Overbore questions for a d16 engine.
06-02-2007, 10:40 AM
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Overbore questions for a d16 engine.
Hey guys, I have a few questions to ask.
I personally have assembled a few engines in the past but non required an overbore. I am going to be rebuilding two fairly high KM Honda engines but I'm just having a few problems understanding the over bore process.
ok, factory bore size on a d16 is 75mm...now from what I understand, there are two main overbore sizes that can be done .025 and .050
So if I were to overbore a 75mm engine by going .025, would that make the bore 75.25mm?
if the bore of the cylinder walls is 75.25mm...what size piston would I need to purchase.
Reason I'm asking is because on the first engine, I want to have the cylinder walls bored out by .025" but the pistons I was sent have 75.5 stamped on top of them.
Was I sent the wrong pistons? or am I all confused and lost?
thanks
I personally have assembled a few engines in the past but non required an overbore. I am going to be rebuilding two fairly high KM Honda engines but I'm just having a few problems understanding the over bore process.
ok, factory bore size on a d16 is 75mm...now from what I understand, there are two main overbore sizes that can be done .025 and .050
So if I were to overbore a 75mm engine by going .025, would that make the bore 75.25mm?
if the bore of the cylinder walls is 75.25mm...what size piston would I need to purchase.
Reason I'm asking is because on the first engine, I want to have the cylinder walls bored out by .025" but the pistons I was sent have 75.5 stamped on top of them.
Was I sent the wrong pistons? or am I all confused and lost?
thanks
06-02-2007, 11:35 AM
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Re: Overbore questions for a d16 engine. (Mr.R)
ok, I was pretty confused but got my issue resolved....thanks to a local guy on a forum. I'll keep this here just incase somebody else ever needs this for reference or clarification.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HELP »</TD></TR><TR><TD CLASS="quote">You just have your measurements a little confused.
The two common boring sizes you refer to are .020" and .040". Thus if you bore .020" on a stock d16, you dont end up with 75.25mm. You need to convert inches to mm, and then add.
.020" = .5mm
.040" = 1mm
So if you want the cylinder walls bored out by .020", then you require the 75.5mm pistons, which you already have.</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HELP »</TD></TR><TR><TD CLASS="quote">You just have your measurements a little confused.
The two common boring sizes you refer to are .020" and .040". Thus if you bore .020" on a stock d16, you dont end up with 75.25mm. You need to convert inches to mm, and then add.
.020" = .5mm
.040" = 1mm
So if you want the cylinder walls bored out by .020", then you require the 75.5mm pistons, which you already have.</TD></TR></TABLE>
06-03-2007, 10:14 AM
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Re: Overbore questions for a d16 engine. (Mr.R)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr.R »</TD></TR><TR><TD CLASS="quote">Hey guys, I have a few questions to ask.
I personally have assembled a few engines in the past but non required an overbore. I am going to be rebuilding two fairly high KM Honda engines but I'm just having a few problems understanding the over bore process.
ok, factory bore size on a d16 is 75mm...now from what I understand, there are two main overbore sizes that can be done .025 and .050
So if I were to overbore a 75mm engine by going .025, would that make the bore 75.25mm?
if the bore of the cylinder walls is 75.25mm...what size piston would I need to purchase.
Reason I'm asking is because on the first engine, I want to have the cylinder walls bored out by .025" but the pistons I was sent have 75.5 stamped on top of them.
Was I sent the wrong pistons? or am I all confused and lost?
thanks </TD></TR></TABLE>
it's .010" and .020" aka .25mm and .5mm over
you have your measurement signals crossed.
I personally have assembled a few engines in the past but non required an overbore. I am going to be rebuilding two fairly high KM Honda engines but I'm just having a few problems understanding the over bore process.
ok, factory bore size on a d16 is 75mm...now from what I understand, there are two main overbore sizes that can be done .025 and .050
So if I were to overbore a 75mm engine by going .025, would that make the bore 75.25mm?
if the bore of the cylinder walls is 75.25mm...what size piston would I need to purchase.
Reason I'm asking is because on the first engine, I want to have the cylinder walls bored out by .025" but the pistons I was sent have 75.5 stamped on top of them.
Was I sent the wrong pistons? or am I all confused and lost?
thanks
</TD></TR></TABLE>it's .010" and .020" aka .25mm and .5mm over
you have your measurement signals crossed.
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