just picked up a block and i'm wondering what u guys think about this gash. do u think it might come out in a hone or would it need to be bored 85.5?

either way, what are a good rod and piston combo to run for turbo thinking ~20psi at the most. also i have a b17a1 complete i'm running in a 91 crx si that uses the b16 head. skunk2 sound good for turbo on this head w/ b18c1?

pics:

http://s135.photobucket.com/albums/q...b18c1%20block/

 

up

 

Probably its not that big. Just take it to a machine shop and see what they say. Thats really the best way to find out.

 

85MM is really big for a turbo set up and many say not to go that big.

 

I would guess and say this originally was a 84.5mm dart block and not the 81.5mm. Like everyone said the check it out with a machinist and see what they say. If not mistaken I've seen someone running around with an 86mm dart block but to be sure just call up dart and see how much you can take out of the cylinder wall.

 

thanks..yeah i was thinking 85 was kinda big for turbo, but it might even need to be 85.5 if that gash doesn't hone out. i will see what dart says.

 

apparently, it looks to be a DARTON sleeved block..not dart? I'm trying to find info on this block, and figure out what I can do with it..so if anyone knows what it is, or has any suggestions please let me know..here is a pic of a DARTON sleeved block, which looks pretty much like my block but much more clean!

http://www.justiceracingengines.com/...%20pistons.jpg

 

after e-mailing dart, and successfully identifying the sleeves as DARTON sleeves, I e-mailed DARTON and this is what they said:

"From the pictures it may not clean up at 85.5mm. If you do bore it out that large you would need to make sure you have it done by a very good machine shop. At that bore they need to be right on center. If they are not they will break through to the o-rings at the lower portion of the sleeve.



The part number would be either a 400-130 or 400-140 kit depending on what bore size they started with. Let me know if you have any more questions."

This is very useful information, because now when I go to a machine shop I can have them guarantee they do not penetrate the o-rings!

here are the specs on the sleeves:

Bore: 3.298
O.D.: 3.750
Wall: 0.285
Length: 5.500
Flange (Thickness): 0.500
Flange (Diameter): 4.626

 

"The sleeves will more than likely be able to handle that amount of boost easily. The problem you get into with making a daily driver at that bore size is with the head gasket. When you go that large due to the bore center of the block you do not leave a lot of room for the head gasket to seal. You will have an issue with this before you would with the sleeve. I would not generally recommend going that large with a street driven vehicle."

so do u guys think if I get a really good head gasket, that would solve one of my problems? if so, what would u recommend for a bigger bore?

 

"We primarily use Cometic. Just make sure to use a little copper coat on it and make sure after the first heat cycle of the engine you re-torque the head."

All my questions are answered for now..

thanks guys.