head porting again...
10-09-2003, 07:59 PM
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head porting again...
Ok i have to call the machine shop i think i am going to have my head done. I dont want to sould like a moron so i need some questions anwsered for me... Porting is basicly opening all the ports bigger right? 2ed do or should they be doing anything else like planing the head or repalcing anyparts? last how do i give them the head with the cam and all the valves or should i take all that stuff b4 i take it to them? thx
10-09-2003, 09:52 PM
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Take the cam out, give them everything else.
They are going to do a "complete" head job. Valve grind (3 or 5 angle), new valve guides, seals, hot tank, magnaflux, plane the head surface, and port if you pay them. Re read that article Tip put up the other day, it explains the porting process to a "T".
10-10-2003, 07:03 AM
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Yes, I generally refer to any crack detecting as Magnaflux.
Even though I know, since aluminum is obviously not magnetic. I just grew up on cast iron heads so I was easy for me to get stuck on that word. Its quicker to say Magnaflux than "The machine shop will check for leaks by pressure testing or dye finder." Thank you for pointing that out, perhaps I can break that habit some year. Kinda like how people (like me) still refer to block and head cleaning as "hot tank" even though acid hot tanks were pretty much banned by the EPA over a decade ago, in place of the parts oven / bead blast procedure. Same thing :-)
10-10-2003, 01:48 PM
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Wow, that's one of the few.
Now there still are quite a few "steam bath" machines that spray steam and hot water mixed with parts cleaner on parts, but generally they do not clean nearly as well as the oven/beadblast, or the acid tanks.
The benefit of the traditonal "hottank" over the ovens is the acid can penetrate every bolt hole and clean them out, where the bead blast /oven can't. Most machine shops won't even chase the threads afterwards, because of time issues.
If your machinist still has an acid hot tank that's awesome, they're tough to find and have to be in a pretty "lax" EPA area, where inspectors wouldn't find them!
The benefit of the traditonal "hottank" over the ovens is the acid can penetrate every bolt hole and clean them out, where the bead blast /oven can't. Most machine shops won't even chase the threads afterwards, because of time issues.
If your machinist still has an acid hot tank that's awesome, they're tough to find and have to be in a pretty "lax" EPA area, where inspectors wouldn't find them!
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