Ok, I'm noob... Rich mixture... ???

[Izigoth]

Hi,

I got a HPI MT2 SS... the manual says break-in should be with a 'rich mixture' etc blahblah but... what the great HPI'ers didn't mention in their manual is how I set rich / poor mixture. They say 'turn the needle 3 turns out for factory settings'... Ok, great, but what IS 3 turns out, is that rich, ... ?

Basically I want to tune my engine good but with no one telling me how to make the difference between a rich and poor air/fuel mixture I can fiddle that needle a dozen times without still knowing what I do...

So erm... HELP! :shrug:

Thankz for all your valuable feedback for which I'm probably not worthy reading it !

Dom

 

[CorradoPsi]

turn the hsn in gently until it bottoms out, then back it out 3 full turns. factory settings are always rich. start your breakin from there using the heat cycle method.

The Bess Method


If you are still idling at least a tank through during break-in, you're using the old-school accepted method (still works well for some!) but it's not the method that the top engine guys (Ron Paris, Dennis Richey, Rody Roem, Michael Salven are just a few I've spoken personally with about this) recommend anymore.

From the very 1st time you start your engine, plop the car on the ground & begin running it in a parking lot in 2-3 minute intervals, tuned only *slightly rich* getting the temps up in the 200F range on a normal day. Every 2-3 minutes, shut the engine down & let it cool completely with the piston at BDC, and then fire it back up; continue this cycle until you've run 15 min or so, and then bump up to 3-4 minute intervals. Vary the RPM and don't be afraid to get the temps in the 200's. What you want is heat cycling of the components without the incredible stress that comes with breaking an engine in when it's overly rich & cold. After cycling the engine in this manner for about 20-25 total minutes, it'll be ready for the track and race tuning. I realize this method goes against the old-school "idle on the box" routine, but you'll be amazed once you've completed this break-in routine, your engine will still have amazing pinch w/out sticking at the top AND your engine's compression will last far longer than it will with the "old school" method.

 

[Bouzouki]

Break in at factory settings which are.

As the manual states, screw the HSN needle all the way in, then unscrew it 3 full turns.

Break the engine in with those settings with the method above.

Heat cycle it for 30 min to an hour.

After that, your all set with the break in.

You can now lean it out but remember to stay on the rich side. <270F.

A temp gun helps tunning because it tells you the engines temp.

Temp. should be 220-270F.

Anything above that can harm the engine and decress the engines life greatly.

 

[xdamxincx]

the bess method is good...