17-10-2015, 07:56 AM
(17-10-2015, 05:37 AM)japie Wrote: If I didn't want to share I wouldn't start posting about it, maybe some moderator can change the name of this threat?
We use the 8 valve head since our rulebook has that as max.
The Pipercam Ultimate Road camshaft.
30% stiffer valve springs, also 50% available. (https://www.facebook.com/hartmut.henkel)
The hydraulic studs aren't a big issue in general most car tuners, freaks and gods will say that above the 7K rpm hydraulics will fail but most of that knowledge is based on "followers" like used in VW and most engines and that is not the same system as PSA use.
Well to compensate for the loss due to higher spring pressure we modify the oil pressure regulator in the cylinder head.
It's an allen key placed left-bottom of the head when looking at the manifolds inside a spring and a ball, drill out the spring (without damaging) in a lathe with a 6.5mm and put M8 in it, put a headless M8 bold in the lathe and remodel the nose so it will fit inside the spring, screw it all together with anti-leak and start adjusting the pressure.
Original it is at 2bar and we boost it to 3bar so we compensate for the valve springs and a bit extra because we can... ;-)
Very helpful stuff, I'll be in touch about valve springs soon no doubt! Any chance of some pictures of the modified pressure regulator?
Welding and fabrication projects undertaken, contact me for more information.
