I've noticed that the specs of the Crower 404s are different compared to the website and the tech card that i received with the cams.

on the website, it says "advertised duration": 243/241
on the tech card that came with my cams, it says "advertised duration": 300/290

so my question is what's the difference? I always get people asking me what the specs of my cams are and I'm not sure what to tell them.

why is there such a big discrepency between the specs on the website and the specs on the actual tech card?

Apparently, I'm not the only person to have come across this. This isn't my tech card, as I'm at work and don't have access to a scanner, but I found this pic online, so I thought I'd use this as an example:


here are the specs on crower's website:
http://www.crower.com/misc/cam...62404

also....why does the website state the clearence is .006/.008 HOT, while on the tech card, it says .006/.008 COLD?

so my question is for those of you with crower cams, can you compare the tech card that came with your cams and the website specs and post your results?

I don't know much about the manufacturing process, but I imagine they are machine ground and can understand if the error rate is +/- 5 degree duration, but we're talking a 49 degree difference in duration....

 

when i got my 403s i noticed the same thing, so i don't know what to tell you but that it's obviously something they do often. and as far as the valve adjusting goes, always do that cold.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ljoe &raquo;</TD></TR><TR><TD CLASS="quote">when i got my 403s i noticed the same thing, so i don't know what to tell you but that it's obviously something they do often. and as far as the valve adjusting goes, always do that cold. </TD></TR></TABLE>

Thanks, and just out of curiosity, how far was yours off?

and if that's the case, then i'm wondering if it's safe to say crower underrate's their products?

I'll drop crower an email when i get home from work tonight.

 

yeah now that i look at it this is really wierd.
the numers on mine are as follows, and these are for 403s

intake: duration: 297 lift: .422
exhaust: duration: 292 lift: .411

both duration numbers are extremely off of the specs from the website, but then so are the ones for the 404s you put up, so i would actually guess that the website is listed wrongly. the lift specs are also off, but not by nearly as much. only .001 and .002 respectively, but i think the discrepenses with those numbers are because no two cams are alike. that fact is supported by the differences in your card and the card you posted the picture of. that would also lead me to believe that they make each individual spec card for that particular set of cams, which is comforting for some reason. just the thought of a company actually doing things the right way for once

 

Crower 404's are custom ground everytime you order so they varying from cam to cam!

Take me for example mine spec card says:

Crower 62404-2

Intake: 308 degrees with .446 lift
Exhaust: 305 degrees with .434 lift


226/224 @ .050"

lobe separation: 109 degrees

I also noticed my camcard say that the ....

Intake opens at 8.0 BTDC
Intake Closes at 38.0 ABDC

Exhaust opens at 45.0 BBDC
Exhaust closes at -1.0 BTDC

 

hmmm...this is interesting...
well..i guess it's safe to say to go by the tech card that was packaged with the cams.

I'll let you guys know what Crower says.

 

No one really cares what the advertised numbers are, what you really want to know is the duration at .050. Advertised duration is the longer of the two duration numbers since it uses duration as measured from .oo4 or .006. Duration at .050 uses .050 of tappet lift as the opening and closing point for the duration specification. Since there are many different cam points for advertised duration figures, it's more accurate to use the .050 inch point when comparing camshafts.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ludesleep &raquo;</TD></TR><TR><TD CLASS="quote">No one really cares what the advertised numbers are, what you really want to know is the duration at .050. Advertised duration is the longer of the two duration numbers since it uses duration as measured from .oo4 or .006. Duration at .050 uses .050 of tappet lift as the opening and closing point for the duration specification. Since there are many different cam points for advertised duration figures, it's more accurate to use the .050 inch point when comparing camshafts.</TD></TR></TABLE>

Very true.

As I stated earlier.......<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hybrid_vtec &raquo;</TD></TR><TR><TD CLASS="quote">Crower 404's are custom ground everytime you order so they varying from cam to cam!

Take me for example mine spec card says:

Crower 62404-2

Intake: 308 degrees with .446 lift
Exhaust: 305 degrees with .434 lift


<FONT SIZE="3">226/224 @ .050"</FONT>

lobe separation: 109 degrees

I also noticed my camcard say that the ....

Intake opens at 8.0 BTDC
Intake Closes at 38.0 ABDC

Exhaust opens at 45.0 BBDC
Exhaust closes at -1.0 BTDC</TD></TR></TABLE>

 

Crower finally got back to me and this is their response:

"Good question.

We are updating our entire HTML section of our site and will be listing the
advertised specs that are listed on the cam card.

The quick answer is that in the past (html site) we were listing specs off
of the cam lobe itself, which are way smaller than measuring specs at the
valve (cam card).

Thanks for your interest in Crower,"

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Eclypz &raquo;</TD></TR><TR><TD CLASS="quote">Crower finally got back to me and this is their response:

"Good question.

We are updating our entire HTML section of our site and will be listing the
advertised specs that are listed on the cam card.

The quick answer is that in the past (html site) we were listing specs off
of the cam lobe itself, which are way smaller than measuring specs at the
valve (cam card).

Thanks for your interest in Crower,"</TD></TR></TABLE>



So they will be updating soon?

 

yep...that's what he said...
they will line up the specs on the cam tech card and the website.