Fourtitude.com - Help me build my 1.6L EG Heron Motor
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    1. 04-13-2017 09:58 AM #26
      But it fits in the 1.6 block without modification?

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    3. Member vwpat's Avatar
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      04-14-2017 11:21 AM #27
      1.6 and 1.7 are same bore. 1.7 has a longer stroke.

    4. 04-15-2017 09:22 AM #28
      what is this heron engine? Is that the early one with the bowled piston crowns and the flat cylinder head?

    5. Member vwpat's Avatar
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      04-15-2017 05:53 PM #29
      Quote Originally Posted by garryt View Post
      what is this heron engine? Is that the early one with the bowled piston crowns and the flat cylinder head?
      Yes. From early Euro GTI. 1.6, 9.5:1 compression, 110 HP.

    6. 04-16-2017 04:24 PM #30
      is it not a flat cylinder head on them? if so, skimming it won't do much to raise the compression. not sure about piston to head clearances on them engines, but you might get away with a thinner head gasket. failing that you might need to skim the block and pistons slightly. I would be aiming for at least 10.5-1 cr before considering fitting an uprated camshaft.

    7. Member vwpat's Avatar
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      04-17-2017 11:44 AM #31
      Quote Originally Posted by garryt View Post
      is it not a flat cylinder head on them? if so, skimming it won't do much to raise the compression. not sure about piston to head clearances on them engines, but you might get away with a thinner head gasket. failing that you might need to skim the block and pistons slightly. I would be aiming for at least 10.5-1 cr before considering fitting an uprated camshaft.
      Yes, flat head so skimming head does nothing for compression. Shave the block or thinner gasket or the correct way with new pistons.

    8. 04-17-2017 01:06 PM #32
      Would the longer stroke place the pistons too high in the cylinders at TDC, or the pistons account for that?

    9. Member vwpat's Avatar
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      04-19-2017 12:03 AM #33
      Quote Originally Posted by stereoandy78 View Post
      Would the longer stroke place the pistons too high in the cylinders at TDC, or the pistons account for that?
      Compression height is changed to compensate for the longer stroke.

    10. 05-25-2017 03:16 PM #34
      it might be possible to use the long stroke crank with the standard rods/pistons. you would need to shim the headgasket up though. if you could make it work, it would not only give you a little extra cubes, but it would also increase the compression ratio a little. you would need to break any wear ridge on the top of the cylinder bores though, as the piston rings will be going slightly higher than before.

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