Ebay Score

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Collector Inspector
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Re: Ebay Score

Post by Collector Inspector »

And the Repair?

B
A chicken is one egg's way of becoming others
Gannet
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Re: Ebay Score

Post by Gannet »

Bruce,

I think it is probably quite correct that FV3302 hasn't got the extra web aboye the stub tiller. The early FVs are to that spec. I suspect that high stress values at this point when the stub handle is used as a carrying handle was the reason the web was introduced.
I believe that this extra web was introduced probably sometime between 3481 and 5141. There are some engines prior to 3302 with the web, but there is some evidence that they were rebuilt/repaired. For example my FV2821, which has a tilting tiller and Adrian's FV3364. (Note:-the photo of FV3481 appears to indicate no web - could Garry confirm this.)

Jeremyare
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Re: Ebay Score

Post by Collector Inspector »

Well spotted but you have all missed two things so far.

The repair........not the Tiller.

The missing?

I am still pleased with it regardless.

Post to me is about AU135.00

Thort we had "Eagle Eyes" with pics!

B
A chicken is one egg's way of becoming others
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Re: Ebay Score

Post by AusOB_Collector »

B

Skeg is broken off and missing.

Can you give us a clue to whereabouts the repair is?

Powerhead, gearbox etc...

Repair is the side of the cylinder where the tell tale exits from? Or has someone said that?
The long metal piece.

Cheers
BP
Too many Seagulls to count now!


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Re: Ebay Score

Post by headdownarseup »

Missing the correct tiller,grip and throttle lever.
Cylinder head looks like it's been snapped off or broken around the water outlet area (did i not mention that before?)
Skeg is busted (Boyd spotted that) :oops: eagle eyes not working that well these days sorry! :roll:
Tilt hook assembly (as per my pics)

Prop looks a bit chewed in places (no biggy)

Are we missing something that we can't see in your pics B?

Jon
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Re: Ebay Score

Post by AusOB_Collector »

Jon
Cylinder head looks like it's been snapped off or broken around the water outlet area (did i not mention that before?)
Unfortunately you didn't, I actually thought someone else had because it was so obvious. :shock: :lol:

Merry Christmas from here in Aus.

Cheers
BP
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Gannet
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Re: Ebay Score

Post by Gannet »

Seasonal Greetings to all. Have a great Christmas Day.

Bruce, you were asking about the carb inlet cowl. Well, measuring the inlet diameter on a few earlyish FVs gives:- 3 off at 0.65, 2 off at 0.69 and 1 off at 0.71.
Could somebody explain to me:- 1. Why are the inlet cowls so shaped? 2. Why have a nice inlet trumpet shape and then fit an inlet restriction? 3. What effect on engine performance does changing the inlet dia achieve?

Jeremy
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Charles uk
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Re: Ebay Score

Post by Charles uk »

You'll be surprised at the difference that restrictor makes, has anyone got a one of these trumpets with a missing restrictor that they could lend Jeremy, as he uses one of this series of motor more than anyone else & could probably answer his question within a month.
Do you have a rev counter Jeremy? so you can measure the difference.
Make it idiot proof and someone will make a better idiot.
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Re: Ebay Score

Post by Gannet »

Thanks Charles,
But what is the theory? I do have a broken trumpet which I could use for trials, but I am interested in the thinking behind the design. Will it make much difference to an FV, especially at small throttle openings?
Yes, I do have a rev counter - a nice old fashioned mechanical one.

Jeremy
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Re: Ebay Score

Post by Charles uk »

I should have said a rev counter for use on the boat, I got a 450 rev reduction without the restrictor on an LLS!
Make it idiot proof and someone will make a better idiot.
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Re: Ebay Score

Post by truant »

Hi, Jeremy, Merry Xmas etc, etc, Just reading thru the previous posts, and noticed the reference to the tiller stub web so just grabbed a torch and battled the cobwebs in the shed to check FV 3481, there is no web on the tiller stub at all. Great job on the catalogue of the little engines, thanks for the email.Merry Xmas and a happy new year to all, Best wishes, Garry
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Re: Ebay Score

Post by Gannet »

Charles,
Yes, I am not at all surprised that the restrictor is beneficial in some or possibly even all cases. I was interested in the reasoning behind it.
My rev counter can be used on the boat - just got to be careful not to drop it overboard!

Garry, Seasonal Greetings. Thanks for confirmation about the web. Probably quite reasonable to assume that the web was introduced sometime after 3481. As my 5141 has the web, the introduction probably lies between these two. It would be interesting to know to what spec Peter's FV4163, which resides in New Zealand, has been built to.

Jeremy
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Re: Ebay Score

Post by headdownarseup »

Some of you might remember a while back when i was working on LS35744 i was having a lot of trouble trying to get the thing to run.
As Jeremy will i'm sure point out, most if not all of the "little model 40" series motors (except for the original F) use the smaller 7/16" carb instead of the larger 1/2" type you'd find on most of the later 40 range.
Some things i discovered while messing about with the LS were that straight away by fitting the smaller carb made a massive difference to how easily the engine fired up. When i first acquired the motor it had the larger 1/2" carb which i thought was odd,it ran like a pig, but after several owners these things often happen. Secondly the mixture had to be slightly leaned off from its factory setting to acheive acceptable running. I also noticed that the inlet trumpets had different restriction diameters. Not much of a difference between the 5 trumpets i had to hand, all of them within a 16th of an inch smallest to biggest. Suffice to say that smaller carbs i would think would have a slightly smaller restriction which is how my 3 x LS's are now set up.And probably my FV too. (dont ask me to go outside and double check the diameters as it's chucking it down right now)
I too have noticed that when the trumpet is removed the motor will not rev quite as high (same as Chas.) Similar things happen on the bigger LLS too.

I'm all ears as to a scientific explanation of why these things are the way they are when it comes to carbs.


Jon
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Re: Ebay Score

Post by Adrian Dale »

Re the cowl, its all about fluid flow. A cowl provides linier flow whereas to remove the cowl produces turbulent flow as the air eddies around the sharp edges. Turbulent flow will restrict the volume of air available and reduce the velocity. A small carb will create a higher velocity through the throat and across the jet for the same engine reves.

AJ.... Stay safe with the rain and wind.
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Re: Ebay Score

Post by Gannet »

Yes Adrian, that seems quite straightforward, but why did Villiers fit a nice expensive trumpet which looks like it was designed to create laminar flow and then add a restrictor which surely would create turbulent flow at the entry to the carb? As the revs are lower without the cowl one can presume less air is sucked in under these conditions ie the flow ie even more turbulent. What is the result of running with the cowl less the restrictor, as one would think that air fow would be more laminar and mass flow higher?
Interesting or not?
Jeremy
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