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-   -   Arrow Racing GTR .21 Engine Thread (https://www.rctech.net/forum/offroad-nitro-engine-forum/461596-arrow-racing-gtr-21-engine-thread.html)

kman16jr 09-10-2012 07:06 PM


Originally Posted by Rsickles (Post 11196375)
Yes!

So im assuming the arrow doesnt have an oiling hole on the stock conrod?

Rsickles 09-10-2012 07:14 PM


Originally Posted by kman16jr (Post 11196383)
So im assuming the arrow doesnt have an oiling hole on the stock conrod?

They both do.

kman16jr 09-10-2012 07:16 PM


Originally Posted by Rsickles (Post 11196413)
They both do.

So is there an advantage of the xzb rod versus the stock or is it just just another alternative?

Rsickles 09-10-2012 07:21 PM


Originally Posted by kman16jr (Post 11196426)
So is there an advantage of the xzb rod versus the stock or is it just just another alternative?

Bushing is better fit and lasts much longer, IMO. That'd be the reason. The OS rod is a little lighter, but I highly doubt anyone would notice a difference.

kman16jr 09-10-2012 07:36 PM


Originally Posted by Rsickles (Post 11196446)
Bushing is better fit and lasts much longer, IMO. That'd be the reason. The OS rod is a little lighter, but I highly doubt anyone would notice a difference.

ok so the one from the new speed or the blue head xzb?

VPProUSA 09-10-2012 08:47 PM


Originally Posted by kman16jr (Post 11196506)
ok so the one from the new speed or the blue head xzb?

They are all the same.

kman16jr 09-10-2012 08:50 PM


Originally Posted by VPProUSA (Post 11196776)
They are all the same.

Ok thanks gene,i might be getting the arrow and the 2060 pipe,also the 4shoe clutch and possibly a different rod depending on how long the stock one lasts.Once i get rid of the few cars i dont use its on:nod:

Danny Teh 10-01-2012 03:24 AM

Just finish our yesterday nationals.

The Arrow V3 ran awesome.....2060 & 7 mm venturi did the trick......11 mins runtime. No refuel in 10 mins qualifying.
:D

q8hobbyman 10-07-2012 09:41 AM

good run danny teh :)

Danny Teh 10-07-2012 11:00 PM

1 Attachment(s)

good run danny teh
Yes......the motor is consistent.......
Some dude put a complete p/s/l into a Ninja B01 and it went even faster.

I have no idea though.......will pop in a crank shaft B01 since i got one.
And see if it is better...........

DT

---------------------------------------------

New Arrow Heatsink..........it is stronger now.......
It is good to see.......the manufacturer respond quickly to request.....

Thumbs up !

VPProUSA 10-08-2012 10:13 AM


Originally Posted by Danny Teh (Post 11298858)
Yes......the motor is consistent.......
Some dude put a complete p/s/l into a Ninja B01 and it went even faster.

I have no idea though.......will pop in a crank shaft B01 since i got one.
And see if it is better...........

DT

---------------------------------------------

New Arrow Heatsink..........it is stronger now.......
It is good to see.......the manufacturer respond quickly to request.....

Thumbs up !

The VZB Speed crankshaft gives more bottom end to the GTR-21. The Ninja crank gives even more all around power - perfect for truggy. :nod:

Danny Teh 10-09-2012 12:25 AM


The VZB Speed crankshaft gives more bottom end to the GTR-21. The Ninja crank gives even more all around power - perfect for truggy.
Thanks......Gene......:D

Great tip........I might run the Ninja shaft on super size track.............the GTR shaft on track which have plenty of jump.......:nod:

DT

gio2174 10-09-2012 02:29 PM

Arrow
 

Originally Posted by 22Racer (Post 11117173)
Race tune for Arrow engine

To all Arrow Engine users. Here is the tuning which we found to be close to what you might need.

Low Speed Needle: From Flush >> 1/2 Turn in.
Mid Speed Needle: From Flush >> 1 1/2 Turn Out.
High Speed Needle: From Flush >> 1 3/4 Turn in.


I tried these settings Danny posted a link to, ran awesome.

Rex

Really glad I read your post. I started the break in on the box and then on the ground running in a few figure of eights. The problem was that if kept on cutting.
Started with flush needles at 2 o'clock and it kept on cutting. Thought it was to rich and started to lean the high and low needles, but still cut. Tried a nova carb, but still the same. I then read your post about the mid needle setting and put it
1 1/2 out from flush. I set the high and low needles to your settings also. All I can say is what a difference. Very strong performance, good temps and no cuts.

Has anyone else tried this on the mid needle? Most people say flush 2 o'clock, but this did not work for me.

22Racer 10-09-2012 03:07 PM


Originally Posted by gio2174 (Post 11305656)
Really glad I read your post. I started the break in on the box and then on the ground running in a few figure of eights. The problem was that if kept on cutting.
Started with flush needles at 2 o'clock and it kept on cutting. Thought it was to rich and started to lean the high and low needles, but still cut. Tried a nova carb, but still the same. I then read your post about the mid needle setting and put it
1 1/2 out from flush. I set the high and low needles to your settings also. All I can say is what a difference. Very strong performance, good temps and no cuts.

Has anyone else tried this on the mid needle? Most people say flush 2 o'clock, but this did not work for me.

With some other brand motors I set the idle gap at .7mm. When I run it and set the lsn fairly lean to get a good idle it cuts out in the mid range. What happens is with the long lsn it is reducing fuel in the mid range also. The mid needle adjustment is just backing off the spraybar the fuel comes out.

Rex

VPProUSA 10-11-2012 08:55 PM

Heading to the track in the morning to break in my V3.

I took the carb apart and looked at all the neddles. I am starting with this:
Idle gap - .6mm
High - 2.5 out
Low - 1 turn in at noon
Mid - 2 turn out from flush at 2 o'clock

That looks like the best settings to me. I will report my results Mon.


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