1.5 head on 1.6 block

[Baselyne]

In reverse of this thread http://vwdiesel.net/phpBB/viewtopic.php?t=12505


heads mechanical

blocks hydro

what would you say is the chance of getting this to work?

I figure using some parts from 1.5 and some from 1.6 to make the pump  work?

wouldnt the oil squirters still be cooling the piston rings?

which head gasket i wonder? I suppose the head would need drilled to fit 12 mm bolts.?

[Baselyne]

does this not work or?  Imagine you were a newbee and just wanted to know what was avalible as far as options go

[saurkraut]

The 1.5 and 1.6 blocks have the same bore. The difference is in stroke.  The 1.5 has a shorter stroke.  I believe the 1.5 also had a half a point higher compression ratio.

Therefore, the 1.5 head has smaller swirl chambers.  If you put it on a 1.6 block, you'll have even higher compression.  Probably a really bad idea if you want to run more than stock boost.

How about a 1.6 head on a 1.6 block, and a 1.5 head on a 1.5 block.

[saurkraut]

There's some on-line info at various sites that has bore, stroke and CR for the VW IDI engines.  I have one in a word document that I copied off the internets.  I'm not smart enough to successfully cut and paste it here.

A long time ago, I worked the bore, stroke, and CR stuff backwards and came up with these BALL PARK numbers for the swirl chamber volume differences.  I have all these heads in my garage, and a burette, and sometime I will actually measure them with an injector, heat shield, and glow plug in the hole  They are GENERALLY right and good enough my plans, which inclued a frakinmotor this spring.  This will yield an extra 1.6 head, and guess where I was thinking of putting that head.

1.5 Swirl chamber volume 11.457 cc

1.6 Swirl chamber volume 12.794 cc

1.9 Swirl chamber volume 16.376 cc

1.6 with 1.9 head CR: 19.357

1.5 with 1.6 head CR: 21.371