HaveBlue
Posts: 852
Joined: 1/3/2005
From: Sydney, AUSTRALIA
Status: offline
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quote:
ORIGINAL: N1EDM
Hi HaveBlue,
I just took the backplate off my GS045 and I don't see a dimple on the conrod. I presume that it faces foreward. I tried to take a photo but couldn't focus quite tight enough.
I can't recall what RPM's my GS-45 ran with a 10x6 prop, but it was probably somewhere approaching 10K. The GS-45 is not a strong engine. It's good for sport planes though. You might try a 11x5 on it too. An 11x6 might be too much prop for this engine.
Bob
I know what you mean about the performance..I actually like my GS40's much better...this engine will become an experiment, when I get the replacement rod I will run the engine in, and then modify the the liner on the external surface to help air/fuel entry, I will post a thread on the so called porting mods that can be done with some basic tools. It is not really porting as I see it as I am not raising the exhaust port..basically just improving flow of gases into the cylinder..some threads have been posted recently about doing these mods..I am going to put them into real time tests and post the results
As for removing your back plate , thank you for having a look...I am thinking the same because I dont remember seeing the dimple when I first removed mine..I am pretty sure I would have noticed it then
quote:
ORIGINAL: blw
Does one end of the rod have a chamfer? That would go against the crankshaft.
I did look for that, but the rod looks identical from either side apart from the the small dimple/punch mark that's near the big end, there is no apparent chamfer on one side, the bush has a slightly bevelled edge but again identical on both sides, if I had my full internet speed I would post a photo..but my kids have used all my download up and I'm on 56k access till the end of the month...sucks 
quote:
ORIGINAL: speedster 1919
That 10x6 is the perfect prop for a ST 45 and you should get about 12-13,000 RPM. .
I get more out my GS40's ..this engine is a bit of a dissapointment as far as ABC design and displacment goes. I owned the GS 40's first, but I guess it's not designed for speed... when I'll put it togeter I'll get my degree wheel on it and check the timing specs, I expect something along the 140 -145 degress
quote:
ORIGINAL: speedster 1919
The chamfered end of rod goes to the inside of engine so it doesn't rub the radius of crank pin. Ignore the dimple because it may have been taken apart before
the rod looks identical from either side..no chamfer that is particular to one side, and this engine is a brand new one that had a big end failure due to lack of enough tolerence between piston and bore during the first break in procedure..thats why I am asking about the dimple on the rod..there is no other clue to suggest which way the rod goes...might have been able to see if the engine had more run time on it ..then I could match up the wear pattern on surfaces to determine which way the rod goes
< Message edited by HaveBlue -- 3/24/2008 1:21:47 PM >
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RE: *** CLUB SUPER TIGRE *** - 
