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Max Cylinder Overbore for a 2.8L by FieroJosh1993
Started on: 09-26-2013 06:15 PM
Replies: 5 (231 views)
Last post by: lou_dias on 09-27-2013 10:58 AM
FieroJosh1993
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Report this Post09-26-2013 06:15 PM Click Here to See the Profile for FieroJosh1993Click Here to Email FieroJosh1993Send a Private Message to FieroJosh1993Edit/Delete MessageReply w/QuoteDirect Link to This Post
Ok so Im at school right now and I am trying to find out what pistons to buy. I need to do .020 over to start with but I wanted to know what the max was.

Thanks
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lou_dias
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Report this Post09-26-2013 06:44 PM Click Here to See the Profile for lou_diasClick Here to Email lou_diasSend a Private Message to lou_diasEdit/Delete MessageReply w/QuoteDirect Link to This Post
well, if you wanna be a rebel, go for 94mm... when combined with a 3.31" stroke (3.1/3.4 crank), that will give you about a 3.5L displacement engine...
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Gall757
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Report this Post09-26-2013 07:17 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
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Blacktree
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Report this Post09-26-2013 08:13 PM Click Here to See the Profile for BlacktreeClick Here to visit Blacktree's HomePageClick Here to Email BlacktreeSend a Private Message to BlacktreeEdit/Delete MessageReply w/QuoteDirect Link to This Post
Maximum safe overbore is about 0.040" (i.e. 1.0mm) oversize.
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carbon
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Report this Post09-27-2013 09:06 AM Click Here to See the Profile for carbonSend a Private Message to carbonEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by lou_dias:

well, if you wanna be a rebel, go for 94mm... when combined with a 3.31" stroke (3.1/3.4 crank), that will give you about a 3.5L displacement engine...


ARI Racing used to offer a service to bore out the 2.8 block to 92mm but found that too many 2.8s had insufficient material to allow for such a large overbore. You would end up with a weak (too thin) cylinder wall or a break through during machining. They used to have an explanation on their site as to why they no longer offered the service, but it was a long time ago and its now gone completely. The biggest you can realistically go is 3.2L with the 3.1 crank or 2.9L with the 2.8 crank with the Fiero block.
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lou_dias
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Report this Post09-27-2013 10:58 AM Click Here to See the Profile for lou_diasClick Here to Email lou_diasSend a Private Message to lou_diasEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by carbon:


ARI Racing used to offer a service to bore out the 2.8 block to 92mm but found that too many 2.8s had insufficient material to allow for such a large overbore. You would end up with a weak (too thin) cylinder wall or a break through during machining. They used to have an explanation on their site as to why they no longer offered the service, but it was a long time ago and its now gone completely. The biggest you can realistically go is 3.2L with the 3.1 crank or 2.9L with the 2.8 crank with the Fiero block.


yeah, that's why I said "if you wanna be a rebel"...
I'm sure if you spend money treating the block... Better off starting with a 3X00 block...
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