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Super tigra G3250

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Old 06-27-2013, 02:25 AM
  #1
Delta Sierra
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Default Super tigra G3250

Hi All
I am having problems with both my supra tigra motors a G3250 and a G75 ringed. They both burn out the glow plugs within 20 minutes. I am using OS medium and OS hot plugs and there is no differance. The G3250 I am runing 5 literMorgans fuel 15% nitro mixed with 5 liter metonol to bring down the oil content. With the G75 ringed i am running Morgans 10% nitro. Any sugestions would be greatly Appreciated.
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Old 06-27-2013, 03:40 AM
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Default RE: Super tigra G3250

Why would you want to bring down the oil content?

doing that, you are not just cutting the oil content by half, but the Nitro content as well!
Vibration is also not good to the Glow Plugs, have you balanced the propellers?
Are you using a glow driver?
Are you letting the ni-starter sitting over the plug for a long time before the engine starts?

Take Care.
Mauricio
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Old 06-27-2013, 09:28 PM
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Default RE: Super tigra G3250



Hi
From what i have read on a few forums big ST's run best on 10 to 12 % oil content and 7% or less nitro.
Props have been balanced.
Glow driver is a standard over the counter.
I bought 2 OS F plugs and will see if that helps. i think this will do the trick with the G3250.I am not to sure if they will work on the G75 as the plug looks a bit longer will that not interfear with the piston.

Thanks for the sugestionsMaurico every bit of advice can help

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Old 07-05-2013, 10:39 AM
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Default RE: Super tigra G3250

All SuperTigre engines tend to run well on lower nitro fuels. The big 'Tigres, like the G-3250 like 0%-5% with 10%-12% castor oil as the lubricant. Methanol is the rest of the fuel. Even the G-75 will do better on 5% nitro, but you do need an 18%-20% oil content in that one.

For fueling purposes, the G-2300 is not considered "big". It needs 18%-20% oil content, but nitro still should be kept low.
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Old 01-07-2014, 12:07 AM
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Thanks
i have changed the plug to an OS F and that seems to have solved the glo plug problem, the problem i am now having is as soon as my fuel level hits about half a tank the motor cuts out. I am running a pitts muffler and have heard that this is not giving me enough pressure in the tank to push the fuel through to the carb at lower RPM. What has been suggested is that i should block one of the exhaust exits to increase the pressure in the tank or decrease the bore size in the carburator to create greater suction. which way would be the best route to follow.
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Old 01-07-2014, 09:16 AM
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Whichever works. Reducing exhaust outlet would be easier, though.
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Old 01-07-2014, 09:00 PM
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I was thinking along the same line.
Thanks
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Old 01-15-2014, 02:19 PM
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How about installing a pump? I think they make such a thing. I know Perry use too and I believe still does? Regards
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Old 01-16-2014, 08:36 AM
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Pumps can work to solve a fuel-draw problem. Their biggest drawback can be that they provide too much pressure at low throttle settings. This can cause problems if they are not regulated. There are regulated fuel systems that will work excellently available from various manufacturers.
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Old 02-24-2015, 01:33 PM
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I have both the G2300 and the 3250 Super Tiger Engines and find that they both run
better on straight fuel with no nitro than with even 5%, I use a good quality OS glow plug
long reach plug, not 4-stroke, and my plugs generally last for quiet some time. Both engines
are mounted "sidewinder" with Bisson Pitts mufflers.I always add approx. 2 oz of castor to the
blended fuels that I buy just to be on the safe side. I have Super Tiger's from the 40 right up
through the 3250 and have in the past even run my 40 & 51 on a no nitro fuel without any
problems other than having to tweak the needle slightly and have never seen a noticeable
drop in RPM from not having any nitro in the fuel, but the 2300 & 3250 do not like anything
over 5% and are a lot more happier on a blended synthetic-castor methanol mix that with
added nitro. With the larger engines running on "Straight Fuel" they are more economical
dollar wise but they do tend to gulp it up rather quickly.

Bax Hurry up and get some of those new Tigers in need a couple new 61's

Bill D.
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Old 02-25-2015, 07:37 AM
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'Tigres were designed for no/low nitro fuels, and run best that way for sure.
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