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mechanike



Joined: 05 Sep 2011
Posts: 13
Location: cary il

PostPosted: Mon Sep 05, 2011 9:24 am    Post subject: greetings Reply with quote

hey all!just joined.just got done putting togather an ofna lx comp(i believe)with an 2.7 o.s. supertigre and woooose!what a low end beast!the engine came with a wore 13t so it screams on take-off as well as when you let off.i found a 15t from my old Acme Conq.that somehow fit but must of been the wrong pitch or it don't like the steel spur cause the alum endbell is throwing silver everywhere!anyway thanx to motion machine displaying the right part# i ordered a 16t instead of a 18t cause you guys said it munches clutches! anyway my Actual question is,,,,,,are the f&r diffs suppost to have a quarter turn of play in them?thanx ahead of time.
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David S.



Joined: 04 Apr 2008
Posts: 422

PostPosted: Tue Sep 06, 2011 9:38 am    Post subject: Reply with quote

Welcome.

The differentials should only have a slight ammount of play, 1/4 turn is excessive. You may want to tear them down and inspect them.
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mechanike



Joined: 05 Sep 2011
Posts: 13
Location: cary il

PostPosted: Tue Sep 06, 2011 9:49 am    Post subject: Reply with quote

thanx much will do,,,,,,,,,,,
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PROMOD64



Joined: 07 Sep 2011
Posts: 11
Location: United States

PostPosted: Wed Sep 07, 2011 3:31 am    Post subject: Super Tigre Reply with quote

Which Tigre motor are you using?
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mechanike



Joined: 05 Sep 2011
Posts: 13
Location: cary il

PostPosted: Wed Sep 07, 2011 4:32 am    Post subject: Reply with quote

yeah its a g-27cx .27 supertigre i got on ebay for $50 shipped,,,,,,,,,,,thing sounds like its for a plane.
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PROMOD64



Joined: 07 Sep 2011
Posts: 11
Location: United States

PostPosted: Wed Sep 07, 2011 4:36 am    Post subject: Motor Reply with quote

It is a plane motor
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mechanike



Joined: 05 Sep 2011
Posts: 13
Location: cary il

PostPosted: Wed Sep 07, 2011 4:40 am    Post subject: Reply with quote

no wonder why it sounds that way!!! is it ok to use 30% nitro?it sure seems to enjoy it.
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PROMOD64



Joined: 07 Sep 2011
Posts: 11
Location: United States

PostPosted: Wed Sep 07, 2011 4:44 am    Post subject: Fuel... Reply with quote

I have always heard to use 20%.
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PROMOD64



Joined: 07 Sep 2011
Posts: 11
Location: United States

PostPosted: Wed Sep 07, 2011 4:46 am    Post subject: Fuel... Reply with quote

While 10% to 40% is the typical percentage of nitro in nitro fuel, you can buy fuel with as much as 60% nitro or with 0% nitro (FAI fuel). Most RC cars and trucks use 10%-40% nitro blends. RC airplanes may use lower nitro blends of 5%-10% nitro. There are also RC engines that run on regular gasoline mixed with motor oil or diesel fuel (these are engines with spark plugs rather than glow plugs) as well as jet-turbine engines that use propane or kerosene. These are specialty radio controlled models and not the kind most often sold in hobby shops.
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PROMOD64



Joined: 07 Sep 2011
Posts: 11
Location: United States

PostPosted: Wed Sep 07, 2011 4:47 am    Post subject: More full.... Reply with quote

The percentage of oil might range anywhere from 8% to 25% with 15%-20% being the typical amount of oil found in nitro fuel. There is some debate as to whether an RC aircraft that often runs at wide open throttle during most of its run needs a higher percentage of oil than an RC car that only runs at full throttle for short spurts. An RC car or truck with a hopped-up engine that does a lot of high speed racing may need a higher oil percentage than one running a stock engine and not involved in professional racing.
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PROMOD64



Joined: 07 Sep 2011
Posts: 11
Location: United States

PostPosted: Wed Sep 07, 2011 4:48 am    Post subject: More fuel stuff... Reply with quote

http://rcvehicles.about.com/od/nitro/f/nitrofuel.htm
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mechanike



Joined: 05 Sep 2011
Posts: 13
Location: cary il

PostPosted: Wed Sep 07, 2011 5:05 am    Post subject: Reply with quote

hey thanks for the link i was looking around to see if i can add alittle chainsaw oil but i'll refrain,,,,,,,,,,,,,,,
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PROMOD64



Joined: 07 Sep 2011
Posts: 11
Location: United States

PostPosted: Wed Sep 07, 2011 5:12 am    Post subject: No chainsaw Reply with quote

Good...no chainsaw oil
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mechanike



Joined: 05 Sep 2011
Posts: 13
Location: cary il

PostPosted: Wed Sep 07, 2011 8:01 am    Post subject: Reply with quote

well guys looks like the diffs are fine. all metal ring gear/pinion.inside the carrier the side gears/pinion gears no play really at all.well greased.its just the space between the dogbones! and they are true and even.when i had it in my hand and held both sides the pinon moved barely.is it the comps that have all metal gears through-out or did someone modify?
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David S.



Joined: 04 Apr 2008
Posts: 422

PostPosted: Wed Sep 07, 2011 8:46 am    Post subject: Reply with quote

The internal gears on the Ultra series differentials are all metal.
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