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HelicopterEngines Plugs Mufflers Fuel › Nitro Performance RC
11-22-2009 10:30 PM  8 years agoPost 1
Ghostrider

rrElite Veteran

San Diego, CA

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Well guys, I got my YS SR back from Mark at Nitro Performance RC, the new horse power advertiser here on the RR main page. Please note I am not a sponsored pilot and have zero connection with NPRC. This is simply my results thus far.

This particular motor had over 1500 flights on it but now is brand new on the inside with the exception of the crankshaft. I sent Mark a new piston, liner, ring, connecting rod, wristpin, bearings etc which he installed for me.

Saturday morning, day one testing. 1st two flights were done at break in needle settings simply hovering around. Next two flights I started to lean the needles. Mark says the optimum temperature should be between 130 and 150 on the head based on how hard you can push the helicopter or heat up the motor. All the temperature temping was done as close to the glow plug as possible on the head.

By the end of the 4th and final flight on Saturday, the motor was still ice cold to the touch and temps were reading around 75F on the head. At this slobbery rich setting, (smoking out the pits) the motor was almost on par with my twin T700 with a bone stock 91SR. Needless to say, it was hard to wipe the smile off my face.

Back at it today (Sunday), I put another three flights on the motor while continuing to lean and temp. By the end of the third flight, I was getting 115F on the head and the power was absolutely stupid crazy. If you have ever witnessed Tim Jones fly his beast electric E700, my SR was approaching that level. For the first time in a couple of years, I was getting the adrenalin shakes. Keep in mind; I am still a good 15 -30 degrees rich according to the recommended temps at NPRC. At these ridiculously cold engine temperatures, the above average pilot would be ecstatic with the power. I unfortunately did not have the time to get the motor completely tuned today but so far, the only word to describe this upgrade is wicked!

Next weekend I expect to get to optimum settings but right now, I am not sure if any more is necessary. I am now starting to consider a heavier blade (currently running 710 SB’s) and possibly dialing down the pitch. At optimum temps, I am wondering if it simply may be too much power.

More to come later…..

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11-22-2009 11:04 PM  8 years agoPost 2
jake26

rrApprentice

central cali

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Wow sounds impressive. I'm surprised he's having you check temps near the glow plug. I'm curious if the temps would be that low down near the top of the cylinder too? What head speed are you running that thing at sam?

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11-22-2009 11:11 PM  8 years agoPost 3
Ghostrider

rrElite Veteran

San Diego, CA

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Head speed was at 1940 using a Multi-gov pro. Temps at the top of the case below the head on the exhaust port side were around 150. Ice cold!

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11-22-2009 11:49 PM  8 years agoPost 4
Nitro Performance RC

rrNovice

toms river nj

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Sam im happy you like the motor now man up and run it a 140f. just joking As to the head temp I ask everyone that buys one of my engines to temp it on the head. It is the most accurate way to see what is going on in the engine. The explosion happens right under the glow plug and that's what causes an engine to get hot. That's just my opinion and it has worked for me.

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11-23-2009 12:01 AM  8 years agoPost 5
Ironhide

rrVeteran

dexter mi us

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Lets see inside !

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11-23-2009 12:31 AM  8 years agoPost 6
jake26

rrApprentice

central cali

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So is this the 95 or is it still a 91? On the 95 do you put in a ST piston? or is it a OS piston?

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11-23-2009 12:43 AM  8 years agoPost 7
Ghostrider

rrElite Veteran

San Diego, CA

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This is the 91 with stock parts.

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11-23-2009 01:28 AM  8 years agoPost 8
Nitro Performance RC

rrNovice

toms river nj

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I had them made. I was thinking about the ys st but there arent enough of them. And the cost is the same

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11-23-2009 01:34 AM  8 years agoPost 9
JJMAN (RIP)

rrVeteran

Chesapeake, Virginia​- USA

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How are you able to get such cold temperature on the head after a complete tank?

JAY HIGGS

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11-23-2009 03:50 PM  8 years agoPost 10
Ghostrider

rrElite Veteran

San Diego, CA

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How are you able to get such cold temperature on the head after a complete tank?
I am not sure how it works but that is one of the best parts of this mod. It allows you to run your engine cooler with much more performance.

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11-23-2009 05:55 PM  8 years agoPost 11
EricBrandenburg

rrApprentice

Milwaukee,WI

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Just got off the phone with Mark, very nice guy and very smart. Looking forward to seeing more reviews of these mods soon. One of you guys with Mark's engines should post up some video of them in action. I think I need some big bore YS'.
Eric

Spending money I don't have on things I don't need to impress people I don't know

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11-23-2009 06:41 PM  8 years agoPost 12
Jag72

rrProfessor

South of Boston

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motor

This particular motor had over 1500 flights on it but now is brand new on the inside with the exception of the crankshaft. I sent Mark a new piston, liner, ring, connecting rod, wristpin, bearings etc which he installed for me.
HOLY CRAP!

1500 flights? what's that ...like 150 gallons

I don't think I have logged 1500 flights in the past 4 years...man...I guess I don't fly NEARLY enough...lol..

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11-23-2009 06:46 PM  8 years agoPost 13
Terrabit

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Seattle, WA - USA

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I think I managed to squeek out around 400 last season. That's my6 personal best. I'm jealous!

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11-23-2009 08:17 PM  8 years agoPost 14
Ghostrider

rrElite Veteran

San Diego, CA

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I think I managed to squeek out around 400 last season. That's my6 personal best. I'm jealous!
I get about 10-15 flights per week multiplied by 4 weeks then multiplied by 12 months. 1000+ flights per year is easy. Remember guys, I live in beautiful San Diego, I get to fly year round.

This particular motor is my oldest SR. It was in my Stratus, then Aurora, and now in my 700. It's now my go to motor.

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11-23-2009 08:45 PM  8 years agoPost 15
Nitro Performance RC

rrNovice

toms river nj

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LOL like a fine wine it only gets better with age
With a little help

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11-23-2009 08:52 PM  8 years agoPost 16
Jag72

rrProfessor

South of Boston

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1000 flights+

if you divide 1000 by 52 weeks that's roughly 20 flights a week you have to get.

That's a LOT of flying...of course most of us are just plain jealous that we don't get enough good weather to support that much flying.

living up here in the Northeast (Boston) I'm lucky if I get 300-400 flights a year...

I myself find that I get bored with a machine after about 50 flights...lol..

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11-25-2009 07:22 AM  8 years agoPost 17
brcg123

rrKey Veteran

Wagoner OK USA

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You should have just replaced the stuff yourself, and saved the money you spent for the rebuild. I dont think you really would tell the difference in power. If you put a new piston and ring in a used case, you pretty much have a new motor, dont you? Not really knocking the procedure, just think its not worth what your getting in return. For what you have spent to get to where your at with it, I dont believe your ahead in the game. First you have to invest in the original engine, around 350.00 then, you have to purchase all of the replacement parts, that will be installed, another 150.00. then the procedure will be what? 125.00 or so? pretty pricey, if you ask me. Why not buy a brand new engine?








Trex700N, Trex600N, Raptor70, RaptorTitan, GMPCrickett, Visa

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11-25-2009 07:37 AM  8 years agoPost 18
Riq

rrKey Veteran

ND

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He stated that running dripping rich it was on par with a 91sr.

Why dont people read b4 commenting........This is his business at stake...

I run big 2 strokes in some big outdoor apps,(mtn sleds, mx, etc) and there isnt anything that porting and balancing doesn't add power to....so I dont understand why a lot of people are giving him a hard time?!?!

Just to prove I believe, im going to send a 91st to see what happens.....lets get in contact tomorrow......

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11-25-2009 12:03 PM  8 years agoPost 19
Ghostrider

rrElite Veteran

San Diego, CA

My Posts: All  Forum  Topic

brcg123

You should have just replaced the stuff yourself, and saved the money you spent for the rebuild. I dont think you really would tell the difference in power.
The power is stupid different from a stock motor. Read above!
Not really knocking the procedure, just think its not worth what your getting in return.
It may not be worth it to you but going from a Ford to a Farrari for less than a $100 including shipping to and from....it's definately worth it for me.
For what you have spent to get to where your at with it, I dont believe your ahead in the game.
Nobody is trying to get ahead here, were talking about performance. Please understand performance and upgrades do not belong in the same sentence as getting ahead here. When I need a few engine hop ups for my Dodge Magnum SRT, I don't shop at Walmart.
First you have to invest in the original engine, around 350.00 then, you have to purchase all of the replacement parts, that will be installed, another 150.00.
Original engine is about 2 years old, mute point.

New engine $350 vs old engine rebuild $150. Rebuild and save $200.00

Engine hop up is less than $100 so Engine re-build $150+100 for hop up = $250.00

Two year old Farrari Enzo for $250 or a brand new Ford Fucus for $350 Who is ahead of the game now?

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11-25-2009 12:16 PM  8 years agoPost 20
Turkana

rrKey Veteran

Montreal,Quebec ,​Canada

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Normaly People give out such comments because they absolutly have no idea about engine tuneing or espacialy about 2 stroke tuneing.Changing ring and bearings is not what it is about and if you know anything about engines and have a look at an O.S Hyper you can see that performance can be gained. But people think because it has written O.S all over it it already musst be running at peak performance LOL!And yes bevor blowing out another 450 $ for new Pipes and Motor I will send Nitro Performance my Motor, becasue for that price it seems quite resonable.
People spend stupid amounts on the newest brushless servos and other gadgets, but here is somebody who actually is using his brain and building something for you for a very resonable price.You dont pay Nitro Performance for the labour , you actually pay them for finding out and knowing what they have to do. Becasue belive me you will be going through a couple of engines bevor you know were to remove how much material and that also cost alot of labour and money.

Regards Pete

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