Micael
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| posted on 24/11/07 at 06:03 PM |
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Wild Piper Cams?
Hi Guys!
I've been offered a set of used Piper "Rally"(BP300 mech) cams for my Zetec. Piper states that I need to use mechanical lifters (I
have a silver top).
Does anyone know whats involved to switch to mechanical lifters? I read somewhere that machining is needed on the head. If so, what machining are we
talking about
I have asked Piper, but i haven't got any anwser yet (two weeks)
Micael Moose Åman
Petrolhead and all around nice guy
"Don't leave the duck there. It's totally irresponsible. Put it on the swing, it'll have much more fun." //Sleep Talkin Man Dec 23
2009
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Fatgadget
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| posted on 24/11/07 at 06:37 PM |
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In most cases when using "wild" cam profiles,pockets have to be machined in the pistons and also the bores where the cam buckets run need
dressing. That is certainly the case on Lotus twin cams and BDAs.
Checking if the cam bores need dressing is dead easy.Assuming the head is off the block, bolt in the cams (without the camfollowers)Rotate them if
dressing is needed it will be obvious.
Checking for valve/piston clearance is a bit tricky not to mention time consuming. You will need some modeling plasticine and loads of patience!
Last but by no means least,finally check for coil binding. If that is out the wrong way, you will wreck your top end in seconds!.
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Mr Whippy
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| posted on 24/11/07 at 06:59 PM |
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you might find it is quite horrible to drive such an engine day to day as the valve timing will be set for very high rev’s with little low end torque.
Most cam manufacturers seem to recommend not going crazy and instead selecting a mild race cam at most for the road. There's also a chance that
the piston crowns may need machining to clear the valves now that they open further. Burton power should be able to help as they do know their
engines.
[Edited on 24/11/07 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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russbost
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| posted on 24/11/07 at 07:22 PM |
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I'd second what's already been said, once you get into pocketing pistons/the block you're really into a complete engine rebuild
& major expense, plus the resulting engine will probably be a pig to start & will run like a bag of sh*te at low revs particularly until fully
warm.
Just go BEC!
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headlights, indicators, mirrors etc, best prices in the UK! Take a look at http://www.furoreproducts.co.uk/ or find more parts on Ebay, user names
furoreltd & furoreproducts, discounts available for LCB users.
Don't forget Stainless Steel Braided brake hoses, made to your exact requirements in any of around 16 colours.
http://shop.ebay.co.uk/furoreproducts/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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Micael
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| posted on 24/11/07 at 08:07 PM |
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Thanks for your reply guys.
I haven't got the prirce on them yet so i decide what to do when i get it.
Micael Moose Åman
Petrolhead and all around nice guy
"Don't leave the duck there. It's totally irresponsible. Put it on the swing, it'll have much more fun." //Sleep Talkin Man Dec 23
2009
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david walker
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| posted on 24/11/07 at 08:27 PM |
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Right, the Piper 300 cams for a Zetec are not 300 degree cams, in fact they are 284 inlet and 280 exhaust. As such in a seven type car with correctly
set throttle bodies or say bike carbs they will run a treat. With the appropriate additional work they will make a strong 200bhp.
They are a "mechanical" profile cam - that means solid lifters are required. Your standard engine is fitted with hydraulic lifters. Piper
list mechanical lifters at £368 + delivery + vat per set.
In addition you'll need verniers, possibly springs and retainers. Machining work may need doing to the head and yes the pistons may need
pocketing. You will certainly need to do some serious porting to unleash the potential of the upgrade.
Piper (like Kent and others) will not / cannot advise what needs doing. Your engine builder has to sort that out for himself. Piper will not get back
to you.
This is an expensive route to go down - do not expect to buy a pair of cams like this off E-Bay or somewhere and transform your car for an afternoons
work.
The Zetec engine is harder (read more expensive) to extract power from than say an XE or Duratec. If you have the wherewithal to upgrade the Zetec,
don't, just invest in the bits for a Duratec.
Dave Walker, Race Engine Services - 07957 454659 or 01636 671277
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Micael
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| posted on 25/11/07 at 12:47 PM |
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Thanks Dave,
I better leave these cams and search for some milder ones.
Micael Moose Åman
Petrolhead and all around nice guy
"Don't leave the duck there. It's totally irresponsible. Put it on the swing, it'll have much more fun." //Sleep Talkin Man Dec 23
2009
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