Engine Specific Info and Questions > IDI Engine

Piston height. What would you do?

<< < (3/3)

fatmobile:
 I did mark the block with piston height in magic marker on the surface.
 So he just got it turned around in his mind.
 I think he registered it as that side of the block was too high,... instead of the piston being too high.

 Luckily it didn't ruin the block,.. and he did take off as much as I told him to.
 But like I posted earlier I was thinking the goal was .027
 Thats the minimum, we should be aiming more towards .031.
 So he should get it right the second time,.. and get us above .026.

 Moving the pistons and seeing the height change shows the deck is slightly sloped.
 At first near .0035 higher on one end,  now .005 toward the other.

 The block didn't suffer a tragic death either. From an '84 Rabbit.
 The previous owner did put another head on it but there were no new machine marks on the deck surface.
 There were big ridges at the top of the cylinders, with stock pistons that had no valve marks.
 It died because they didn't adjust the valve right and it was staying open enough to fill the exhaust with carbon:
4bluecarbon4clyexhaust by vwfatmobile, on Flickr
It was worse but some carbon fell off.


Runningwild: I'm trying to think which engine these rods came from.
 They were in my VNT Rabbit until the block cracked.
 I think they were from an '85 Jetta TD that never suffered a catastrophic failure,just wore out.
 I haven't checked them for straightness but my old shop had some great guys.
  Damn, I wish they hadn't sold the place and retired.
 They balanced the rods, pressed the bushings in and reamed them.
 They would have noticed.  They checked them for round and they were fine.
 They were the first ones to suggest checking the height and making the deck match the pistons, on a different engine.

fatmobile:
 I swapped rods on the 2 end pistons and the height stayed with the pistons.
 So it isn't the rods.
 Kolbenshmidt.

 Took it back today and we marked how much to take each end down to, right on the deck.

Navigation

[0] Message Index

[*] Previous page