Yanmar Beta debate

A

alan_critchlow

.
Nov 2, 2003
198
Hello all, It seems to me the difference between Beta and Yanmar is
one of marketing. Beta uses Kubota blocks. I would guess there are
many many more Kubota blocks than Yanmars here in North America.
Kubota has decided to sell their Kubotas to other companies for
marinization, Beta, Westerbeke, Nanni etc....
Whereas Yanmar elected to marinize their engines themselves. They are
both excellent choices. I agree that Yanmar has a higher perceived
value. It is a excellent engine line with good marine service
mechanics. But I feel the the Beta 13.5 is the best choice, not so
much that it may be a better engine but it is a better match to the
Vega.

Installation of the Beta was very easy on our Vega. Well, I guess it
should be as the boat's interior was completely gutted. I can imagine
it is abit of struggle with any engine install with the bulkheads in
place.

I have 400 hours on our engine now. A lot of hours. We only put the
boat in the water August 29 2005. Well, taking it 3000 km to Florida
will do that. Engine ran flawlessly after I put in the lift pump. I
have a teeny leak that is probably a loose clamp on the fuel line. We
ran the engine a top speed most of the time. We were faster then most
other boats on the intracoastal. I remember an Alberg 30 whose top
speed on flat water was 4.5 knots. I felt a little guilty as we
passed him going twice his speed in a 20 knot headwind.

Alan & Felicity V1639 Voila
 
P

pjacobs55

.
Oct 30, 2019
1,459
Alan:
I have a Yanmar 2GMF 13 hp, similar in power to your Beta. I'm curious:
What is your reduction gear ratio and what are your prop specs?

Thanks!

Peter
#1331 'Sin Tacha'
 
W

wxt8981

.
Oct 31, 2019
562
Alan;
in case you're interested, I have the Yanmar 1GM, reduction
gear 261:1, 13"x8" 3 blade prop for 25mm shaft.
At 3000 rpm it pushes me (calm sea) 6.5 mph. Fuel
consumption is about 4 to 4.5 hours per gallon.
Wilhelm, V-257
 
A

alan_critchlow

.
Nov 2, 2003
198
Hello, My Vega is now in Florida so I could not check it out. I
gleaned from the brochure on GB Vega website that it has a 12" D * 8"
P with a 2.6:1 reduction gear. Full out, it can push our Vega to
almost 7 mph. Felicity does not like motoring so she pushes it to
almost full speed. At that speed it drinks about 1 1/3 litre per
hour.

At 5.5 to 6 knots I get more than 20 hours to the tank. I know that
because we ran out just arriving at Cape May after an overnight motor
trip. We had to make the inlet under sail. The inlet was crowded with
small fishing boats with a strong current. Felcity was unconcerned.
She was at the helm. I was terrified.

Alan
 
X

xiphion1209

.
Oct 31, 2019
19
Hi

I have a Yanmar 2GM - Raw water cooled - Should be same as yours without
fresh water cooling. Think mine is circa 18hp, are you sure your\'s is only
13hp?

From memory:

Gear box is 2.21 revs of engine for 1 rev of shaft

I have a right handed 14 by 11 3 bladed prop that pushes her along with
clean bottom @ 7kts - I did try a 12 by 9, but this was like a whisk, only
giving me 5kts at full power (and a screaming engine)

A bit over powered, but I had little choice with engine as I work in the
trade and it was on the cheap ( £250 ) so I made her fit. Original engine
was petrol - Chopped out old engine beds and fitted new ones to accommodate
yanmar.

I never run at full power unless punching tide / strong head wind -
Excellent at 3/4 throttle - Motors in flat calm to / from France without
missing a beat in good time - Even when loaded with essential wine
stocks.......



Tim Buckley
Shipshape Services Ltd.

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P

pjacobs55

.
Oct 30, 2019
1,459
Very interesting .... according to a pre-purchase survey mine is a
2GMF 13 hp (confirmed by a tag on the engine). The box is 2.62:1
reduction, 1" shaft, and the prop is a 12" right hand 3-blade with
10" pitch. She seems to motor along quite well at 2800 rpm. Not sure
what speed; I'll have to check the gps next time I'm out, but I would
guess 5 to 5.5 knots.

Must be nice living so close to 'wine country'. My cross border hops
are limited to visiting micro breweries :)

Peter.
#1331 'Sin Tacha'
 
W

wxt8981

.
Oct 31, 2019
562
Hi Jakob;
looks like your boat has a new stern-bearing, because a 1"
shaft doesn't fit into the original 25 mm. That means you
also can't use the original stuffing box which I think is a
shame- I've never seen a better one.
According to the performance curves, the 1GM runs best
around 3000 rpm, and with my 2.61:1 ratio and 13"/8" 3
blade prop pushes about 6.5 mph (not knots)
Wilhelm, V-257
 
L

laetitia1930

.
Oct 30, 2019
8
Hello,

I want to change my old Volvo MD6 for a new engine, I can read in ths group who a
lot of Vega owners changed the old Volvo for a news Beta or Yanmar, but nobody
speak about a new Volvo.
Because the owners not instaled a news Volvo? Anyone know it?

Thanks

Xavier
Laetitia V1930
Mediterranean sea.
 
S

stevebirch2002

.
Nov 8, 2001
1,818
There are a few Vegas that have changed to 2002, 2010 etc but the price
of the Volvos seems to preclude them from the equation! Cost of spares
is another factor.

Cheers

Steve Birch (Technical)
 
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