Using a jp4 engine

1. Mathias Saxperience Post Whore Joined: Mar 2008 Pembrokeshire Posts: 5598

   #1 5th April 2012, 10:30

   Am I right in saying when using a jp4 head, if wanting to run j4 performance cams then you'll need to change the internals of the head to j4?
   
   What bits need transferring over from j4 into jp4 head?
   
   Also with the jp4 bottom end can I use the j4 alternator setup?
2. user_9396 Established Member Joined: Apr 2006 torquay (England) Posts: 1993 supercharged vts. 1.1 saxo. accord type r

   #2 5th April 2012, 23:41

   from what i gaver and im about to do,
   u take the j4 springs, caps and collets, j4 cams and pulleys.
   and followers, everything else jp4
3. Mathias Saxperience Post Whore Joined: Mar 2008 Pembrokeshire Posts: 5598

   #3 6th April 2012, 00:11

   think thats what im going to do also, however i think that the valve clearance when running a jp4 bottom end is too close so i may have to have a re-think
   
   either get the jp4 pistons modified or use a j4 bottom end i suppose
4. Mike_Roberts Infrequent Poster Joined: Dec 2009 Oswestry / Lyneham Posts: 180 1993 106 XSI 1.4 miami 2005 Fiesta mk6

   #4 6th April 2012, 09:53

   I think part of the clearance issue is the fact the JP4 uses a thinner headgasket. I think you can just run a J4 gasket. Lose abit of compression but gain in having better cams.