Quick stroker question please help

[ItsStockOfficer]

The more you over bore, exponentially greater displacement increase...but primarily, it hugely unshrouds the valves, which can definitely lead to noticeable power gains.

 

[alqatan]

I've ordered .02 inch over, ross pistons 8.8:1 compression, thanks for the info I just tried to get my motor to 2.4 liter, It's much than enough to me if I run 2.3 liter, I thought if I bore more I would get much more power, because I've bored an NA car and I felt more power with just boring.

The Eclipse might be different, anyway thanks for the info, I need some help with my tranny, I got a new problem with it, please search for alqatan and you'll see my last post about tranny

 

[Kevin Jewer]

Just a quick comparison... The increase in stroke is ~15% change in displacement. Going .020 over on the bore is ~1%. Its all in the stroke

 

[ItsStockOfficer]

Just a quick comparison... The increase in stroke is ~15% change in displacement. Going .020 over on the bore is ~1%. Its all in the stroke

For displacement....for deshrouding valves, 60 over is a ton! It's still not a crucial step by any means, but if you have the right block, it's nice.

 

[LaserDad91]

Ran across these sites yesterday, just thought I would pass them along. As for all the discussion on bore and stroke and displacement, just do the math, as someone else has already stated.

4G64 FAQS.

http://www.4g64.150m.com/faq.html

4G64 PROJECT CAR.

http://www.carotica.com/4g64/

As was previously stated, the 0.060 (1.524mm) overbore does bring the 4G63 to almost the same bore as the 4G64. The 4G64 is at 86.5 mm X 100 mm (stroke), as compared to the 4G63, 85mm X 88 mm (stroke). (Ref. http://4g64.150m.com/turbo.html ) It also stated the 1994 Galent came with DOHC, but the head intakes are smaller than the 4G63.

So, why mess with the 4G63 block at all? Would the 4G64 block mount up in our DSM’s? You would have to change the rods/pistons to account for the 4G63 head, but, if you had a good block, you could save $$ on machining work.

Looks like it would be a neat project for us N.A. guys, and I am sure it has been done! Does anyone have any dyno info on a N.A motor of this configuration?