SuperTigre S90K
I ran this engine a couple weeks ago and forgot to post my findings.. I haven't seen any other tach readings for this engine on this forum, and I searched all 34 some pages.
72°F air temp, 75% humidity Italian SuperTigre S90K with stock "swing" muffler, clamped the farthest away from the cylinder, and stock ST carb with flat spraybar. APC props McCoy MC59 glow plug 5% nitro 20% castor 13x6 = 12,700rpm slightly rich of peak 13x4W = 13,400rpm slightly rich of peak as well (This prop had some major balance problems, so I will retest with a different 13x4W prop) I have a mousse can for this engine that I'd like to try but need a header for it. |
RE: SuperTigre S90K
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RE: SuperTigre S90K
Macs has a header for $40.. For that price, I'm better off getting a Jettstream for twice the cost and 1/4 the work.. A bigger carb is good for a 1000rpm gain, and the exhaust could see 1000rpm gain.. I guess 15k isnt out of the ballpark for this engine on a 13x6 APC.
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RE: SuperTigre S90K
A ST 90 turning high rpm like that it will use some serious fuel. Please post your findings.
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RE: SuperTigre S90K
ORIGINAL: codycarlisle25 A ST 90 turning high rpm like that it will use some serious fuel. Please post your findings. |
RE: SuperTigre S90K
12x10 APC 12,200 on muffler with minor mods
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RE: SuperTigre S90K
I wonder if it could do that with a mousse can and a bigger carb. I've heard swapping in an ASP 108 carb is good for a 1k increase, as is a mousse can of the right size being good for another 1k gain. I have it bolted to the stand, I just have to get around to running it.
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RE: SuperTigre S90K
not sure on the OS carb. I just open up the stock carb. Some of the stock carbs can be opened up a lot others cant. If i get another one i will try another carb just to see what the carb swap will offer but to me a 1,000 seems like a very large gain but the engine is a torqer so the small carb may play in to that.
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RE: SuperTigre S90K
ORIGINAL: airraptor not sure on the OS carb. I just open up the stock carb. Some of the stock carbs can be opened up a lot others cant. If i get another one i will try another carb just to see what the carb swap will offer but to me a 1,000 seems like a very large gain but the engine is a torqer so the small carb may play in to that. |
RE: SuperTigre S90K
I will look at mine tonight I dont know which one i have. I got the engine in a large batch of engines from chip hyde. It says made in Italy. its pretty old but has great compression.
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RE: SuperTigre S90K
I went through and rebalanced all of my props, blades and hub. I decided to re-run them on the engine and see what it felt like turning today.
71°F / 42% humidity 5/20 fuel, MC59 plug, APC sport props, stock Mag V carb w/ spraybar "straight in". 12x7 - 2100 lowest idle rpm / 12,810rpm 13x6 - 1950rpm / 12,700rpm 13x7 - 2000rpm / 12,330rpm 13x8 - 1890rpm / 11,300rpm Much less vibration than the last time it ran and the throttle transition is superb. |
Added a Jettstream muffler to the S90, and new bearings. The flogging follows.
5% nitro 20% castor fuel, McCoy MC59 plug, APC props. 69*F and 64% humidity 11x8 13,800/2,500 11x9 13,650/2,500 12x6 13,900/2,250 12x7 13,300/2,200 13x6 13,300/2,200 13x7 12,600/2,200 13x8 11,800/2,200 |
Originally Posted by 1QwkSport2.5r
(Post 11595010)
Added a Jettstream muffler to the S90, and new bearings. T
13x7 12,600/2,200 What Jettstream muffler are you using? I have the red 90 size on mine. Turning the same rpm with 0 and 5 percent nitro, Thurder bolt R/C long idle bar glow plug. Engine runs extremely good. Super Tigers are excellent engines. |
Originally Posted by computermonkey
(Post 11913357)
Hello 1QwkSport2.5r,
What Jettstream muffler are you using? I have the red 90 size on mine. Turning the same rpm with 0 and 5 percent nitro. Engine runs extremely good. Super Tigers aer excellent engines. |
1 Attachment(s)
I ended up moving the spray bar down also, but haven't moved it up leaving the mid range a little on the rich side. I drilled my engine mount through added a spacer and bolted without the adapter.http://www.rcuniverse.com/forum/atta...mentid=2045567
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I won't need the spacer myself but I'll be doing the same thing. I just need to get a vice for my drill press before I drill the engine case.
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I pulled this engine out of the drawer and decided to chuck the stock ring and put the Bowman ring in it that I had. After 2 tanks of FAI fuel and 3 tanks of 5% nitro fuel, I peaked it for just a second to grab a tach reading of 14,100rpm on a 12x6 APC and red Jettstream .90 muffler. After another 5-6 tanks, I'll see where it ends up. So far it's +200rpm from the stock ring and it runs fantastic. Better than it did with the stock ring and it's not even completely broken in yet. I look forward to seeing how it runs after its more broken in.
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Originally Posted by 1QwkSport2.5r
(Post 12240800)
I pulled this engine out of the drawer and decided to chuck the stock ring and put the Bowman ring in it that I had. ....
Vbr, Richard |
Originally Posted by spaceworm
(Post 12240834)
I have a Como S90K that has great compression and runs very well, but I would like to get a Bowman ring for it for the future. Do you have a spare, or a source for same? I also have an ASP 108. I never thought of using it's carb on the Como, but I may now that I have heard of it's giving 1K more revs. Thanks.
Vbr, Richard |
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