Hi All,

So I take the head off the 44 86NA and this is what I see. The first pics were taken just after I lifted the head off... weird green stuff. The second set of photos show the cylinder bores. As you can see -- some scuffs, and grooves (that do catch a fingernail) and weird blotchy areas that look like corrosion. What are these splotchy areas? Any chance in H*ll that this would hold compression?

I think I know my options sleeve or bore -- but what are the real costs to fix? Can anyone tell me what, per hole, it will cost to bore out to 100.5? Why are oversize pistons so expensive? Thanks for any info.

-Dan C.

 

well im sure you COULD bore them out and put oversized pistons in there but thats only if you could find some. you could have an aftermarket company like JE make you some custom but for that price you could buy like 6 new blocks

heh

good luck

 

I think a good used engine may be cheaper. Could the green be vapourised coolant ? why did you take the head off in the first place ?

 

I pulled it due to no start condition and no compression of cyl 1.

I was hoping I could slap another headgasket on and start her up. I don't think that will work!

I just can't phathom that these blocks are almost 1 use and toss! No compute for me -- so my options are 1) toss and buy used with fingers crossed, 2) Hone/bore/lap/magic dance to 100.5 and sell my first born for ovesize pistons or 3)darton sleeve with new pistons.

Is this it?

-Dan C.

 

You can bore and sleeve if you want to keep your pistons, but I think it's best to find another block.

 

O/S pistons are so much because the demand isn't that great. Why do you think civic mods are cheap?

I'd look for a spare engine. Rebuild that and drop it in. Have a fresh motor without the hassels and for less money.

 

[scrap] it and buy a turbo.......

 

I also found suprises when I pulled my head and just bought another engine. Best choice since it reduced the cost and down time. Pistons and sleeving is far too much money to make it worth doing.

 

You can do all of the above, but with what you guys pay for used Porsche stuff in the US (Read stupidly cheap compared to the rest of us!!!) you can just get a new short block provided your head, valves, cam are also undamaged. You could also convert it to a turbo by sleeving it or just a bigger bore. It can be as cheap or expensive as you make it. Yours does look like a bit of a mess that maybe even oversized pistons won't cure? Dry sleeve it and bore it up a bit bigger as this won't cost any more than doing a stock sized rebuild.

 

I am seeing a trend here

So anyone have a spare engine or short block laying around?

Also -- anyone seen that sorta splotchy effect before -- what is that?

-Dan C.

 

This may be the answer: www.928motorsports.com/service/uschrome.html, I hope it helps.

 

make a correction: www.928motorsports.com/services/uschrome.html.

 

So -- (and I will do a search now) - the plating process allows me to use any aftermarket pistons?

Anyone use this plating process?

 

All of our engines have the block/cylinders coated with it (alusil-- nikasil) from factory.

 

Correction. the 944 blocks do not have any coatings. They are cast from high silicon content aluminum. The honing process used essentially leaves a very hard silicon layer at the cylinder wall surface.