Nothing to do with Silver Swallows engines
03-14-2012 | 04:17 PM
#1
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Nothing to do with Silver Swallows engines
These two engines have come into my hands from separate sources. Both are new unrun Super Tigre G40 racing engines.
The glow is in c/l form with a big venturi hole which would necessitate running on crankcase pressure or a bladder.
The second is very interesting because it has a very nicely made two piece diesel head.
The engine head screws and the ones for the 2-piece head are not fitted right now.
I have the former but need to get some M2 screws for the latter. Then I can run the engine.
Ray
The glow is in c/l form with a big venturi hole which would necessitate running on crankcase pressure or a bladder.
The second is very interesting because it has a very nicely made two piece diesel head.
The engine head screws and the ones for the 2-piece head are not fitted right now.
I have the former but need to get some M2 screws for the latter. Then I can run the engine.
Ray
03-14-2012 | 04:23 PM
#3
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RE: Nothing to do with Silver Swallows engines
The engine has an r/c throttle and may have been intended for some form of r/c club Pylon Racing.
The G40 has been around for decades in c/l form but is hardly cutting edge technology in PR.
The conversion could date from the early 1990's.
The two piece head has been created from the original glow head. The comp screw is a spare Taipan series 13 1/4" x 32 tpi.
Right now the contra piston sits against the top rim of the central hole. It's inserted from below.
I'd imagine that an important advantage of a two piece head is that it's easier to machine and perhaps lap the CP and the head.
The CP is machined from Aluminium alloy and is a very tight fot in the head. Perhaps it's shrunk in without an o-ring.
Regrettably there's no real practical use for a big diesel like this in c/l flying.
It's always going to be less powerful than when in glow configuration and the major advantage of more economy doesn't help.
Ray
The G40 has been around for decades in c/l form but is hardly cutting edge technology in PR.
The conversion could date from the early 1990's.
The two piece head has been created from the original glow head. The comp screw is a spare Taipan series 13 1/4" x 32 tpi.
Right now the contra piston sits against the top rim of the central hole. It's inserted from below.
I'd imagine that an important advantage of a two piece head is that it's easier to machine and perhaps lap the CP and the head.
The CP is machined from Aluminium alloy and is a very tight fot in the head. Perhaps it's shrunk in without an o-ring.
Regrettably there's no real practical use for a big diesel like this in c/l flying.
It's always going to be less powerful than when in glow configuration and the major advantage of more economy doesn't help.
Ray
03-14-2012 | 08:33 PM
#5
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RE: Nothing to do with Silver Swallows engines
I guess you's call it "custom". It's made from the original head. It was possibly made by the well know Australian tuner, Stan Pilgrim. Stan is one of the "Motor Boys" a group that will be well known to those more interested in the technical side of model engine construction. I believe that Stan may have originated the notion of this type of 2-piece head. Gordon Burford copied this idea in the batch of 200 (or so) Goldhead 15 FIRE diesels he produced in the 70's.
Ray
PS Actually it may have been a batch of 100 (or so) Goldhead diesels
Ray
PS Actually it may have been a batch of 100 (or so) Goldhead diesels
03-15-2012 | 02:05 AM
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RE: Nothing to do with Silver Swallows engines
Ray,
If there's no one up your way with M2 screws, the Nut House in Parramatta will have them.
Regrettably I'm out otherwise you could have them on Sunday [
][&o]
G
On second thought, there's a nut shop closer to me. I can get some tomorrow if you want.
How many?
How long?
G
If there's no one up your way with M2 screws, the Nut House in Parramatta will have them.
Regrettably I'm out otherwise you could have them on Sunday [
][&o]G
On second thought, there's a nut shop closer to me. I can get some tomorrow if you want.
How many?
How long?
G
