RoadRace
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Status Updates posted by RoadRace
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New set of rocker arms, new lash pads and +2mm retainers from SW Motorsport in Australia. Love those Aussies, they love their Datsuns!
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ya those are the guys. i needed a 5.5mm shim for the cam in it now, never occurred to me that a stock retainer would work. interesting!! i'm putting together another motor for the race car. got all the parts now - except shims. i got another cam for this motor, more lift/duration. i might try the 'pocketed/dimpled' shims and test your theory out!
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I have stacks of the nissan pads but wish I discovered these guys so I dodnt have to buy retainers. as they come in suggested sizes also.
However I didnt know enought about stuff back then and got the nissan ones thru the dealer back in the day and bought lots of sizes.
key here knowing what size you need then the shipping. I wish someone imported these locally.
Too many factors in guess what size ones needs. On a new can .150/.160 seems to work.
Regrind it about .180/.190 then factor in valve seat grind ,valve grind , and make sure the stem height is equel across the top so you can use the same on size. or close to it.
I seen a head with like 150 180 and on it as the it was cut all sorts of ways.
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The socket-load strength of the valve stem in the dished shims is probably why you don't need retainers. The retainers on mine were stock, but the engine builder ground that lip down that supports the shim to almost flat because the rocker geometry was bad. My head was milled 2mm, so cam tower shims were needed to bring the rocker arm geometry back to square. With a small base circle regrind cam, cam tower shims - it needed .220" shim to get the pattern in the center, SW had the 5.5mm, which was .216" that's ok, almost negligible impact on the swipe pattern.
no idea why this is upside down - i tried to fix that, didnt work lol
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selling the house, hating the job, staring at the datsun- at least something makes me smile.
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just when i thought i was going racing this weekend, i put the head on teh motor to degree the cam in and the piston crown hits the chamber - ugh.
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bent crank = no fun
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What did you do??
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the bearing clearances were bad - 2 were ok, but the thrust and #4 were close to .005". i thought "ok, bearings are worn" i put in new ones. now the crank turns nice for 3/4 of a revolution, then binds up. i also only have .001" of thrust, so the crank was bent and its getting straightened right now!
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did you put them on the inside the tower? that might move it up. they're supposed to go on the outside. Yeah, they're ugly but they work! been on the car for many years and the alignment doesn't move. i scribe lines for each degree of camber for quick alignment.
