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Old 05-01-2003, 11:03 AM   #1
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Default What'* this all about?

ok, i cannot figure this out, boring out cylinders, when someone does this, what other modifications are needed to compensate for the extra volume of the cylinder? (eg. diffrent fuel pumps, changing compression ratio{how would you even do that?}, changeing other dimensions????????) Can i sucessfully do this? and how much should i bore out the cylinders?
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Old 05-01-2003, 11:14 AM   #2
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Default Re: What'* this all about?

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Originally Posted by 95naSTA
ok, i cannot figure this out, boring out cylinders, when someone does this, what other modifications are needed to compensate for the extra volume of the cylinder? (eg. diffrent fuel pumps, changing compression ratio{how would you even do that?}, changeing other dimensions????????) Can i sucessfully do this? and how much should i bore out the cylinders?
When you get a Engine block bored out or "Bored over" we are only talking 0.010" to 0.030" after all! A new set of piston rings that match the bored over amount are the only things needed to make that engine work ususally. As for cost, well that varies with the machine shop doing the work. Best to phone around & get quotes & then you'll know for yourself.
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Old 05-01-2003, 05:17 PM   #3
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i was under the impression that i could get it bored out more, to change from a 3.8l to a 3.85l or 3.9l? is this possible? and will it mess anything up?
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Old 05-01-2003, 07:33 PM   #4
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If you go any farther than DeathRat was talking about, you will have to get oversize pistons to match the overbore. This can go two ways.
The first and more common on a normal rebuild, the replacement pistons are made with a slightly altered dish to compensate for the larger bore. (Basicly the same compression ratio with little noticable performance differences except having everything fresh.)
The second is for performance. You decide what compression you want when getting the new oversize pistons. This can and will open a big can of worms if you aren't careful. A small increase may mean nothing more than you needing the very best fuel you can get. A bigger increase will mean changes to just about everything else engine related. (intake, exaust, heads, camshaft, computer, injectors, etc.)
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Old 05-01-2003, 09:22 PM   #5
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Its bull **** to do it on a V6 if you want a bigger enginemod your car put a 305 RWD in your car. Dont bore out a V6 its just a waste of money time .
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Old 05-01-2003, 11:51 PM   #6
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heh. sounds like my predictions were right. can't blame a guy for trying.
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Old 05-02-2003, 01:31 AM   #7
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i beg to differ boring out a V6 is not a waste of time ...and if you think putting a 305 rwd into a bonnie platform ...thats a waste of time like most 305`* are .. ..if you have 30+ thousand you can change your fwd to a rwd... as you can build a 6 into a V8 killer with some $ involve...i went the V6 buid and i`m happy in what i have done and what i have for power
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Old 05-02-2003, 01:55 AM   #8
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RPB just what is it with you???
You know all about boring out an engine yet in a different post you ask questions like a newbie concerning lifters.
You need to chill out with the smart a$$ answers if you want any help from others here. Once again, I'll state this forum is for all to learn and discuss. If that isn't your intent, keep your smart a$$ answers to yourself
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Old 05-02-2003, 03:06 AM   #9
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Alright Alright your right your right I just wanted to throw that into the mix and see what would happen dont get so critical on me. Hey its not my fault Ive never seen hydrolic lifters. I dont spend my time moding my bonne I work on old cars like my 66 ford thunderbird and Ill tell ya that is a totally differant world.

Also I shouldnt have called the 3800 a V6. 3800=god of all Engines.
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Old 05-02-2003, 11:33 AM   #10
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Just a small fact on this... the 3800 cylinders are sleeved. There is very little room to bore anything at all. To do this you must remove the sleeves (basically nothing more than a thin metal can), bore to no more than .030 over (max before breaking into the water jackets, don't race with this!), and then install replacement sleeves to the new dimensions. Most of the time, in extreme wear situations, only the sleeve has to be replaced...no boring is necessary.

The better Idea for more output involving the cylinders is higher compression pistons. No boring, no replacement sleeves, and if you're really inclined, you don't even have to remove the engine to change them out.

Just my .10, cause my .02 is free.
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