JP4/C2 Heads ???

1. WiseyVTR Frequent Poster Joined: Oct 2007 Glasgow Posts: 577 MK4 Golf GTI

   #1 1st May 2009, 20:50

   Looking at buying a 106 gti some time next week and its got a JP4 head fitted to it.
   Tbh i dont know anything about them, i have done a search but no one gives a yes or no answer.
   
   Do you need to get new/forged pistons so they dont hit/bend the valves? some people say yes others say no
   
   heres the spec if that makes any difference:
   GTI engine
   JP4 Head
   Kent pt51 cams
   
   
   Cheers
2. Ryanp Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut

   #2 1st May 2009, 20:51

   you dont need forgies with the JP4 head to run.
3. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

   #3 1st May 2009, 21:15

   why do people fit the jp4 head? does it have a smaller compression chamber hightening the compression slightly?
4. Ryanp Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut

   #4 1st May 2009, 21:17

   Quote:

   Originally Posted by blackie_2k5 why do people fit the jp4 head? does it have a smaller compression chamber hightening the compression slightly?

   Slightly bigger valves
5. TU-Tuning Saxperience Hardcore! Joined: May 2006 Bristol Posts: 16575 JP4urio, 306 DTurbo SportShed

   #5 1st May 2009, 21:20

   Oil cap doesnt leak either, minor but bit of a flaw with the J4 I know a lot of people get pissed with. How much bigger are the valves etc I dont know much about it myself
6. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

   #6 1st May 2009, 21:25

   thought it had to be something like that, nevr really looked into it, just heard a few people do it
7. WiseyVTR Frequent Poster Joined: Oct 2007 Glasgow Posts: 577 MK4 Golf GTI

   #7 2nd May 2009, 10:40

   thanks guys, so the pistons wont hit the valves
8. Ryanp Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut

   #8 2nd May 2009, 19:51

   Quote:

   Originally Posted by Ben_Saxo Oil cap doesnt leak either, minor but bit of a flaw with the J4 I know a lot of people get pissed with. How much bigger are the valves etc I dont know much about it myself

   Thats the covers though which can be fitted to a J4
9. TU-Tuning Saxperience Hardcore! Joined: May 2006 Bristol Posts: 16575 JP4urio, 306 DTurbo SportShed

   #9 2nd May 2009, 19:55

   True, like a ton on theyre own though arent they?
10. Ryanp Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut

    #10 2nd May 2009, 20:16

    Quote:

    Originally Posted by Ben_Saxo True, like a ton on theyre own though arent they?

    about 130+ inc breather pipe, the breather pipe is £30 aline
11. TU-Tuning Saxperience Hardcore! Joined: May 2006 Bristol Posts: 16575 JP4urio, 306 DTurbo SportShed

    #11 2nd May 2009, 20:22

    Bollocks, I need that lol. Will have to make my own, only need two hoses and a T piece
12. Sparco_Tom Saxperience Addict Joined: Jan 2007 Aylesbury, Bucks Posts: 12836 Yeaaahh Fiesta

    #12 2nd May 2009, 23:53

    anybody got one for sale?
13. XSARA_ROSS L-plater Joined: May 2008 South Hetton Co.Durham Posts: 35 Citroen Xsara Hdi

    #13 3rd May 2009, 10:19

    the c2 lump well the inlet valves are 2.5mm bigger,exhaust valve bigger,the head can cope better with bigger valves. just need better valve springs to cope with 280 cams etc..
14. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

    #14 3rd May 2009, 10:34

    Quote:

    Originally Posted by XSARA_ROSS the c2 lump well the inlet valves are 2.5mm bigger,exhaust valve bigger,the head can cope better with bigger valves. just need better valve springs to cope with 280 cams etc..

    I thought the exhaust valves the same size ?
15. XSARA_ROSS L-plater Joined: May 2008 South Hetton Co.Durham Posts: 35 Citroen Xsara Hdi

    #15 3rd May 2009, 11:15

    if you read PFC mag in the April issue there is a 106 with the c2 head etc.. read that says what i have just said.