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Old 18 December 2009, 10:14   #1
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Tiny Tach : 2 strokes, 3 cylinder engine

Can someone shed a light about the proper Tiny Tach model to buy for a Yamaha 2, strokes, 3 cylinder 60 HP engine. According to their web catalogue there are 2 models available :

1-TT226R-2X (3 cylinder Jet Skis)
2-TT226R-2XLR (Most multi-cylinder outboards)

Regularly use TT226NR-1C, but it's for 1-2 cylinder engine with 1 rev each 180, if you need to lenghten the wire pick-ups what type of wire will be needed, coaxial cable ?

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Old 18 December 2009, 12:02   #2
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TT picks up the signal from a single plug wire, doesn't it?

Doesn't matter how many cylinders you have - you need to know how many times the plug fires per engine revolution (typically 1 for a 2-stroke, 1/2 for a 4-stroke; though some go the easy route and fire twice as often with both plug firing on compression and exhaust cycles.)

I would hazard a guess that the standard 2c model is the one you need.

jky
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Old 18 December 2009, 15:51   #3
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Longer cable

I ran mine on idle check the reading, then lenghtened the cable 12 ft.

Solder on a longer wire to the tip.

Reading still the same so its quite easy to do.

Quote:
Originally Posted by Locozodiac View Post
Can someone shed a light about the proper Tiny Tach model to buy for a Yamaha 2, strokes, 3 cylinder 60 HP engine. According to their web catalogue there are 2 models available :

1-TT226R-2X (3 cylinder Jet Skis)
2-TT226R-2XLR (Most multi-cylinder outboards)

Regularly use TT226NR-1C, but it's for 1-2 cylinder engine with 1 rev each 180, if you need to lenghten the wire pick-ups what type of wire will be needed, coaxial cable ?

Happy Boating
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Old 19 December 2009, 12:12   #4
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Originally Posted by rib-x450 View Post
I ran mine on idle check the reading, then lenghtened the cable 12 ft.

Solder on a longer wire to the tip.

Reading still the same so its quite easy to do.
Hello, what model are you currently using in which 2 strokes, 3 cylinder engine ?
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Old 19 December 2009, 15:39   #5
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Model

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Originally Posted by Locozodiac View Post
Hello, what model are you currently using in which 2 strokes, 3 cylinder engine ?

Mine is a 3 cylinder 2 stroke, not sure of the model of Tiny Tach. It has a red face on it?



PM me if you need more info.
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Old 21 December 2009, 04:34   #6
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1/2 for a 4-stroke; though some go the easy route and fire twice as often with both plug firing on compression and exhaust cycles.)
Just to prevent confusion, that only works for 4- strokes, as by definition you can't do that on a 2- stroke!


Loco,

Why Tiny Tach? do you have a space problem on the console, or are you using it as an hour meter?

I ask becuase I went through the same thought process for my SR4, and eventually decided it was easier & just as cheap to get a "boat" tacho. Can pick up a used analog one for a song. Hour meters are similarly cheap.
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Old 21 December 2009, 09:11   #7
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Tiny Tack for your Yam

I bought a tiny tach for my 2 stroke 3 cylinder Yam 50 hp on a open Searider 4m.
the model was a Tiny Tach Commercial CTT2.

I submitted the question via their website, and received a reply from a "Richard Dunn" who was based in the UK. He was extremely helpful. I ended up purchasing the unit from him, and to complicate things, i asked for a custom extension to the cables (special order from USA) which Richard took care of. The entire process was painless and for a company with not such a strong internet presence, every time i emailed i had a very prompt reply.

As a device, its completely waterproof, you can read the spec online, but it helped me identify a problem with one of my cylinders and was well worth the money. The footprint is very small and very quick updating.

I will pass on richard's email address directly to anyone who PM's me but will not post online.

Thats my 2 cents.
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Old 21 December 2009, 13:47   #8
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Loco, Why Tiny Tach? do you have a space problem on the console, or are you using it as an hour meter?
Yeap was in the dilema to buy a Tiny Tach for inside engine as hour meter or separate gauges, have opted for separate individual basic gauges : tacho, hourmeter, voltmeter and compass on central console, and removable GPS and VHF hand radio on console compartment, just in case.. Thanks Donegaldan for the tech imput, ok, must be the Commercial TT 2 model. Good to know.

Last issue, what does OB stands for when buying tachos ?

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Old 22 December 2009, 04:37   #9
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Someone (Teleflex?) does a combined tacho / hour meter.

Outboard?
I think it might be to do with the way they work - outboard tachos usually take the signal from the alternator pulses, which are a nice 12-ish V linked directly to the crank, as the alternator is essentially built into the flywheel. On an Inboard, the alternator is belt driven, so the pulses per rev. can be very variable between two engines due pulley ratios etc on the belt and so they tend to work off the ignition circuits, which are differnet voltages, pulse rates etc.
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