i have a 1995 civic cx has a gsr swap. i rebuilt the engine before i put the motor in the car. I changed all the bearings, seals, gaskets, pistons rings, timing belt, and water pump. I did use the same pistons. I got the car running, but it smoked. i drove it for atleast 800miles and it still smoked (smoke was blueish, whiteish, and blackish.....) it was running rich and i was getting bad gas mileage. compression was about 215 for all of them. So i decided to send the head to the shop. Head is at the shop now and it will be back in a week. I was looking at my cylinder walls and it had scratches vertically. most of them i could see but i could not feel it. but one of it had noticeble one where i can feel the scratch with my finger. Do i have to bore out the cylinder wall and get new pistons and new rings?


i will just make this clear, since my writing is confusing.

1, Do i have to bore out the cylinder wall and get new pistons and new rings? ( since the cylinder walls are damaged)

2, If i were to get new pistons, what is the biggest bore size you can go on stock sleeves?

3, any suggestion to what size and company pistons i should go with? type r ones are wonderful sounding, but it might be out of my budget. (all motor and high compression)

4, this is stupid question, cylinder bore and piston bore has to be the same right?

thanks for helping out.

i will get pictures soon

 

.040 is the max from honda, but i like to stop at .020 with our honduhs, which should be plenty for a scratch. if it is gouged up, it may take more.

you need to do some reading man, just by reading your post i can tell that you probably shouldn't of done all that work to an engine by yourself.

 

i didnt rebuild the motor my self. one of my friend who has been working at honda for over 10 years did most work and i learned how to do it. And i been researching, but no luck. :/

 

you might get away with a simple cylinder hone and new set of rings. you HAVE to remove the block and send it to a good machine shop so they can check/measure/hone the cylinders. if the bores are too far out of round then you need to bore it oversized (new pistons).

im pretty sure if you slap that fresh rebuild head back on you will still have smoking issues.....

good luck.

 

OP said he could FEEL a verticle scratch, a mere hone will not resolve that issue. The block will need to be bored over and new oversized pistons and rings to match. Why are people so affraid to go .01" or .25mm overbore these days. Chances are, the block is at the very least 8 years old, near 100k miles if not more. Most likely the walls are a bit our of round and tapered, .010" overbore won't hurt it if done right.

 

i dont know why its smoking tho.. this is another thread by me cause of the smoking issue. i have all my symtoms noted there. https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/rebuilt-gsr-b18c1-smoking-alot-even-after-breaking-2591098/


yea i plan bore out the block. i was looking at aftermarket pistons, but there are either too expensive or cheap ones.. i dont know if could trust them. any sugestions? i heard rs machine is decent?

 

go tell the guy at the parts counter you want "OS" P30 pistons (81.25) they are like 160 bucks. tell them they are for a 2000 SI. drop the block off at the machine shop with the pistons, tell them the piston to wall clearance and let them go to town. should be about 40 bucks a hole.

 

I feel good now paying $60 for a complete 4 cylinder overbore, hone and jet wash.

OP, yes RS Machine pistons are good.

 

i ordered the 81.5 itr rs machine piston last night so i think i will be going with that.

how do you choose how big you want your piston to wall clearance?

 

These guys seem to know what they are doing
http://www.theoldone.com/articles/en...istonfacts.htm

 

thanks for good info

 

i have heard the over sized b16 pistons are good/reliable for gsr rather than itr pistons. is that true?

 

What is your compression ratio goal?

 

I dont have a certain, goal for the ratio. but from what i understand from other people talking. itr pistons have higher compression than b16 os and itr will give me more power, but b16 os is more reliable. is that right?

 

Use this as a starting point to determine what your CR will be,
www.zealautowerkz.com
and no, ITR pistons have a lower dome than any of the B16 pistons, so they will yield a lower CR vs. B16 pistons.

 

higher compression doesnt always mean more power tho.. right? or does it. (EDIT:talking about all motor cases)

what are your suggestion on which pistons i should go with. Rs machine itr 81.5 vs b16 oversized.