You can get away with 44.6mm on a 200/66mm on a standard piston.sean brady scooters wrote:on a 200/66mm bore ,a 42mm wide exhaust is roughly 65% of bore...red ghost wrote:Hi Sean,
I understand what you're saying, but how dose that relate with the exhaust port width being a percentage of the bore size?
.66 x 65 =42.9mm
70% would be .66 x 70 = 46.2mm
pistons/rings ...design and quality
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soosh
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What I was trying to find out is how does the ring profile effect this pressure and how much accelerated wear (if any) is caused by the ring type & pressure, and from this info which type of piston ring gives the longest service life depending on the material being used for a cylinder wall (cast iron) on a standard or mildly ported Lambretta... and also which piston ring coating (and there are many types) best suits the Lambretta cylinder for example; Titanium Nitride, Chromium Nitride etc... ?
Last edited by J1MS on Mon Dec 21, 2009 8:20 pm, edited 1 time in total.
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dsc scotty
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Golden eye is a genius with regards to piston rings, made some rings for a an asso piston for me about 10 years ago, they were 1.5mm type these were put on one of my stage 4 tuned cast iron barrels. This barrel piston /ring set up went on to win the LCGB best supporting members championship for three years in a row and is still going strong today. A testement to Goldeneyes skill and knowledge. If you need your ring sorting I,m sure he'll be of assistance.
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Mag
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Goldeneye stayed at my house on Saturday night. Luckily he didn't sort my ring out, but I ever I wanted someone to, he's the man!dsc scotty wrote:Golden eye is a genius with regards to piston rings, made some rings for a an asso piston for me about 10 years ago, they were 1.5mm type these were put on one of my stage 4 tuned cast iron barrels. This barrel piston /ring set up went on to win the LCGB best supporting members championship for three years in a row and is still going strong today. A testement to Goldeneyes skill and knowledge. If you need your ring sorting I,m sure he'll be of assistance.
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Andy Pickering
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dsc scotty wrote:you need your ring sorting I,m sure he'll be of assistance.
soosh wrote:My ring certainly needed sorting last night,itching like mad.
Mag wrote:Luckily he didn't sort my ring out, but I ever I wanted someone to, he's the man!
MODS lock it down its getting wierd now...
Ricspeed, gone but never forgotten RIP my friend #59