S1 & 420G similarity

[mgcjag]

Hi Jeremy...anti skid washer?....never seen one before. ...just googled and only mention is for tapered spring on Burlan site but thats a plain looking washer ..Steve

[Jeremy66]

Burlen don’t list or make them but they were in some HD8’s

[mgcjag]

Not in E types though?.....Steve

[Jeremy66]

[PeterCrespin]

Got the tap but it needs a bigger than average tap handle. I have one, but ended up chucking the dashpot in the lathe and aligning the tap by using a dead centre in the tailstock and turning the tap with an open-ender. Did you shorten the dampers or replace them?

[mgcjag]

Hi Jeremy..thanks for posting diagram showing skid washer....had a look and its shown in the Jag service manual and in the parts catalogue S1&S2 in the knowledge base.....iv had quite a few HD8s apart and rebuilt but have never see one before......theres always something to learn with an E type...cheers.....Steve

[AussiE]

Wow, learning quite a lot here!
Has anyone tried keeping the mk10 carbs as is, complete with starting carb and just changing the manifold and adapting a cable throttle? From what I can see, the 2 10mm pipes are for water (to gauge temperature) - could they be fed from a tee piece at the back of the manifold?
I had a look at a friends e type and there seems to be approx 35mm of clearance to the bonnet, and the dash pots are only 10mm shorter. So if I were to keep the mk10 dashpots that would still leave 25mm clearance.
Thanks again!

[christopher storey]

Steve : I don't think that this washer is in fact an authentic part. I see that this diagram is in fact from Terry's which is some American aftermarket spares outfit . If it's not in the Burlen list, then in my book it's not authentic !

[mgcjag]

Hi Christopher...its shown in the green Jaguar Service manual on the carb diagram...and its in the parts catalogue here in the knowledge base section for S1 & S2 cars....Steve

[Robsan]

Aussie,

Regard using complete carb set up from Mk10 or 420g.................... I am not the expert here, but doesnt the non e type manifold raise the carbs too high so interferance with e type bonnet ?

[mgcjag]

Hi Robsan..from post 27....the question was keeping the mk10 carbs and changing the manifold (for a E type one)...Steve

[PeterCrespin]

From what I can see, the 2 10mm pipes are for water (to gauge temperature) - could they be fed from a tee piece at the back of the manifold?

The small starting carb is electrically controlled by an Otter switch at the top front of the manifold. It is basically a fuel/air solenoid held open by the switch that is closed when cold (i.e. the opposite of the E-type fan switch).

While in operation it makes a hissing sound as manifold vacuum sucks air through it and mixes it with fuel from the adjacent carb float bowl. The air/fuel mixture then passes along the pipe and tee piece into the air rail at the two points blanked off in an E manifold. If you adjusted the tubing to fit the E 4.2,manifold, and fitted a thermal switch, I’m sure it would work and the same twin mixture pipes would supply the six paired ports. You would save a a lot because the HD8 manual choke bits are expensive.

[AussiE]

Ok, I think that is the path I will explore.
The 4.2 runs superbly and the starter carb works well so that leaves me with only the cost of the E manifold and some minor fettling.
Will be interesting to see if the 10mm higher dashpots have enough clearance, I think I will just have to wait and see.
You’ve been a big help everyone!
Will post an update when it’s running!

[MdR]

Hi, a late reaction; but is this skid washer a crucial part of the carberator? In order to fine tune the 3 HD8's of a 4.2 engine?

[PeterCrespin]

Not essential really..It’s a simple brass stamping to keep the base of the big soggy spring concentric with the damper tube. I assume it prevents the base of the spring skidding sideways and the spring becoming fractionally less linear if it skews and rubs the casting, but most carbs either no longer have it or never did. I have one original part if someone wants to 3D print a few?

[Geoff Allam]

I have three that came with a mark ten set of carbs. Looking at them it looks to me like they lift up the springs about 1/4 inch which would create more spring tension and make the mixture slightly richer once the carb was off idle?