Proper fuel for break in of "old" glow engines Super Tigres , HB - RCCanada - Canada Radio Controlled Hobby Forum
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Old 02-03-2012, 11:08 AM   #1
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Proper fuel for break in of "old" glow engines Super Tigres , HB

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I have a NIB Supertigre 75 and a NIB Super Tigre 90 old versions - Made In Italy round (concave ) head .

Also a NIB old HB 61

My quesiton is should these old engines be broken in on Castor fuel 20% or more ?
What fuel is appropriate after breakin ?
I typically use synthetic blend 18% for my newer glow engines .

All the synthetic vs castor threads out there are confusing particularily when discussion older vs new motors ringed vs ABC etc..
Any guidance would be appreciated . Thanks
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Old 02-03-2012, 03:03 PM   #2
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Re: Proper fuel for break in of "old" glow engines Super Tigres , HB

i have just used the same 18% synthetic fuel in all my glow engines and i have not had a problem. Not sure if thats what your "supposed" to do but i have not had any problems. but i always run them rich and just idle through the first tank
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Old 02-03-2012, 07:59 PM   #3
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Re: Proper fuel for break in of "old" glow engines Super Tigres , HB

try this
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Old 02-04-2012, 09:16 AM   #4
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Re: Proper fuel for break in of "old" glow engines Super Tigres , HB

When discussing fuel needs for older engines it important to first figure out the metallurgy that is inside the engine. "Older" engines that I play with have a steel piston and liner, some ringed, some lapped. Some have bearings on the crankshaft, a lot have a bushing. These babies need castor oil in order for you to get any life out of the engine. I can wear out a McCoy engine in 1 day if I use modern fuels.
Your Super Tigres are probably ringed, have an aluminum piston, a chromed liner and bearings on the crank. You can use the modern fuel.
So check the internals of your engines and see what you have.
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Old 02-04-2012, 09:46 AM   #5
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Re: Proper fuel for break in of "old" glow engines Super Tigres , HB

I run a lot of old engines and I add 141m of castor oil to a 4 ltr jug of Omega fuel. This will give you 20% oil. If when you run it and there is black in the oil residue on the the A/C, that means that the engines is eating it self alive and increase the oil content to 25%. All modern engines run fine on 20% oil fuel. The plain bearing lapped piston engines like 25% oil, like the Torpedo green head and Forester. Most ringed engines will run ok on 20% oil.
Old engine break-in: 1/4 throttle extremely rich, 12 to 15 min run. 1/2 throttle still very rich but not as rich as the first run 12 to 15 min., Use 1/3 throttle as a base line for cooling, go to full throttle and tune mixture so the engine does not four cycle any more, five second runs only, now spend the next ten minutes doing full throttle runs of five seconds and back to 1/3 throttle for a 20 second cooling period, for the next ten minutes keep increasing the length of time of the full throttle runs until at the end of the time it will hold full throttle for two minutes, do not shorten the cooling period.

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Old 02-05-2012, 05:01 PM   #6
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Re: Proper fuel for break in of "old" glow engines Super Tigres , HB

Originally Posted by CashKiller View Post
This fuel you referred to CashKiller, I believe is for the 2500/3500 series Super Tigers! A completely different animal that was designed to run on 12% oil or gasoline /oil mix. That fuel would spell disaster in those smaller engines!

rreale, did you not get a manual with those engines? If not, try & find one of the appropriate vintage & see what the manufacturer wanted them run on.

If in doubt I always add lots of oil. You will never destroy an engine with too much oil! Lower the performance? Yes. Carbon it up? Maybe, but it won't be ruined!
Hang time does not apply to ceiling fans, light fixtures, overhead door tracks or basketball nets!
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