Cam specs(more duration = more power??)

[locote]

i purchase some crower cams for my b18b ages ago but never bothered to look at the cam card until today.

and i noticed that the duration in the card is totaly different to what the web site tells ya.

Duration is 295 intake .422 lift
295 exhaust .411 lift


the web site says 264 in
264 out..


these are much larger than the 404s.
or factory b18c ones.
How will my motor respond to these cams untuned????

[ekslut]

should e-mail crower and find out what the real specs are first.

[locote]

i have they said what is on the card is the right info not on the web site.

[Dylanamus]

Untuned doesn't sound like a great idea. I have stage B cams and a whole new valvetrain to put in, but I won't until I can afford a new ECU+Dyno tune.

[ekslut]

yeah, should get a ecu and tune it. Did you change your valvetrain as well when you changed cams?

[ProECU]

lift & duration values are quoted along with a degree.

If you dont know what that means.... read up some more

[Cold Fusion]

i read an article on howstuff works about cams and it was kinda vauge, if the cams are bigger, does that mean the valves are open for longer? or does it mean tehre more accurate?

what a cam does-
http://static.howstuffworks.com/gif/engine-cam.gif

and for the whole article -> http://auto.howstuffworks.com/camshaft.htm

also good animation of the difference between the normal and performance cam on page 3 "revving the rpm"

[Slow96GSR]

Whats the part number on the cam?

[spoondc2]

Does all the Crower cam needs aftermarket ecu?

[locote]

They are 62403-2
i bought the valve springs and retainers and cam gears too.
the specs on the web site are same apart from duration which says 264 but my card says 295.

Ive emailed them again but yet to have a responce.

403s should work untuned but i imagine they are goin by the specs their web site says not what my cam card says.

[Slow96GSR]

Does all the Crower cam needs aftermarket ecu?
Nope!





They are 62403-2
i bought the valve springs and retainers and cam gears too.
the specs on the web site are same apart from duration which says 264 but my card says 295.

Ive emailed them again but yet to have a responce.

403s should work untuned but i imagine they are goin by the specs their web site says not what my cam card says.

Here (http://www.crower.com/misc/cam_spec/cam_finder.php?part_num=62403) use this one. The web site is updated more and is more accurate.

[locote]

i asked them about that one..
The responce i got is " your card is the right specs for your cam"

my card is different to that one

[Slow96GSR]

I always trust the web site. If you call and talk to Brian he should be able to tell you what you need. Really any tech there can but I always get Brian. I would go by the web site but that's me.

[locote]

well im waiting on his email.
i dont realy wanna call but i might have to.

[Cold Fusion]

if u brought retainers and springs for the 264, will they work in the 295?

[Slow96GSR]

Did you get set 84162 (http://www.crower.com/cgi-bin/detail.cgi?prod_id=84162) recomended for that cam off the site? If so then you are good. If not let me know and I'll call, that way you don't have a big phone bill! I looked and it seems like the longer the duration the less the lift is. Duration makes a difference in what spring you use but not as much as the lift.

[locote]

Hey thanks alot Slow96 GSR.
yes i got the recomended valve spring retainer set.
heres a copy of the cam card i got...
could you make an enquiry if its not too much trouble??


http://img97.imageshack.us/img97/2417/img0124nz.jpg

[Slow96GSR]

I shot Brian a email and he's out to lunch so he should have it and respond here in a few hours.

[Slow96GSR]

From: Dustin Spencer <dustin@crower.com>

The cam card is correct.

What I asked:

Subject: Cam cards. vs. web site?!

I have a friend that bought Cam 62403-2 and his card says duration 295, lift .422/.411 and the web site says the duration is 238/237, lift .425/.413. Which one should he go by? Thanks guys!

[Cold Fusion]

nice.

[locote]

Thanks GSR:)

[Slow96GSR]

No prob, any time.

[Non Vtec]

either way you will still have to dial them in and check clearances, Crowers cam cards suck arse, my K-series cams are alot bigger than the website or spec card says.. you'l' just need to check the max advance and retard the cams can have on adjustable gears, so you dont adjust them to much..

I also heard a rumour that brian is going to be leaving crower to start his own company, so you may not get a reply from him..

[Slow96GSR]

Already did.

[todaek9]

295 huh...hmm..tricky cams to gain power...

[Tony]

either way you will still have to dial them in and check clearances, Crowers cam cards suck arse, my K-series cams are alot bigger than the website or spec card says.. you'l' just need to check the max advance and retard the cams can have on adjustable gears, so you dont adjust them to much..

I also heard a rumour that brian is going to be leaving crower to start his own company, so you may not get a reply from him..

Hi Non Vtec, do you still have your Crower cam card with you for your K20 Stage 2 cams? Do you know what degree is recommended by crower for the intake centerline using "Lobe center" method of degreeing? I think my exhaust cam might be off by a few degrees and I want to dial it in correctly using adjustable exhaust cam sprocket. Please help, thanks.

This is what I've got from degreeing my cams:
http://www.snc.com.au/jazz/IPSK2.gif

[Non Vtec]

you'd be better off adjusting your exhaust cam on a dyno to find where it makes the best power, not just using the specs. I know its an arse of a job on the k20a's but you'll see good gains...

[dsp26]

More Duration = More Peak HP
More Lift = More TQ

massively aggresive cams in terms of duration/lift kill bottom end power due to overlap. having vtec is obviosuly a benefit to allow the best of both worlds. Hondas are the only NA cars that have such aggresive profiles.

and as per what has been said already, do ALL YOUR TUNING ON A DYNO!!!