Classic cars forum & vehicle restoration.

[Ray White]

[ukdave2002]

Anything fitted to a modern would have to be quiet:

https://tinyurl.com/47pm5rm8

[Ray White]

This afternoon I had another look at my vacuum pump. Before going to the trouble and expense of buying and fitting a quieter vane type pump; making fitting brackets etc., I had an idea that may just work.

Looking at the small air filter attached to the exhaust that is supposed to lessen the noise - and doesn't - it occurred to me that I could attach a pipe in it's place and route it down under the car.

Surely that would be an improvement.?

At the moment, I can't think of any drawbacks...

[Ray White]

Today I re fitted the supply wire. I then removed the little air filter from the vacuum pump exhaust and replaced it with a 2ft length of reinforced rubber hose; fitting the air filter on the end just for good measure. With the hose routed down below the axle I reinstate the insulated cover and carpet...then switched on the ignition.

There is still a fair amount of noise coming from the pump but it is now muffled ...so I will keep things as they are for now.

Meanwhile, the engine is running better now and my carb trumpet ram has been dispatched.

.

[Ray White]

Today I fitted the ram trumpet and it seems to be working better than it needs to. By that I mean the extra air seems to be making the mixture too weak. It backfired through the blow off valve so more adjustment is needed.

The other problem now is the brakes have stopped working. It is probably just an air lock as the remote reservoir still has brake fluid.

[JC T ONE]

Not easy with all that extra power, and no brakes
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http://www.eurods.eu/wp/index.html

[Ray White]

[Ray White]

The intake trumpet has a rather coarse gauze which in terms of filtration is about as much use as a cat flap in a submarine.

On the other hand, the lovely K&N filter is causing too much of a restriction and enriching the mixture beyond control.



I thought perhaps I could find middle ground by making my own gauze filter from this.!!....


With a little fettling and gasket making this is what I have contrived...
.

[alastairq]

Looks good. Old fashioned tea strainers are useful...

SU's need [like many other types of carb] a 'stand-off' area in front of the intake.
Haircooled VWs have the same issue with their single carbs.....folks shoved posh pancake filters on top, and had a reet issue with fuelling as a result.
A good inch or two from the face of the carb was, I think, the recommended stand-off distance?

On my Dellow I use [what it came with] some dome shaped filters, which are open...[I found those foam filters sold for Harley Davidsons to be the cheapest replacement foam filters]...all the way around, with nothing solid on the outer sides.
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Dellow Mk2, 1951 built, reg 1952.
Fiat 126 BIS
Cannon special [1996 registered. Built in 1950's]
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Ford Pop chassis, Ashley 1172 bodyshell, in pieces.

[Ray White]

Thank you Alastair. I thought about one of those "sock" filters over the trumpet but decided against purely for aesthetic reasons. I am also not sure how much difference they would make over the K&N. There is practically no resistance with my tea strainer fix but hopefully enough of a barrier to stop harmful bits getting into the supercharger.

Every new idea with this car is up for grabs so I am just experimenting at the moment. Fortunately, I didn't pay much for the K&N filter.

One thing that has alarmed me, however, is the amount of air I am getting out of the brakes. I can find no leaks so hopefully it is just because the system is new and untried. I suppose air locks are to be expected; only time will tell.
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As of this afternoon I am pleased to report that I have a good brake pedal!!!

The trumpet (with additional filtering ) is installed on the carb and apart from some fine tuning is ready to go.

[The only thing that is now stopping me from going for a test drive is the weather. Being a nice warm sunny afternoon, "her indoors" is "outdoors" and I am under strict instructions not to start the car up while she is sitting in the garden. She can smell the exhaust fumes and it gives her a sore throat.

I then get it in the neck and questioned why I am "playing with that car" when I should be mowing the lawn!]

[Ray White]

This evening I started the engine but I seem to be back to square one with the smokey exhaust.

I am now thinking I have an mis fire. I had previously checked the plugs and they were all sparking out of the engine O.K.. The compressions are all equal at a respectable 105psi. The timing is electronic and set at the recommended No8. (out of 12 settings)

I can try a different set of plugs.. If that doesn't work I could replace the electronic distributor with the original manual one with a new set of points and condenser. The only thing that concerns me about doing that is I have no timing marks.

[bjacko]

What colour is the smoke? I think it is black for petrol and grey/white for oil. This may give you a better clue as to cause.
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1938 Morris 8 Ser II Coupe Utility (Pickup)
1985 Rover SD1 VDP

[Ray White]

[Ray White]

This morning I started the engine and removed the leads one by one and managed to identify which cylinder I think is not firing.

The strange thing - to me at least - is that if I just hold the lead on the plug but not push it on, the engine runs sweetly. As soon as I push the lead right on, it starts misfiring again.

If I take the plug out and hold it against the head with the lead fully attached, it sparks O.K.

At the moment I am not sure what Is going on.

[ukdave2002]