219 replies to this topic

[N/A-PWR]

Priceless if you can get them,

 

 have seen some sold with the SU's though, maybe because the seller didn't know their value.

Its handy to know that you can get the made up if needed. What do armours go for on the second hand market?

looks like Mick is right about, High RPM = short runners.

 

 

Edit:-

 

Did read that when you have flat spot problems,

 

 change the manifold length to a shorter one,

 

 and I wonder if we can make up a graph of all these figures, hmm.

Edited by NA-PWR, 20 April 2016 - 05:42 PM.

[N/A-PWR]

here is testing different trumpet lengths:-

 

https://nwmobilemechanicdotcom.wordpress.com/2012/11/28/optimizing-volumetric-efficiency-with-inlet-runner-length-pulse-tuning/

 

found this graph:-

 

 Runner length.jpg   54.78K   5 downloads

https://books.google...pm graph&f=true

 

[warrenm]

I paid $100 for the last set I have, think I might have got the other set for the same sort of money.

[LC-GTR-1969]

I have a set of armours genuine 2" manifolds if you're interested.

 

Are they the early type, or the later type? I have been told that the early type have fitment issues under an LC/LJ? Apparently the later type just sneak in under the bonnet

 

Pm sent.

 

Cheers mate

[N/A-PWR]

Ole mate Craig (wot179),

 

 gave us an 8" Armour in the shoutbox:-

 

 

 20151210_204926 8 Armours.jpg   44.17K   11 downloads

 

I think mine are the earlier style , does anyone have measurements.
They look sort of like warrens pic but not sure.

[SA EH]

Early style, same as mine.
These have no 15 degree kick on the carby end as bomber mentioned earlier.

[N/A-PWR]

Found the other picture showing the two:-

 

 8 inch vs 7 inch SU runners 2.jpg   82.1K   19 downloads

[SA EH]

Can anyone tell me what the difference between a "thermo" and "non thermo" hd8 2" SU carb is?

Buggered if I can find it anywhere....

[I'm a Red Motor fiend]

There is a good detailed description at sucarb.co.uk. Interesting reading....

[jd lj]

Does that have a similar intention to the temperature compensator on 175 cd Strombergs?

[SA EH]

Cheers lads, that's cleared it up a bit.

[warrenm]

Does that have a similar intention to the temperature compensator on 175 cd Strombergs?

It's more like an auto choke. 

[SA EH]

Legends, I'm finally at the point of fitting new throttle shafts & plates to the hd8's after cleaning, chamfering, deburring & smoothing the bodies.

Question is, do they have a brass bush originally to support the throttle shaft that needs drilling out to accept the new style bush?
There's definitely brass in there, doesn't look like a tap out bush though, thinking of drilling it out.....
Any thoughts?

I could post a pic but I can't be stuffed right now

[LC-GTR-1969]

So its only 1 year later, but I am finally close to throwing on my 2 inch HS8s...

 

Ive had a lot of stuff going on in the past 12 months which has slowed things down a lot- but the project was never far from my mind- just time is something I have very little of...

 

Anyways, ive ported my warnerford manifold out to match the HS8s, ive installed .125 jets with UP needles... Cant remember the spring colour- think they were red... they were advised by Midel re springs... 

 

Im just finishing up building the linkage arangement, and I should be installing the carbs in the next few weeks (I have a few days off work coming up over easter, and plan to install the carbs).

 

So, how far should I lower the jet from the bridge as a starting point once the carbs are installed? 

 

Also, I have some float spacers, and was wondering how high the fuel level shoudl sit within the jet tube once they are installed. I will be running 2.5-3psi, as per my webers.

 

Any advice much appreciated!

 

Regards

[SA EH]

When I fitted my UP needles I'm pretty sure I had the jets down about 2.5mm from the bridge. Current needles are down to nearly 3mm.

Not sure about the float spacers though, what's their purpose? I'd just set the level as per SU specs & leave it. If there's any need for float adjustment you can bend the fork under the needle & seat, but any adjustment of the float won't effect where the fuel sits in the jet tube.

[LC-GTR-1969]

When I fitted my UP needles I'm pretty sure I had the jets down about 2.5mm from the bridge. Current needles are down to nearly 3mm.

Not sure about the float spacers though, what's their purpose? I'd just set the level as per SU specs & leave it. If there's any need for float adjustment you can bend the fork under the needle & seat, but any adjustment of the float won't effect where the fuel sits in the jet tube.

 

Cheers mate- just to clarify, they are spacers beneath the needle seat- it in effect changes the height of the float chamber when you add or remove the little washer / spacers... I figured that the higher the float is set- the higher the static fuel level is within the jet tube... This is all just assertions though, ie im only just thinking that if the float level effects the level of fuel within the jet tube, this could be problematic if this level is too high. Just thoughts though, I may be wrong- I was once wrong in the 80s so it could happen again bahahahahaha

[warrenm]

I generally set the jet .065"(1.65mm) down from the bridge as the starting point. I have used those spacers that you refer to, but wasn't able to get the fuel level high enough, so a made some spacers to go between the bowl & the lid.

Set the fuel level about 3mm down the jet. This may be hard depending on the angle on the manifold.

You can see the spacers in this pic.

 DSC00015 PCV (600 x 450).jpg   79.38K   13 downloads

 

[warrenm]

Another method to raise the fuel level is to use Cooper S bowls, they have the mounting lug positioned further down the bowl.