4.6 camshaft

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boycie

boycie

Active Member
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538
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Silver end Braintree ESSEX
Hi Folks I intend to rebuild my 1999 thor engined 4.6 later in the year and I am buying bits and pieces here and there in preparation I have seen a new Piper 180 no nose cam at a fair price would this cam be a good choice to fit in my engine, I don't really want to have to involved with modifying the head or rockers ?.
 
Only used Piper 270, 285 and real steel cams so can't speak from experience. Plenty have said good things on here so try a search. Though someone will come along eventually. From the specs it has a shorter duration than oe and under 0.5" lift so it's a straight forward installation and probably good torque peaking a bit lower down.
 
cooltide said:
From the specs it has a shorter duration than oe and under 0.5" lift so it's a straight forward installation and probably good torque peaking a bit lower down.
Click to expand...

Not intending to highjack the thread but when you talk about shorter duration / peak torque lower down, my 3.5 efi cam has a duration of 256 degrees against the carb. version's of 280. The efi produces peak torque (207 lbs.) at 3200 against the carb's (194) at 2500. In the light of your obvious knowledge I wonder if you can enlighten me a little :confused:
 
norseman said:
Not intending to highjack the thread but when you talk about shorter duration / peak torque lower down, my 3.5 efi cam has a duration of 256 degrees against the carb. version's of 280. The efi produces peak torque (207 lbs.) at 3200 against the carb's (194) at 2500. In the light of your obvious knowledge I wonder if you can enlighten me a little :confused:
Click to expand...
Possibly 2 different ways of measuring. Real steel cam's for instance show shorter durations than you'd expect which is down to the duration of the cam over x" lobe lift, whereas others measure duration the valve is off it's seat. Rover v8 efi oe cams are 280 or 285 valve duration, more fuel charge at higher rpm, bhp and peak torque move up the rpm range.
 
Just been reading the specs again.
Turners advertise the h180 as a straight swap and Kent themselves advise single valve springs though the valve lift is 10 thou over the recommended limit of STD springs. Doesn't necessarily mean that carries through exactly when installed, and it is going to be operating at lower rpms.
Would be nice to hear from someone with first hand experience
 
Grrr is right, i had the KENT 180 on mine (from Turners). No mods needed they advised & this was a no mods fit when building the engine. I found the low end torque & performance far better but could possibly also be due to the high comp mod (4.0l pistons). It does run out of puff at the top end & at around 3800rpm feels the same as my old engine (it rarely gets that much paste now as i live in fear of my HG's blowing). It does give an effortless steady drive with plenty of torque as said though.
 
Grrrrrr said:
@martynv8 might have tried a few. Mozz used to chew through cam-shafts like a dope-crazed gerbil going through seeds.
Click to expand...

My guess was a swarf blockage in a tappet feed. With it being the same lobe every time that is all it could be. Happened with monotonous regularity after engine was top hatted. I am amazed the people who changed several cams for him never thought of that.
 
cooltide said:
Rover v8 efi oe cams are 280 or 285 valve duration, more fuel charge at higher rpm, bhp and peak torque move up the rpm range.
Click to expand...

Thank you for that although the genuine LR workshop manual does show the duration (9.35cr 3.5efi models) as 256 degrees. 'Running out of puff at 3800' (Martyn) doesn't bother me as I seldom reach that :rolleyes:
 
Thought we were heading for a Jethro joke there:

"That car you sold me won't go past 70 on that there hill."
"What's wrong wi' that then?"
"I lives at number 95!"
 
God I'd completely mis-remembered Jethro,
The one about his wife encountering him in the kitchen dabbing his member in a saucer of milk after burning it somehow, she said she'd often wondered how he re-loaded it, not outright funny but with Jethro it seemed hilarious.;)
 
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