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Sportster Motorcycle Motor - Top End Discuss Sportster Motorcycle Top End issues. Rockerboxes, Valves, Cylinders, Pistons, Rings, Lift Rods, etc...

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  #1  
Old 14th September 2018
t120r t120r is offline
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Default Machining for 30 degree chamber

Just postulating about how hard it would be to cut my own 30 degree chambers. I have a Bridgeport and a rotary table... Being in Canada means outrageous shipping costs and border fees. Hard to justify sending heads out for that. Especially when I have a mill.
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never know til you try
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That's what i figured. If i use a wide ball end bit on a 30 degree angle, i can get it pretty close to perfect. Hardest part will be measuring to match the piston.
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How about claying the head to get your clearances?
There is probably something better than modeling clay but you get the idea.
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Default

Sorry, i don't think i explained what i meant. With a 3.5" bore piston, for example, does the edge of the 30 degree quench pad end at 3.5"? Does it go a few thou wider or narrower due to the gap between piston and wall?
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I could check my spare 1250 heads if you like ?
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That would be great Thank you.
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Quote:
Originally Posted by t120r View Post
Sorry, i don't think i explained what i meant. With a 3.5" bore piston, for example, does the edge of the 30 degree quench pad end at 3.5"? Does it go a few thou wider or narrower due to the gap between piston and wall?
We cut them .030" smaller than the bore size, because the crown of the piston is smaller than the bore. If you cut it at the bore size, you'll never get a tight squish clearance. Getting it centered over the bore is also important.
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Quote:
Originally Posted by aswracing View Post
We cut them .030" smaller than the bore size, because the crown of the piston is smaller than the bore. If you cut it at the bore size, you'll never get a tight squish clearance. Getting it centered over the bore is also important.

You are awesome for sharing tech info - as always, and really make the forum great! Rep to you guys.
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Thank you for the info. Once the weather ends the bike season here, I'll be ripping my heads off. I'll decide if I want to keep these Edelbrock heads or not (Love the look) and if so, I'll order up a 1275 kit. Unless I screw up my chamber... Then I'll go to 88 or 90cid and retry the chamber again.
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