Cams and Spring Question

[nitroazz]

I just picked up this head from a guy that has no clue.

It has a HKS 272 Exhaust cam but I am not sure on the Intake Cam or what springs and retainers it has. Any help would be appreciated.

Exhaust Cam is stamped HKS and also has the RM006 on it.
Intake Cam does not.
It has an B at the gear and an A opposite end.

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[TurboAnything]

You have one HKS cam and one stock cam.

 

[nitroazz]

That's what I thought, I have a further question on that though.

I haven't seen a cam with lobes this rough on the edges and the (hard to explain) area where you can put a wrench on it to turn by hand is thick, where as the three sets of stock cams I have, the one closest to the gear is bigger and the middle one is flat followed by the raised wrench area.

Any ideas on the springs?

 

[BogusSVO]

I can not see enough of the spring and retainers to tell.

Most aftermarket spring retainers have a name or part number on the retainer.

Pull a cam out and look

 

[nitroazz]

Perfect. I'll do that tonight when I am at home.

Pulled this number off the cam where the CAS would be: 201222212

No markings on the springs at all. Ideas?

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[BogusSVO]

The yellow stripe makes me think it is a manley spring.

http://www.dsmtuners.com/forums/cyl...2-evo-viii-stock-dsm-manley-brian-crower.html

 

[My1GLaser]

It looks like my Manley springs. I don't think my retainers have any markings. I just looked thru a couple pics of my head fully assembled and didn't see any.

 

[nitroazz]

Perfect. I figured they were a Manley Spring but wanted a second opinion. Not a bad deal, just gotta get a new intake cam and I am good to go.

So I just mic'd my cam lobes on the stock intake cam with HKS 272 written on it in paint marker vs. the actual hks 272 exhaust cam.

I have a reading of just shy of .4 on my 1-2" Mic. on all the lobes on each cam.
Compared to a stock 2g cam I have from another head, the "HKS" are much larger in the lobe.

Is it possible that the intake is a 272 grind?
Thanks for any help.

 

[nitroazz]

Bump for more responses. I just assume though that everyone is out at the track or enjoying our summer weather.

Thanks for any help.

 

[bradselph]

If its a regrind check under the HLAs for a little washer.

 

[nitroazz]

There seems to be a fair amount of oil in the hla port but no washer, unless it is non magnetic.

 

[bradselph]

Well i know regrinds from FFWD or delta have marks on the gear side like 264, 272, or 280 check there.

 

[nitroazz]

Nothing there. I have the seller trying to figure out where he got them from to talk to his seller about them but if I can figure out that out before then, the faster I can have them installed.

 

[BogusSVO]

Measure the base cirle of the cam and the the cam lift

 

[nitroazz]

Sorry, I went through my engine blueprinting books and none of them use any of those terms.

I assume and please correct me if I am wrong, as well as for anyone else requiring this info, that base circle should be taken where the cam shaft rides between the head and the cam cap.

Cam Lift, would that be the measurement "longways" on the lobe, from the highest point to the back of the cam?

I went through my service manual and I saw the specs there. Quickly compared to a known stock cam, the "272" seemed to be much thinner in the cap journal ( not sure if right terminology).

 

[BogusSVO]

Ok let me walk you thu.

On any 1 given lobe, measure appox 90* to the peak of the lobe, this will be the base circle.

Next measure from the peak (or toe) of the lobe to the heel of the lobe.

You have a "B" cam..

so it should look about like this...

Base circle 1.178
Toe 1.372
Cam lift .194
Net lift .3298

follower ratio 1.7 ( I have seen the ratio been listed as 1.73 also)

1.372 - 1.178 = .194 X 1.7 = .3298

Now if you measure the base circle and it is 1.128 that means the cam has been reground by .050

 

[nitroazz]

Base Circle: 1.179"
Lobe Lift: 1.388"
Cam Lift: .209"
Net Lift: .355"

1.388 - 1.179 = .209 x 1.7 = .355

Correct? But what exactly does that mean in terms of my cam?

My HKS stamped 272 Exhaust Cam is:

base circle: 1.179
Lobe: 1.427
Lift: .248
Net: .4216

So what does that mean? In the meantime, I'll measure my known stock 1g and 2g cams that I have.

 

[BogusSVO]

Well it means that it is a stock cam. and not a regrind.

It also tells me that as far as the "B" cams go there is a diffrence between the intake and exhaust cams.

Mine is an exhaust cam, no slot for a CAS.

That forumla lets you know what lift the cam is, and that is needed info when setting up springs.