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Mid tank lean problem SOLVED!

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G

gnarkill

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  1. Bashing
I got tired of filling my tank every few minutes to keep from leaning me out. I used a Sullivan round style tank (product# SUL-401) and mounted that as a ballast tank. It ran great and fixed the MTL. I notched my radio box so I could fit a zip ties through. I used shoe goo to stick it onto the tvp. This cost me less than $6, so this is in my opinion is the cheapest and easiest way to solve MTL and you don't need to sacrifice tank size. Here's what it looks like:
tank.webp
 
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Lessen said:
Can you explain the theory behind why it works?
Click to expand...

Since the savage leans itself out, putting the fuel into a different tank that is always full and always has an equal amount of pressure through out the tank works better. It also keeps the fuel from moving when you crack the throttle and hit the breaks, avoiding air bubbles in the fuel line. It is like having a different tank mod (ie: new era tank mod) and having another filling that one. Fuel lines go from pipe to first tank pressure side, then first tank exit to second tank pressure side, then second tank exit side to the carb. I think that makes sense...
 
Yeah, that was a similar setup that many tried in years past. It was called the "header tank" mod. Usually an aircraft type tank mounted to the shock tower that was tubed up like yours. IMO, it was a hassle and susceptible to damage being mounted to the tower. Yours is more out of the way, so less likely to break.

Although, these days, many just run a tank different from the stock tank. I run a smaller 125cc OFNA tank on mine. Get short run times... but the tune is stable as could be.

How do you fill the header tank to the top?
 
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Nice clean job, in all my years on Savage-Central I can say no-one else has done a tank mod like that. I do know of the header tank mod Olds is referring too, I still prefer to do a midtank on a Savage for complete protection. Your mod is good for your everyday basher, but for racing it is too prone to damage from other cars. The stocker is too prone as is.
Nice work bud, you should give a part number for that tank for everyone else who may be interested.
On a side note, all you guys with extended chassis including the XL, you can make a Mugen MBX5T fuel tank fit in the stock location with a little enginuity(sp?).
 
olds97_lss said:
Yeah, that was a similar setup that many tried in years past. It was called the "header tank" mod. Usually an aircraft type tank mounted to the shock tower that was tubed up like yours. IMO, it was a hassle and susceptible to damage being mounted to the tower. Yours is more out of the way, so less likely to break.

Although, these days, many just run a tank different from the stock tank. I run a smaller 125cc OFNA tank on mine. Get short run times... but the tune is stable as could be.

How do you fill the header tank to the top?
Click to expand...

I don't let the first tank go empty so it keeps filling it. It just has a tiny air bubble at the top, where the vent line is.
 
Scrogg said:
Nice work bud, you should give a part number for that tank for everyone else who may be interested.
On a side note, all you guys with extended chassis including the XL, you can make a Mugen MBX5T fuel tank fit in the stock location with a little ingenuity.
Click to expand...

He put a part # in his original post, although, tower's search didn't find it. I found it though:
http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXFU34&P=7

Sulivan 2 oz tank.

Thanks for the tip on the MBX5T tank. Got a photo of it installed in yours?
This appears to be the tank... for $30, i may try something else. ;)
http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXRYV8&P=7
 
Just browsed the old photobucket, pics of everything I did to a Savage BUT that mod. Sorry. I used long bolts with fuel tubing over them as posts atttached to FLM servo mounts for the Savage. I don't think I even had to drill a hole in the chassis, that was the whole point. It was a rare Twisted Toys chassis and I did not want to hack on it.
 
olds97_lss said:
He put a part # in his original post, although, tower's search didn't find it. I found it though:
http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXFU34&P=7

Sulivan 2 oz tank.

Thanks for the tip on the MBX5T tank. Got a photo of it installed in yours?
This appears to be the tank... for $30, i may try something else. ;)
http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXRYV8&P=7
Click to expand...


olds did you try the tank? i had an MBX5T tank on my revo and its a really good quality tank! seems really small for a savage though..
 

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