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Old 11 August 2012, 08:46   #1
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Engine Boffins.

The tell-tale on our BF50 has always been a PITA. The outlet spigot has an ID of approx 2mm, the rubber tube from the block fitting to the spigot has an ID of 4mm. This restriction meant that any tiny bits of crap that came through would block the spigot.
Anyway, the rubber tube has stretched slightly and last night it popped off and flooded the pan.

Much washing, flushing and spraying of WDF followed.

I've now fitted a longer rubber tube which hangs out of the bottom of the pan by 50mm and fitted cable ties either side to keep it there and dumped the restricting spigot.

My question being, is the greatly increased tell-tale flow likely to hinder the motor in reaching correct operating temp?
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Old 11 August 2012, 09:22   #2
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Could mean the stat wont fully open , whether that means the engine will run cooler and increase consumption, you could only try it and find out, I suspect this would be more relevant if you were running on a near frozen lake or something though

bollox ... scratch all that....
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Yes
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Old 11 August 2012, 09:41   #3
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You'd need to sit down and work out the difference in flow rates?

One way not very scientific way of working it out would be to take the temp of the tell tale using the two differenct sizes of pipe?

I know on the Yams we use the flow rate increases once the stat is open and its an obvious change in flow.

I personally wouldn't be too worried.
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Old 11 August 2012, 09:55   #4
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I ran it for 10 mins on muffs, the block felt good and hot, but the tell-tale flow was stone cold.
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Old 11 August 2012, 10:01   #5
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Only way to tell would be run it with each pipe.
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Old 11 August 2012, 11:49   #6
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It'll be fine.
The old Soozook 2-stroke tell tales used to block up with salt for the same reason. The local dealers used to drill out the tell tale spiggot to avoid this happening.
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Old 11 August 2012, 15:06   #7
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No, it doesnt make a difference, we tested the RNLI engines for weeks with different size tell tale holes, they pressure and temperature stayed pretty much the same. The RNLI no have a much bigger tell tale outlet to stop this from happening.
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Old 11 August 2012, 15:28   #8
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Cheers chaps.

The whole outfit had a proper beasting this eve. We've had S/SW winds for the last few days which have produced big swell running in the South facing rivers. We took the SR and a pals PWC out in the Helford this eve, it was mad. We were three up, wetsuited in the SR. Independent reports (in the pub after) from shore and water, reckoned that we were getting between 12 and 16ft of air under the Searider.
The new stainless prob has made it far more responsive to allow such antics. At no time did it get stupidly hairy. I didn't imagine that a little 4m rib could dish out out such extreme fun. A guy in the pub after said "That little rib is mad, what is it?".
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Old 12 August 2012, 18:09   #9
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Cool.

Only twist i would throw in is that i believe Merc altered the telltale nozzle on the Clamshells for much the same reasons discounted above...

Keep an eye on it.
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Old 14 August 2012, 02:13   #10
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what an amazing coincidence. This happened to another member on here yesterday with a yam 50 but the result was a lot worse and the engine is now in the back of my car after salt water got into the head.

back to your original question: as above it will be fine but please do make sure you put a nice jubilee clip on the join to stop it popping off
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