Notices
Beginners Beginners in RC start here for help.

GMS engines......Good? Bad?

Old 11-28-2005, 10:04 AM
  #1  
Papa_John
Junior Member
Thread Starter
 
Join Date: Nov 2005
Location: camarillo, CA
Posts: 15
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default GMS engines......Good? Bad?

I need to purchase a .90 size engine and the cash is tight. I was looking at a GMS and since I know nothing about that engine can somebody please give me a heads up on buying one. It's going in a CG Ultimate Bipe that will be used for sport flying not 3D

Thanks
Papa_John is offline  
Old 11-28-2005, 10:18 AM
  #2  
ckangaroo70
My Feedback: (51)
 
ckangaroo70's Avatar
 
Join Date: Oct 2003
Location: London Mills, IL
Posts: 2,354
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

GMS are So So
A Super Tigre G90 would be a better choice, and the price is right as well. I would spring for an aftermarket exaust because the ST's is quite bulky, and has a tendency to loosen.
ckangaroo70 is offline  
Old 11-28-2005, 11:21 AM
  #3  
XTOL
Senior Member
 
XTOL's Avatar
 
Join Date: Oct 2004
Location: Galesburg, IL
Posts: 571
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

For what its worth I have a GMS 47 in an old Sig Kougar and it has run
nearly perfect since day one. Not a bit of trouble and it hauls the
old Kougar around with authority. I would not hesitate to buy another.

Mike Hammer
XTOL is offline  
Old 11-28-2005, 11:26 AM
  #4  
exeter_acres
Senior Member
My Feedback: (2)
 
exeter_acres's Avatar
 
Join Date: Sep 2004
Location: Johns Creek, GA
Posts: 7,457
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

My only experience is helping a buddy tune his....

it was a GMS 1.2

dead stick after dead stick after dead stick.... it is in a box with something like "return to sender" on it
exeter_acres is offline  
Old 11-28-2005, 11:42 AM
  #5  
britbrat
Senior Member
 
Join Date: Jun 2004
Location: Deep River, ON, CANADA
Posts: 3,299
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

My GMS .47 is no longer with me. My GMS .76 is still there, but what a pain in the tail -- can't hold a tune any better than Kris Kristofferson.
britbrat is offline  
Old 11-28-2005, 01:57 PM
  #6  
Papa_John
Junior Member
Thread Starter
 
Join Date: Nov 2005
Location: camarillo, CA
Posts: 15
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

LOL......very descriptive but not too kind to Mr. K (but it is the truth) Not sounding good for GMS so far.
Papa_John is offline  
Old 11-28-2005, 04:10 PM
  #7  
ckangaroo70
My Feedback: (51)
 
ckangaroo70's Avatar
 
Join Date: Oct 2003
Location: London Mills, IL
Posts: 2,354
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?


ORIGINAL: XTOL

For what its worth I have a GMS 47 in an old Sig Kougar and it has run
nearly perfect since day one. Not a bit of trouble and it hauls the
old Kougar around with authority. I would not hesitate to buy another.

Mike Hammer
I have seen XTOL's gms 47 run, and his does run pretty nice, but he is our clubs engine guru, so we always expect whatever he has mounted to run good.
For everyone else without the magic touch, or without a touch of luck like me, I found my GMS .40 a little stubborn to tune, so I did what I do to all engines that don't cooperate, I got rid of it! I also got rid of two awful Tower .46 Engines made by GMS for Tower. I have heard of less troubles with the GMS 47 than with the Tower 46, so there performance/quality seems to change among various GMS Engines . I have never owned the GMS 90, so it may in fact be a better engine than the 40 I bought. I just wouldn't want to waste my money finding out, when I do know that the Super Tigre 90 ran pretty good for me, and seemed fairly easy to tune, and keep in tune. Experiences may vary though!
ckangaroo70 is offline  
Old 11-28-2005, 07:12 PM
  #8  
Papa_John
Junior Member
Thread Starter
 
Join Date: Nov 2005
Location: camarillo, CA
Posts: 15
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

I don't think GMS offers a .90 thats what it calls for, but I was looking at the 120......could be wrong
Papa_John is offline  
Old 11-28-2005, 07:53 PM
  #9  
Tom Nied
 
Tom Nied's Avatar
 
Join Date: Feb 2002
Location: Carol Stream, IL
Posts: 2,156
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

My GMS 47 runs great.
Tom Nied is offline  
Old 11-28-2005, 08:13 PM
  #10  
RC-Captain
Senior Member
 
RC-Captain's Avatar
 
Join Date: Nov 2002
Location: RCHill, NJ
Posts: 2,981
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

MAN... JUST GET AN OS ENGINE FOR YOUR PRIZE POSSESION. i THOUGHT OF BUYING A GMS FOR THE PRICE BUT WOULD NEVER PUT IT IN A NEW PLANE . THE TRAINER WOULD BE THE ENGINES FIRST TEST.
RC-Captain is offline  
Old 11-28-2005, 08:47 PM
  #11  
Mods-R-Me
Senior Member
My Feedback: (1)
 
Mods-R-Me's Avatar
 
Join Date: Jun 2005
Location: Antelope Valley, CA
Posts: 825
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

Get an Evo 1.00 NX. More Power, same size, and just $169.00. Just got one and it is fantastic. On the other hand, my GMS 1.2 never runs right. It's evil I tell you. EVIL![:@]
Mods-R-Me is offline  
Old 11-30-2005, 07:23 PM
  #12  
APIA
Senior Member
 
Join Date: Aug 2004
Location: Roanoke, TX
Posts: 302
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

If you know HOW TO TUNE an engine, the GMS line is very good. Most people bad mouth GMS as they are spoiled with OS engines. I recently picked up a black head (old) GMS .47 that was given to me by an OS guru and the thing pulls stumps if tuned correctly. It took me around 15 minutes to retune and the thing is scary.
-Tom
APIA is offline  
Old 11-30-2005, 07:52 PM
  #13  
britbrat
Senior Member
 
Join Date: Jun 2004
Location: Deep River, ON, CANADA
Posts: 3,299
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

ORIGINAL: APIA

If you know HOW TO TUNE an engine, the GMS line is very good. Most people bad mouth GMS as they are spoiled with OS engines. I recently picked up a black head (old) GMS .47 that was given to me by an OS guru and the thing pulls stumps if tuned correctly. It took me around 15 minutes to retune and the thing is scary.
-Tom

That's just a little bit arrogant Tom -- I suspect that more than a few folks here could give you PHD tuning lessons.

There are tuning tricks & tweaks to be sure, including minor surgery -- but there is also junk. A very good place to start looking for junk is stuck right on the front of a GMS engine. You shouldn't have to resort to surgery to fix the carb in a new engine. Even after the surgical fix, it will be modified junk, with a limited lifetime before you need another carb or even more radical repairs to the existing one. Some GMS carbs are reasonably OK, which is where the lucky folks that get one think that GMS makes great engines. However, too many examples have porous castings, non-cylindrical throttle bores &/or tapered throttle rotors & misaligned fuel-inlet ports on the NV.

Then you can have a look inside -- I've seen these "gems" with lapping paste still inside the engine -- guess what that does for its lifetime.

The only thing scary about a GMS is the wildly variable quality of the "finished" product.
britbrat is offline  
Old 11-30-2005, 08:26 PM
  #14  
smosher9
Junior Member
My Feedback: (2)
 
Join Date: Feb 2005
Location: Salisbury, MA
Posts: 28
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

I have 2 GMS's a 40 and 47. the idle mix is very touchy to set, differences in 1/16 of a turn can make a big difference. Set the high end 1st with a tach, then adjust the idle speed to @ 2300 rpm, check the transition and adjust low end mix slowly. with every tweak of the low end mix, go back and readjust the high speed mix. using a tach helps alot. I set the high speed mix to peak - 500 rpm. I use CP 10% and on the 40 engine with a 11x6 prop I get 11500 pk.

once tuned they run very well with lots of power, haven't had a dead stick once on either engine. With the change of weather here in New england I had to adjust the high speed mix but other than that haven't touched the settings.

Steve
smosher9 is offline  
Old 11-30-2005, 10:26 PM
  #15  
Tom Nied
 
Tom Nied's Avatar
 
Join Date: Feb 2002
Location: Carol Stream, IL
Posts: 2,156
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

I don't know, but I have to agree with Apia (Tom) & smosher9. I have two GMS 47's, one I have on a trainer, and it runs fine, right from my test stand running to on the plane. I do usually open up a new motor searching for metal flakes, tightening screws. And the the other looks just as good. Mine didn't need any "surgery", just a little tinkering with the tune, but mine hauls just fine. Hey,,, go ahead, buy the overpriced OS. I still like using good sound tuning techniques to get all my motors to run correctly. But then again, I like the TT GP42. I'm sure I'd like OS as well.
Tom Nied is offline  
Old 12-01-2005, 06:30 AM
  #16  
APIA
Senior Member
 
Join Date: Aug 2004
Location: Roanoke, TX
Posts: 302
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

That's just a little bit arrogant Tom -- I suspect that more than a few folks here could give you PHD tuning lessons.
Sorry for the "arrogance" britbrat, I'm sure that there are a whole lot of folks that could enlighten me in the art of engine tuning. I do not claim to be an expert engine tuner. I do understand the physics of how a carburetor operates, which simplifies the process... The GMS that I got did not need any surgury, just good old fashioned patience and some tuning know how. I am not here to bash OS engines, they are a fine product that are super easy to tune. I currently have a dozen or so laying around, I also have K&B, MDS, and ASP's that I got that could not be tuned and they all run perfectly. I am also the type that is strictly a kit builder. What good is this hobby if there is no challenge.
(By the way, I DO have a PHD in common sense, from the school of hard knocks)
-Tom
APIA is offline  
Old 12-01-2005, 02:18 PM
  #17  
Norm Nestie
 
Join Date: Apr 2002
Location: Gabriola Island, BC, CANADA
Posts: 414
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

Had 2 GMS 47's and wouldn't trust a Goldberg Ultimate or any plane to the maddeningly unpredictable nature of the GMS engines that I HAD. Not a lot more $ for a Thunder Tiger or Super Tiger. Invest the extra cash now on a good motor and you will never regret it. IMHO
Norm Nestie is offline  
Old 12-21-2005, 10:28 PM
  #18  
rustleruss
Member
My Feedback: (3)
 
Join Date: Oct 2005
Location: Gainsville, TX
Posts: 80
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

There is nothing bad about a GMS engine that a little loveing care would not fix like not driveing it into the ground and think its made of steel or not keep it clean or not break it in right or not tune it correct in the first place sure go out and get a high dollar OS peice of crap and read more of persons here that do not like GMS motors i wonder how many even own one but has something to say about them your not going to get a good answer here make up your own mind GMS is ok and a lot cheeper.[:@] good luck bro
rustleruss is offline  
Old 12-22-2005, 12:49 AM
  #19  
BigWes
Member
 
BigWes's Avatar
 
Join Date: Nov 2005
Location: Opp, AL
Posts: 65
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

I don't know crap about a GMS engine so I won't say anything about it one way or another. I have known some folks with them and those airplanes were always problematic. Mostly smaller ones if I recall correctly. Anyway, I do like the Supertigers for the price. I am an OS guy myself so I would suggest one of those. You here people bashing an OS because it is actually EASY to get up and running. Some people will say you arent very smart for using an EASY to operate engine cause you should be challenging your skills more. I call bull**** on all of that crap. I love an easy to use easy to tune engine. Maybe it costs a bit more up front but you'll spend more time flying and less time cussing. So, maybe you don't cuss, fine then you'll spend less time repairing damage from an untimely engine failure. I have always really enjoyed it when my old K&B would run great on the ground and for some reason would sputter on takeoff. That always causes constipation if you know what I mean. Anyway I wish you luck on whatever you decide. Do us all a favor and roll some video of the maiden after you get it up and running.

Wes
BigWes is offline  
Old 12-22-2005, 12:16 PM
  #20  
sdcranford
My Feedback: (4)
 
Join Date: Jun 2005
Location: Willard, MO
Posts: 305
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

Just get a Super Tigre. Great for the money. For a 2 cycle I always go S.T.
The stock muffler is not bad, but can be replaced for a much lighter one if your
plane ends up nose heavy.

Remember that old saying..."you get what you pay for".
sdcranford is offline  
Old 12-24-2005, 12:02 PM
  #21  
flightom
Member
 
flightom's Avatar
 
Join Date: Dec 2005
Location: Overijssel, NETHERLANDS
Posts: 35
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

And does someone has/had experience with an ASP engine?
flightom is offline  
Old 04-23-2006, 01:01 PM
  #22  
wolfen100
Junior Member
 
Join Date: Jun 2005
Location: new johnsonville, TN
Posts: 5
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

Gms engines seem to be fine...lot of bang for the buck ! Good power...Good idle...Good price... Will pull a tower 40 trainer straight ..."UP".. China has been improving the quality of their product's....Before the tune process, let some heat get into the engine. Don't rush it.. Poor cold weather engine ! Nice warm weather engine.. When the break in process is finished The engine will surprise Your flying buddy's..Make sure the carb is fully seated into the engine. I have Os...Saito..Gms..Tower.. engines....The performance & reliability of the Gms is as good the rest. ( No I do not sell them ).. ( No stock either ) LOL.. Good Luck....
wolfen100 is offline  
Old 04-23-2006, 05:15 PM
  #23  
Crash-D
Member
 
Join Date: Jan 2006
Location: Hastings, MN
Posts: 92
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

If money's tight and you want a great powerful reliable engine then get the Supertigre engine. They run great with little need for you to ever pull it apart and fix it to run right, they've got a 3 warranty, and come cheap. Personally i'd get a Super tigre over anything but a Jett engineering engine any time!! And those are expensive engines.

My 51 ringed puts out a crap load more power than a buddy of mines O.S. out at the field while I'm swinging a 11x6 hes swing a 10x5 and I'm still kickin his engines a**.

Darion
Crash-D is offline  
Old 04-23-2006, 07:32 PM
  #24  
pauluk2w
Senior Member
My Feedback: (7)
 
pauluk2w's Avatar
 
Join Date: Mar 2004
Location: Fort Dodge, IA
Posts: 712
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?


ORIGINAL: flightom

And does someone has/had experience with an ASP engine?
I love ASP/magnum engines. I have found them to be good reliable engines, easy to tune and so far have never had a problem with them. They may have a little less power than some other engines of comparable size but they are IMHO good value for money.
pauluk2w is offline  
Old 04-23-2006, 07:51 PM
  #25  
sigrun
Senior Member
 
Join Date: Jul 2003
Location: Dunnunda, AUSTRALIA
Posts: 1,042
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GMS engines......Good? Bad?

ORIGINAL: RC-FIEND
MAN... JUST GET AN OS ENGINE FOR YOUR PRIZE POSSESION. i THOUGHT OF BUYING A GMS FOR THE PRICE BUT WOULD NEVER PUT IT IN A NEW PLANE . THE TRAINER WOULD BE THE ENGINES FIRST TEST.
Perhaps while you were busy shouting you missed the part where he said, "I need to purchase a .90 size engine and the cash is tight"? Kinda' eliminates O.S. even without consideration of the fact that O.S.' 90FX wasn't exactly free of its own gremlins which came FOC with it in the blue box until quite recently. Just do a search on RCU for the well reported problems with carburation which plagued it for an aeon.

Similarly doing preliminary research for a value engine in that class which runs reliably. Prefer to avoid Super Tigre's G90. Disappointing to hear of the problems with the GMS' quality control.
sigrun is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.