Difference between jp4 and jp4s?

1. GT500FTW L-plater Joined: Aug 2010 Perth, Scotland Posts: 69 Citroen Saxo VTR, Citroen AX, Mercedes 190, Honda

   #1 31st December 2010, 01:12

   As far as i can tell thru searching, the s version has an aluminium inlet and a higher rev range.
   Is this all?
   In theory I'll be changinag the inlet to a J4 anyway, and once i change over the head internals, and fitted some ph3s it will be getting mapped.
   
   Anything else im missing?
   Valve-piston clearance with the ph3s alright?
2. user_38486 Saxperience Forum Bum Joined: Oct 2009 Blackburn Posts: 4739 A few

   #2 31st December 2010, 01:35

   iirc the only difference is the inlet, and cams. As you are camming it, and using the J4 inlet, I cant see there being a difference
3. GT500FTW L-plater Joined: Aug 2010 Perth, Scotland Posts: 69 Citroen Saxo VTR, Citroen AX, Mercedes 190, Honda

   #3 31st December 2010, 01:38

   Excellent. So no point in searching for a rare jp4s then, when a jp4 will do the job
4. user_38486 Saxperience Forum Bum Joined: Oct 2009 Blackburn Posts: 4739 A few

   #4 31st December 2010, 01:43

   Not really mate. IIRC the TU5JP4S was the 1 used in the C2 VTS and the TU5JP4 was used in the 207 etc.
   They are basically the same engine iirc, with just the few little bits like the inlet etc...which will be changed anyway
   
   
   Ill double check when im slightly more awake tomorrow for you though mate...dont wanna lead you down wrong path.

   1 user thanked this post: GT500FTW
5. GT500FTW L-plater Joined: Aug 2010 Perth, Scotland Posts: 69 Citroen Saxo VTR, Citroen AX, Mercedes 190, Honda

   #5 31st December 2010, 01:47

   Cheers mate.
6. Boyes Regular Poster Joined: Apr 2008 Sheffield Posts: 276 Peugeot 106 GTi, Clio 172

   #6 31st December 2010, 17:03

   JP4s I beleive has pocketed pistons for the wilder cam like J4's and slightly stronger, but they are much rarer and more pricey obviously.