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Post  getback on Mon Apr 18, 2016 10:16 am

Of possibly haven't to drill the Head screws out to get cleaned up so it will turn over and hopefully run , ihave boiled it twice in anti-freeze ,, I guess I just want to know if anyone has any experience with a THUNDER TIGER .15 MOD. 7703
?/ Thanks for any input ... Is this Engine Worth going to the trou... Thunde12 Is this Engine Worth going to the trou... Thunde10 Is this Engine Worth going to the trou... Thunde11 Eric Very Happy
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Post  badbill on Mon Apr 18, 2016 10:18 am

Take the carb off and hit the head with a torch for a minute of so, then the bolts should come right out.
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Post  pkrankow on Mon Apr 18, 2016 10:38 am

A torch is possibly too much, try a heat gun first. Aluminum expands more than steel so the screws should come out easily when hot. When castor is bubbling out of the gaps it should be hot enough.

The carb screws are probably glued in too, so heat is needed there as well.

Phil
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Post  getback on Mon Apr 18, 2016 12:11 pm

Yes that is good advice and just haven't got to it yet ... But are these pretty good engines (it there is nothing wrong inside) I have Enyas and OS .15 I think RCs .. Eric
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Post  Surfer_kris on Mon Apr 18, 2016 12:32 pm

Just warm it up in an oven or with a heat gun. Most of the time you don't even need to take them appart.

Not sure which model you have there, is it loop scavanged?

These are quite nice engines, lightweight and farily powerful for their weight. The one I have (loop scavanged, steel/iron construction) will do around 14000rpm on a 8x4 prop.
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Post  badbill on Mon Apr 18, 2016 12:45 pm

pkrankow wrote:A torch is possibly too much, try a heat gun first.  Aluminum expands more than steel so the screws should come out easily when hot.  When castor is bubbling out of the gaps it should be hot enough.

The carb screws are probably glued in too, so heat is needed there as well.

Phil

FYI only, a torch is fast and works great, won't hurt anything. Been using one for this for many years.
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Post  Mark Boesen on Mon Apr 18, 2016 1:42 pm

These are nice little engines, basically a knock-off of a O.S. .15
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Post  Surfer_kris on Mon Apr 18, 2016 2:08 pm

Mark Boesen wrote:These are nice little engines, basically a knock-off of a O.S. .15

I don't know, which OS engine would that be?
It looks more like an Enya to me...?
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Post  getback on Mon Apr 18, 2016 2:34 pm

Surfer_kris wrote:Just warm it up in an oven or with a heat gun. Most of the time you don't even need to take them appart.

Not sure which model you have there, is it loop scavanged?

These are quite nice engines, lightweight and farily powerful for their weight. The one I have (loop scavanged, steel/iron construction) will do around 14000rpm on a 8x4 prop.
I don't know what that means but its a 7703 as I posted Kris , Eric
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Post  getback on Mon Apr 18, 2016 2:36 pm

Mark Boesen wrote:These are nice little engines, basically a knock-off of a O.S. .15
Thanks That is more what I was looking for . Eric
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Post  Surfer_kris on Mon Apr 18, 2016 2:49 pm

getback wrote:
Mark Boesen wrote:These are nice little engines, basically a knock-off of a O.S. .15
 Thanks That is more what I was looking for . Eric

I would still like to know which OS engine that would be...?

I can't remember seeing any OS .15 engine with a crank-case like that?
It was Enya (and Fuji, HB etc.) which had the removable, and rotatable, front and no removable backplate.

After googling a bit it seems this is perhaps the first version of the .15 engine from TT. The one I have is possibly slightly younger, but still with the the baffle on the piston.

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Post  Mark Boesen on Mon Apr 18, 2016 4:29 pm

Sorry, i typed faster than i thought...i think Kris is correct, it looks like the design was swiped from Enya, not O.S., but still a decent engine.

http://www.osengines.com/history/ostimeline04.html
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Post  gcb on Mon Apr 18, 2016 8:07 pm

When TT started out they were copying Enyas. During that phase quality was hit and miss because the makers were learning. I saw one that had broken when someone flipped it in the hobby shop. Others were great. I would clean it up and try it. Since it has been run I would guess that it is one of the good ones.
TT quality grew by leaps and bounds. The ones I have are similar to the OS FP with some exceptions like the venturi (yes, CL) uses a sprinkler similar to a COX TD. All of my TT's (.10 to .25) are excellent runners. Here is the TT .10.

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