what is a good range of degrees before bottom dead center that most honda cams open?

if you have any specifics on a certain cam, please post it and the manufacturer.
im looking for any honda cam for any series motor, aftermoarket or stock.

thank you.
-derek

 

is this ? too difficult?

 

There's a better number to look at than the ex opening.


You can discuss this with Don more when you are ready to build you motor.

 

Robert i need some dykem.

I just figured, you being a lackey and all...

 

I thought you needed a flow bench?

 

I do! Until them, im stuck with going to my old employer every time i want to "see" something.

 

i know but im just curious about the exhaust for now.

-derek

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Don Lackey &raquo;</TD></TR><TR><TD CLASS="quote">There's a better number to look at than the ex opening.


You can discuss this with Don more when you are ready to build you motor.</TD></TR></TABLE>

You really enjoy keeping people in the dark, don't you?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dfoxengr &raquo;</TD></TR><TR><TD CLASS="quote">what is a good range of degrees before bottom dead center that most honda cams open?

if you have any specifics on a certain cam, please post it and the manufacturer.
im looking for any honda cam for any series motor, aftermoarket or stock.

thank you.
-derek</TD></TR></TABLE>
At what? .010, .020, .0404, .050? BC5's open @ 46 BBDC @ .100 lift VTEC lobe 25 BBDC @ .100 lift on primary.

 

why does lift come into anything for the cam opening xx degrees before bdc? im just looking for the instant that it begins to open.

if it does matter, then:
what is more common lift?
and im looking for the vtec opening thanks for bringing that up.

 

Common number are .040 JDM .050 USDM. If you are looking for "seat to seat" just use the advertised duration, and figure it out from the lobe center. 310 EX. duration @ 110 ctr line = 85 degree opening.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dfoxengr &raquo;</TD></TR><TR><TD CLASS="quote">why does lift come into anything for the cam opening xx degrees before bdc? im just looking for the instant that it begins to open.

</TD></TR></TABLE>

easier to pick a number like .050" than it is to figure out the instant the valve actually leaves the seat

 

If you are looking at duration measured from 0.0001" lift the duration could be 720 degrees, (more than always open). This is not really informative.

 

gotcha, just tolerances.

ok then how do you know the lobe center w/out measuring?
and how you got 85* opening bbdc from 310 dur, and 110 lobe centers by:
[ center line degrees - ((360 - dur.) / 2) ] correct?

-derek

 

I know the lobe center because Crane, Crower, Skunk, Rocket, Elgin, Comp Cams, Isky, Web all publish it for their cams. You might want to read some of there catalogs or web site's on the "how to" stuff. Elgin, Web and Skunk have good "how to" pages for Imports.

 

sweet thank you.

-derek

 

Lobe center means half of your duration occurs before this point and half ocurrs after this point. So the calculation for opening of 85 BBDC for 310 duration at 110 lobe center can be computed as follows.

110 + (310/2) = 110 + 155 = 265 degrees before TDC

= 265 - 180 degrees = 85 degrees BBDC. (in words 265 degrees before TDC is 85 degrees before BDC, BDC by definition is 180 degrees from TDC.)

Lackey math at it's finest.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Combustion Contraption &raquo;</TD></TR><TR><TD CLASS="quote">I do! Until them, im stuck with going to my old employer every time i want to "see" something. </TD></TR></TABLE>

When you unlock the "mystery" of flow call me because you will know exactly what I am talking about.

Almost as good as scoring for the first time. LOL.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Don Lackey &raquo;</TD></TR><TR><TD CLASS="quote">

When you unlock the "mystery" of flow call me because you will know exactly what I am talking about.

Almost as good as scoring for the first time. LOL.</TD></TR></TABLE> When will that happen for you?

 

My 19 year old French Polynesian GF is still at the Port of LA waiting for customs to release her. Something about import duties.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91SiZ6 &raquo;</TD></TR><TR><TD CLASS="quote">You really enjoy keeping people in the dark, don't you?</TD></TR></TABLE>


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bruce Lee &raquo;</TD></TR><TR><TD CLASS="quote"> "It's like a finger pointing away to the moon. Don't concentrate on the finger, or you will miss all the heavenly glory.</TD></TR></TABLE>

 

"Awwl duh hebenly Glooree." Bruce standing there slapping the head of a noob student. Bruce wearing some crazy MMA underwear and gloves with wind blowing in his 70's hair do.

Bruce

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Don Lackey &raquo;</TD></TR><TR><TD CLASS="quote">"Awwl duh hebenly Glooree." Bruce standing there slapping the head of a noob student. Bruce wearing some crazy MMA underwear and gloves with wind blowing in his 70's hair do.

Bruce </TD></TR></TABLE>

things to do before i die

1. get *** kicked by bruce lee
2. wreck my crx in the "corkscrew" at laguna seca

at least i know one of them may happen at crxpo 2007. both can not on the same day. not because bruce is dead, but because my head would explode from sheer amazement.

 

One of my favorite movies.

The thing you missed is that Bruce was still teaching in that lesson. If you asked me if you're supposed to lead with your heel during a side kick and I answered you with, "there's a better way...ask someone else" I'd be a pretty poor martial arts instructor. I'd tell you to lead with your hip so you'd at least have a point of reference for gaining a better understanding of the technique. I wouldn't expect any layperson to understand things the way I do. But that's just the teaching technique I've been successfully using for ten years.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xDEFTONESx &raquo;</TD></TR><TR><TD CLASS="quote">


</TD></TR></TABLE> So where do you like the EX events to be? Can you add some insight to the question? Do you like 106 0r 108 EX. centerlines on the cams you test?