se7ensport
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| posted on 7/7/07 at 05:33 PM |
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Valve adjustment on KcFR 33 Pinto
Thought I'd adjust the valves (mistaken impression they needed it!), anyway I set them .010"/.012" inlet/exhaust measuring between
the rocker arm and the cam when the lobe is furthest away. It didn't work 
The details I have for my cam are: 3000-7500rpm .460" LIFT 300/297deg TIMING 105deg .010"/.012" CLEARANCE
I've clearly got something wrong as it's down on power and doesn't sound raspy anymore (more of a dull exhaust note). I do have a
dial gauge if these is an alternative method. Advice appreciated
I didn't take a recording of the previous measurements, all I know is that I increased the gap on all of them as the feeler guage was a tight
fit.
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Mark Allanson
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| posted on 7/7/07 at 06:13 PM |
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A dial gauge will be no good, have you measured it in the right place, should be under the cam against the rocker, not the rocker to valve gap
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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delboy
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| posted on 7/7/07 at 08:24 PM |
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valve clearances
Don't know how much help this will be, however, i've raced pinto engined cars with very high list cams in the past and always set both
inlet and exhaust clearances at 10 thou of an inch. With lots or regulation restrictions in our sport I was still getting 160bhp at the flywheel; from
a 2 litre pinto with a standard exhaust manifold and front pipe and a 32/26 dgv carb.
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Dingz
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| posted on 7/7/07 at 09:51 PM |
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Dont know about KC but Piper use std clearances .008 / .010 except for the 320° cam. Is the info not on their website?
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Peteff
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| posted on 7/7/07 at 11:05 PM |
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With the lobe pointing up you shove the feeler under it, how can you get it wrong? Locking the nut tends to close the gap up so allow a bit for it.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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se7ensport
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| posted on 8/7/07 at 01:28 AM |
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I'm confident I got them round the right way, I also set them while cold.
thinking about it futher there is the possiblity I read the mm rather than thou measurement of the feelers, which I'll check in the morning.
Thanks for the info guys, I'll see what I discover in the morning.
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snapper
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| posted on 8/7/07 at 06:02 AM |
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My initial thoughts were .mm used instead of thou can be common mistake with an engine in imperial and the rest of the car in metric, also check your
cam timing.
Probably when you set the gaps you changed the rocker arm to cam angle and advanced or retarded the cam a smidge.
I suggest that once the gaps have been reset all will return to normal but its worth getting a feel for the Pinto rocker set geometry.
With reprofied cams you use a bit more rocker post adjustment and move the rocker arm away from flat and level thus moving the point of contact around
the cam, lash caps on the valve stem redresses the problem.
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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se7ensport
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| posted on 8/7/07 at 10:04 AM |
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quote:
Originally posted by Mark Allanson
A dial gauge will be no good, have you measured it in the right place, should be under the cam against the rocker, not the rocker to valve gap
I have the valve timing of 42/78 74/43, I figured that I could use the dial guage to check that I was getting these figures once I've checked
the clearances.
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se7ensport
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| posted on 10/7/07 at 10:09 PM |
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Thanks all, back up and running better and quicker than before.
Not sure what the exact cause was because I found a couple of problems:
I'd cracked the ceramic on one of the plugs putting it back in.
a couple of the valves needed to be readjusted, really hard to set right as tightening up the locking nut seems to close the gap even if you hold the
adjuster still
added bonus in reading the kent cams website it turned out I had timed my cam wrong, it should have been 108 not 105 as per Burtons website!
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