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Old 12-15-2003, 06:33 AM   #1
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Default OS engines thread

Discuss OS engines here.

http://www.osengines.com/
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Old 12-17-2003, 06:06 PM   #2
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Anyone else here mod their OS's too? What mods have you guys done?
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Old 12-17-2003, 06:34 PM   #3
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Quote:
Originally posted by WheelNut
Anyone else here mod their OS's too? What mods have you guys done?
Changed timing on induction, exhaust and transfer. Relaped sleeve for bigger tapering on the bottom. Partly redirected flow on transfer ports, decreased crancase volume approx. by 10 %. Works great.
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Old 12-17-2003, 08:48 PM   #4
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Quote:
Originally posted by Top Gun 777
Changed timing on induction, exhaust and transfer.
Any numbers to go by?
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Old 12-17-2003, 08:51 PM   #5
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I just got myself a Mspeed TR 5+2, will be running it soon, will keep you guys posted on the performance.
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Old 12-17-2003, 08:55 PM   #6
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Quote:
Originally posted by Joehwee
I just got myself a Mspeed TR 5+2, will be running it soon, will keep you guys posted on the performance.
That must have costed you a bomb, Joe. How much did it set you back?

I'm told that the Kondo OS is a better engine than the MSpeed version...
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Old 12-17-2003, 09:03 PM   #7
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Quote:
Originally posted by InitialD

I'm told that the Kondo OS is a better engine than the MSpeed version...

Kondo?never heard of it.
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Old 12-17-2003, 10:00 PM   #8
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i heard Zac Modified OS TR5 porter is fast as well??
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Old 12-17-2003, 10:04 PM   #9
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Quote:
Originally posted by CyrilJ88
Kondo?never heard of it.
In Japan, they are very famous. Look at the Japanese RC World magazines.
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Old 12-17-2003, 10:06 PM   #10
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Quote:
Originally posted by alana07
i heard Zac Modified OS TR5 porter is fast as well??
Zac Modified? Never heard of it ! (j/k)

Anyway, has anybody tried the Zac or seen one on the track? Better still, has anyone seen or tried all three different OS varients i.e. MSpeed, Kondo and Zac?
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Old 12-18-2003, 01:01 AM   #11
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All the engine should be fast at that kind of prices, but I think Mspeed is a better buy, the reasons being;

Kondo - Modified engine out of the box, most work are done on the P&S and Crankshaft, minor work on the backplate, carb and conrod.

Zac/Kawahara - Not too sure who mod it, heard it was Kondo too, if that's true most of the work done should be simillar.

Mspeed - P&S are match before modification, mod are done on the P&S, Crankshaft, Crankcase, conrod and Carb. Backplate is also specially designed to increase flow and internal pressure. Crankcase is treated to increase strength and for better heat dissipation. Hestsink fin is machined on the button to improve heat dissipation. The heatsink is also replace with 7075 machined unit and is very light for low CG. Re-alignment of bearings in the crankcase.

But of cos the extra work done by Mspeed cannot guarantee better perfomance as they maybe for look only.

They are also other company doing modification in Japan such as NEXT and T-Force. However as far as I know ZAC TR and MT12 and T-force only have modified OS TR
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Old 12-18-2003, 01:03 AM   #12
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However I have put one of those Kondo engine on my wish list, may buy one next year if my racing budget allow.
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Old 12-18-2003, 08:19 AM   #13
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Quote:
Originally posted by InitialD
Any numbers to go by?
Sure, no secrets! Exhaust 166, transfer 126, induction 210 (sorry will not say when it open and close). Tapering .11 mm on sleeve lenght ( three tappers). Anything else I can give?
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Old 12-18-2003, 09:10 AM   #14
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Quote:
Originally posted by Top Gun 777
Anything else I can give?
Yep,just pack it up nicely in its box and send it my way for tests ASAP !
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Old 12-18-2003, 09:13 AM   #15
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Quote:
Originally posted by EVOLUTION
Yep,just pack it up nicely in its box and send it my way for tests ASAP !
Man, I would love to, but it isn't mine property and already out of my posetion!
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