Hi I'm looking for a bit of information here , last night me and a friend started a tear down on a motor that was in his DA integra . He had the car for about six months before the timing belt jumped due to improper tensioning ,(it ran great this I tire time) all the while he had been building his turbo gsr setup so when it went bang we desided to use the the block for an ls vtec build. After we pulled the head off tho to our surprise the Pistons read p3r which is a B20 piston and we found that it had been bored over to a 2.0L ,

My question is how do I tell if this block will sustain close too 200 HP what are the differences between the b18 and b20 factory cylinder sleeving and will I have to sleeve it with after market sleeves to have a semi reliable build

Thank you tons looking forward to a response

 

Can you post pics of the sleeves? I didn't think boring stock b18 sleeves to 84mm was possible without aftermarket sleeves.
Your friend didn't know his block was sleeved?

 

Did you actually measure the bores or are you going solely off of the piston markings?

P3F is a low compression B20 piston - 84 or 84.25mm
PR3 is a B16 piston and should have a pretty significant dome on it - 81 or 81.25mm

I have no idea what a P3R is, it's nothing USDM afaik.

(Google says ~1998 City?)

If it's actually been bored to 84mm or more, it's junk unless you sleeve it.

 

P3f is what I meant sorry , and yea my friend was driving the car for over 6 months and had no idea it was anything other than the JDM b18b it was sold to him as , I'll take a picture of the sleeves after work tomorrow I wasn't sure weather it was stock or not it would b a very pleasant surprise if someone had done the job properly

 

Yea he had no idea I'll take pics tomorrow after work

 

P3f yes sorry and yes we measured the bore after we saw the piston , do you think it would have ran all this time without having been sleeved?!?

 

Take pics of the sleeves, the stamp on the front of thr block, and also the raised casting stamp on the back of the block about 6 inches below the thermostat housing.

My bet is that it is just a stock b20 that someone changed/tampered the stampings on. Who would sleeve a b18 to 84mm and put stock p3f pistons in it??

 

That's what I was thinking.

 

You sir are right on the money I just came to the same conclusion decided to check the stamps after inspecting the sleeves closer and finding they look exactly like stock b20 , the ******* 8 on b18 was even upside down on the front stamp >

 

Nice surprise tho.