Machining engine components
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Machining engine components
I'm gonna start building a 2.0 N/A zetec soon which i hope to get to around 200 BHP which will be goin in my 5b escort and have a few questions.
Gonna start stripping it soon and am gonna concentrate on the block first but i want to know.
1) how much power would a untouched std crank be ok for?
2) it'll have new shells throughout but would it be worth having the crank ground down with bigger bearings?
3) what are the stages of grinding a crank starting from a std one..my boss has been talking about thous of a inch and such but i dont understand these terms to well.. how much should a crank be ground and then what size bearings should it have
4) also what about boring out the cylinders. i've heard of boring out to .5 from std.. what are the stages of this?
5) and Can i use forged accralite pistons with steel rods on a std crank?
thaks in advance... this is my first engine build and just gatherin info befor i start.
Gonna start stripping it soon and am gonna concentrate on the block first but i want to know.
1) how much power would a untouched std crank be ok for?
2) it'll have new shells throughout but would it be worth having the crank ground down with bigger bearings?
3) what are the stages of grinding a crank starting from a std one..my boss has been talking about thous of a inch and such but i dont understand these terms to well.. how much should a crank be ground and then what size bearings should it have
4) also what about boring out the cylinders. i've heard of boring out to .5 from std.. what are the stages of this?
5) and Can i use forged accralite pistons with steel rods on a std crank?
thaks in advance... this is my first engine build and just gatherin info befor i start.
PassionBMW.com Member
Joined: May 2003
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From: UK
Re: Machining engine components
Originally Posted by fo0q
I'm gonna start building a 2.0 N/A zetec soon which i hope to get to around 200 BHP which will be goin in my 5b escort and have a few questions.
Gonna start stripping it soon and am gonna concentrate on the block first but i want to know.
1) how much power would a untouched std crank be ok for?
450+ it seems
2) it'll have new shells throughout but would it be worth having the crank ground down with bigger bearings?
Depends on the condition of the journals, if they are fine and still std size, then use std size bearings
3) what are the stages of grinding a crank starting from a std one..my boss has been talking about thous of a inch and such but i dont understand these terms to well.. how much should a crank be ground and then what size bearings should it have
A machine shop will sort that mate, leave it upto them
4) also what about boring out the cylinders. i've heard of boring out to .5 from std.. what are the stages of this?
Just bore it out so you have a clean bore, usually youd start with 0.25mm oversize, if the existing bore is std and worn. If its 0.25 oversize already, you'd go out to 0.5mm oversize etc
5) and Can i use forged accralite pistons with steel rods on a std crank?
Of course!
thaks in advance... this is my first engine build and just gatherin info befor i start.
Gonna start stripping it soon and am gonna concentrate on the block first but i want to know.
1) how much power would a untouched std crank be ok for?
450+ it seems
2) it'll have new shells throughout but would it be worth having the crank ground down with bigger bearings?
Depends on the condition of the journals, if they are fine and still std size, then use std size bearings
3) what are the stages of grinding a crank starting from a std one..my boss has been talking about thous of a inch and such but i dont understand these terms to well.. how much should a crank be ground and then what size bearings should it have
A machine shop will sort that mate, leave it upto them
4) also what about boring out the cylinders. i've heard of boring out to .5 from std.. what are the stages of this?
Just bore it out so you have a clean bore, usually youd start with 0.25mm oversize, if the existing bore is std and worn. If its 0.25 oversize already, you'd go out to 0.5mm oversize etc
5) and Can i use forged accralite pistons with steel rods on a std crank?
Of course!
thaks in advance... this is my first engine build and just gatherin info befor i start.
Thread Starter
Wahay!! I've lost my Virginity!!
Joined: May 2004
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cheers mate thats a great help..
one last thing for tonight, if i bored out a std cylinder 0.25mm bigger.. can you get bigger rings for it or would ya need the next size up in piston.
i know i should wait till the engine is apart so i can meaure it all but would feel better with the info on board first.
one last thing for tonight, if i bored out a std cylinder 0.25mm bigger.. can you get bigger rings for it or would ya need the next size up in piston.
i know i should wait till the engine is apart so i can meaure it all but would feel better with the info on board first.
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