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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Does plating a cylinder change the castings properties?
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[QUOTE="jmics19067, post: 679837, member: 27963"] I can understand the high silcon content giving you troubles, Although I am by no means an expert maybe a different style of tap and tapping process is in order.Instead of a standard 4 fluted straight shank tap in the tighten half back off 1/4 style of tapping maybe something like a three spiral fluted tap in a constant feed would be better suited to that material. or some type of strange combination of type of tap ,process and or cutting fluid is needed for a clean cut. unfortunately that will basicly leave out helicoils since I only know of type of helicoil tap <4 straight flutes>. Possibley you might be able salvage things for the long run if you could get a standard oversized tap in the right configuration for the casting and make the holes big with a clean cut thread. Then get some 6061 rod or something more tapping friendly,wind the screw in on the side of your die to cut a slightly oversized outside thread on the rod to have a slight intereference fit in the holes of the jug and loctite them in. Center drill the rod for your stainless helicoils and then loctite them in,let set clean up any loctite that could grab onto your studs and install studs. I could see most of this work being done on a common drill press but you will most likely have to have the top of the cylinder surfaced so there in no ridges from the installed homemade nutsert rods.Whether or not water jacket holes or head gasket sealing of the fine cracks from the rod to cylinder thread is going to be a problem but if you are going to be ending up throwing the jug away I would try it as a last resort. IF my idea pans out the way I envision it you could possibley have a very course thread holding your "nutserts" so crumbling isn't as much of a problem for thread contact at the jug and then a material more able to handle the work of removing and reinstalling the studs often. did that come out clear? Hopefully a machinist could tell you if it is a sound idea to try. [/QUOTE]
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Does plating a cylinder change the castings properties?
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