I have a d16a6 here , crank is off at the machine shop for 7 days so heres what I am pondering I had this block honed for my 75mm vitaras , it was majorly rusty when I got it , got it back and had a great crosshatch and a few pits he could not get out. but still it was very smooth. but now Some misture has found its way in once again.... ughhh... and now there is a bad rust spot and i have sanded it with 2000 grit to make it smooth out but now I am worried about causing ring/piston damage , I am hoping you guys will be able to tell me if I should just smooth everything out real nice and slap em in and go , or should I just buy some 79mm vitaras and bore it out? I am going with a gt28r btw. heres the pics

 

if you got red x's like me go to this link

http://img189.imageshack.us/gal.php?g=pistonwall001.jpg

thanks guys

 

79mm? hope thats a typo.

id let the machine shop decide and if anything worse case scenario you bore out to 75.5 and run 75.5 vitaras. that will also give you a tighter PTW clearance and you will love it.

 

actually meant 76 but yeah you get the idea. I asked the machine shop and hes the one who said use sandpaper but I wanna know from you guys if you would use it on your build because I dont wanna do all this work to pop a ring or fry a piston.

 

Here's a non noob answer from a noob guy (I don't do forums usually).

Pitting in the walls is not acceptable in any race motor I build. If it doesn't clean up at 75mm then go to 75.5mm and so on, or find a new block. I know this is probably still just a street motor but its pretty terrible to do that to your rings.

I would personally find a different machine shop and have it bored to the next size up from where you are and get different pistons. No machine shop I would personally trust with any of my motors would ever tell me to take sandpaper to the bores. That's asking for major blow by as the piston moves down the bore.

When storing machined blocks/parts I usually soak (spray with multiple cans) them once a week in WD40/PB Blaster and keep them sealed in a bag. That keeps off surface rust and keeps most of the crap out of it. They still occasionally need a cleaning before being assembled but that depends on how long it sat.

 

yeah i've had my head off of my block for like the last two weeks and the first thing i did after i cleaned it all off was spray a ton of wd40 onto my cylinder walls and pinstons and everything just to keep rust away

 

Word.


75.5mm supertech FTW!~~!~~!