WTB: oversize pistons for a cy code 1.6 td 030

[Rabbit on Roids]

If it aint broke don't fix it.  The bores still had cross hatching when I got the block, to me that means that the bores are still good, but that's just me.  I am trying to avoid all of the machining that I can, i'ts a pain to keep taking it back to the machinist and hear his I-told-you-so speech again and again   No, but seriously, the bores are fine, why mess up a good thing?  I have to buy pistons regardless why spend the extra 100 bones if I don't have to time will tell, I'll find out tomorrow, completely forgot about it today.  I'll be sure to take some pics too.

cross hatches or not, i pulled my last 1.5 apart (single owner, never been taken apart, EVER) and it had 125k miles on it, and the bores still had cross hatching in them, and only a slight lip. there was still cross hatching in those cylinders too, so im sure your cross hatching is old also. i just wouldnt half ass the pistons/bores. but if you drop your new pistons in, and there at .001" spec, then run it, but if its any looser, i would bore it and go over size. i just dont see why you are gonna skimp on such an important step (in my eyes) and you are willing to splurge on such un-important things such as a complete aftermarket oil system. i think i would rather bore the block, than go with the oil system if it were me, and if i were on a limited budget. i just dont get your method of thinking sometimes is all...

when i built my last engine, no, i did not bore it. but, it has a piston and rod out of a completely different engine. and the bottom of the bore is broken. it still runs great, but i can tell its not right. it has a cold miss that goes away, and uses some oil, more than i would like. by not boring your engine, you are just asking for lots of blow by, and an engine that burns plenty of oil.

i just wouldnt take the chance unless its still at stock VW spec (or atleast super close for piston to cylinder wall clearance.

[NintendoKD]

I'm not on a budget build per-se, just frugal "the mods don't like it when I use a certain ethnic word, even though I am one"   I will spec it out for sure.

[NintendoKD]

76.98 thats oversize, and that is what I need

[rabbid79]

Brand new Kolbenschmidt 76.98 turbo pistons is what I have.  Stamped right across the top of the piston.

[Rabbit on Roids]

76.98 thats oversize, and that is what I need

whats your bore mic out at? have you checked yet? how tapered are the bores? how is the ridge at the top of the bore?

[NintendoKD]

hold on, I have to dig up the ol mic

[NintendoKD]

Ok, I have a set of calipers, best reading I can get says 76.92, what is the best way to get an accurate reading?  or am I using the wrong tool for the job?

[NintendoKD]

There is absolutely no ridge at the top of the bore, just to be clear.  I gotta be doing something wrong when measuring, it is a digital set of calipers, and yes, I zeroized and calibrated them properly before use.

[Vincent Waldon]

Are you using bore gauges?

This style lets you use a dial caliper:

http://cgi.ebay.com/ebaymotors/NEW-TELESCOPING-GAUGE-SET-inside-bore-measuring-tools_W0QQitemZ370334514951QQcmdZViewItemQQptZMotors_Automotive_Tools?hash=item5639a83f07

This style has the gauge built-in:

http://cgi.ebay.com/ebaymotors/PRECISION-ENGINE-CYLINDER-HOLE-DIAL-BORE-GAUGE-GAGE-SET_W0QQitemZ370339278224QQcmdZViewItemQQptZMotors_Automotive_Tools?hash=item5639f0ed90


The idea is to take a series of readings in several directions at 3 or more depths on the bore... giving you an accurate picture of mean diameter, taper, etc.

[NintendoKD]

so in other words, I need to get my machinist to do it for me.... 80 bucks for a guage is not what I was expecting   Thanks Vince, I'll figure something out.  I want to do this myself, but it seems that that may not be the case.

[Vincent Waldon]

Probably a good idea.  They are an acquired skill to use as well... in terms of repeatability.... for a one-off handing it off to a guy that does this for a living might make sense.

I have a set but I mostly use them to predict how bad the news from the machinist is likely to be.   

[NintendoKD]

I'll know wed evening   be worried till then