DX engine piper cam woes

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blackwedge
Posts: 15
Joined: Wed Jan 29, 2014 7:51 pm
fill in the right answer: 15
Location: Jersey Channel Islands

DX engine piper cam woes

Post by blackwedge » Wed Nov 29, 2017 6:06 pm

Evening all, A bit of a long story so i'll be brief:

Fitted piper fast road cam and piper followers, made very sure to zip tie the cam belt to the pulley BEFORE removing old cam to maintain timing alignment, replaced cam, checked dizzy arm was still lined up to the line, it was. Put everything back together, ran it for 20 minutes at 2000 revs to wear in correctly as per instructions.

Car drove fine for a week, although with no noticeable increase in performance over the stock cam (I decided not to scream it until it had done a 100 odd miles or so, thought it might need to settle in)

Then one day went to start her and she back fired and ran with 2 then 3 cylinders and finally all 4, left her for ten and she started and seemed to run ok but with no real guts. Checked the timing and set her to +6 degrees using the white notch on the crank shaft wheel lined up the the mark on the crank case ( vacuum hose off and blocked)

Anyhoo, now she will not start and when she does its lumpy and poppy as F and the merest tap of the accelerator and she dies. I'm sure i've screwed up somewhere, any ideas.

Any suggestions would be appreciated.

p.s, replaced dizzy cap,rotor arm, ht leads, coil, ignition amplifier, fuse box and fuel pump relay.



chopperoli
Posts: 204
Joined: Thu Apr 02, 2009 12:42 pm

Re: DX engine piper cam woes

Post by chopperoli » Wed Nov 29, 2017 6:33 pm

cam timing skipped or HT leads in wrong order?



blackwedge
Posts: 15
Joined: Wed Jan 29, 2014 7:51 pm
fill in the right answer: 15
Location: Jersey Channel Islands

Re: DX engine piper cam woes

Post by blackwedge » Wed Nov 29, 2017 6:38 pm

Hi Chopperoli

checked the ht leads order, all good, I think maybe somehow the timing has skipped on the cam belt. maybe I need to fit a dedicated piper cam vernier pulley as the stock one will always be out, just thought that now, maybe stock pulley will not work.

thanks for the suggestion, its got me thinking.



BlackGTX
Posts: 494
Joined: Wed Mar 16, 2016 8:53 pm
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Re: DX engine piper cam woes

Post by BlackGTX » Wed Nov 29, 2017 7:00 pm

Have you tried tdc-1 so 1 tooth behind tdc, turn it with a socket before cranking to be sure it doesnt foul