down.
Contouring the needle at the relevant "stations" affects the mixture at the station-specific rev-range.
The needle he "made" for the car was a terrible HACK that would have eventually sawn through the jet and buggered that too.
I took his "custom" needle out and put a BDL back in and re-tuned it myself as per the SU setup manual.
Here's a pic of the hacked about needle he made. Se the big notch in it? there's one on the other side of the needle at the other end too and inbetween it is all rough as a bear's bum file marks. Look at the smooth fine end of the needle that he did not mess with compared to the part that he "customised"!
- Posts
- 17,950
- Location
- Benfleet, Essex
@Stanleysteamer well, well, well. Here is our SU carb "expert tuner" showing us all a perfect plug after a tuning session.
Just like the guy in the YT clip advised look at the fire mark/band on the earth strap of the plug. 100thou' band just above the thread of the plug.
Just like the guy in the YT clip advised look at the fire mark/band on the earth strap of the plug. 100thou' band just above the thread of the plug.
GRATCH
HUGE MEMBER
- Posts
- 15,966
- Location
- North Cheshire
Perhaps you should have it amputated?
Ha, Ha!
And the silly feck can't even spell whisky properly!!!!!
Jet doesn't moveYes I know. If you wind the jet DOWN the mixture is enriched across the entire needle profile as the needle moves up and down.
Contouring the needle at the relevant "stations" affects the mixture at the station-specific rev-range.
The needle he "made" for the car was a terrible HACK that would have eventually sawn through the jet and buggered that too.
I took his "custom" needle out and put a BDL back in and re-tuned it myself as per the SU setup manual.
Here's a pic of the hacked about needle he made. Se the big notch in it? there's one on the other side of the needle at the other end too and inbetween it is all rough as a bear's bum file marks. Look at the smooth fine end of the needle that he did not mess with compared to the part that he "customised"!
View attachment 347134
Needle goes up and down as you say
Have you tried no oil in the dashpot just to se if its the same ?
Sorry, jet goes down if you inscrew it, I'm in the pub
- Posts
- 24,539
- Location
- In the next Glen
- Posts
- 13,959
- Location
- Far out West
- Posts
- 24,539
- Location
- In the next Glen
I think they do ‘extras’
Yer its an all men only club with bob giving the extras, he'll give you a BOB A JOB
Hippo
Lord Hippo
- Posts
- 55,746
Web site bocked cos eye is only 6 and 2 arfs.Oh aye the place were you get a happy ending
- Posts
- 24,539
- Location
- In the next Glen
Been oot to put the centre console n bits back on, drives far better, fault in the ns indicator & a led drl out.
Got new leds here but they are a wee bit smaller & dont quite fit in the bumper hole like the others.
Got new leds here but they are a wee bit smaller & dont quite fit in the bumper hole like the others.
- Posts
- 24,539
- Location
- In the next Glen
7 then ??
- Posts
- 17,950
- Location
- Benfleet, Essex
I know the jet does not move, the jet should only be used to set the idle mixture only. But if you go hog-wild and wind it down too far you affect more than just the idle mixture, you affect the first few station positions too.
GRATCH
HUGE MEMBER
- Posts
- 15,966
- Location
- North Cheshire
Shoe size?
Similar threads
