FAQFAQ SearchSearch MemberlistMemberlist  RegisterRegister  ProfileProfile Log in to check your private messagesP.M. Log inLog in
Hyper .21 8-Port Break-In Procedure

 
Post new topic   This topic is locked: you cannot edit posts or make replies.    OFNA Nitro Talk Back Forum Forum Index -> OFNA Pit Tips
View previous topic :: View next topic  

Author Message
Rob



Joined: 12 Oct 2005
Posts: 127

PostPosted: Thu Oct 13, 2005 6:43 am    Post subject: Hyper .21 8-Port Break-In Procedure Reply with quote

Let's see, when I run in a new engine.
First I rinse out the engine case. Then install the engine in what ever chassis it's going in. I leave the plug out, fill the tank with fresh fuel and put about 15 drops of Marvel in the engine. I set the carb fully open and put a rag over the head. I then spin the engine over on the starter box till about 1/2 the tank of fuel is through the engine. Then I install the plug and close down the carb.
I fire the engine and let it fast idle for the first half tank leaning the lowend to get engine temp up to 180-200 quickly. Shut down and let cool 20 minuets. Restart and fast idle for another half tank. I might add here that when first running in a new engine I always run the tank down to half and then refill it to prevent the engine from leaning due to tank pressure drop.
After 1 full tank I drive the car around on pavement for half tank at a time and let cool 20 minuets in between. I keep engine temp in the 200-220 range. After 2 tanks of moderate throttle I run the next 3-4 tanks back and forth in straight line sprints with occassional 2 second full throttle blips.

Once thats done I tune for performance as mentioned in the Pit Tips section. This part I do on the track where rolling resistance is normal. I warm up the engine for 3-4 minuets then I start making high speed straight line passes of around 60-80 feet. I make 2 passes wide open and listen to the engine. After each 2 passes I lean the topend 1 hour, make 2 more passes and lean another hour. At some point the engine will reach a max where leaning further will only cause temps to rise with no increase in engine speed. At that point I richen the HSN back up 1/8th turn.

Then I tune the LSN. Again I warm up the engine for several minuets and then make 2-3 high speed passes. Then I stop the car and do a mental 5 count and pin the throttle. I lean the LSN 1-2 hours at a time untill the engine will set at idle after WOT for a 5 count and take sudden full throttle input without hesitation.

After all that hassle and riggamaroll I start running the car around the track as I would race it. I run 3-4 tanks in a row and monitor engine temps to make final adjustments. After a about a half gallon like this I run the snot out of it.

Note that this is how I setup and tune engines for around 95% performance. This is for flatout hardcore racing. If you are going to just be bashing around or occasssionaly club racing you probably want to run the engine a little richer on both the LSN and HSN's for longer engine life.

This is just the way I run in my engines, and since you asked, here it be.


Written by Jim Newman
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   This topic is locked: you cannot edit posts or make replies.    OFNA Nitro Talk Back Forum Forum Index -> OFNA Pit Tips All times are GMT - 9 Hours
Page 1 of 1
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
ofna nitro talk back