Saturday, September 05, 2009

New Bits for White PI Part 1 .. Strip down

Reground TR5 cam using hybrid inlet / exhaust cam profile. Inlet is longer duration than exhaust and seems to give big torque and bhp. Tuftrided.
Excellent cheap alternative to most Triumph tuning junk. XJ40 valve springs. Cost peanuts and very adequate for Triumph cams and valves

New GT inlet and exhaust performance valves. Nitrided steel and stellite tips and exhaust valve seats

I have decided to freshen up the top end of my White Mk1 PI as it seems a bit down on top end power compared to Humph's freshly built PI.
Head off for the first time in seven years

I have got a new hybrid camshaft very similar to my mate Humph to try + some new Gareth Thomas valves to build into different head and a set of hybrid Goodparts Roller Rockers of 1.65 Inlet and 1.55 exhaust compared to my current 1.65:1 ratio set.
Flowed head running 10.75:1 CR and Chris Witor Big valves ... probably keep this complete but probably wont be using it on The White thing again

I will also be using the recently discovered mod of Jag XJ40 springs which look very good quality - are not too hard on cam lobes and cost the princely some of about 80p each from Jag Genuine Parts!!!
Buggered cam folowers... guess the cam (Wade 444C) will be a bit secondhand too judging be the look of these.


Stripping down the head from the Pi for the first time in about 7 years was a fairly easy process. Got it all off in about an hour. First suprise was that the rather crap Racetoration stainless head nuts were almost finger tight, certainly no more than 45lb ft so they will be consigned to the bin. Obviously have lost their torque and Stanparts finest will be going back on... what was I thinking back in 2002!!!!
The head slipped off easily revealing a mint set of bores... nice suprise considering the revs and abuse this engine gets. No scoring or ridges at all and honing cross hatch still easily visible.

Considering the lack of torque on the head the gasket looked perfect with no sign of any overheating or blowing. Not suprising really as it it was running really well apart from missing a second from it's ultimate lap time.

Whipped out the cam followers and the first sign of wear. 4 or 5 showed serious signs of surface hardening picking up so I expect the cam to be fairly secondhand once I get it out tommorrow.


Looks like the new cam might have more effect that I had hoped for .... EXCELLENT......

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