Saturday, June 13, 2009

Cam failure and remedy









Not my car but Humphs Mk1 PI. Completely lost a lobe. Bit of a pain changing cams on Mk1's so out with the hole saw.

Poor old thing was a Wade 444C gound on a 3 ring Pi cam but something must have been amiss.. Kent followers and Goodparts double springs. No 1 exhaust lobe completely missing!!
Never one to miss out on an opportunity to upgrade we decided to use a experimental hybrid cam with much longer inlet duration and milder but fast opening exhaust. Do your own research ;-)
We are also using milder Jag XJ40 single valve springs which should be fine for 2.7 triumph rev limits and give less lobe loadings. They are genuine Jag parts and cost 40 pence each. Excellent value.
Timed the cam in at 108 deg max lift on inlet 1. We are alos going to use 1.55 Ratio Roller Rockers on the exhausts rather than the previous 1.65 on both inlets and exhausts.
Cam is ground by Newman on a new blank with lifter supplied by the same people.

5 Comments:

Blogger mandynadan said...

Hi andy why dont you drill two holes each side of the centre one to aid cooling it looks good
all the best ken

June 14, 2009 at 10:49 PM  
Blogger andy t said...

I think Humph might have fainted.. he was a bit precious about attacking it with a hole saw in the first place.... it was mostly filler anyway!!!

July 15, 2009 at 2:50 PM  
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