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B20E suggestions 140-160

posted by  someone claiming to be B20Paul on  Wed Aug 12 03:42 CST 2009 [RELATED]

Good work so far, what did you get for a valve grind? (Angles, seat widths)
Did you get a 30 degree backcut on the inlet valves?
What size & type are your valves?(New stock, old stock, stainless?)

Here's a few things I'd do:
1: Blend the throat cut of the inlet in to the cast area of the port with a 40 grit emery roll.
2: Do same for the exhaust + put an increasing radius on the SSR, DO NOT take any meat from the plug side of the port, you need that to help the gas make the hard 90 degree turn.
3: Lengthen the combustion chamber to 92mm to unshroud using an old headgasket.
4: You have the spark plug area looking neat, try & put a little concave area on the inlet side of the spark plug to assist swirl.
5: Make sure you put use a couple of junk valves in the chamber you are working on so you don't accidentally run in to it. if you lack any confidence at all, skip doing anything to the ports.


--
"Rupert Murdoch has done a fine job of recruiting an unpaid dolt army on behalf of corporate dominance concentrated wealth. " - Snootfull






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