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19th January 2011, 21:46
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#1
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Established Member
Join Date: Oct 2008
Location: leeds
Posts: 2,430
Car(s): 05' Clio 182
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jp4 or just jp4 head?
is is worth swapping the S engine for the JP4?
i have been looking at jp4 heads but i have been told something silly like: you need the block aswell as they use high comp pistons? and if you use a jp4 head will loose compression?
what are the right comments on this? options?
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Quote:
Originally Posted by Peter_D
Theres a simple and effective solution to this, i'm not gonna tell you what it is but i'll give you a clue.. It begins with "R" and ends in "APE"
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Quote:
Originally Posted by Lacey_106
Had a good time though, I think! Enjoyed that vibrator!
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19th January 2011, 21:48
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#2
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Saxperience Hardcore!
Join Date: Nov 2007
Location: Guantanamo Bay
Posts: 28,700
Car(s): oyster card
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Why do you want a JP4 if its for lower miles and just a standard replacment then may aswell do the whole engine with all the neccesary parts to enable it to work.
If you are going for power then id stick to a full J4 engine, rebuild with larger valves if you like etc.
If you really want a JP4 head then jus get the head but you cant go as wild as easily as on the J4 engine.
Basically!
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19th January 2011, 22:05
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#3
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Established Member
Join Date: Apr 2006
Location: torquay (England)
Posts: 1,993
Car(s): supercharged vts. 1.1 saxo. accord type r
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the jp4 valves are bigger but u will need the j4 springs followers collets etc to keep the strength, also the j4 vernier pulleys.
the j4 has a stronger bottom end aswell so i would keep that.
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vts, the futures bright the futures boost
Quote:
Originally Posted by sliderz
your car wipes mine out , any day . looking good
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Quote:
Originally Posted by Sophia_Bush
lady charger ftw in this case
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20th January 2011, 19:37
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#4
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Established Member
Join Date: Oct 2008
Location: leeds
Posts: 2,430
Car(s): 05' Clio 182
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Well I'm converting my r engine going to be camming and mapping the engine and was thinking about power gains of the jp4 over all
__________________
Quote:
Originally Posted by Peter_D
Theres a simple and effective solution to this, i'm not gonna tell you what it is but i'll give you a clue.. It begins with "R" and ends in "APE"
|
Quote:
Originally Posted by Lacey_106
Had a good time though, I think! Enjoyed that vibrator!
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20th January 2011, 22:07
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#5
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Frequent Poster
Join Date: Jan 2009
Location: isle of bute
Posts: 585
Car(s): project saxo vts,
escort gti,
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ive got alot of the parts you might be after mate. j4 valve springs etc.
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21st January 2011, 10:38
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#6
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Established Member
Join Date: Oct 2008
Location: leeds
Posts: 2,430
Car(s): 05' Clio 182
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I have everything I would need for a j4 convert but I was wondering if it's worth using a jp4 head for the valves or a full jp4 engine for hi comp pistons
__________________
Quote:
Originally Posted by Peter_D
Theres a simple and effective solution to this, i'm not gonna tell you what it is but i'll give you a clue.. It begins with "R" and ends in "APE"
|
Quote:
Originally Posted by Lacey_106
Had a good time though, I think! Enjoyed that vibrator!
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21st January 2011, 16:22
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#7
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Saxperience Forum Bum
Join Date: Jan 2003
Location: Scotland
Posts: 3,380
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jp4 engine does not hahave fully floaitng rods ,thats the other main dif ,but if going mega power +revs you will want forged rods as well
forged rods + pistons from £750+ vat
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owner of GMC motorsport 01671404030/01671403699
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