Cruisers Forum
 


Join CruisersForum Today

Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 28-06-2018, 07:24   #1
Registered User
 
rgleason's Avatar

Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 13,532
Serpentine Belt advantages

I've done some searches and have come up with this list, it would be helpful to get some confirmation on the advantages from actual users, qualitative as well as quantitative.

Serpentine belt advantages:
  1. drives larger alternators easily
  2. more efficient power transfer, less energy loss to belt.
  3. uses less energy, more efficient, requires less HP
  4. less belt tension required, better for bearings on engine and alt
  5. belt tension is not as big an issue as V.
  6. less slippage, less heat
  7. less dust
  8. quieter
Serpentine is not necessary for up to 100 amp alternators.
__________________

rgleason is offline   Reply With Quote
Old 28-06-2018, 07:43   #2
Registered User
 
Training Wheels's Avatar

Join Date: Aug 2014
Location: Left coast.
Posts: 1,132
Serpentine Belt advantages

Funny, I just ordered a serpentine belt conversion for my 70A alternator. Got tired of the belt dust.
__________________

Training Wheels is online now   Reply With Quote
Old 28-06-2018, 07:57   #3
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 26,908
Serpentine Belt advantages

Iíd say 80 from just my experience is the absolute max on a single belt and only then if you donít mind excessive tension and alignment is spot on perfect.
Why would a serpentine belt be more efficient? If it is due to tension etc., not sure itís a big difference. For me the deciding factor was the excess tension and belt dust from a single belt.
My stock 80 would start dusting as soon as tension even approached correct, and I assume once the belt starts throwing dust, itís worn slick and is thinner than it should be and you need to replace it.

Just from appearances my serpentine may last the life of the engine, itís not being bent backwards like they normally are with an tensioner pulley, and so far I can detect no wear.
a64pilot is online now   Reply With Quote
Old 29-06-2018, 04:23   #4
Registered User

Join Date: Jan 2008
Location: Caribbean
Boat: Island Spirit 401 Catamaran
Posts: 478
Re: Serpentine Belt advantages

Quote:
Originally Posted by Training Wheels View Post
Funny, I just ordered a serpentine belt conversion for my 70A alternator. Got tired of the belt dust.
Training Wheels- Where did you get the kit. I am well past being tired of the dust
Ostinato is offline   Reply With Quote
Old 29-06-2018, 04:39   #5
Registered User
 
rgleason's Avatar

Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 13,532
Re: Serpentine Belt advantages

Quote:
Why would a serpentine belt be more efficient? If it is due to tension etc., not sure it’s a big difference.
Good question. I'll hazard a guess. The V depends on tension and friction from driving the belt down into the V, the same forces have to be removed for the belt to become free, thus there is an additional load on the engine.

If a V and a serpentine belt were tensioned on two freely spinning pulleys, which one would be easier to spin? It can't be too much of a difference, but I am pretty sure there is one.


I have a question actually 2.

Is there any belt dust with serpentine?
Is it quieter?
rgleason is offline   Reply With Quote
Old 29-06-2018, 05:21   #6
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 26,908
Re: Serpentine Belt advantages

Quote:
Originally Posted by Ostinato View Post
Training Wheels- Where did you get the kit. I am well past being tired of the dust


I think Balmar bought someone out and most are Balmar Alt Mount Kitís.
Google for best price, although we do have at least one sponsoring vendor here that sells them, maybe more.
Electromaax also sells a kit, that is I believe lower price than Balmarís.
However there have been many reports of people not being happy with their after the sales and warranty service, where I donít think I have ever heard of an issue with Balmar.

Kit is a two beer job on my engine, changing the alternator pulley was the hardest part, installing on the engine is easy.
You may want to transfer the TDC Mark from your factory crank pulley to the serpentine pulley, the serpentine pulley just overlays the factory one as it is also usually a harmonic balancer, but mine covered the TDC mark.
Real easy install. I also got a spare belt, but it looks like it may never be needed.
a64pilot is online now   Reply With Quote
Old 29-06-2018, 05:23   #7
Registered User
 
Training Wheels's Avatar

Join Date: Aug 2014
Location: Left coast.
Posts: 1,132
Re: Serpentine Belt advantages

Quote:
Originally Posted by Ostinato View Post
Training Wheels- Where did you get the kit. I am well past being tired of the dust


PKYS. Very knowledgeable.
Training Wheels is online now   Reply With Quote
Old 29-06-2018, 05:26   #8
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 26,908
Re: Serpentine Belt advantages

Quote:
Originally Posted by rgleason View Post
Good question. I'll hazard a guess. The V depends on tension and friction from driving the belt down into the V, the same forces have to be removed for the belt to become free, thus there is an additional load on the engine.

If a V and a serpentine belt were tensioned on two freely spinning pulleys, which one would be easier to spin? It can't be too much of a difference, but I am pretty sure there is one.


I have a question actually 2.

Is there any belt dust with serpentine?
Is it quieter?


Zero belt dust.
Serpentine belt squeaks a little for the first minute after I start, then is quiet. I have no idea why, I have not put belt dressing or anything on it cause itís not an issue, just donít know why it squeaks for a minute, not a loud squeak.
Perhaps I donít have it tight enough, I run it about like you run a normal car belt, 1/2 ď of movement when pushed by your thumb with just a little pressure, but it does not slip. I figure real tight is bad on bearings.
a64pilot is online now   Reply With Quote
Old 29-06-2018, 07:51   #9
Registered User
 
Jammer's Avatar

Join Date: Jan 2010
Posts: 1,306
Re: Serpentine Belt advantages

Quote:
Originally Posted by rgleason View Post
Serpentine belt advantages:


The advantage of multi-V belts is that they offer a larger contact area for a given pulley diameter without requiring multiple belts. Every other benefit comes from that.


The "serpentine" feature, where the belt is routed in such a way that the back of the belt is used to drive certain accessories in a reverse direction, is used in automotive applications, but is not ordinarily used in alternator conversions on marine engines.



Quote:

  1. drives larger alternators easily
Can also do with multiple belts. In some cases, there are kits available.



Quote:

  1. more efficient power transfer, less energy loss to belt.
  2. uses less energy, more efficient, requires less HP
  3. less belt tension required, better for bearings on engine and alt
  4. belt tension is not as big an issue as V.
  5. less slippage, less heat
  6. less dust
  7. quieter
V belts behave badly when overloaded and when run on pulleys that are too small. All the things you list are symptoms of an overloaded belt that has been overtensioned to make it work.


Now, switching from a V belt to a serpentine belt is certainly one way to fix that, and there are kits available, and it's a solution that fits the space easily. That doesn't mean that it is the only possible solution, or the best one for cruising.


The main drawback of multi-v belts is that replacement parts availability is comparatively poor. Compounding this, the alternatives for a temporary repair are also poor. In contrast, you can get v-belts everywhere, and can get by with a v-belt that isn't an exact match, at least for a while.


I would prefer a 2-V or 3-V setup over a serpentine setup, for cruising, for these reasons.


Using undersize alternator pulleys to improve output at idle makes matters worse. A large frame alternator, that will perform better at low speeds, will put fewer demands on the belt drive system overall.
Jammer is offline   Reply With Quote
Old 29-06-2018, 11:01   #10
Registered User
 
phantomracer's Avatar

Join Date: Aug 2010
Location: Boston, MA
Boat: 1968 Ohlson 38 Sloop
Posts: 862
Images: 9
Send a message via Yahoo to phantomracer
Re: Serpentine Belt advantages

installed the alt-belt kit from Balmar on my yanmar 3gm-30 w/100amp balmar alternator

The alternator WAS eating belts.. engine bay was all black from dust.

The serpentine belt made a huge difference. Still a hair of dust, but not a dust storm like before. Afraid of making the belt too tight and damaging something.
__________________
Paul S
Blog - https://www.facebook.com/ohlson38project
website http://www.mildredrose.com
phantomracer is offline   Reply With Quote
Old 29-06-2018, 14:18   #11
Registered User
 
rgleason's Avatar

Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 13,532
Re: Serpentine Belt advantages

Quote:
All the things you list are symptoms of an overloaded belt that has been overtensioned to make it work.

I have a small case 90-65 amp Balmar from 1995, I don't have the belt tightened too much (1/4" as instructed) and I get belt dust on this new, becoming old, engine.


Very Good point about availability, but they send you two belts and a64pilot says he doesn't think he'll be using the second one.


Just to be a bit argumentative, both belt types have friction, however I believe the V has more. Don't know if it is worthwhile trying to measure it, but the design of the V is intended to clamp the belt creating friction. Maybe the newer belt is a response to some of the V belt issues? -I know nothing about belts really, except my Dad was an inventor and was always building stuff. One of his favorite things was a stick of "belt grease". He would get his machines going and then apply the stick to the back of the belt that was slipping. It was a little dangerous but worked like a charm. Maybe that's what we all need so we can have a looser belt that does not dust..


I guess these belts aren't really noticeably quieter.


Thanks for all the good feedback. Did any of you making the change to serpentine have to change your system coolant pipes? I saw a note about possibly having to change the lower coolant pipe on a 3ym30 (on PKYS site). Can anyone who has 3YM30 and serpentine, confirm this or advise otherwise?
rgleason is offline   Reply With Quote
Old 29-06-2018, 17:53   #12
Registered User

Join Date: Jan 2017
Posts: 12,163
Re: Serpentine Belt advantages

Serpentine means no worries if your **continuous output** is 60-70A or above.

There are so many vee belt configurations, I'm sure between there and 100A, some of them don't produce much dust.

But if you need to upgrade, why not go to the certain solution?
john61ct is online now   Reply With Quote
Old 29-06-2018, 18:05   #13
txg
Registered User

Join Date: Oct 2014
Location: Berlin - Germany
Boat: Dufour 35
Posts: 195
Re: Serpentine Belt advantages

Our Mitsubishi/Vetus engine came with a stock 110A alternator and a single v-belt.



At cruising RPM it produces a continuous output of about 90-100amps. There is not much belt dust or wear. Recently i changed the belt for the first time just to be on the safe side. The old belt still looked okay so i kept it as an emergency spare. The old belt was used for more than 700 hours.



So there is no reason to switch to serpentine for us...
__________________
www.milasailing.com
txg is offline   Reply With Quote
Old 29-06-2018, 18:55   #14
Registered User
 
deluxe68's Avatar

Join Date: Apr 2009
Location: Arizona/Rhode Island
Boat: Swan 432
Posts: 807
Re: Serpentine Belt advantages

Quote:
Originally Posted by a64pilot View Post
Iíd say 80 from just my experience is the absolute max on a single belt and only then if you donít mind excessive tension and alignment is spot on perfect.
Why would a serpentine belt be more efficient? If it is due to tension etc., not sure itís a big difference. For me the deciding factor was the excess tension and belt dust from a single belt.
My stock 80 would start dusting as soon as tension even approached correct, and I assume once the belt starts throwing dust, itís worn slick and is thinner than it should be and you need to replace it.

Just from appearances my serpentine may last the life of the engine, itís not being bent backwards like they normally are with an tensioner pulley, and so far I can detect no wear.
Heat builds up on a v-belt partly because of how much it has to bend around the small pulleys. The fact that they are much thicker than serpentine belts means there is more stress on them. Heat is a big killer of small v-belts.

The other killer is abrasion from corroded steel pulleys. The serpentine kit I have from Balmar is aluminum so it should not wear down the belt.
deluxe68 is offline   Reply With Quote
Old 29-06-2018, 19:04   #15
Registered User
 
deluxe68's Avatar

Join Date: Apr 2009
Location: Arizona/Rhode Island
Boat: Swan 432
Posts: 807
Re: Serpentine Belt advantages

Quote:
Originally Posted by phantomracer View Post
installed the alt-belt kit from Balmar on my yanmar 3gm-30 w/100amp balmar alternator

The alternator WAS eating belts.. engine bay was all black from dust.

The serpentine belt made a huge difference. Still a hair of dust, but not a dust storm like before. Afraid of making the belt too tight and damaging something.
When we opted for the AT-165 alternator we also put the belt kit on our 4JH2E, the spacing was about 1/2Ē off on the water pump. I had to pay the boatyard to fabricate a spacer to get it lined up correctly. When I contacted Balmar they could not care less that their product did not fit correctly.
__________________

deluxe68 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pulley alignment for serpentine belt Jd1 Electrical: Batteries, Generators & Solar 4 12-05-2014 20:15
Serpentine Belt Rusty123 Electrical: Batteries, Generators & Solar 12 10-11-2013 21:12
For Sale: Serpentine Belt Kit CampDavid Classifieds Archive 7 11-01-2013 10:51
For Sale: Perkins 4108 Serpentine belt kit jmackay Classifieds Archive 4 24-12-2012 13:19
Serpentine belt conversion for Universal Diesel SaltSeaSailor Engines and Propulsion Systems 2 22-04-2009 09:01

Advertise Here


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 12:35.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
×

ShowCase vBulletin Plugins by Drive Thru Online, Inc.