Fuel pump

[bryan1984]

Anyone ever tried using one of these?

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXDG59&P=7

I was looking around for a possible electric pump to experiment with and found this. Not to wild about drilling a hole in the block but I guess if done correctly and it works then it would be ok? trying to keep my tune a little more stable. have about a 30 to 40 degree temp gain from full to empty which also seems to really depend on what pipe I have on the engine.

 

[olds97_lss]

I know it had been tried before and the RPM's that these 2 cycle engines run is too much for one of those pumps to deal with. They work ok with 4 cycle engines (I think it's a requirement with those) but they run much lower RPM's and give more torque.

If it's a savage... your best option is finding a tank that isn't shaped like an L from top to bottom. I run a sad little 125cc tank on my savage. My LRP drains it pretty quick, 6-7 minutes or around there. I tried a couple other tanks on it, but ended up going back to the old OFNA tank. sadly, they don't make it anymore so recently I found another OFNA tank, but it's also 125cc. I haven't mounted it up yet, but mines spring/seals are getting old, so wanted to have something on hand for when it starts leaking on me.

 

[bryan1984]

Ok, it says its made for 2 stroke engines. I think mainly used in helis and planes. I am completely ignorant to the flying rc's but don't they use the same or very similar engines as we do with the trucks?

 

[Jam Racing 1]

Actually there are quite a few differences between surface rc and flying stuff...... that aside those perry pumps have been tried before without much success.....

 

[olds97_lss]

Ok, it says its made for 2 stroke engines. I think mainly used in helis and planes. I am completely ignorant to the flying rc's but don't they use the same or very similar engines as we do with the trucks?

They may be 2 stroke, but still run lower RPM's. The handful of 2 cycle .15-.75 plane engines I looked at were all under 20K rpms.

 

[X]

I run a sad little 125cc tank on my savage. My LRP drains it pretty quick, 6-7 minutes or around there. I tried a couple other tanks on it, but ended up going back to the old OFNA tank. sadly, they don't make it anymore so recently I found another OFNA tank, but it's also 125cc. I haven't mounted it up yet, but mines spring/seals are getting old, so wanted to have something on hand for when it starts leaking on me.

I run the same tank. Just shows how long we've had Savages...... Mine is mounted up with the New Era solid mount, was pretty popular years ago.

 

[francis Labarbara]

I lowered the stock tank in the chassis and don't fill it above the fuel inlet on the carb. If you do it will siphon gas until it gets down to that level and run completely differently.

 

[bryan1984]

Well had something kind of odd last night. I was breaking in my LRP 30X in my savage XL. Working on the 3rd tank. I installed a header tank on rear shock tower of the XL when I put the engine in. Never had one with a header tank but figured I would try it being my other XL with the 5.9 hpi in it suffers horrible from MTL. Idling it was fine, quite rich. idled for 2 tanks then went into the half throttle break-in. Coming off idle very rich but after about 30 seconds or less off idle(at 1/4 to half throttle) the smoke was gone. I stopped it and checked temp and it was at 260. I richened the HSN 1/4 turn, same result but really fat at idle. went another 1/4 same result, went another 1/4. was so fat it wouldn't run with out the glow igniter and would barely start. I started at factory specs on the LSN and HSN also. So I went back to factory specs and unhooked the header tank. Went strait from the oem savage tank to carb. Fixed the problem. At factory specs it was at 205 after 2 min of running at 1/4 to 1/2 throttle and smoked the whole time like it should. WTH is up with that? The header tank is a hays 2 oz with clunk and it doesn't have any air leaks.

I didn't really think the header tank would 100% fix the HTL lean issue but thought I would give it a try being some have had good success with it. So far it has made it 100% worse even when the tank is full.