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Unread 02-13-2011, 08:38 PM   #811
tsconver
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Quote:
Originally Posted by snobrdrkid07 View Post
Ah did not know that there was less space between each cylinder. Something that I did not know.
allpar is a great source, they claim the limit is around 330 inches compared to the standard 273 inches. but you would probably need a perfect block to do that.

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Unread 02-13-2011, 10:16 PM   #812
SplitNail
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So what you are saying is that you can't bore very much?
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Unread 02-14-2011, 06:42 AM   #813
snobrdrkid07
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The difference is 0.934 liters...
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Unread 02-14-2011, 08:21 AM   #814
SplitNail
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Quote:
Originally Posted by snobrdrkid07
The difference is 0.934 liters...
Hmmm just what I thought. Not much.
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Unread 02-14-2011, 09:59 AM   #815
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Quote:
Originally Posted by SplitNail View Post
So what you are saying is that you can't bore very much?
Quote:
Originally Posted by snobrdrkid07 View Post
The difference is 0.934 liters...
Quote:
Originally Posted by SplitNail View Post
Hmmm just what I thought. Not much.
standard bore is 3.660 inches, you can get 3.701 in pistons for it. So that is 40 thou over. Would not have much material left between the cylinders though and I bet the water jackets would be pretty thin. Probably would take a perfect block to go that big.
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Speak softly and carry a big stick.

We have room but for one flag, the American flag . . . We have room but for one language, and that is the English language . . . And we have room for but one sole loyalty...and that is a loyalty to the American people. T. Roosevelt 1919

2003 Grand Cherokee 4.0L Laredo

My Build Thread

A few goodies
http://s257.photobucket.com/albums/h...umb55839/jeep/

2001 Kawasaki 1200 ZRX
A few Speed parts, fun to ride
http://www.zrxoa.org/

2006 Red Liberty
Wife's ride, pretty stock
http://i257.photobucket.com/albums/h...mage0008-1.jpg

http://www.cnc4x4.org/

http://www.treadlightly.org/

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Unread 02-14-2011, 10:31 AM   #816
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Quote:
Originally Posted by tsconver

standard bore is 3.660 inches, you can get 3.701 in pistons for it. So that is 40 thou over. Would not have much material left between the cylinders though and I bet the water jackets would be pretty thin. Probably would take a perfect block to go that big.
Can I get any stroke out if it?
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Unread 02-14-2011, 10:54 AM   #817
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Quote:
Originally Posted by SplitNail View Post
Can I get any stroke out if it?
no clue, i just googled summit and looked at what they had in pistons, not sure about cranks, they have none for the 4.7
__________________
Speak softly and carry a big stick.

We have room but for one flag, the American flag . . . We have room but for one language, and that is the English language . . . And we have room for but one sole loyalty...and that is a loyalty to the American people. T. Roosevelt 1919

2003 Grand Cherokee 4.0L Laredo

My Build Thread

A few goodies
http://s257.photobucket.com/albums/h...umb55839/jeep/

2001 Kawasaki 1200 ZRX
A few Speed parts, fun to ride
http://www.zrxoa.org/

2006 Red Liberty
Wife's ride, pretty stock
http://i257.photobucket.com/albums/h...mage0008-1.jpg

http://www.cnc4x4.org/

http://www.treadlightly.org/

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Unread 02-14-2011, 11:01 AM   #818
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Wouldn't I be losing power if my piston rings were bad due to low compression?
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Unread 02-14-2011, 11:30 AM   #819
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If your piston rings were bad, and oil was getting in the combustion chamber, yes you would be loosing power.
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Unread 02-14-2011, 11:35 AM   #820
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Quote:
Originally Posted by 1stblack97ZJ
If your piston rings were bad, and oil was getting in the combustion chamber, yes you would be loosing power.
That's what I thought.. If the rings are bad does that mean complete engine rebuild?
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Unread 02-14-2011, 12:53 PM   #821
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No, but If you are going to go through all the trouble, you might as well rebuild it so you can have the bore size checked etc, because you might get the same issue again if your cylinders aren't round.

Lets just say that if my piston rings needed replacing, I would just go ahead and rebuild the engine.
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Unread 02-14-2011, 01:08 PM   #822
SplitNail
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Quote:
Originally Posted by 1stblack97ZJ
No, but If you are going to go through all the trouble, you might as well rebuild it so you can have the bore size checked etc, because you might get the same issue again if your cylinders aren't round.

Lets just say that if my piston rings needed replacing, I would just go ahead and rebuild the engine.
Yea, I would most likely do the same. Would I need new pistons? Just rings, main bearings, rid bearings, and have the block true'd. Right? I'm just thinking out loud.
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Unread 02-14-2011, 01:18 PM   #823
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You wouldn't need new pistons unless you have the cylinders bored, then you would want to get oversized pistons to match the bore.

You would also need cam bearings, possibly a new camshaft, and some other stuff depending on what kind of condition the motor is in.
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Unread 02-14-2011, 01:33 PM   #824
SplitNail
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Quote:
Originally Posted by 1stblack97ZJ
You wouldn't need new pistons unless you have the cylinders bored, then you would want to get oversized pistons to match the bore.

You would also need cam bearings, possibly a new camshaft, and some other stuff depending on what kind of condition the motor is in.
Okay sweet deal. Thanks for all the info. What is a good compression reading on the 4.7l?
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Unread 02-14-2011, 01:37 PM   #825
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Quote:
Originally Posted by 1stblack97ZJ View Post
You wouldn't need new pistons unless you have the cylinders bored, then you would want to get oversized pistons to match the bore.

You would also need cam bearings, possibly a new camshaft, and some other stuff depending on what kind of condition the motor is in.
th 4.7 is an overhead cam motor so I doubt he will need new cams and bearings.
__________________
Speak softly and carry a big stick.

We have room but for one flag, the American flag . . . We have room but for one language, and that is the English language . . . And we have room for but one sole loyalty...and that is a loyalty to the American people. T. Roosevelt 1919

2003 Grand Cherokee 4.0L Laredo

My Build Thread

A few goodies
http://s257.photobucket.com/albums/h...umb55839/jeep/

2001 Kawasaki 1200 ZRX
A few Speed parts, fun to ride
http://www.zrxoa.org/

2006 Red Liberty
Wife's ride, pretty stock
http://i257.photobucket.com/albums/h...mage0008-1.jpg

http://www.cnc4x4.org/

http://www.treadlightly.org/

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