karl_t60_1

Any one have any know the cam specs of a stadard my00 and the stiV5, lift, duration, etc. Or has any one had custom cams ground? results? Any help is apreciated.

john banks

Would also like to know.

Pavlo

My sti5 cams are nothing special, same as Uk possibly, certainly possible judging by the lift.

There are a few people trying at least 3 different cam profiles in the near future. I am one of them.

Paul

john banks

Another STi myth out the water? Some others have suggested the same. Some STis with big turbos are making peak power by mid 6000s. Anyone on STi cams topping out at 8250 RPM?

Pavlo

Yes, the older cars deffo had a range of cams. The newer Ph 2 ones seem all very similar if not identical. That said, they do have more lift than the standard MY94 wrx ones.

I was looking at the threads last night.

Paul

MorayMackenzie

I am sure i had replied to this one already...

Anyways...

The STI 3 Cams are definitely different to some of the other cams of similar vintage. Lots more duration and lift. Smaller base circle, so they look less aggressive initially.

Bob Rawle

Can categorically confirm that there are major differences.

S,M,G

There are veriants for sure ive seen .304 lift, .327, .345 and a late cam that had .365-.355 v/lift and almost 280 degrees on the exhaust i dont no what it was out of but it was a std casting with std base circle and i fitted it and duration was as stated. Most stock cams have about 16 degrees overlap this will give good low down torque but you can run as much as 40 degrees overlap and still retain the torque, there main reason for such little overlap is emission control. Just out of interest the wrc cars run .365 lift but this is for a reason. I have some mild back ground on the mentioned cams {.365) all lagit i might add... it is on the cards that these are from a uk car but not for sure.
Steve

Andy.F

My cams are only 0.307" lift Overlap I'm not sure of but they 'look' almost closed at TDC.

Steve, if you're not fussed about idle quality is there any advantage at high RPM from advancing the intake cam on an early WRX ?
What's the most lift I can run on early solid lifter (under tappet shim) heads ?

cheers

Andy

David_Wallis

cue andy moving a cam pulley or two a tooth..

dowser

It doesn't cost much

Richard

Pavlo

edited to say something about the correct thread...

Paul

[Edited by Pavlo - 3/13/2003 9:18:20 AM]

Andy.F

Edited to make Pauls reply below look silly

[Edited by Andy.F - 3/13/2003 10:09:42 AM]

Pavlo

yes wrong thread.

n00b!

S,M,G

Andy, as you say these are very mild cams you should find a little gain up top, i would try 105 on the inlet and 110 on the ex, this will help the mid as well, if all is well then max is about 104 in 108 ex. Sounds like you have sti valves in which case the door is opened to almost what ever you want. What is the lenght of the stem above the cotter groove, if thay are sti you can run some top hat shims and base circle size is not an issue. Springs will be the limiting factor, if sti then you can run .355 v/lift and .365 cam lift, DH22 is a good profile for this application and has .355 v/lift. If you want more then sring and retainers with double valve springs will be needed.
Steve.

Andy.F

Thanks for that Steve

I never measured the stem length above the cotter when it was apart but it is already fitted with 'top hat' style shims.

I checked the spring length and had 0.130" until coil bind at full lift, so take off the 0.050 extra lift and I would still have 0.080". Is this enough ?

I presume there is no problem running off the std (smaller) follower at this lift ?

What is the duration of the cams you mention ? and price ? email me if you prefer

cheers

Andy

Pavlo

Andy,

I thought your shims were flat. Steve is referring to ones that are located around the valve stem rather than just in the retainer.

Paul

Andy.F

Yes, Like a top hat Nobody believed this was a standard fitment but it is on my car !

Andy.F

Ere ya go !

Solid lifter and top hat shim pics -




Valve caps, one shim in place. Brass/Bronze? follower sleeves -

Pavlo

cool, I just had those pictures in my mind and thought they were flat shims.

S,M,G

Andy
With what you have spring wise there is a better profile as if im correct you want more up top, min spring clearance is .040 between coils, this other profile is a bit on the hot side but will be good for track and drag, and it will not be to lumpy on the idle.
.390 v/lift leaving you about .045 before coil bind, which will be spot on, so if you were to over rev it you will only have .045 before its bound leaving a nice safty factor and less chance of droping a valve. I would asume you will have about 180lbs of spring presure @ full lift, this is the min realy so it might be an idear to ceramic coat the springs as if thay get to hot thay can loose some presure and then things can go a bit pear shaped. Over lap will be 56 degrees and duration 276 this is with lobe centre angle of 110 degrees this can be played with to suit what you want a little expect a good power dilivery to 7500rpm @ 110.
Steve.
I will mail you at some point over the weekend.
Min bucket size 31mm.

[Edited by S,M,G - 3/14/2003 6:52:07 PM]

David_Wallis

Im guessing AndyF has different cams to me.

There was a thread posted by smg with cam durations etc.. stevieturbo knew some..

David

eyditd becos i karnt spel

[Edited by David_Wallis - 3/10/2003 11:24:41 AM]