Camshaft identification

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Flyingtiger
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Camshaft identification

Postby Flyingtiger » Sat Feb 16, 2019 10:54 am

Looking at some other forums this seems to be a bit of a minefield! why can't camshaft manufacturers make it clear what they are?

Currently mid head gasket replacement, so whilst I'm there ... you know how it is!

Thinking of replacing the cams for something with a bit more but I'm not sure if these are already 'faster' cams anyway.

Stamped on the castings it has 'KC' and 'SPORTCAM'. Kent Cams I'm starting to think... BUT on the cam ends (piccys below) it has 'BP285HY' plus IN/EX (I've worked that bit out :D ), also another group '703' and a '2'.

BP285H comes up as a reference for Piper's ultimate road cam! :?

Can anybody please share their wisdom on camshaft recognition please? I really don't want to waste the wedge on something potentially not needed - rather spend it on ECU replacement as no-one seems to like Weber Alpha any more. :(

Thanks all.
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Matth93
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Re: Camshaft identification

Postby Matth93 » Sat Feb 16, 2019 9:12 pm

It looks to me like they are piper 285 cams

Thrustyjust
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Re: Camshaft identification

Postby Thrustyjust » Tue Mar 12, 2019 9:50 pm

Lots of cams are reprofiled original cams . So by doing this, there isnt too many places to be able to stamp their model on them. Usually as you can see , its a little bit of investigating to confirm. Agree this is the 285 profile from Piper cams . Sadly , its not just a case of chucking in new cams and you get more power. Cams are designed to be part of modification to an engine and work in conjunction with other mods. This is the case moreso for more aggressive cams. These can require pistons to be machined, head porting , induction changes and even manifold and exhaust changes, from bore sizes to pipework primary lengths and how they are connected , such as 4 into 1 or 4 to 2 to 1 .
Misconception by people is to fit the lumpiest cam they can and it will reap power. Cams should be relative to what you want. High profile and large overlapping cams can create an engine which is 'cammy' , so will idle crap and pull away shunting and slow until the port velocity speeds up enough to 'come onto cam' and then they create power. So, there is a lot of dimensions than just buying some cams and putting them in. Turbocharging doesnt want high overlapping cams, which is why a lot of turbo modded cars use standard cams. If you have a car which uses a cat and has emission checks for MOT then big cams can be an bum for getting a car through.
Just some fuel for thought and probably gone too far as I usually do. But theyre are masses of books just on cam design, applications and other things like A Series scatter cams , which is another story. :D

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leegav
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Re: Camshaft identification

Postby leegav » Thu Mar 14, 2019 9:50 pm

P285 = piper 285 ...
There is no such thing as a lumpy cam.....unless you drive like a vagina :lol:
Drop the box 4 gears you’ll see :lol:
Thanks for the lesson in cam mega basics ffs :lol:
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steve m
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Re: Camshaft identification

Postby steve m » Fri Mar 15, 2019 5:17 pm

I run a 285 or 270 cam in my xflow, and it does exactly what I want, the 285 has more of a power band than the 270, but I do run a 4 speed box, so am able to keep the revs with in the 3-7k band quite well
Thats was probably spelt wrong, or had some grammer, that the "grammer police have to have a moan at

Thrustyjust
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Re: Camshaft identification

Postby Thrustyjust » Sat Mar 16, 2019 1:26 pm

leegav wrote:P285 = piper 285 ...
There is no such thing as a lumpy cam.....unless you drive like a vagina :lol:
Drop the box 4 gears you’ll see :lol:
Thanks for the lesson in cam mega basics ffs :lol:

The only vagina I can see is the respondee.I did this to help others with cam identification and help others for the future. :?

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Flyingtiger
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Re: Camshaft identification

Postby Flyingtiger » Mon Mar 18, 2019 12:32 pm

Thrustyjust wrote:Lots of cams are reprofiled original cams . So by doing this, there isnt too many places to be able to stamp their model on them. Usually as you can see , its a little bit of investigating to confirm. Agree this is the 285 profile from Piper cams . Sadly , its not just a case of chucking in new cams and you get more power. Cams are designed to be part of modification to an engine and work in conjunction with other mods. This is the case moreso for more aggressive cams. These can require pistons to be machined, head porting , induction changes and even manifold and exhaust changes, from bore sizes to pipework primary lengths and how they are connected , such as 4 into 1 or 4 to 2 to 1 .
Misconception by people is to fit the lumpiest cam they can and it will reap power. Cams should be relative to what you want. High profile and large overlapping cams can create an engine which is 'cammy' , so will idle crap and pull away shunting and slow until the port velocity speeds up enough to 'come onto cam' and then they create power. So, there is a lot of dimensions than just buying some cams and putting them in. Turbocharging doesnt want high overlapping cams, which is why a lot of turbo modded cars use standard cams. If you have a car which uses a cat and has emission checks for MOT then big cams can be an bum for getting a car through.
Just some fuel for thought and probably gone too far as I usually do. But theyre are masses of books just on cam design, applications and other things like A Series scatter cams , which is another story. :D


Thanks for the info - well i found it interesting!! I know there is a lot of science behind engine tuning, simply bolting on new bits doesn't always reap the rewards.
TBH the car was running well before imho but the head gasket had gone, so strip down was needed. A couple of valve seals leaking a bit too revealed some guide wear. Took it to Classic and Modern Engine Services in Bracknell. Don't know if anyone else has feedback but seemed very knowledgeable, recommending what work could/needed doing without ripping me off (I hope!), new valve guides, re-seat the valves and head skim, looks good, will add photos later. Head not back in the car yet but so far i'd recommend them. He confirmed Piper 285 cams, the 'H' is for hydraulic lifters apparently! Also found the head has been ported and polished too, a bonus.
So Weber Alpha TBs, Piper285s, ported/polished head with triple cut valve seats, 4-1 stainless exhaust, spec is the same, just nice and shiny now - must be worth an additional 10 horses right? :lol:
Just ordered vernier pulleys too to help with dialling in - and they look nicer!
Would like to get it checked/mapped on the ECU side but no one seems to touch weber alpha ECUs any more. oh well start saving again ... :roll:
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