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post #1 of 9 (permalink) Old Mar 2nd, 07, 09:02 PM Thread Starter
 
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engine term

What does it mean when an engine is bored .30 over.
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post #2 of 9 (permalink) Old Mar 2nd, 07, 09:08 PM
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Re: engine term

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Originally Posted by camaro nut View Post
What does it mean when an engine is bored .30 over.
it means the engine bore has been machined .030" larger than what it was stock from the factory. Mostly done to clean up the cylinder bore when rebuilding if it has excess wear or scratches.

Jody


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post #3 of 9 (permalink) Old Mar 2nd, 07, 09:09 PM
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Re: engine term

The cylinder bore is bored out 0.030" over the stock OE (original equipment as delivered from the manufacturer) diameter.

Jody beat me to it.

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post #4 of 9 (permalink) Old Mar 2nd, 07, 10:53 PM
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Re: engine term

If the original cylinder bore diameter was 4.00", after boring .030" the diameter would be 4.030". You will also need to purchase .030" over pistons and rings to match the new bore diameter.
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post #5 of 9 (permalink) Old Mar 3rd, 07, 05:05 PM
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Re: engine term

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Originally Posted by camaro nut View Post
What does it mean when an engine is bored .30 over.
300 thousands over? Big bore/short stroke.lol.Just kidding.See above for the answer.
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post #6 of 9 (permalink) Old Mar 3rd, 07, 05:18 PM
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Re: engine term

.030" = 30 thousandths of an inch

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post #7 of 9 (permalink) Old Mar 3rd, 07, 05:41 PM
 
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Smile Re: engine term

CN,

Think of it this way for LAUGH'S!!

"Poked and stroked, but I'd rather be blown"!!

Poked = bored out larger cylinders for bigger pistons to increase engine cylinder size..

Stroked = increase's the up and down piston motion to up cylinder displacement. Again, to increase cylinder size..

AND finally.....

Using a forced air power-adder to make the engine think it is bigger than it actually is b/c more air and fuel are being forced into it by some form of a supercharger/BLOWER, thus the term, "blown"..

You up the blowers pressure by about 14 psi give or take and an engine think's it is twice as big as it really is!! IF the fuel has a high enough octane to allow the engine to run right so that it stay's out of detonation??

pdq67

PS., stock Chevy examples..

The old '55 265" engine was 3.75" b x 3.00" s and they finally years later bored and stroked it stock to the '70, 400" engine's, 4.125" b x 3.75' s size....



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post #8 of 9 (permalink) Old Mar 3rd, 07, 07:57 PM
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Re: engine term

Quote:
Originally Posted by fatblock View Post
300 thousands over? Big bore/short stroke.lol.Just kidding.See above for the answer.
Quote:
Originally Posted by Beegs View Post
.030" = 30 thousandths of an inch
.30=300 thousands of an inch.Read original post.
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post #9 of 9 (permalink) Old Mar 3rd, 07, 10:44 PM
 
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Re: engine term

OK..

pdq67



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