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Silly question about 4 strokes

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nigel newby06/11/2018 01:21:47
154 forum posts
40 photos

I know this is a silly question, but do I need special fuel for a four stroke engine, or will my normal model technics 5% nitro be ok.

SIMON CRAGG06/11/2018 01:39:56
326 forum posts
5 photos

I have been using Weston 10% Prosynth 2000 for years. Works a treat!.

Tom Sharp 206/11/2018 01:48:56
3331 forum posts
17 photos

I don't know if it still applies but Model Tecnics did do a 10% four stroke fuel, I've still got some.

John Stainforth06/11/2018 03:22:44
286 forum posts
38 photos

One would presume that one distributor's 10% (say) nitro fuel would be more or less the same as another's. I'm shocked at how different they are in practice. In the UK, the one I trust the most (or distrust the least) is Optifuel.

I am seriously considering weighing every can of fuel I buy. Nitromethane is relatively dense compared with the other glow fuel ingredients, so this should be a fairly simple way to uncover the cheats.

Andrew Ray06/11/2018 06:19:29
680 forum posts
19 photos

Yes, normal 5% should work fine. It’s what I used for years although I use Laser 5 in all my engines now, 5% nitro and 15% oil.

Denis Watkins06/11/2018 06:43:52
3559 forum posts
166 photos
Posted by nigel newby on 06/11/2018 01:21:47:

I know this is a silly question, but do I need special fuel for a four stroke engine, or will my normal model technics 5% nitro be ok.

Silly Questions are those we don't ask Nigel

That is a great question. From the early days, we followed manufacturers recommendations and used "4 stroke fuel"

Usually a mix often without nitro.

With the advent of Synthetic oil, your Model Technics is ideal at 5%. For 4 strokes

We all have motors still flying after decades despite castor and high nitro, so long as we drain and clean up after a

days flying, and store using some form of " after run " oil down the carb and hand cranked round the innards

Peter Miller06/11/2018 08:20:28
9815 forum posts
1156 photos
10 articles

I have been using Model Technics Formula Irvine 10% nitro on everything from Cox .049s up to 91 four strokes for years.

It works, so why change it?

Jon - Laser Engines06/11/2018 08:30:06
4507 forum posts
164 photos

AS the others have already said 4 stroke fuel is a myth so dont worry. I recommend laser 5 or techpower 5 from model technics. In general you should not need more than 5% nitro if the engine is set up correctly

Cuban806/11/2018 08:48:33
2404 forum posts
9 photos

I followed Jon's advice a year or two ago and now run all my ASP and OS fourstrokes on Laser 5 mix. No noticable performance or tuning difference between the 10% nitro and 20% oil in the old fuel, except that the models do stay a bit cleaner.

nigel newby06/11/2018 18:05:13
154 forum posts
40 photos

Thanks for that chaps. Just needed to know. I often put 2 stroke fuel in my lawnmower, as we had a small motorbike which my grandson rides around the garden on. Rather than work out which can had 2 or 4 stroke petrol, I just added oil and made them all 2 stroke

Problem solved

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