Jp4 gasket in j4 engine.

1. wolf_gsxr Frequent Poster Joined: Jun 2010 wigan Posts: 778

   #1 30th November 2011, 05:06

   Cars off the road so I'm rebuilding the engine. Had an idea of usin a jp4 gasket instead of a j4 to increase the compression ratio. Question is will there be enough clearance with standard cams? I've searched but can't find anybody who's done it.
2. xsi16v Regular Poster Joined: Jan 2006 Ilkeston, Derbyshire Posts: 469 374 bhp Supercharged 205 GTI, Passat Estate

   #2 30th November 2011, 10:03

   Short answer is yes. You need to be sure that the heads not been skimmed a few times tho. Just check for clearance.
3. wolf_gsxr Frequent Poster Joined: Jun 2010 wigan Posts: 778

   #3 30th November 2011, 12:11

   Anyone noticed any gains in power or anything with the increased CR?
4. dannygti Saxperience Post Whore Joined: Feb 2006 dudley United Kingdom (England) Posts: 6790 106 gti/ SEAT LCR

   #4 30th November 2011, 12:25

   I used a jp4 gasket to get the desired compression ratio on my turbocharged engine
5. wolf_gsxr Frequent Poster Joined: Jun 2010 wigan Posts: 778

   #5 30th November 2011, 12:33

   I thought you needed low comp for a turbo? A jp4 gasket is 0.6mm.
6. dannygti Saxperience Post Whore Joined: Feb 2006 dudley United Kingdom (England) Posts: 6790 106 gti/ SEAT LCR

   #6 30th November 2011, 12:34

   Yes you are right. I used a Decomp plate and the jp4 gasket to get the right CR
7. wolf_gsxr Frequent Poster Joined: Jun 2010 wigan Posts: 778

   #7 30th November 2011, 12:59

   I'm after the opposite tho. You reckon I'd see any difference in power or many throttle responce with a higher CR ?