o.s. o.b. piston & sleeve
02-12-2007, 05:30 PM
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o.s. o.b. piston & sleeve
broke in w/ 60 % , 2.5 turns out on h.s. needle per inst. no water restriction. running cold. ran 6 tanks through it. started leaning needle. ended up @ 1.5. running strong. soldered up water outlet nipple , & drilled out to .050. after 4 wot laps , only warm to the touch. removed cooling line , & ran 3 wot laps. water sizzled on head & melted out solder! took off head & button. piston has no pinch at t.d.c. anymore.wore out piston due to cold break in ? is 2.5 too rich for break in?
02-12-2007, 08:22 PM
#3
RE: o.s. o.b. piston & sleeve
The higher the nitro, the richer that the carb has to be. Needle recommendations from any manufacturer are only starting points as there are a lot of factors that come into play depending on where you live, the weather and altitude.
With 60% nitro, you might have cooked the piston and/or sleeve. Pull them out and see how they look.
With 60% nitro, you might have cooked the piston and/or sleeve. Pull them out and see how they look.
02-12-2007, 08:24 PM
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RE: o.s. o.b. piston & sleeve
because i restricted the water outlet to .050 w/o hardly any affect. i read where some guys have the lines removed to get the temp. up. so i tried it. NOOO!!! carter
02-12-2007, 08:29 PM
#5
RE: o.s. o.b. piston & sleeve
You're in California where it doesn't get as cold as where it does like where I live. Want some 26 degree weather?
If you got it hot enough to melt the solder, you probably got it too hot.
The K&B SS OB engine is air-cooled but you have to run it slobbering rich as the fuel and oil help to keep the engine cool.
If you got it hot enough to melt the solder, you probably got it too hot.
The K&B SS OB engine is air-cooled but you have to run it slobbering rich as the fuel and oil help to keep the engine cool.
02-12-2007, 08:31 PM
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RE: o.s. o.b. piston & sleeve
ORIGINAL: kb guy
broke in w/ 60 % , 2.5 turns out on h.s. needle per inst. no water restriction. running cold. ran 6 tanks through it. started leaning needle. ended up @ 1.5. running strong. soldered up water outlet nipple , & drilled out to .050. after 4 wot laps , only warm to the touch. removed cooling line , & ran 3 wot laps. water sizzled on head & melted out solder! took off head & button. piston has no pinch at t.d.c. anymore.wore out piston due to cold break in ? is 2.5 too rich for break in?
broke in w/ 60 % , 2.5 turns out on h.s. needle per inst. no water restriction. running cold. ran 6 tanks through it. started leaning needle. ended up @ 1.5. running strong. soldered up water outlet nipple , & drilled out to .050. after 4 wot laps , only warm to the touch. removed cooling line , & ran 3 wot laps. water sizzled on head & melted out solder! took off head & button. piston has no pinch at t.d.c. anymore.wore out piston due to cold break in ? is 2.5 too rich for break in?
02-12-2007, 08:32 PM
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RE: o.s. o.b. piston & sleeve
ron, the piston is now loose all the way out the top of sleeve. i know i need a new piston/sleeve. i`m trying to get an idea of what temp. it should be. the only thing i`ve been told is you shouldn`t be able to hold your hand on the head for more than 2-3 sec. i don`t have a temp. gauge. CARTER
02-12-2007, 08:39 PM
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RE: o.s. o.b. piston & sleeve
ron, i know i can`t come close to you for low temp, but our low 2 weeks ago was 14. i live in cent. cal. elevation 2500 ft. the lake fills w/melted snow. the water is ice cold. amb. today was 45. CARTER
02-13-2007, 06:22 AM
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RE: o.s. o.b. piston & sleeve
I don't beleive cutting off the water completly is the answer, a restriction of some sort on the pipe where you can adjust your water flow, (act Like a thermostat ) to suit your conditions and work from there, I your case when a motor gets that hot your Lubricateing ablity breaks down and then seizure will start to occur.
02-13-2007, 08:43 AM
#10
RE: o.s. o.b. piston & sleeve
IN THE COOL WEATHER AND COLD WATER THE OUTSIDE TEMP OF THE ENGINE WILL BE MUTCH COOLER THAN IN THE SUMMER, BUT THE ACTUAL COMBUSTION TEMP AND PISTON TEMP INSIDE THE ENGINE IS MUCH HIGHER OF CORSE. THE ENGINE MUST HAVE WATER FLOWING THRU IT OR YOU WILL SMOKE THE PISTON AND LINER. IF THE ENGINE IS HOT TO THE TOUCH IT IS MOST LIKELY RUNNING TO HOT. IF THE ENGINE RUNS GOOD DON'T WORRY ABOUT OUTSIDE TEMP OF THE ENGINE ESPECIALY IN ICE WATER!!!!!
02-16-2007, 04:13 PM
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RE: o.s. o.b. piston & sleeve
I agree with f16, if its leaned out and running good what else do you want. If you're running stock exhaust, the lack of back pressure probably won't let it build much heat. If you're running the correct pipe it will build more heat and also running the hottest plug you can get (Odonnell red) will help. Also head clearence can be a factor.
Bottom line if it's running good and cool, go have fun. That last 100 rpm can be expensive.
gh
Bottom line if it's running good and cool, go have fun. That last 100 rpm can be expensive.
gh
