anyone else have trouble tuning there k 4.6?  
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anyone else have trouble tuning there k 4.6? - 7/11/2008 7:59:41 PM   
zsnow8x


 

Posts: 26
Joined: 7/7/2008
From: Meredith, NH, USA
Status: offline 		well i have had my 4.6 in my savage for about 2 weeks now. i have been fighting with tuning it for almost a week now. is this engine hard to tune? it seems like factory settings are sooooo far out.i have to go right to the limit the manual says to lean it out in order for my truck to even run decent!

any help is appreciated. its a k4.6 in a savage 21 frame, i have the short fuel lines to get rid of the half tank lean and i have all the savage 4.6 clutch coponents and i run 20% fuel.
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RE: anyone else have trouble tuning there k 4.6? - 7/11/2008 8:01:17 PM   
Sparco



Posts: 614
Joined: 3/8/2006
From: walnut creek, CA, USA
Status: offline 		Did you follow the break-in process? What exactly do you mean by "hard to tune"? is it bogging? not wanting to run? high rpms?

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RE: anyone else have trouble tuning there k 4.6? - 7/11/2008 8:03:36 PM   
zsnow8x


 

Posts: 26
Joined: 7/7/2008
From: Meredith, NH, USA
Status: offline 		did the whole break in. right by the book.

the truck's like stuck rich. it can't get out of its own way and just bogs until it hits a certain point it hauls the mail then once it hits the high speed needle(im guessing) it bogs again

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RE: anyone else have trouble tuning there k 4.6? - 7/11/2008 8:04:46 PM   
Sparco



Posts: 614
Joined: 3/8/2006
From: walnut creek, CA, USA
Status: offline 		So its slow from the start? try leaning the low speed half a turn.

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RE: anyone else have trouble tuning there k 4.6? - 7/11/2008 8:06:21 PM   
zsnow8x


 

Posts: 26
Joined: 7/7/2008
From: Meredith, NH, USA
Status: offline 		im right to the limit almost of what HPI says to turn the low speed needle too which is 2 turns from closed. but ill try that once i get my truck back together.

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RE: anyone else have trouble tuning there k 4.6? - 7/11/2008 8:06:38 PM   
twomanytoys


 

Posts: 4373
Joined: 1/23/2007
From: , PA, USA
Status: offline 		I found this engine really easy to tune but its still a terd. The f4.6 is wayyy better than teh k4.6. Like said above your low speed sounds super rich.

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RE: anyone else have trouble tuning there k 4.6? - 7/11/2008 8:09:39 PM   
Sparco



Posts: 614
Joined: 3/8/2006
From: walnut creek, CA, USA
Status: offline 		First off, when you get your truck back together, set the hsn and lsn back to flush. (factory settings)

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RE: anyone else have trouble tuning there k 4.6? - 7/11/2008 8:31:15 PM   
BudBud



Posts: 2709
Joined: 12/21/2006
From: Salina, KS, USA
Status: online 		I am not so sure you need to start all over from stock settings. One thing to check is that the mid needle has not backed out any, it should be flush and most of us leave it alone.. I take it that it is slow taking off. Get it running in an area that you can run wide open, warm it up and run it hard for a few minutes. It should blow smoke and obtain a high pitched sound like the K4.6 in this video. When you get that high speed rip going on, you set the low speed needle.

If it is sluggish off idle and blows a lot of smoke, it is too rich. If it bogs and has little smoke it is too lean, which is dangerous for your engine. A YouTube search for RC tuning will take you to two great tuning videos by our friends at HPI.

Always get the high speed wailing first, then set the low needle as the HSN changes the Low needle. You will soon find yourself with a pretty basic low setting and bumping your HSN back and forth for temperature and humidity changes.

If you want to be safe, turn the HSN needle richer 1/8th of turn first to see of you get less perfromance and more smoke. If you do, you are too rich.

In this video, I have an engine that is too lean on the low side. Even though it blows a huge cloud of smoke initially, as it builds heat, it has run on as the engine idles down. It was very close, I think an 1/8th is all I had to give it to get it here.

You will find that some fuels flow easier than others and you will have to go leaner than Hpi recommends to get the mixture right. It is a lot better problem to have than the other way. When they are always trying to go lean on you, someplace there is an air leak. On the Axials and Hpi K engines, it is almost always the front bearing. BB

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RE: anyone else have trouble tuning there k 4.6? - 7/11/2008 8:37:55 PM   
zsnow8x


 

Posts: 26
Joined: 7/7/2008
From: Meredith, NH, USA
Status: offline 		my truck leaves streaks on the pavement so it is definatley wayyy rich. and afer today i have one baddd air leak somewhere because all the sudden my truck got stuck on a way high idle. but i have to get it back together and ill start setting the hsn. then ill set the lsn and tell you guys what i come up with.

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RE: anyone else have trouble tuning there k 4.6? - 7/11/2008 8:46:33 PM   
BudBud



Posts: 2709
Joined: 12/21/2006
From: Salina, KS, USA
Status: online 		I did this for the Picco guys, but it applies to your engine as well. The backing plate is a great source for an air leak on these engines. The sealing process costs very little and is well worth you time, especially if you already have your truck apart......

I am not sure I ever had one leak here, but I always take the engines apart to inspect for metal machine shavings inside. Why not take a few seconds to apply a thin coat of sealer on the back of the block to eliminate that problem while we are in there?



I was going to make a video and decided to just take photos. Why after run oil? When I take the head off and clean everything up, I like to lube the piston during assembly and then put a drop on the crank pin before installing the rod, I put another drop in after installing the rod. That is all the lube it is going to get until fuel gets there. No sense starting dry. The alcohol is to clean all the surfaces.



It also takes next to no time to apply a thin coat on the carb base where it seals to the block.



When you get done, it looks like this, this one is an Orion 26, but it is Picco in every way. BB







This particular engine is a bump start Orion 26, everything is identical to the Picco. It was made by Picco.


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RE: anyone else have trouble tuning there k 4.6? - 7/12/2008 1:01:00 AM   
stussman


 

Posts: 223
Joined: 6/5/2007
From: Gold Coastqld, AUSTRALIA
Status: offline 		I had to lean both my needles way past wat the manual said for my k4.6 to run good.

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RE: anyone else have trouble tuning there k 4.6? - 7/12/2008 1:25:44 AM   
Sparco



Posts: 614
Joined: 3/8/2006
From: walnut creek, CA, USA
Status: offline
quote:

ORIGINAL: stussman

I had to lean both my needles way past wat the manual said for my k4.6 to run good.
The manual doesn't tell you how far to lean it for proper performance, thats just stupid. Temp, humidity, plug, altitude, fuel...are all variables for how needle settings. What you read might have been stock RICH settings, but not lean settings.

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RE: anyone else have trouble tuning there k 4.6? - 7/12/2008 2:11:08 AM   
zsnow8x


 

Posts: 26
Joined: 7/7/2008
From: Meredith, NH, USA
Status: offline 		the manual says to never lean the motor out more then 2 or 2.5 turns from closed ifi remember correctly

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       Post #: 13

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