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Merry Christmas!! Question: do you think replacing new dashpot dampers (LZX1505) will make any difference on HIF44? Those dampers are there since 1991.

That little MG looked fabulous especially under the bonnet.

Hi there The turbo style oil pumps have no oil hole for the rear cam bearing - do you recommend giving it one in the same place as a standard pump?

after watching this I realised I knew nothing about how the su carby really worked and how sensitive it was. One question I have why are some needles screwed in and flexible and some are hard fixed? I set up my triples with the jets set like you showed in a previous video on a motor like you said to do which will just get it started. However when I started the motor with the butterflies closed it strangely revved up high. I can't work it out any ideas?

very knowledgeable love the topics

Time warp cars. The MG Metro is spot on 👌🏼

Nice work And a very Merry Christmas 😊

Merry Christmas AC! Looking forward for the next tuning season👍

A very merry Christmas to you AC. Thanks for keeping us all informed and entertained. Bring on a new year and a new season of OTRT

Merry Christmas AC! Will be keen to get in touch next year once my car is back on the road!

Think im set on a 123 tune dizzy now. Seems like a worthwhile investment especially coupled with a decent Wideband gauge.

Marry Christmas AC and to all your subscribers

Incredible Metro! Far better than new

Great video, AC, and so pleased to see a couple of familiar faces (Connor and Matt) benefitting from your skill, knowledge and attention. Fabulous!! Happy Christmas Adrian and thanks again for your wonderful work on my Metro this year. Cheers Steve

Merry Christmas AC. That was a cracker to finish the year. The cut aways where you fill us in with more details are great. See you next year.

Excellent! I was just about to watch your video on Dizzys, but you've done a Christmas special!! What a treat! Cheers

Is the LZX1511 dashpot damper correct for the MG Metro? I thought they had the LZX2085 as standard, or were those only fitted to the 1990-92 1275cc Mini Coopers?

Two beautiful looking cars .. Wow, that Metro engine bay ...❤

When you mention different positions of needle for different RPM, i assume you mean different airflows as for example a large throttle angle at 4k may be the same airflow as a smaller angle at 6k but both will raise the damper the same amount as its airflow lifting it versus the spring? And hence you can only pick one AFR for both of those situations even though in reality it might be better to be a little richer at WOT at 4k than at 2/3rd throttle at 6k as one is acceleration and the other is maintaining a constant speed on fast cruise?

I find it useful to continue watching your videos, because it's amazing how quickly I forget stuff when I don't do it all the time 🙂 🌲Happy Christmas 🌲

Merry Christmas AC Dodd, hope to catch a chance for you to tune my mini next year

Merry Christmas Mr Dodd.

I'm having a bear of a time tuning an MG 1100 engine in my Mini. I have no idea what damper spring I have in the carb as there is no paint on it. Can anyone tell me what the wire diameter and number of coils per centimeter or inch of the various damper springs are? With that information I could measure what I have a go from there.

Hello, I know this video is a few years old but thank you so much, this really has given me much to think about and how to really seat valves correctly with precise leakage testing and showing the differences in the grit of the paste is a huge deal. I hear and have read about the 360 and up but I know it needs to be much higher, and how do you determine the mix ratio or do you have a site which can provide more information or a more in-depth look into getting the paste just right? Thanks again

Six thousand not six tenths

12:24 - wonder how these look after a little carbon build up?

Looks like some yanks have found your video now and want to start arguments. They don't get what you're trying to display and never will, they don't want to.

What fuel stabiliser do you suggest.

The more you watch the more you understand that little SU is a much more complex and clever bit of kit than first thought……..and the hours you must have spent fettling and playing with them over the years is probably immeasurable lol. Looking forward to the next part, if not before the new year Merry Christmas AC 👍🏻

B*llox I missed this.

More Qs from me AC! Q1: I've a 2.5 Land rover and it seems to like a green spring. Big engine, but it's v.slow. Still only 85bhp tops. Is a heavy green spring a given? Q2: How do you know difference twixt weakening on demand 'cos spring is too light vs oil too light?

Thanks AC. Good as ever Subcribed. In my application, swapping from an HS6 with level float-bowl to HIF44, where you can't level the float-chamber, carb is to be tilted at 25-30 degress. Do we have to worry re: float height?

Thanks AC. Love your stuff, no 'kin waffle - proper info. Guessing that explains why (0.100 needles anyway) all seem broadly the same at needle's thicker end, stations 1-4.

Great video. Very informative, thanks AC. Its making me nervous starting my rebuild up. I have a wideband gauge fitted though.

Great explanation, really enjoyed that thank you. Quick question, how accurate is the jet sizing with relation to production? Does this need to be considered with relation to needle adjustment?

Brilliant explanation A.C, Very informative as always.. Thank you 👍

Hi AC. Greetings from Germany. I Tried to follow up your Explantations but because of my english i missed the Point where you mentioned what the figures on the left machine means. Is ist the CO ? Because i have an Innocenti with 2x HS2 carbs i would like to check and see how it is working on different rpm. Greetings Markus

Excellent video! What I was looking for. My defender V8 runs rough and fuel odor is very strong. 4 out of 8 spark plugs are completely black. Conclusion is one of two carbs has issues. What kind of carb service you suggest to do?

Two questions,if I may. You drew the graph with nominal lines for bore wash and misfire zone. What actual figures do you place on those lines? Secondly, do you check the fuelling under load, rather than free revving? I dabbled with SU carbs for some years, and replaced a Weber 34ICH with an ISO 38mm (SU clone, better engineered in my opinion) and after a short time realised that the jet was .095”, rather than .090” or .100” so none of the SU needles were of any use and engine ran very weak once off idle. I then realised I had to fine tune my own needle. After I’d got it running as well as I could I took the car to a professional, who tunes many classic cars for racing as well as road use, for rolling road work. After a couple of runs he laughed and took the plugs out to show me the colour. He said there was nothing much he could do to improve the mixture because I’d got it spot on across the full range. He did manage to get a little more power by adjusting the timing. He jokingly asked me if I wanted a job and we became good friends. I’ve since moved on to fuel injection and built my own fuel injection system. Rather than modifying needles and distributors I now enjoy tuning with my laptop. All fascinating stuff. I still used my Colortune transparent spark plug to get the car running well enough to begin with and my Gunsons Gastester to further improve it before I began actual road work.

Brilliant... Thanks AC!

thanks AC. I am beginning to get a grasp on the complexities of SU tuning (HS4s on a '67 BGT here). How about a recording wide band gauge that could plot lambda against throttle position as you drove the car through a range of engine speeds and loads. Could analysis tell you whether you should change or modify the needle ? John in Manitoba, a long way from you.

very very clear, thanxxxxxxxx

...Do I now have a claim to fame as I was sat opposite Don at Burlen when he wrote the advice section 'Choosing a different needle' for the Profile Chart?. Unlike me , he's a very clever chap!. 🙂

Brilliant explanation, thanks. How challenging is it with twin carbs to modify the needles by the same amount?

S U perb.......thanks for that 😎

Excellent......missed it live though. Looking forward to your videos next year. 👍

For those that are interested in a sensible set of micrometers, I mentioned Chronos in the chat here is a link; www.chronos.ltd.uk/product/dasqua-set-of-3-micrometers-0-3-0-0001/

Definitely flawed Ecoboost design - rubber belt in oil - crazy! Wife had a 2009 Ford Fiesta 1.4 diesel and it is still going strong.

Great will watch later though

Thanks AC. Like others in the comments - I had a ballast for 1980s Transit cold-starts, er nope!