bonbon Posted April 27, 2008 Report Posted April 27, 2008 Well my banshee was spitting coolant every now and then yesterday, I thought it may have been overheating. Well I checked my impeller and it was in good shape but I was slowly losing coolant even if it wasn't spitting out the overflow tube a little. Here is what I saw when I pulled my topend off a little bit ago. So apparently my o-ring broke. Now, would burning a little coolant cause those pits in the domes? The right side looks cherry, this is only on the left. And once when I checked my coolant yesterday, it was frothy in the radiator which makes me think it was getting slightly pressurized from the broken o-ring. Anybody have some input? Quote
theshee Posted April 27, 2008 Report Posted April 27, 2008 Couple things.. A little coolant shouldnt do that to the dome, looks like something has gone through there, what the top of the piston look like.. second- is that a majic coolhead? If so you are dicked on 0-rings, prr design ones dont fit right... At least they didnt in the one I had, hence why it got sold. Quote
bonbon Posted April 27, 2008 Author Report Posted April 27, 2008 Couple things.. A little coolant shouldnt do that to the dome, looks like something has gone through there, what the top of the piston look like.. second- is that a majic coolhead? If so you are dicked on 0-rings, prr design ones dont fit right... At least they didnt in the one I had, hence why it got sold. Yeah I think I know why the dome looks like that. I cut some corners last time I melted it down, last 4th of July. I didn't split the cases to clean it all out, just flushed it out like 20 times with some mixed gas and then oiled it all up really good. Everything was real smooth (bearing wise) and its been running great. I've found the o-rings will work except for the huge one around the outside to hold the coolant in (just been reusing that one). Thats why I cheat and use a little silicone on there too. Quote
ABL Posted April 28, 2008 Report Posted April 28, 2008 That suxx about your shee going down, but corner cutting only hurts yourself. That silicone as a gasket is not good. Hindsight is always 20/20... Quote
bonbon Posted April 28, 2008 Author Report Posted April 28, 2008 That suxx about your shee going down, but corner cutting only hurts yourself. That silicone as a gasket is not good. Hindsight is always 20/20... The silicon was just to hold in the o rings because I had no grease handy. And the only one that would even need it a little bit is the big one that just holds the coolant in the head, not from going in the domes or anything major. It was not leaking at all the whole time. Just that oring on the dome split and let coolant in and might have been trying to pressurize the cooling system a little and was forcing it out my overflow. Quote
ABL Posted April 28, 2008 Report Posted April 28, 2008 alright, that helps a lot! Not jabbing your skills or anything! Quote
bonbon Posted April 28, 2008 Author Report Posted April 28, 2008 alright, that helps a lot! Not jabbing your skills or anything! No problem man, I've been known to cut a few corners but I usually know that by doing it I'm running the risk of breaking something. Like the pits in the domes. Probably from sand. Well my pods aren't in the best of shape and just the other day my outerwear on the left filter decided to hit my pipes and get some nice holes burned in ut. I kinda ghetto taped it together and went out. Most likely get some sand that way and it was only the left cylinder so I'm sure thats it. Quote
gregrob Posted April 29, 2008 Report Posted April 29, 2008 (edited) And I helped you ghetto tape it together!!!! Maybe you got the wrong kind of panty hose lmao!!!! Sounds like your gonna get her back together and going strong again Jon. I will have an extra set of domes if you need them soon. They're 19cc, let me know.... Edited April 29, 2008 by gregrob Quote
BigRed350x Posted April 29, 2008 Report Posted April 29, 2008 Jon... those nasty pits in the domes are from detonation. Whats your timing at? I know we checked your compression when we put it together, but you might check it again after you re-build it this time, and might consider either backing your timing down or mixing with some racegas from that place down the street from you.... I wouldn't try and repair those domes. I know you don't want to hear that and will probably do it anyway, because your a sasquatch. But if you just try and sand them down and re-run them you will have some nasty hot spots that form inside the cylinder and will cause irregular burning in the cylinder and although you probably wont feel it, you will have some power loss as a result. It will also weaken your domes, which can cause a problem like you saw mine have this past weekend. haha! If you want to do it the easy, correct way, run down to PRS Machine there in rock springs, down past home-depot and ask Larry (big guy in front office) if you can use his little tiny blue electric lathe and just clamp your dome in there and hold some of his rough emory cloth on it, spinning like 15,000k rpm and it will smooth it out evenly around the dome. Tell him Jared sent you there and he will probably just let you do it yourself, or at least help you out with it. Hit him up around 5:30 and he will probably just let you do it yourself. Ask for Dustin or Jon to help you and they will know what I'm talking about, they saw me do it a couple times. But I would just order new domes and keep those as a spare in your growing parts bucket.... haha - Jared Quote
BigRed350x Posted April 29, 2008 Report Posted April 29, 2008 Yeah, that's definitely not from sand getting into your cylinders. Detonation creates thousands of pounds of pressure for a fraction of a second on every stroke and it starts to put little micro dents in the domes and eventually they grow into those little dings and worm looking shapes from the heat and pressure it creates every time it detonates. Go hit up planetsand and read up a little bit on some of their threads about detonation and they explain it in a lot more detail. You and I have seen what sand does to your engine from that time i blasted your bike with sand so hard it went through your pods. (That uhh... my bad.) It would kill your rings and you'd lose compression and trash your bearings long before the sand would have enough time to bash those little dings into your domes. - Jared Quote
dajogejr Posted April 30, 2008 Report Posted April 30, 2008 Somebody can machine those domes, you might require a thinner base gasket depending on how much they have to take off to get it to squish out right. How much compression and what timing are you running?? Quote
bonbon Posted May 6, 2008 Author Report Posted May 6, 2008 what domes are u running ?? They are 20cc big bore domes. Somebody can machine those domes, you might require a thinner base gasket depending on how much they have to take off to get it to squish out right. How much compression and what timing are you running?? If I remember my compression was right around 130-135. My timing is set at +4. I don't know if I got some bad gas or what the hell was going on there. I just doesn't seem like it should be detonating to me. Any other ideas? Quote
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