Alan Dean gauzes

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ScimitarMatt
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How do I fit Alan Deans gauzes to my 38DGAS?

Post by ScimitarMatt » Sat Nov 28, 2009 7:32 pm

Afternoon all,

as the great man is sadly no longer with us, does anyone have an idiots guide to fitting Alans gauzes as I'm rebuilding my newly painted essex engine for my coupe and can't remember how you fit the gauzes so they are secure and don't cause air leaks.

Memory says that you clamp the lip on them between carb and insulation block (?) and need to cut some off the gasket to make up for the gauze flange

Also, what sealant do I require?

basically, if anyone can talk me through it in text form, I'd be most grateful

cheers, Matt


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Post by scimjim » Sat Nov 28, 2009 7:39 pm

yes you clamp them between the insulation block and carb. I didn't remove any of the gasket, the metal just digs in - I used a smear of hylomar though.


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Post by Gemini Bob » Sat Nov 28, 2009 8:10 pm

Hi Matt I will be checking mine shortly to see if it has any fitted and if not would like to fit my own so if you can post some pictures of how you get on, it would be greatly appreciated and rememebr I'm a numpty so it would have to be an idiots guide :wink:


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Post by totty » Sat Nov 28, 2009 8:53 pm

As long as the carb base to spacer and spacer to manifold still seals it doesn't much matter. I used 2 gaskets with 1 trimmed around the gauzes and a fuel resistant silicone type sealant. The gauzes shouldn't touch the bottom of the manifold and the bottom edges should be folded back to prevent fraying.



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Post by kennatt » Sun Nov 29, 2009 11:04 am

have read all the bits in slice about these qauzes, do they give a worthwhile improvement,considering fitting some to my gtc.



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Post by ScimitarMatt » Sun Nov 29, 2009 8:41 pm

Well, I fitted them today, time will tell if I did it right :lol:

As requested, a few photos to show the stages of fitting

Image

Image

Image

Image

Image

Image


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Post by Gemini Bob » Sun Nov 29, 2009 8:50 pm

Thanks for the pictures Matt. I always thought that the gauzes were flat disc shaped and just fitted over the holes, I didnt realise they were sort of conical shaped. Are these genuine Alan Dean gauzes?


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Post by ScimitarMatt » Sun Nov 29, 2009 8:56 pm

They are genuine Alan Dean gauzes Bob, years ago, someone on the yahoo forum did drawing of them (I think) so they could be easily reproduced.

They are fine stainless mesh, rolled into a tube the same size as the hole in the base of the carb, the top end it folded over and cut to form a flange, the bottom edge is folded over to form a hem and hold it together.

The bottom round edge is then crimped so it forms a cross shape and closes off the end of the tube a bit.

I should really have photographed the gauzes before they were fitted but I'm sure someone can help out if they've got some unfitted ones

best of luck, Matt


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Post by Gemini Bob » Sun Nov 29, 2009 9:01 pm

If anyone has any to show what they look like before fitting I would appreciate it. Did you use just the one gasket Matt?


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Post by ScimitarMatt » Sun Nov 29, 2009 9:05 pm

The order from base up is as follows:

Aluminium inlet manifold
petrol resistant gasket sealer
thin gasket (paper type)
petrol resistant gasket sealer
Bakelite type spacer block
petrol resistant gasket sealer
thin gasket (paper type) with enlarged holes to accommodate gauze flange
Gauzes
petrol resistant gasket sealer
Carburetor

hope this helps, cheers, Matt
Last edited by ScimitarMatt on Sun Nov 29, 2009 9:54 pm, edited 1 time in total.


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Coco La Blanc

Post by Coco La Blanc » Sun Nov 29, 2009 9:48 pm

Matt,
Nice job and very nice (new ?) Carb ! There is just one difference of choice I made in the order of fitting, following many discussions with Alan D, I fitted the Gauzes after and on top of both the Bakolite spacer and the next Gasket, this followed by a duplicate gasket to create a sandwich effect to seal and hold the Gauzes.
In doing this the petrol has more chance to be vapourised due to the gauze being slightly higher off the surface of the Inlet Manifold and still being in the full flow of the incoming volume of air.
I have seen a big improvement on long trips (2-4mpg) with regard to economy and useable power in both my 5a and Tina's 6a.
Regards,
Viv



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Post by ScimitarMatt » Sun Nov 29, 2009 9:56 pm

Thats how I was planning on doing mine Viv but I had no spare second gasket. Sods law was that after I'd finished, I remembered my pack of emergency gaskets that I keep in my toolbox and in there was a spare carb gasket

(and well spotted too, it is a shiny new 38DGAS from Fast Road Carbs, lovely :lol: )

I might feel brave and put the extra gasket in before I refit the engine

cheers, Matt


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Post by demonbluedays » Sun Nov 29, 2009 9:58 pm

i want to get some unneeded/replicas of these, after a good natter with viv about them , an extra boost to MPG, for me especially as a student would do wonders for my economy! :D


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Post by Roger Pennington » Sun Nov 29, 2009 10:40 pm

Here is the diagram that Matt mentioned (from the hand of Alan, the master, himself):
Image

Viv, I'm a little confused by your description - it only seems to be one gasket thickness different from Matt's and I can't really see that making a significant difference to the height of the gauze? :?

cheers,

....Roger


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Coco La Blanc

Post by Coco La Blanc » Sun Nov 29, 2009 11:28 pm

Roger,
As I said, it was after numerous discussions with Alan that I fitted the Gauzes above the spacer and not directly onto the Inlet manifold for the reasons previously stated.
Regards,
Viv



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