I,ve just got my hands on an Avonbar 1 3/4 manifold , it is for a HIF44 but I assume a HS6 would bolt on the same, if it is for a HIF44 and if a HS6 fits I assume it will sit a little lower as the angle would suit a HIF44 so it clears the bonnet.



I have seen some flow rates for the Avonbar 1 3/4 manifold but they vary quite a bit , 104cfm to 119cfm , has anyone got a better idea ?

The HS6 will start with something leaner than a KP fixed needle , maybe a bit leaner than a BBZ . The 1275 auto will stay standard to start with , then I will move on to a head clean/ rebuild , Wade 240 cam with Isky lifters , one or two other bits and pieces

One thing I am keen to to find is a standard air box for a HS6 , rather than use a K&N cone filter I,d like to keep the engine bay fairly original which would include painting the Avonbar manifold black

.

_________________

From memory you can only fit the standard air box to the HIF44, not to an HS6 as the bolt pattern for the filter/air horn is different, and air horns to suit the Mini filter are only available for the HIF44, not the HS6.

I,ll find out once I get more into it

I just used Simons SU needle chart and the RH fixed needle is a better needle than the BBZ recommended
.

_________________

can you post a few more pics up on the manifold? i just got the minispares HIF44/HIF6 manifold and it looks identical to your one, I have put it with a HIF6 on a pretty much stock 1275 and its running pretty well, bit rich but still sorting needles out, I will confirm what needle i am running and come back to you.
as for the CFM i have no idea.

Grant

_________________


100% Pure A Series Turbo
Morris - The Original RedBull Racing

When I say I got my hands on, well not actually its being delivered so can't get you a better picture, as far as I know the difference between the MiniSpares and Avonbar is the the height of the dash pot screw/plug once fitted, the Avonbar is supposed to be lower to clear the bonnet with a HIF44 fitted
.

_________________

I've used both in the past, and don't remember a height issue with either. Seems to be the type of thing I'd remember!

No, there is no real height issue, its more how close to the firewall is the jet of the HS6 if its sits lower on a manifold for a HIF44, if you get what I mean

The RH fixed needle I mentioned is a lean needle for a Triumph Spitfire running twin HS6,s when compared on Simons chart to the recommended BBZ needle for a 1275 Mini the RH fixed needle is better
.

_________________

I just plotted it against an OA6 (which seems to always work well in an HS6/1275 combo)- it's the same gradient but a little richer than the OA6.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

OA6 ? I,ll add that to the list , is that a fixed needle ?

Have you seen any flow rates for the Avonbar manifold ?
.

_________________

OA6 is what GR fits 1st up on dyno runs and 9/10 times it's perfect. It's a Healey 3000 needle I think and yes, it's fixed.
Nope not seen the Avonbar one but my new Minispares one looks same as your pic.
BTW I'm putting a 20mm thick alloy spacer on it, then I'll blend the spacer into the manifold entry for better flow.
I'll flow test it when finished.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

You'll be finished before I am thats for sure !

20mm alloy spacer ? I,ll put that on the list as well
.

_________________

I've made the spacer 25mm thick, I'll machine it thinner if I have to (filter is only a Ramflo/Unifilter foam).

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

The standard air filter assembly might fit with a 20 mm spacer, but not much else will, I think. I've got a K&N cone filter on my 998 with a minipsport inlet which looks like yours. I originally left the spacer on, but I had to remove the sound insulation to fit it, and the original spacer is only 1/2" I think. Without the spacer it's still pretty tight.

Well, I now have the Avonbar 1 3/4 manifold , its very light , the casting is a bit rough but not as rough as some MiniSport manifolds I,ve seen , the seams will need a light sand , I really can't complain too much it only cost 22 pounds , I havn't got the motor in an engine bay to test the clearance for the jet/ needle to the firewall by the look of the angle it will be close, the photos are a mock up with the HS6 ( yes , it does need a clean and rebuild ), the manifold I might paint with KBS RustSeal in Grey

_________________

Looks much the same as my Minispares manifold.
Here it is with the 20mm spacer. I got it in there with it 25mm, but the jet was too close to the firewall, = no choke.
Working fine now 20mm thick.
Needle is an OA6, with yellow spring.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.