.080 overbore with 2.3 stroker

[jdombrow]

looking at getting a 2.3 stroker kit which is actually only 2270 cc thinking of going .080 over which brings me upto 2378 cc wondering who else has done this or how its holding up

 

[ptownracer]

really depends on what u wanna do with your car.... full blown race car it should be fine as long as u dont plan on boosting 40psi... the only other issue u will run into is the more u over bore the cylinder walls the closer the piston and rings are to the water jacket which weakens the integrity of the block causing flex and heat will build up alot easier because of the thin walls ... if u plan on building a weekend warrior and a daily driver i wouldnt recomend boring this much my car is .030 over and i only run about 180 but its your build i just have my opinions



p_townracer
"BOOSTN"

 

[Burnett03]

.080 overbore is far to much on these motors. You risk cracking the cylinder walls or making the car run hot. The small amount you gain in displacement with that overbore isn't worth it at all.

 

[Black94DSM]

You will not notice the difference in power from standard .020 over to your .080 that you want to do.

Like already stated, just do the smallest cleanup you can on the block, that way if you do have a mishap you might be able to save your block and bore it again.

 

[DSM_PWR]

.080 bore?? wow... risky

 

[D_Thirteen]

yeah why would you want to over bore that much, that is far too risky. I would much rather do away with the 2.3 and just put in the 4g64 block w/ crank and bolt the 4g63 turbo head on. doing this will give you a true 2.4l which gives you about 20 % more power over stock set up. then from there go and do your bolt ons. just my opinion though.

 

[Mobile_DSM]

I would think that overheating would be an issue boring the motor that much. The cylinder walls would be too thin.

 

[jdombrow]

4g64 block = .60 overbore on a 4g63.

theres no difference between a 4g64 and 4g63 besides deck height, and the deck height isnt needed if using the 100mm crank if used in a stroker build its the same as using a .60 overbored 4g63

 

[gorf]

Correct me if I am wrong...

A 2.0 with a 100mm 2.4 crank and stock piston is considered a 2.3.

A 2.0 same crank and .040 overbore is considered a 2.4.....

 

[jdombrow]

the standard bore is 85.5mm per cylinder its about 1997cc's the .040 over makes it more around 2050ish, i cant find the thread on displacement, the stroker adds stroke, piston travels farther up and farther down adding the extra .4 liters

 

[JEFFREYCASTGSX]

4g64 block = .60 overbore on a 4g63.

theres no difference between a 4g64 and 4g63 besides deck height, and the deck height isnt needed if using the 100mm crank if used in a stroker build its the same as using a .60 overbored 4g63

The difference is the deck is taller which allows for more room to stroke, meaning a crank with more stroke, the reason why a 64 crank in a 63 crank isnt 2.4(just a 2.3) is that the piston is moved down, it still utilitizes the same 4g63 rods, but really the stroke is where the extra .4l comes from. You cant just bore the block to get an extra .4l. And even then the powerband for both motors would be different, and the 64 would still have the advantage.

 

[jdombrow]

i typed that wrong, as far as using the 4g64 block there is slightly less sideloading, i was talking about using a 6 bolt 4g63 block with a 100mm crank and a .080 bore to hit 2378cc;s of displacemtn, the 4g64 with stock bore isnt even a real 2.4 its more like a 2.3 its just labeled a 2.4 because thats what mitsu called it