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is that just because that's where the timing marks all line up?One of the weird things is they want you to remove the cams with #1 cylinder at 105degrees BTDC.
I don't know why you send it all the way to Tim, he just takes them down to the "jiffy port" on the corner & gets 'em done while he waits! :lolWell, the head has been shipped along with my left nut to Tim Radley. He seems to like payment at the same time as work arrives. Was going to stick a dog turd in one of the ports but refrained as I don't want to start an international gross out war. Plus just knowing him I can tell you he would win hands down.
lol . i just discovered this method of measuring squish here:While I was making Pix, here is one of my cool tools.
I use this to measure the quench clearance that many refer to as "squish". It is a Deck Height Bridge and dial indicator. The dial indicator is acurrate to a 1/2 of a thousand and is the only one I have ever seen like that. Not neccesary to be accurate more than .001 but is the only indicator I have ever seen that does that.
Diel knows this but for others that read this, this tool is used to measure how high the piston comes up in the bore at Top Dead Center. You place the bridge over the block, zero it out, and then rotate the crank. Ideally the outer 4 edges of the piston should never rise higher than the block. I actually prefer to see it about .005 inch from the top of the block. Thats POSITIVE deck height. You would add that # .005 to the thickness of the "compressed" head gasket and thats how much clearance you have from the pistons hitting the cylinder head which hangs over the bore.
How much diel choses to set his piston to head clearance I dont think he has said.
My rule of thumb is .040 inch for a 15,000 RPM motor and never less than .035 for any other motors.
However there are plenty of engine builders that will tell you they run it tighter.
I once had an engine with .030 piston to head clearance (0 deck height and a .030 thick head gasket) and it ran fine. The only thing keeping the pistons from hitting the cylinder head was the thickness of the head gaskets. But when I rebuilt it again I could see where the pistons were hitting the head. The Wiseco pistons have raised arrows on them pointing towards the exhaust and you could see where the arrows were hitting the cylinder head. That is about perfect.
And of course when using this tool you need to rock the piston fore and aft at TDC to get a accurate measurement. Becuase the piston will rock at TDC on the exhaust stroke only and that is when it usually hits.
JJ
Makes you wonder about the 4 piece solder method though, for example if you measure 22,22,32,32 the average comes out to 27. Should you worry about the 22? If you had an engine with a bit looser piston to bore clearance (like the earlier R1's) would the pistons hit with that measurement...I am no motor building pro, but i always shoot for .027-.030 P-H. Last motor i put together was at .024, but it has aftermarket rods in it.
I use the solder method for figuring squish myself. I take four measurments per piston add them together and then divide by four to get my actual clearance.
I built an 04 G1K motor that has the pistons above the deck. Only motor i have seen like that, and only like that because the people who bored the cylinders took allot off the deck. Still running to this day. 178hp 14 to 1 compression on pump gas.