84.5mm
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Honda-Tech Member
Joined: May 2005
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From: Sun Prairie, WI, USA
81.5mm
94 gsr, the motor has been turbo'd for 13000miles now and it needs a bottom rebuild sittin at 153k. rings and compression are giving up. i was thinking about honing it to 81.5mm just to be safe as to a smooth wall to wall. i was aiming for about 400-450, will this .5mm overbore be a problem? i just plan on the following: Eagle H beam, je 9:1, acl race bearing, cometic headgasket, oem water pump, type r oil pump, toda timing belt. anything else suggested welcomed.
Modified by teddy_dc2 at 7:24 PM 9/17/2007
Modified by teddy_dc2 at 7:26 PM 9/17/2007
Modified by teddy_dc2 at 7:24 PM 9/17/2007
Modified by teddy_dc2 at 7:26 PM 9/17/2007
B*a*n*n*e*d
Joined: Apr 2006
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From: Seattle, WA, 98103
Re: 84.5mm (boostedcivicsir)
As long as your sleeved you will be okay at 84.5. I ran 84.5 for a very long time. BTW get the Golden Eagle OEM overbored gasket. Never has failed me. 
Your setup is similar to the setup I just parted out.
Your setup is similar to the setup I just parted out.
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Joined: Oct 2006
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From: Marion, N.C., U.S.
Re: 84.5mm (AMR Engineering)
if he's only running 7lbs i doubt its a sleeved block....
84.5mm bore to me is taking to much of a chance on stock sleeves.... i would just go to 81.5mm and turn up the boost a lil if your wanting more power
84.5mm bore to me is taking to much of a chance on stock sleeves.... i would just go to 81.5mm and turn up the boost a lil if your wanting more power
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From: Carbon Fiber Land, USA
Re: 84.5mm (trav95civic)
Well if you look in his sig, he has plans for sleeving the motor. So we really do not know what he is doing. That is why I stated that "as long as your sleeved you will be okay"
On the stock sleeves 81.5 is the max. I have seen people go 82mm, but I would not recommend it on the stock sleeves, especially with boost.
On the stock sleeves 81.5 is the max. I have seen people go 82mm, but I would not recommend it on the stock sleeves, especially with boost.
Man U FTW
Joined: Sep 2005
Posts: 11,973
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From: Phoenix, AZ
if you're on the stock sleeves, that'll never happen. If you're getting sleeved now, i wouldnt immediately bore it to 84.5mm because you have little room for error at that point. An 83mm bore would be a great compromise as far as performance vs re-usability (i dont think that's a word, but hey...who cares)
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From: schooling kids in ny, usa
Re: (Schister66)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Schister66 »</TD></TR><TR><TD CLASS="quote">if you're on the stock sleeves, that'll never happen. If you're getting sleeved now, i wouldnt immediately bore it to 84.5mm because you have little room for error at that point. An 83mm bore would be a great compromise as far as performance vs re-usability (i dont think that's a word, but hey...who cares)</TD></TR></TABLE>
gotta admit man, i couldnt say it better. very solid advice.
take it from me who went 81mm on aftermarket sleevves, just to go 84mm a year later. 83 i think gives you about a 1.9L and is a great place to start
gotta admit man, i couldnt say it better. very solid advice.
take it from me who went 81mm on aftermarket sleevves, just to go 84mm a year later. 83 i think gives you about a 1.9L and is a great place to start
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From: Sun Prairie, WI, USA
also the turbo i'm using is a standard turbonetics t3/to4e .57 trim, a/r: .50/.63. i read that this turbo is only good to 400whp @ about 20psi? can i get a little more but switching to a .60 compressor? i'm also planning on running 110 octane...
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