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Old 11-11-2005, 10:41 PM   #1
THX712517
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Default Bore/stroke question

Alright, I've got the 2.2 Ecotec, I'm envious of displacement, I was thinking I would get the pistons, connecting rods, and crankshaft from a 2.4, bore the 2.2 out, and swap the parts. Only problem is, that's gonna be wicked expensive. When I ran the parts numbers, we're talking well into the four digit range. So my new question, is it worth it to bore the engine from 86 to 88 millimeters? It's a bump in displacement from 2.2 to 2.3, to be sure, and less expensive...

Before you even say anything, I don't want to hear about supercharging, turbocharging, or nitrous oxide. I am asking this question ONLY about being able to justify an increase in bore from 86mm to 88mm, increasing displacement from 2.2 to 2.3 liters.

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Old 11-11-2005, 11:12 PM   #2
twosaturns
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Default Re: Bore/stroke question

have you got that ecotec performance book? I haven't seen it, but if all I hear is true, it will tell you ALL you need to know about your mill. and maybe posting on an ecotec forum will get you better answers. you've been here long enough to know that most people here are just into the LLO.
from previous experience w/ other engines, I don't think that your slight bore increase will do much. you're still looking at a big expense (new pistons) and all that work.you'd have to stroke it and raise the comp as well, and now you have computer/emissions issues.

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Old 11-12-2005, 12:05 AM   #3
Tycho
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Default Re: Bore/stroke question

In general, usually stroking has greater benefits than boring given the same increase in displacement. It does make your rod ratio worse however.

Disadvantages of boring include: weaker sleeves, less gasket mating area, increased probability of knock (longer distance for the flame front to travel).

Disadvantages of stroking include: less favorable rod ratio, higher piston acceleration.

If you really want to look into the plusses and minuses of each I'd suggest looking at the work Intrinsic Performance Solutions has done with the Honda K series:
http://www.intrinsicperformance.com/
http://www.k20a.org/

Engines don't know "what" they are (be it Ecotec, 1.9, or K series) so restricting yourself to the "expert" opinions on ecotec would probably be short sighted. IPS has built K motors from 2.0 L all the way up to 2.65 (with variants in the 2.1, 2.2, 2.3, 2.4, and 2.6 L range) with similar heads and manifolding. They've posted a number of dynos and comments on reliability and longevity as well (I think they've gotten near every combination over 300 HP...obviously with very different characteristic torque curves). I'm sure much of it would translate over to your application.

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Old 11-12-2005, 12:19 AM   #4
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Default Re: Bore/stroke question

Cool, thanks for the info.

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