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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)

Sein 03-07-2012 08:29 AM


Originally Posted by Hobby Pro USA (Post 10422306)
Arrow-Racing is expanding their team for 2012. Anyone interested, please email your resume to [email protected]

I emailed my resume last night.:nod: Please let me know if you need any more information. Thanks

Crash Test Dumy 03-08-2012 07:00 PM

Got Mine!
 
Hey guys,

The motor looks great, Thank You James! I can't wait to break her in. I have a question about break-in fuel. Can I make some by adding oil to my existing fuel?
Also, I have never heard of breaking in an engine upside down! I mean it makes sense, keeping the fuel/lube towards the top end.
Anyone done this?
I'll have to make an upside down break-in bench.:p
Can someone recommend a prop size for breaking in on a bench? I think all the props I have are for a bigger shaft. I'll have to check.
Any thing different about breaking in on a bench as compared to in a car and on the track?

Thanks
Brian

Jaz240 03-08-2012 07:28 PM

Gotta love priority mail! Glad you are happy Brian. "Upside down" is a little extream if you ask me. I know the theory behind it but have yet to hear about anyone actually doing it. Go get yourself a gallon of fuel with 16% oil and you should be fine breaking it in on the bench or in the car. I think the biggest issue with break in is people using their racing fuel with 9% oil or even worse 9% synthetic only. You want a fuel with castor and synthetic oil and bare minumum of 11% total oil content. You will never hurt your engine with to much oil in your fuel, just be careful about overheating without moving parts because some heavy Castor oils can turn into glue when they get hot and then you have to take apart the engine and "de-gunk" it.

stallen50 03-08-2012 08:10 PM

Just run werks 30% and forget about using two different fuels. one for breakin and one to run. for get that. i breakin my motors with fuel i race with. and always have. use the breakin shim. thats my opinion

Jaz240 03-08-2012 09:24 PM


Originally Posted by stallen50 (Post 10442252)
Just run werks 30% and forget about using two different fuels. one for breakin and one to run. for get that. i breakin my motors with fuel i race with. and always have. use the breakin shim. thats my opinion

It works but you definately sacrifice engine life. For the price of this engine there are allot of people who don't seam to care, there are also allot of people who follow your same method but with an engine this tight it is good to have more lubrication. There are also some fuels that will ruin your engine in a hurry if you use them for break in fuel.

stallen50 03-08-2012 10:02 PM


Originally Posted by Jaz240 (Post 10442569)
It works but you definately sacrifice engine life. For the price of this engine there are allot of people who don't seam to care, there are also allot of people who follow your same method but with an engine this tight it is good to have more lubrication. There are also some fuels that will ruin your engine in a hurry if you use them for break in fuel.

buddy i am not knocking your method. this is what i do. and with this motor heat is your friend:flaming: lol. and the breakin shim:p. but after breakin look out for a rocket lol

So*Cal AFDude 03-08-2012 10:11 PM

Just removed my break in shim.. Let's see what this bad boy does now :D

Jaz240 03-08-2012 10:20 PM


Originally Posted by stallen50 (Post 10442695)
buddy i am not knocking your method. this is what i do. and with this motor heat is your friend:flaming: lol. and the breakin shim:p. but after breakin look out for a rocket lol

I'm not knocking your method either. Apologies if it sounded that way. I just didn't want someone trying to break this engine in with fuel that has 7% oil and then the engine is shot after 2 gallons and they go saying the engine is junk. It happens more often than not unfortunately.

pcage 03-08-2012 10:21 PM

my engine runs great. no flame out. temperature is good. but after a couple of hard laps, the engine comes into the pits with high idle before it drops back to normal. how do I get this right ?

Jaz240 03-08-2012 10:27 PM

Engine run on can be a too rich or too lean LSN. If its too rich the engine will load up with excess fuel that will burn off when it sits at idle. Too lean and it may machine gun as it starves for fuel. There is a fine line between your idle gap and your LSN tune. Check idle first and then tune your LSN till the engine idles low and steady without that up and down effect. Run a few laps first to get everything heat soaked before tuning.

Vareck 03-09-2012 02:08 AM


Originally Posted by Jaz240 (Post 10442745)
Engine run on can be a too rich or too lean LSN. If its too rich the engine will load up with excess fuel that will burn off when it sits at idle. Too lean and it may machine gun as it starves for fuel. There is a fine line between your idle gap and your LSN tune. Check idle first and then tune your LSN till the engine idles low and steady without that up and down effect. Run a few laps first to get everything heat soaked before tuning.

PLEASE STOP giving advice on tuning James you Can't even Tune your own Engine. OR at least make a Video of all of your Advice and Help so EVERYONE can SEE!!!!!:lol::lol::lol::lol::lol::lol::lol::lol:

houston 03-09-2012 06:15 AM


Originally Posted by Vareck (Post 10443015)
PLEASE STOP giving advice on tuning James you Can't even Tune your own Engine. OR at least make a Video of all of your Advice and Help so EVERYONE can SEE!!!!!:lol::lol::lol::lol::lol::lol::lol::lol:

I think I just busted a gut! :lol:
U boys r silly! :nod:

Tuning is an art ;)

pcage 03-09-2012 07:11 AM

Vareck & houston,

Any advice where I go wrong ?

Jaz240 03-09-2012 07:15 AM


Originally Posted by Vareck (Post 10443015)
PLEASE STOP giving advice on tuning James you Can't even Tune your own Engine. OR at least make a Video of all of your Advice and Help so EVERYONE can SEE!!!!!:lol::lol::lol::lol::lol::lol::lol::lol:

Crawl back under your rock Crum

houston 03-09-2012 07:19 AM


Originally Posted by Jaz240 (Post 10442720)
I'm not knocking your method either. Apologies if it sounded that way. I just didn't want someone trying to break this engine in with fuel that has 7% oil and then the engine is shot after 2 gallons and they go saying the engine is junk. It happens more often than not unfortunately.

this is absolutely true :nod:

wasnt knockin ya James but knowing you and Vareck and your relationship or lack of :lol: it was funny in context :nod:


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