Cams, Cams, Cams

[Barron]

Cat Cam 551's
Why do people go for the 422's over the 551's?
551's have too much lift? meaning piston/valve contact?

[FONT=&quot]partnr.[/FONT]
[FONT=&quot]duration[/FONT]
[FONT=&quot]duration[/FONT]
[FONT=&quot]maximum lift[/FONT]
[FONT=&quot]lift at TDC[/FONT]
[FONT=&quot]parts[/FONT]
[FONT=&quot]application[/FONT]
[FONT=&quot][data link][/FONT]
[FONT=&quot][0.1mm+cl][/FONT]
[FONT=&quot][1.0mm+cl][/FONT]
[FONT=&quot][cl=0][/FONT]
[FONT=&quot][cl=0][/FONT]
[FONT=&quot][-][/FONT]
[FONT=&quot](TURBO)[/FONT]

[FONT=&quot]5502428[/FONT]
[FONT=&quot]272 / 256°[/FONT]
[FONT=&quot]236 / 219°[/FONT]
[FONT=&quot]11.30 / 10.25mm[/FONT]
[FONT=&quot]0.55 / 1.55mm[/FONT]
[FONT=&quot]O.E.M.[/FONT]
[FONT=&quot]HYDR: [/FONT][FONT=&quot]sport[/FONT]
[FONT=&quot]5502421[/FONT]
[FONT=&quot]276 / 268°[/FONT]
[FONT=&quot]240 / 231°[/FONT]
[FONT=&quot]11.25 / 10.25mm[/FONT]
[FONT=&quot]0.65 / 2.25mm[/FONT]
[FONT=&quot]O.E.M.[/FONT]
[FONT=&quot]HYDR: [/FONT][FONT=&quot]sport[/FONT]
[FONT=&quot]5502420[/FONT]
[FONT=&quot]269 / 256°[/FONT]
[FONT=&quot]231 / 219°[/FONT]
[FONT=&quot]11.25 / 10.25mm[/FONT]
[FONT=&quot]0.40 / 1.55mm[/FONT]
[FONT=&quot]O.E.M.[/FONT]
[FONT=&quot]HYDR: [/FONT][FONT=&quot]F.I.A.[/FONT]

[FONT=&quot]5502422[/FONT]
[FONT=&quot]284 / 276°[/FONT]
[FONT=&quot]247 / 239°[/FONT]
[FONT=&quot]11.25 / 11.25mm[/FONT]
[FONT=&quot]3.40 / 2.85mm[/FONT]
[FONT=&quot]custom[/FONT]
[FONT=&quot]HYDR: [/FONT][FONT=&quot]rally & cross[/FONT]
[FONT=&quot]5502423[/FONT]
[FONT=&quot]292 / 284°[/FONT]
[FONT=&quot]255 / 247°[/FONT]
[FONT=&quot]11.25 / 11.25mm[/FONT]
[FONT=&quot]3.95 / 3.40mm[/FONT]
[FONT=&quot]custom[/FONT]
[FONT=&quot]HYDR: [/FONT][FONT=&quot]rally & race[/FONT]

[FONT=&quot]5502551[/FONT]
[FONT=&quot]288 / 288°[/FONT]
[FONT=&quot]251 / 251°[/FONT]
[FONT=&quot]11.45 / 11.45mm[/FONT]
[FONT=&quot]3.35 / 3.35mm[/FONT]
[FONT=&quot]custom[/FONT]
[FONT=&quot]MECH: [/FONT][FONT=&quot]rally & race[/FONT]
[FONT=&quot]5502552[/FONT]
[FONT=&quot]295 / 295°[/FONT]
[FONT=&quot]259 / 259°[/FONT]
[FONT=&quot]11.95 / 11.95mm[/FONT]
[FONT=&quot]3.85 / 3.85mm[/FONT]
[FONT=&quot]custom[/FONT]
[FONT=&quot]MECH: [/FONT][FONT=&quot]rally & race[/FONT]
[FONT=&quot]5502553[/FONT]
[FONT=&quot]304 / 304°[/FONT]
[FONT=&quot]267 / 267°[/FONT]
[FONT=&quot]12.45 / 12.45mm[/FONT]
[FONT=&quot]4.40 / 4.40mm[/FONT]
[FONT=&quot]custom[/FONT]
[FONT=&quot]MECH: [/FONT][FONT=&quot]rally & race[/FONT]

 

[sideways danny]

because you need solid lifters to go with them.

Also look like they'd be for a very high revving high compression setup

 

[Barron]

because you need solid lifters to go with them.

as in for the required rpm or just the fact you need them?

 

[Fred@BTM]

288/280 schircks! do it!

 

[sideways danny]

it says MECH in the spec. Notice how all the lower spec ones say HYDR

that's mechanical and hydraulic tappets/lash adjusters

 

[sideways danny]

288/280 schircks! do it!

a highly technical and well reasoned arguement. Well done

 

[Barron]

it says MECH in the spec. Notice how all the lower spec ones say HYDR

that's mechanical and hydraulic tappets/lash adjusters

ok cool, thanks danny.

got any more specs fred?

how do they compare to 422's?

 

[Fred@BTM]

high comp engine they made 205bhp@wheels

 

[sideways danny]

think we saw 212 at the wheels with 422s

 

[Kam.]

Is it for a track car? The 551's will be a fair bit more aggressive but you'll struggle with idling problems which for an everyday car would become annoying.

We've got a club discount on the 422's at the moment btw.. if you decide to go for the 551's with the required PAC-E99862 springs send me a pm and I'll work out a good price for you.

 

[sideways danny]

can't do the 551s without solid lifters though, which IIRC are around £800 a set IF you can get them

 

[Fred@BTM]

a highly technical and well reasoned arguement. Well done

what flew up your arse and died?

 

[trile]

and it's argument, not arguement

 

[Hutchie]

because you need solid lifters to go with them.

Also look like they'd be for a very high revving high compression setup

if you got high compression and not revving it above 8k then..

its fine right

 

[sideways danny]

Well, I've not used these ones due to their limited suitability (be pointless fitting them if you're not going to rev the engine, the peak power would be above the limiter) BUT, every set of cams I have fitted that are spec'd as for solids have a different profile to those which are for hydraulics (comparing same/similar lift and duration)

 

[Andyman]

high comp engine they made 205bhp@wheels

Good power that but are they driveable at low rpm? Too high a duration for a road car would you say ?

 

[Bazzon]

Good power that but are they driveable at low rpm? Too high a duration for a road car would you say ?

Our car isnt a road car so doesnt really matter.

 

[Domobaby]

Sorry to go off on a bit of a tangent...but I hate revving at the top end at any point it feels like im killing the car.

Are there cams out there which focus on the lower rev ranges where torque could be increased?

 

[Riley!]

yes, standard lol

 

[Domobaby]

So aftermarket cams only assist in increasing power at the top end of the rev range is what your saying?

 

[sideways danny]

Good power that but are they driveable at low rpm? Too high a duration for a road car would you say ?

I think in both cases they're with ITBs (certainly the car i was citing), which makes the low end drivability far far better anyway if done right

 

[franx]

Sorry to go off on a bit of a tangent...but I hate revving at the top end at any point it feels like im killing the car.

Are there cams out there which focus on the lower rev ranges where torque could be increased?

Yes there are mate. For example the "Group N" cams. they are less topend but more midrange. (used for Group N Rally racing). I believe Renault Sport (Dieppe) sell only an intake cam for this Rally classification, the exhaust cam is left alone.

 

[Dan R]

Sorry to go off on a bit of a tangent...but I hate revving at the top end at any point it feels like im killing the car.

Are there cams out there which focus on the lower rev ranges where torque could be increased?

Dont ever buy a renaultsport clio then lol. Revving it is where the fun is!!

 

[franx]

Good power that but are they driveable at low rpm? Too high a duration for a road car would you say ?

My cams have about the same specs as Schrick , and they give both torque aswell as high rpm power. I gained both ways, love these cams

http://www.colombo-bariani.com/popup_dettaglio.php?lang=eng&id_prodotto=103

 

[Andyman]

Sorry to go off on a bit of a tangent...but I hate revving at the top end at any point it feels like im killing the car.

Are there cams out there which focus on the lower rev ranges where torque could be increased?

Im running Pipers re-grinds with other mods and it pulls very well indeed from really low down without having to rev the tits off it thats why i was asking about Freds 240bhp motor and what it was like lol - Peak powers not too hot on paper compared to most but the torques very good

IMO tho theres better and easy ways of getting power than the cam route. All depends what you want tho

 

[Fred@BTM]

we had a 7500rev limit, and it was pulling like a train from 3500, went bonkers at 5k
http://www.youtube.com/watch?v=7rbAKV2tv98

 

[franx]

^^ yes the 5K(ick) is unbelievable

 

[Fred@BTM]

i recall we had the same torque that a stock 172 makes peak, but at 3000rpm

 

[matty172cup]

would cat cams 422's run fine on standard inlet as long as its been mapped??? and are they better than the 428's???

 

[sideways danny]

would cat cams 422's run fine on standard inlet as long as its been mapped??? and are they better than the 428's???

yes, seen good results on the standard inlet (albeit reworked). You cant use them with standard pistons though, you need enlarged cut-outs in the piston crown due to the extra lift at TDC, and they are more suitable to higher compression anyway really.

Better is difficult to quantify, 428s and 421s are more suited to stock internals, 428s are as wild as you can run on stock management, 422s will push peak power up the revs, but with the right other parts and setup will give more power overall. It's far from being as straightforward as "better"

 

[matty172cup]

cheers danny

 

[rob_clio197rs]

no there are some cams which assist low down torgue and bhp

 

[Toxic#66]

CatCams 421 / 182 exhaust manifold / few other mods

Can't complain for low down torque and power I eat Cupra 183BHP for breakfast But I was certainly counting for a better top end power output (looks like another calibration is needed)

 

[sideways danny]

that graph is NASTY!!!!!

 

[172Ben]

Are the lines ment to look like a heart rate monitor?

 

[sideways danny]

no they're definitely not

 

[franx]

Nasty as in ... ?

may be the 30C temp ?

 

[Hutchie]

Nasty as in ... ?

may be the 30C temp ?

power delivery should be smoother!!!

not like a choppy sea in the middle of winter

 

[Toxic#66]

I forgot to say it was made at 5 gear (maby thats why its nasty, slower more accurate) in 4th it spin up to fast and RR was interrupter at about 4k kick

 

[sideways danny]

looks like it's bouncing off the knock protection TBH