View Full Version : cams
dannyb1986
24-04-2006, 18:52
which are good fast road cams to use? ive heard some bad reports about some on here, just wondered how cheap exspensive they are, and are they really worth it?
Clio_GTT
24-04-2006, 18:59
AWT custom cams are quite good, otherwise just the usual piper, catcams, kent
Ben's AWT cams are Catcams camshafts...
if you want Catcams i can offer you a discount on retail prices.
they typically arent as cheap as other, lesser quality, camshafts.
dannyb1986
24-04-2006, 20:02
how much are they and what sort of gains would i buy looking for from them? do they come with adjustable pullies?
your looking at roughly £400 for cams then another £200 for vernier pulleys. tbh on a valver cams arent worth the cash according to many experts such as benr, although on a williams they are meant to offer very good gains. which is why im getting new cams and pulleys fitted on mine next month. 8)
Ben's AWT cams are Catcams camshafts...
if you want Catcams i can offer you a discount on retail prices.
they typically arent as cheap as other, lesser quality, camshafts. they are made by catcams but to benr spec, so not the same as the off the shelf catcams.
ur best off going meggie bottom end first mate and a remap/gunnerchip
thats what am saving for! :twisted:
or u could just buy a williams. :wink:
nah, be too scared to touch it, gotta keep em original or u get lynched!lol
plus i aint got 5 grand knockin about! :wink:
Ben's AWT cams are Catcams camshafts...
if you want Catcams i can offer you a discount on retail prices.
they typically arent as cheap as other, lesser quality, camshafts. they are made by catcams but to benr spec, so not the same as the off the shelf catcams.
it will only be the duration that is specified mate.
^^^ he was saying that they are lobe, ramp, lift and durations that HE thinks give best performance on the f7r engines.
duration isnt everything when it comes to camshafts!!! :twisted:
Ben's AWT cams are Catcams camshafts...
if you want Catcams i can offer you a discount on retail prices.
they typically arent as cheap as other, lesser quality, camshafts. they are made by catcams but to benr spec, so not the same as the off the shelf catcams.
ok...they are still Catcams camshafts though....the same as
MY custom spec Catcams cams are....
and the whole profile of the lobe can be specified, not just the duration
stan. do u have your own business? do u have a website i could have a look at?
i do have my own business...Advanced Powertrain Developments. as per the title i specialise in engine development i.e. making them more powerful! allso road/race builds, cyl. head flow development, custom installs etc etc.
my website: ap-developments.com is still under construction, as i have only recently officialy started trading. once the site is finnished i will start to advertise properly!
Ben's AWT cams are Catcams camshafts...
if you want Catcams i can offer you a discount on retail prices.
they typically arent as cheap as other, lesser quality, camshafts. they are made by catcams but to benr spec, so not the same as the off the shelf catcams.
it will only be the duration that is specified mate.
duration is one of the least important factors in cam design.
fare enough stand correct.
stan . can you design cams for turbo use. 8.5 compression 1.8 litre 2 to 2.5 bar boost prob 3000rpm to 8000rpm as running arrow rods and forged pistons. had a set designed by piper but they only run 9.6 mm lift. think they should run at least 10.5mm or 11mm lift with short duration. any thoughts welcome. think piper owe me a refund though. cheers neil
The problem is that with short duration cams, massive lift equals high valve velocities through the acceleration and decelleration curve whihc means with the small amount of peak lift time your left with a high chance of float. I say this because their advertised durations are quite true to their geometrical ones.
I'd run something with a geometrical duration of circa 263 and 260 but a 40 thou lift duration of 230 & 225 deg, int and exh respectively. You could probably get it to run about 10.5mm lift with some higher seat pressure and interference fit springs to get rid of some of the harmonics you will encounter. If you can, run larger valves to make use of the available area. Lift @ tdc value of about 1.05mm and 0.65 respectively again.
Something like this will hold a good spool point and midrange, but will probably start tailing off before 8000rpm. it'll be a trade off either way, but from what i like with turbos is that high power is easy, concentrate on spoolup speed and as much torque as possible low down, and it makes for a killer drive. I love my everyday car because it boosts at 1200rpm, this means 5th gear all day and fantastic overtaking capabilities.
If you want something peakier, thats also an option.
2.5bar.....thats a shit load!
as ben says, i would look at increasing valve area. 260 0.1mm duration sounds about right i guess ....i would be tempted to keep lift less than 10.5mm due to the issues ben has pointed out with increasing stresses, and let increased inlet area do the work.
it would maybe be worth trying a lower exhaust duration if u have time/money, along with overall timing. from this u would find a sweet spot to get usable boost sooner to make it more drivable off boost.
dannyb1986
27-04-2006, 08:08
are kent or piper cams any good?
ill let u know mate. ive got a new set of kent cams ready to go in mine with new piper verniers as the kent ones are shit. hill power use the pipers so they must be decent as well.
well...hillpower use piper becuase they have had a deal with them for years, doesnt necessarily make them decent!
the quality of materials used by piper/kent, and the finnishing processes applied arent to the level of Catcams camshafts.
not to any stretch of the imagination.
you should go there and see how they are made.
cheers again ben and stan. think the piper are closer than i thought then. stroke of luck that. as for valve area already fitting larger inlets and having the head ported and sorted for the turbo app. cheers again maxiboy
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