Gentlemen help please
I have spent two hours here now and still can't find the answer. My toying with Minis is some twenty years old, and I am just rebuilding a little pickup I found. Living in British Columbia info that used to readily available twenty years ago is hard to come by. And my memory isn't what it used to be.
I am looking for offset boring details. I have the Vizard book, and that makes reference to offsetting a smaller block. Do the same specs apply to a 1275? My question really is :
1. how much and which way to offset bore a 1275 block that cam eout of Mtro from what I understand to take the AE20659 73.5mm pistons.
2. Piston to wall clearance for the AE20659 pistons
Can anyone help please?
1380 Offset Boring
Started by
Fredy
, May 30 2007 05:40 PM
3 replies to this topic
#2
Road Runner
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Speeding Along Now
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Posted 30 May 2007 - 05:48 PM
If it's the same as mine then there is a drawing of the offset though it is for 74.7 pistons I would think it would be similar for 73.4 pistons.
#3
Sprocket
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Great on Injection faults
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Posted 30 May 2007 - 09:40 PM
move cylinder 1/2 centers 10 thou away from the center of the block. Move cylinder centers 3/4 10 though the oposite way from the center of the block. Thereby increasing the cylinder centers between 1/4 and 2/3 by 20 thou. Move all cylinder centers 10 though towards the pushrod side of the engine.
That last bit is usualy ommitted, but it gives a little more metal where the main oil gallery is.
As for piston clearance, either ask your machinist who is machining the bore or email/ phone AE. A standard clearance would most probibly be fine.
That last bit is usualy ommitted, but it gives a little more metal where the main oil gallery is.
As for piston clearance, either ask your machinist who is machining the bore or email/ phone AE. A standard clearance would most probibly be fine.
#4
Fredy
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Starting My Mini Up
Posted 31 May 2007 - 02:41 PM
move cylinder 1/2 centers 10 thou away from the center of the block. Move cylinder centers 3/4 10 though the oposite way from the center of the block. Thereby increasing the cylinder centers between 1/4 and 2/3 by 20 thou. Move all cylinder centers 10 though towards the pushrod side of the engine.
That last bit is usualy ommitted, but it gives a little more metal where the main oil gallery is.
As for piston clearance, either ask your machinist who is machining the bore or email/ phone AE. A standard clearance would most probibly be fine.
Thanks a lot guys. That will do me.
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