Arrow Racing GTR .21 Engine Thread
#541
Arrow-Racing is expanding their team for 2012. Anyone interested, please email your resume to [email protected]
Please let me know if you need any more information. Thanks
#542
Tech Adept
iTrader: (4)
Joined: Aug 2011
Posts: 239
From: Santa Cruz, CA. USA
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.
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
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.

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
#543
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.
#545
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.
#546
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.
lol. and the breakin shim
. but after breakin look out for a rocket lol
#548
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.
#550
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.
#551
Suspended
iTrader: (6)
Joined: Oct 2008
Posts: 1,368
From: PHOENIX, ARIZONA
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.







#552
#554
#555
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.

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



