Why is it that some of the cam grinders all seem to measure their cams differently? I was looking at Bisimoto's, Skunk2's, and Rocket Motorsports' websites and it seems they all use a different lift value to measure duration.

Bisi- measures duration at 0.040″.

Skunk2- measures duration at .004" and .050".

Rocket Motorports- measures at 0mm (WTF?).

How are we supposed to compare cam specs and make a good selection for a given combination? The rest of the world has a standard to which one can compare cam durations, whether it be .050 of an inch or 1mm (.040 of an inch).

I'm just askin' for a little more info, that's all.

 

Here at Bisimoto Engineering we now do duration measurements at 0.050", our older cam cards have 0.040" duration measurements but everything now leaves with a cam card which is measured at 0.050"

If there is anything else I can assist you with please shoot me an email:

Randy@Bisimoto.com

 

Each company is different and has their own reasons. If you ask any of those companies dealers that know anything they will be able to help you pick a cam that is right for your setup. Somewhere in my e-mail archive from the past 5 years I have the RM info at .050".

 

Is it true that all businesses mostly post up numbers that can only best be used for advertising? Then also put in the small print disclaimer "results will vary"?

 

Why does RM measure duration at 0mm valve lift? Better yet, how? If I measure a stock cam at 0mm of valve lift, would I be lying if I claimed I measure 360 degrees of duration? 0mm of valve lift is the base circle, is it not?

My main question is why aren't comparable measurements public information for the consumer? Why are .050" specs in 5 year old emails and on cam cards, but not on the websites?

Would you mind posting RM's .050" specs?

 

I am not really following you on this, but in regards to results will vary, that is a generic thing done by any and all companies as what works in test conditions may change in other conditions. So bearing that in mind, there are too many variable and factors to be able to comment on every situation.

Its like saying your car will run flawlessly if you use supreme, well your result will vary if you are at the top of a mountain or if your vehicle is submerged.

Bear in mind that most consumers want to see upper echelon results not lower echelon results, so with that in mind, business wise, companies are more inclined to put up something that is more appeasing to the consumer!

The thing with this EG is that some companies do not post numbers because it is not as hard as people would think to backward engineer numbers off of cams. This is why many companies will give you limited numbers, to protect there own proprietary information.

 

It's cam specs. Why is that proprietary? Anyone who wants to copy your secret cam specs can do so in a matter of minutes. I have yet to see THE ONE cam that makes the most power and torque on any given combination, so until then I don't see why cam specs should be a secret when they can aid the consumer in making intelligent choices rather than costly mistakes.

 

I think right now what it is coming down to is companies are worried about someone taking a cam, getting the specs and then running it to china to have it made!

It is funny how people will look at clones and replicas then assume they are legit. I think the big thing is why risk it when you do not need to you know?

I understand your side of the argument, but at the same time it is a companies information that they developed so if they so choose to safeguard it that is there choice.

 

The ones you see with measurement at .040" were probably made overseas. U.S. cam manufacturers use .050" as a standard and overseas they use 1mm (.040")

 

I think it is an excuse to say that you don't give cam cards because you are afraid someone will copy it. You can't copy a cam from a card. Some people are taking shots in the dark and don't know where to have people set them up.

Bottom line if you want to copy a cam you just buy one and roll it. Simple as that. The best thing for people who want to protect their grinds is to make their specs public info.

 

I don't need to know the cam specs?

 

I like the way you think, lol.

 

I never said that, in fact I wish more people knew what to do with cam specs. I do feel that people should know there cam specs, but to simply compare specs can only give someone so much.

From a business standpoint the information people try to decipher from cam specs is beyond me. Putting knowledge out there that does not necessarily need to be out there in my opinion asks for trouble and simply makes it easier for clones and copy cats to make themselves available.

Actually we do give cam cards with our cams, we understand that enthusiasts may want that information, some may not, but in either event we give them a cam card. Between people actually rolling a cam and having access to the equipment needed are two entirely different things.

In any event it is what it is different people test at different ratings, since there are no standardized measurements I guess that is what really dictates it!

 

I wasn't saying that you didn't give cards. But a lot of people don't and they say that they don't because they don't want people copying their cams.

Anyone with intent to make the financial commitment to copy a cam will find access to a doctor and buying one set to copy isn't all that much of an investment

 

Oh I misunderstood. I thought that's what you were saying with the comment I put in bold. So just how much info is Bisimoto Engineering willing to make available to potential customers in order to make their decisions? What's too much?

I noticed the website lists absolutely zero info about B series cams.

 

True, but I have come to find alot of people are much to lazy to do something like this, but even for myself I would rather not take the risk!

Generally we give lift and duration, our new website isnt fully up so not everything is up!

 

Cool, so will you be measuring durations at 1mm or will you be switching to .050" to measure duration?

BTW, thanks for being so responsive and professional. I'm impressed.