The next step is the big one. I need to find a reliable machinist to turn down the journals on my crankshaft. I'll also be ordering a set of big end shells and a new rear bearing. I need to get a good idea of what undersize bearings to order.
Below is the measurements of the crank that I've taken. It looks to be a 30 thou under on the big ends, and a 20 thou under on the rear main.
Anyone know, what measurements I should tell the machine shop?
I would think:
-0.030" bearing shells... grind the big ends area "A" to 1.5950" / 1.5945"
-0.020" rear main grind the rear shaft area "C" to 1.4795" / 1.4790"
But would it be more wise to hand the machine shop the rods, and bearing shells .. and ask for a gap. What gap? Would that be 1.0 thou or 1.5 thou gap?
Opinions?
I just spoke with David at Stewart Engineering. My suppositions were correct and the measurements listed above are correct for -0.30" on the crank pins.
ReplyDeleteI learned that the exchange on the rear main allows me to specify any dimension on the rear main. They will simply machine that out to whatever I need.
Now I just need to get that plug out of the end of the crank and clean that out VERY well.