Does Boring an Engine Add any HP?

88GTMustang

New Member

Oct 31, 2003

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LA california

Mar 16, 2004

#1

• Mar 16, 2004

• #1

Like .030 ?

 

P

proxses

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Dec 12, 2000

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Dayton, Oh

Mar 16, 2004

#2

• Mar 16, 2004

• #2

Not really. What it does is unshroud the valves so they can flow with less restriction. Most 5.0 heads don't really have this problem. So the biggest reason is to build an engine with a fresh bore and hone on your cylinders. This make for a clean rebuild.
The new modular engines see more of an increase because they do have a valve shouding problem.

 

S

Sicarius428

Active Member

Jan 6, 2004

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Mar 16, 2004

#3

• Mar 16, 2004

• #3

Probably about a 4hp difference.
Kevin

 

88GTMustang

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Oct 31, 2003

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Mar 16, 2004

#4

• Mar 16, 2004

• #4

so basically it dont do $hit for power?

 

M

matm347

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Aug 29, 2000

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#5

• Mar 16, 2004

• #5

Everything else the same, I would give 4-10 with most of the H/C/I combos.

 

88stangmangt

Active Member

Nov 25, 2003

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Stafford,VA

Mar 16, 2004

#6

• Mar 16, 2004

• #6

i would just hone it. if your looking for a re-build

 

408stroker5.0

The world would be a better place if all males jus

Mar 10, 2004

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Bonnyville, Alberta, CANADA

Mar 16, 2004

#7

• Mar 16, 2004

• #7

Boring an engine add's Displacement and Compression, which in turn makes more power. So, technically yes it does add HP. Not a huge difference though, but enough to prove itself on the dyno.

 

Michael Yount

Mustang Master

Apr 10, 2002

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Charlotte, NC

Mar 16, 2004

#8

• Mar 16, 2004

• #8

It adds displacement; not quite sure how it adds compression though. The main reason for boring is to true up the cylinder - returning it to perfectly round. This allows for better cylinder/ring seal so you get all the cylinder pressure you can with your breathing package. Over time, the nature of piston engines is to oval-out their cylinders; the .030" overbore cleans that up and returns the cylinder to round.

 

I

iamarolltide

New Member

Mar 10, 2004

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Mar 16, 2004

#9

• Mar 16, 2004

• #9

do it ,I see no reason to build an engine and not do it right.
"there is no replacement for displacement"
I tend to agree with that

 

88GTMustang

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Oct 31, 2003

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Mar 16, 2004

#10

• Mar 16, 2004

• #10

well i got me a 2000 explorer block so i was just wondering about it cause me friend has a S10 with a 350 and keeps saying that he wants to bore it out 30 over and it has like 10k on it and was wondering why he was doing this

 

88stangmangt

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Nov 25, 2003

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Stafford,VA

Mar 17, 2004

#11

• Mar 17, 2004

• #11

bigger displacement

 

90mustangGT

I felt sorry for girls because

Founding Member

Jan 15, 2002

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Dallas, GA

Mar 17, 2004

#12

• Mar 17, 2004

• #12

As said before, it is just a procedure for making the cylinder perfectly round. Yes, it would unshrowd the valves some, and of course adding cid is good for power, but it's not worth tearing down the engine to do. Of course some class restricted races, every little bit makes all the difference. So they bore thiers way out to the limit of 310cid, about 4.060.

Not mentioned, but one bad thing about boring over a cylinder hole is it makes the walls thinner, so more prone to cracking.

 

Michael Yount

Mustang Master

Apr 10, 2002

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Charlotte, NC

Mar 17, 2004

#13

• Mar 17, 2004

• #13

It occurs to me that boring your engine significantly won't increase HP much; but increasing your HP significantly will keep your car from being boring.

 

S

SmockDoiley

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Jun 14, 2003

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San Diego, CA

Mar 17, 2004

#14

• Mar 17, 2004

• #14

Tell your friend he's a freakin moron if he bores it. Anybody who bores an engine for horsepower needs to be shot in the face, especially a good engine with 10k on it. The reason to bore is like he said. Over time a cylinder loses round and the only way to get it back is to remove some metal by boring. The only people who should be boring are those who need to rebuild the engine because its bad, those in displacement limited race classes that need as much edge as possible, and those boosting that need a true round even better than the factory.

 

N

noslow5_0

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Nov 7, 2003

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dallas tx.

Mar 17, 2004

#15

• Mar 17, 2004

• #15

Michael Yount said:

It occurs to me that boring your engine significantly won't increase HP much; but increasing your HP significantly will keep your car from being boring.

Click to expand...

hahhahaha.... thats funny

 

Mach428

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Dec 7, 2003

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Mar 17, 2004

#16

• Mar 17, 2004

• #16

The only diffrence you will probably note is a slight power curve change, over boring an engin will usually make it slightly stronger off the bottom.

 

IndyBlk5.0

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Nov 24, 2003

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New Whiteland, IN

Mar 17, 2004

#17

• Mar 17, 2004

• #17

That guys a moron, dont listen to him, if he only wants to bore it out, and not change the crank ect. to make a stroker, then he really is dumb on a 10k motor.

 

S

SmockDoiley

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Jun 14, 2003

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Mar 17, 2004

#18

• Mar 17, 2004

• #18

Like I said, freakin moron; shoot him in the face!!

 

Michael Yount

Mustang Master

Apr 10, 2002

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Charlotte, NC

Mar 17, 2004

#19

• Mar 17, 2004

• #19

As a practical matter, any power increase attributable to a .030" overbore is statistically irrelevant.

Smock - you figure out your speedo?

 

PURESTREET5006

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Apr 1, 2003

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In the tech line for tear down"AGAIN"

Mar 17, 2004

#20

• Mar 17, 2004

• #20

My block is a .060 which makes it a 310 and the only reason why is due to P/S class max is 311 cid and i have a 69302 block which is much thicker.....it's the whole combination that makes power not just this part or that part.