This is new cam gear with serrations incorporated in its design to eliminate slippage. I know this has been an issue for tuners like myself, and hopefully this is an excellent solution for D, B, H and F engines. Thoughts??

 

great design...

i read about these on your site a bit back.

i'm very impressed with what i've seen from you so far on my buddies H-to-D adaptor kit (Al from michigan, used to be my car!)

100% sure it'll be very well made

 

i don't feel safe with only three bolts... i have seen the AEM ones slip alot...... other then that nice gear...

 

looks great as usual...now make me some for our NSX.
Mikey

 

Hey Mikey,

They lettin' you have internet privileges now or did you make parole?

Thawley

 

Mikey,
how things going in Sin City??
Comptech make some really cool one that has zero possibility of slip for the NSX
As usual, Comptech is the pioneer for innovative design. I'm pretty sure, in due time people will copy all this design.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .1type. &raquo;</TD></TR><TR><TD CLASS="quote">i don't feel safe with only three bolts... i have seen the AEM ones slip alot...... other then that nice gear... </TD></TR></TABLE>

1type: If you look closely at the second photo, you will notice serrations that exist on both inner faces of the cam gear. That prevents slipping, even if one bolt was used (even though not recommended ). The gear is made of 6061 aluminum, and hard anodized to to 65 Rockwell hardness. We have also burst tested it over 12,000 RPMs.

Andrie,
A super lightweight design, and a balanced assembly are very important to us (yes, we do balance our gears). The addition of a bolt, even in close proximity to the centre of the assembly, negates our second purpose.

Pineapple, how are you? I will call you soon on that!

Thanks for the feedback, guys.


Modified by Bisimoto at 6:09 AM 1/12/2007

 

Thawley.. Yeah I snuck on the internet in between tuning.

Andrie..Will you be attending the cali speedway time attack?

Bisi.. Gimme a call when you get a chance.
Pineapple

 

Bisi,

I understand the important of lightweight. However, does it outweigh the slipping issue. Although I understand with your design, it is significantly reduced.

That being said, in this kind of situation, isn;t the most important is Polar Moment of Inertia? A heavy part near the center is better than on the outer part, isn't it?

 

Mikey,

no, I won't be at Cali speedway. Unless someone is asking me to drive. What date is it anyway? I've been very busy preparing for this season and buttoning up a few sponsors.

 

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

I understand the important of lightweight. However, does it outweigh the slipping issue. Although I understand with your design, it is significantly reduced.

That being said, in this kind of situation, isn;t the most important is Polar Moment of Inertia? A heavy part near the center is better than on the outer part, isn't it?</TD></TR></TABLE>

Andrie,
Could you kindly explain your "significantly reduced" comment?

The Bisimoto Cam Gear a "no slip" sprocket, incorporated with a lightweight design.

Yes, physics dictates that weight towards centerline has less an effect, however, it does not negate a balance issue.

 

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

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

I've seen 2 brands that used this design back in the late 90s/early 00s, I forgot the names, but alot of people used them. Mostly for B-series though.

 

first thing i noticed was the interesting hardware, bisimoto.

while it doesnt make it IMPOSSIBLE to slip, it certainly helps to have the serrations. the serrations will just transfer the shear force to a tensile force on the bolt and cause it to stretch. if it can resist the stretch, it should, then its fine.

also, chance of failure is repeated adjustment and something getting inside the teeth of the serrations and cause misalignment and not fully seated. but that would be user failure i suppose.

i wonder how you made radially spread out serrations tho. (im guessing theyre not straight cut, or it wouldnt work properly...) thats some trick CNC coding on MasterCAM there...

 

I've been to the manufacturing facility these are made and its top notch. They have the proper tooling, machines, engineering team to make these things work right. and not just copy other styles like other brands.

 

btw, it was a compliment.

 

Bisimoto,

I would be the first one to tell you that I'm no engine expert. Heck, I went to Mid Ohio with one of the lowest powered K-series.

However, I'm an engineer. Some is just intuitive for engineer. And when I said the chance of slipping is significantly reduced is just that. To call it eliminated, I think would not be too far from the truth, given the application. It is just me nitpicking.

I'm also not familiar with other products to comment too much. But as far as I can say, putting a serated area is definitely a big improvement to combat slipping. That being said, I ran my B series for 2 years and never experience any slipping. So, what do I know.

 

my screen is not that great. where r the "serrations"?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nello a. &raquo;</TD></TR><TR><TD CLASS="quote">my screen is not that great. where r the "serrations"?</TD></TR></TABLE>
It's not your screen. He needs a good photographer with macro lens to show the serrations.

 

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

1type: If you look closely at the second photo, you will notice serrations that exist on both inner faces of the cam gear. That prevents slipping, even if one bolt was used (even though not recommended ). The gear is made of 6061 aluminum, and hard anodized to to 65 Rockwell hardness. We have also burst tested it over 12,000 RPMs.

Andrie,
A super lightweight design, and a balanced assembly are very important to us (yes, we do balance our gears). The addition of a bolt, even in close proximity to the centre of the assembly, negates our second purpose.

Pineapple, how are you? I will call you soon on that!

Thanks for the feedback, guys.


Modified by Bisimoto at 6:09 AM 1/12/2007</TD></TR></TABLE>


Hey Bisi,

Sorry we missed you for dinner and drinks at PRI. One question about the radial teeth on your cam gear? What is change in cam clocking angle for each adjacent tooth engagement? It seems to me that there is too much dead material (stress speaking) on most of the cam gears at the I.D. of the cam belt tooth region. A tensioned belt places a negligible bending stress on the perimeter material and so the only stress really is due to stress at the tooth imparting a shear stress to the material beneath the tooth. Since the shear area is large, even a very powerful engine that imparts a large belt tension onto the cam gear will result in a relatively small shear stress. The largest stress will be in the material close to each of the spokes (or cam gear web as it is also know as) due to a geometrical stress concentration. Since rotational inertia should be reduced to a minimum safe level, this seems to be an area where some performance improvement could be obtained.

The Comptech gear looks very heavy in comparison to Bisi's design. But I think Bisi is headed in the right direction for virtually eliminating slippage, since each bolt must loosen a bit before any mechanical disengagement could occur.

Just my two cents.

 

Andrie,
I am an engineer as well: it is always great to meet someone who shares similar academic credentials. A pleasure indeed. Maybe we can work together on some future projects, even with, dare I say, K series powerplants!

Johnny,
It was a shame that we did not get together last year. I am sure that an opportunity will arise in the future. Nonetheless, each "locking increment" represents 2 crankshaft degrees (better yet, 1 mechanical cam degree).

The feedback here is great. Maybe it is time for me to build a road race vehicle.

...any thoughts, Thawley?

 

are the D series available yet?

 

I'm interested in a D series application as well.

Oh, I'm an engineer too!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bisimoto &raquo;</TD></TR><TR><TD CLASS="quote">Maybe it is time for me to build a road race vehicle.

...any thoughts, Thawley?</TD></TR></TABLE>

I am reminded of what the legendary stockcar driver, Curtis Turner once said: "Drag racing is like masturbation. It's kinda fun to do, but not very fun to watch."

You are pretty good at it, and I can understand your passion (for drag racing, that is...). But selfishly, I'd have even more fun at the NASA races if you were there too.

Here's the Rule Book for Honda Challenge.
Here's the NASA CCR.

(See you Tuesday.)

 

Hey ....what's wrong with doing both?
mikey

 

I sold out of my D and H series units...and will have some later this coming week. I am currently taking orders as we speak. I have B and F units in stock, though.

Thawley, I look forward to discussing this on Tuesday.

Mikey...both it is