Why the JP4 head? - Saxperience - Citroen Saxo Forum

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Why the JP4 head?

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Saxo Engine/Performance If you're interested in tuning Saxo engines, or if you need to know something which is engine related... this is the place for you.

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1st May 2012, 11:43	#1
Loz2212 Infrequent Poster Join Date: Dec 2011 Location: Bingley, West Yorkshire Posts: 190 Car(s): GTI-6, Icelandic VTS	Why the JP4 head? What are the advantages of fitting them? Thanks

1st May 2012, 11:59	#2
qrty Saxperience Forum Bum Join Date: Feb 2007 Posts: 3,068 iTrader Score: 19 (100%)	The JP4 head has bigger valves than the J4 head! Usually people run J4 cams and springs in the JP4 head but problems can be had when fitting J4 performance cams due to valve clearance!

1st May 2012, 12:05	#3
Loz2212 Infrequent Poster Join Date: Dec 2011 Location: Bingley, West Yorkshire Posts: 190 Car(s): GTI-6, Icelandic VTS	Will that produce more BHP N/A? Or are they something to consider with turbo's?

1st May 2012, 12:31	#4
qrty Saxperience Forum Bum Join Date: Feb 2007 Posts: 3,068 iTrader Score: 19 (100%)	Depends on other factors! Some dyno graphs used to be knocking around from a car that had a J4 head swapped to a JP4 but the internals were swapped to J4! Pretty sure the results were positive but I don't think there was a massive difference! Better results N/A would probably be had if using different cams but as I said you can encounter problems with valve clearance! Not sure about using them with turbos!

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