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bored out 258 |
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79limitedpacerwagon 
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Joined: Jan/24/2010 Location: Macomb, MI Status: Offline Points: 316 |
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 Topic: bored out 258Posted: Mar/21/2010 at 1:05pm |
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can a 4.2 be bored out to a 5.0 without the cylinder walls being too small or is that too big? how much over would that be and is it possible to find pistons for it?
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1979 AMC Pacer Wagon Limited inline 258 4.2L - Prjct/DD
1973 Ford Gran Torino 351C 5.8L - P 1992 25th Anni Camaro RS 305 TBI 2001 Ford Expedition 5.4 Triton V8 AWD 4X4 2009 Ford Racing Focus SES |
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purple72Gremlin
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Posted: Mar/21/2010 at 1:09pm |
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Hope you are joking. 5.0 is roughly 302-304-305 cubic inches...............there is no way you could bore a 258....that far...........but you sure are welcome to try. think a 30 over 4.0 with a 258 crank is a 4.6L............or 281 cubic inches....................the 4.0 has a bigger bore than the 258/4.2.................The 4.0 is 242 ci in stock form.
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TinMan
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Posted: Mar/21/2010 at 1:36pm |
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If you're reading about an AMC six cylinder 5.0L, it's a stroker using
the 4.0L block. It's a very expensive stroker build.
Boring a motor out isn't a great way to make displacement, stroking it is...and even then, only to a certain extent unless your wallet is fat. |
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79limitedpacerwagon
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Joined: Jan/24/2010 Location: Macomb, MI Status: Offline Points: 316 |
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Posted: Mar/21/2010 at 1:49pm |
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can the 258 be bored out at all? werent the mexicans 282 4.6L AMCs a bored out 258?
Edited by 79limitedpacerwagon - Mar/21/2010 at 1:56pm |
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1979 AMC Pacer Wagon Limited inline 258 4.2L - Prjct/DD
1973 Ford Gran Torino 351C 5.8L - P 1992 25th Anni Camaro RS 305 TBI 2001 Ford Expedition 5.4 Triton V8 AWD 4X4 2009 Ford Racing Focus SES |
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poormansMACHINE
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Posted: Mar/21/2010 at 1:51pm |
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About .060". Not enough to make any appreciable difference. It would get you up to around 266 inch. What was the intended goal? Edited by poormansMACHINE - Mar/21/2010 at 1:52pm |
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79limitedpacerwagon
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Posted: Mar/21/2010 at 1:54pm |
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it wasnt to gain really any power but if my cylinder walls are scratched i needed a way too keep my block, and it would have to be bored out a little, and if i was going to bore it out i figured i might as well find out how big it could go.
i decided to keep the car numbers matching and just use bolt ons to make it a bit faster but i decided i just want a cool cruiser with hopefully about 150-180hp, i just want to really pull my engine to really clean it up, do a rebuild, and have a nice looking clean engine under the hood instead of the mess thats in there now Edited by 79limitedpacerwagon - Mar/21/2010 at 2:00pm |
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1979 AMC Pacer Wagon Limited inline 258 4.2L - Prjct/DD
1973 Ford Gran Torino 351C 5.8L - P 1992 25th Anni Camaro RS 305 TBI 2001 Ford Expedition 5.4 Triton V8 AWD 4X4 2009 Ford Racing Focus SES |
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tyrodtom
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Posted: Mar/21/2010 at 2:02pm |
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Of course it can, .030-.040 probably safely, I haven'y done the exact arithmatic, but that would give you maybe 6 more cubic inches on .040. So maybe 4-5 more HP, from the added displacement, if you're lucky.
You usually gain more power from the improved ring seal on the straight cylinder walls than you do from the added displacement. If you've got a engine with good compression already, Boring it out for the added power is tremendously wasteful, you're spending about $100 for each hp you'll gain.
The Mexican engine has a completely different block, even a bigger bore that a 4.0, then it has a 258 crank.
Edited by tyrodtom - Mar/21/2010 at 2:05pm |
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66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va.
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TinMan
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Posted: Mar/21/2010 at 2:02pm |
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4.2L's aren't all that hard to find, if the engine runs fine I'd just keep running it if I were you. Or pick up another 4.2L from a Jeep and rebuild it on the side.
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79limitedpacerwagon
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Posted: Mar/21/2010 at 2:05pm |
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ill keep the ring seal in mind, mabey ill just do hardened pistons and run methanol injection  with a 4.0 headEdited by 79limitedpacerwagon - Mar/21/2010 at 2:06pm |
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1979 AMC Pacer Wagon Limited inline 258 4.2L - Prjct/DD
1973 Ford Gran Torino 351C 5.8L - P 1992 25th Anni Camaro RS 305 TBI 2001 Ford Expedition 5.4 Triton V8 AWD 4X4 2009 Ford Racing Focus SES |
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purple72Gremlin
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Posted: Mar/21/2010 at 2:11pm |
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79limitedpacerwagon wrote: