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Water heating a Redline 3005 Weber manifold
https://www.ausmini.com/forums/viewtopic.php?f=2&t=86238		 Page 1 of 2
Author:  drmini in aust [ Sat Jun 28, 2014 2:01 pm ]
Post subject:  Water heating a Redline 3005 Weber manifold
My car with a 45 Dellorto often suffers carb icing on the freeway at speeds around 110KMH.
This makes the carb's butterflies stick at idle when you slow down, and if pronounced, can affect progression, from idle all the way to 1/4 throttle.
[It doesn't happen if I keep the speed to 100KMH max].

So, I have built a water heating pipe, the hot water from the fresh air heater will be piped through it.

It comprises a machined alloy tube 14.3mm OD x 8.5mm ID x 170mm long, threaded on end to suit a shortened 1/4" BSP brass elbow.
It is doglegged upwards to miss the throttle linkage. I will MIG weld it onto the manifold.

It's not welded on yet, but here are some pics-

Image

Image

I hope to fit it during the week.
Author:  mickmini [ Sat Jun 28, 2014 9:26 pm ]
Post subject:  Re: Water heating a Redline 3005 Weber manifold
nice work
Author:  Mick [ Sat Jun 28, 2014 10:33 pm ]
Post subject:  Re: Water heating a Redline 3005 Weber manifold
We used to watercool small air cooled aero engines by wrapping copper tube around the head a couple of times to wick away the heat.

Would this work in reverse around the manifold runners? Maybe in 1/2 " tube?
Author:  drmini in aust [ Sat Jun 28, 2014 11:12 pm ]
Post subject:  Re: Water heating a Redline 3005 Weber manifold
Mick, I thought of winding some copper tube instead, but there is little room there.
And where it needs the warmth is at the manifold's carby flange.
This way, I can weld the flange to the alloy tube on both sides (after I screw the 2 top studs out).
Author:  Mick [ Sat Jun 28, 2014 11:13 pm ]
Post subject:  Re: Water heating a Redline 3005 Weber manifold
How's the heat transferred Kev? Just through the contact points on each runner?
Author:  drmini in aust [ Sat Jun 28, 2014 11:19 pm ]
Post subject:  Re: Water heating a Redline 3005 Weber manifold
I will lightly file the top of each runner so the tube has pretty good contact, then MIG weld it to the flange, the 2 vacuum bosses, and around each side of each runner. Should be plenty of contact for heat transfer. It's all alloy....
Author:  Morris 1100 [ Sun Jun 29, 2014 10:53 am ]
Post subject:  Re: Water heating a Redline 3005 Weber manifold
I bet it still freezes. :mrgreen:
Author:  drmini in aust [ Sun Jun 29, 2014 11:02 am ]
Post subject:  Re: Water heating a Redline 3005 Weber manifold
Morris 1100 wrote:
I bet it still freezes. :mrgreen:


It doesn't ice up it all the time. Alfas with twin Webers or Dellortos don't ice up, and their carbs are mounted on rubber. They do get warm air in the engine bay though, from their front mounted radiator.

If this doesn't work, plan B is a clip-in Mini airbox to draw air from above the headers and duct it up to the filter. Only fitted for freeway running. :wink:
Author:  Morris 1100 [ Sun Jun 29, 2014 11:24 am ]
Post subject:  Re: Water heating a Redline 3005 Weber manifold
A front mounted radiator would cure it. :lol:

But a heated manifold will defrost it quicker after the motor cuts out.
Author:  drmini in aust [ Sun Jun 29, 2014 12:26 pm ]
Post subject:  Re: Water heating a Redline 3005 Weber manifold
It's not ever that bad that it cuts out.
The other day going North after cruising @ 110 kliks I came off the M5 onto Camden Valley way, and only noticed when I stopped at the lights that the throttle pedal was tighter to move at idle. This symptom went away by the time I got to Victoria St, near Cumberland Hwy.
So I don't think a lot of heat is required.

On the track I never had this problem, because you are up it all the time, not cruising fast at light throttle. :lol:

[edit] I would have welded it up today, but the wind was blowing a gale through my garage. Roller door each end doesn't stop it.
Author:  drmini in aust [ Mon Jun 30, 2014 3:24 pm ]
Post subject:  Re: Water heating a Redline 3005 Weber manifold
Welded and hooked up.
It warms the manifold up nice, we'll go for a lap on the M4 tomorrow and see if it solves the problem.

Image

Image
Author:  Morris 1100 [ Mon Jun 30, 2014 6:11 pm ]
Post subject:  Re: Water heating a Redline 3005 Weber manifold
The M4 usually isn't too bad, you might get it near South Creek (near Mamre road) if it is a little foggy.
I used to get it on the Northern Road quite a bit.
Author:  drmini in aust [ Mon Jun 30, 2014 6:52 pm ]
Post subject:  Re: Water heating a Redline 3005 Weber manifold
Last time I got it bad was just before Northern Rd as I slowed down on the M4. It was 11am too... not cold.
I don't get it on Northern Rd, as I'm abiding by the 80kmh limit, +/- a little. :wink:
Author:  1310/71 [ Mon Jun 30, 2014 8:07 pm ]
Post subject:  Re: Water heating a Redline 3005 Weber manifold
I once had it in my Brock commodore half way up river lett hill towing the sports sedan to Bathurst early one morning - that was interesting. Stopped on one of those blind corners and had to roll it back around the corner to get another run up once I got it going again - on my own of course.
Author:  drmini in aust [ Tue Jul 01, 2014 10:48 am ]
Post subject:  Re: Water heating a Redline 3005 Weber manifold
I just took it for a registrar approved `maintenance run' up the M4 to Northern Rd and back. Sat on 110-112KMH (GPS) where posted.
No carb icing yet, and since water heating the manifold it is smoother at low speed in traffic too. :D

[edit]
I am going to replace the carb's 4 steel mounting bolts with brass ones, for better heat transfer into the carb body.
These carb bolts don't need to be really tight.
I use a stock Dellorto flange gasket, not one of those damned soft mount things. Had no problems in 20 years running. :wink:
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