Author Topic: Cam Chain tensioner.... (Read 3343 times)

ev0lution7 · « **on:** April 22, 2009, 08:02:27 AM »

Anyone know anything about this M3 cam chain tensioner??? it seems to look really coool and costs about as much as putting new rubber wheels and parts for the stock one??? i emailed them and called them and got no responce.

ev0lution7 · « **Reply #1 on:** April 22, 2009, 05:21:24 PM »

anyone know about this??

MCRider · « **Reply #2 on:** April 22, 2009, 05:31:33 PM »

Quote from: ev0lution7 on April 22, 2009, 05:21:24 PM

anyone know about this??

I think its considered a very good piece. Mark McGrew is the proprietor of M3. He posts here under the name "kos". He has recently posted about CR750 Steering dampeners.

You may try a PM. M3 has been very innovative in its product line and very successful in AHRMA (I think) racing. I think you've bumped into the biggest problem(s) of contacting him. Likely he's at "the track" a lot, etc.

I was looking at that myself. But I have a full serving of new rubber pieces I've already paid for. For my purposes, rubber will be fine. For M3, their engines live at the 7,000rpm+ range so everything chain related dies early.

ev0lution7 · « **Reply #3 on:** April 22, 2009, 05:45:54 PM »

so the "rubber" stock one when its all new with a "newer" stronger chain... will that hold up to some abuse?? or would a stronger chain and that M3 part be needed...

i'm looking for the most trouble free possible...

MCRider · « **Reply #4 on:** April 22, 2009, 05:54:06 PM »

Quote from: ev0lution7 on April 22, 2009, 05:45:54 PM

so the "rubber" stock one when its all new with a "newer" stronger chain... will that hold up to some abuse?? or would a stronger chain and that M3 part be needed...

i'm looking for the most trouble free possible...

I have no personal experience with the M3 part. It looks really cool, but I think is way overkill certainly for my application.

An HD chain with the rubber parts has been used by billions of us. My previous engine, 888cc with ported head, cam , valve springs etc., spent its life under 8,000 rpm though I was never shy to go there. It had the HD chain and rubber pieces, 50,000 miles and I'm thinking of using the chain over (not really, but I could). The rubber was showing wear, but could have gone another 50 I'd bet. So that set up is up to heavy street use no problem.

Those 1970 CR750s puked their chains (HD I think) in 200 miles. Mark is getting more life than that, but i bet he replaces them often, even with his tensioner. So racing use is simply hard on parts. If you're building a 10000rpm road or drag racer, you'd want the M3 part.

But direct to your question, an HD chain with the M3 tensioner at street speeds is probably the most trouble free. I'd like to hear from someone whos actually used it, too, as...

Sometimes racing parts are built for the extreme stress and replace cycle, and not so much for the long distance drone along the highway, occasional funny business, kind of use

mrosso · « **Reply #5 on:** April 22, 2009, 05:54:49 PM »

There's an interesting tid-bit about cam tensioner mods here [urlhttp://www.satanicmechanic.org/valvetrain.shtml][/url]

sparty · « **Reply #6 on:** April 22, 2009, 06:51:19 PM »

Quote from: ev0lution7 on April 22, 2009, 08:02:27 AM

Anyone know anything about this M3 cam chain tensioner??? it seems to look really coool and costs about as much as putting new rubber wheels and parts for the stock one??? i emailed them and called them and got no responce.

I am running the M3 tensioner in my engine. It works well and keeps the chain tensioned perfectly in my Hot Rod engine. See my build page for pics.

Sparty

MRieck · « **Reply #7 on:** April 22, 2009, 07:46:22 PM »

I've used them over 5 times....does that make me an expert?

ev0lution7 · « **Reply #8 on:** April 22, 2009, 08:15:54 PM »

ya i think sooo....

do you like them are they pretty durable on the street?

MCRider · « **Reply #9 on:** April 22, 2009, 08:18:33 PM »

Quote from: MRieck on April 22, 2009, 07:46:22 PM

I've used them over 5 times....does that make me an expert?

Well...sort of. It means we can pester you with questions.

It still requires at least 1 rubber roller and the front rubber slide? Or what?

And are you using them without reservation in a motor that's intended to be run at a lot of modest speeds, occasional blasts, and hopefully never come apart again?

Seriously, some quick opinions. THanks.

Sam Green Racing · « **Reply #10 on:** April 22, 2009, 08:27:39 PM »

Recomended by Mike, we got him to send us one along with a flat link H/D chain.

It's perfect.

Sam.

ev0lution7 · « **Reply #11 on:** April 22, 2009, 08:33:18 PM »

with this setup would you feel comfortable revving over 8.5k for race?? and not have breakage?

bwaller · « **Reply #12 on:** April 22, 2009, 08:41:47 PM »

That's what they were designed for.

ev0lution7 · « **Reply #13 on:** April 22, 2009, 09:00:54 PM »

designed for and actually doing 2 different things...

i was "kinda" asking the guys who do it thier motors... every race... because i dont want to snap a chain if i "RACE" it

Sam Green Racing · « **Reply #14 on:** April 22, 2009, 09:27:34 PM »

Quote from: ev0lution7 on April 22, 2009, 08:33:18 PM

with this setup would you feel comfortable revving over 8.5k for race?? and not have breakage?

In Mikes motor it copes with 98bhp but in our case, the motor was set up to be reliable and only produces power up to 8,900 rpm. (86bhp)
It saves having to worry about stronger rods and regular strip downs.
Something that the motor dose do is produce a whopping 62ftlb of torque and the tensioner takes it all in it's stride.

Sam.

ev0lution7 · « **Reply #15 on:** April 22, 2009, 09:48:56 PM »

how would the stock tensioner fair to the 86?? and the 8900 rpm limit...

MRieck · « **Reply #16 on:** April 23, 2009, 06:29:42 AM »

Quote from: MCRider on April 22, 2009, 08:18:33 PM

Quote from: MRieck on April 22, 2009, 07:46:22 PM
I've used them over 5 times....does that make me an expert?
Well...sort of. It means we can pester you with questions.

It still requires at least 1 rubber roller and the front rubber slide? Or what?

And are you using them without reservation in a motor that's intended to be run at a lot of modest speeds, occasional blasts, and hopefully never come apart again?

Seriously, some quick opinions. THanks.

No rollers but you maintain the front slide. It works very well as there are no moving parts. I think the rivets holding the 3 pieces together could be better but that's it. Honda used steel sprockets etc in the CR's and Yosh made a unit too BUT they all employed moving parts.....a real weak link. My bike has had 10,000RPM dyno runs and been banged off the limiter many times with no problems.

MCRider · « **Reply #17 on:** April 23, 2009, 09:10:57 AM »

Thanks!

mrosso · « **Reply #18 on:** April 25, 2009, 12:55:07 AM »

Anyone try this?

]http://www.satanicmechanic.org/valvetrain.shtml]

MCRider · « **Reply #19 on:** April 25, 2009, 04:13:22 AM »

Quote from: mrosso on April 25, 2009, 12:55:07 AM

Anyone try this?

]http://www.satanicmechanic.org/valvetrain.shtml]

What specifically are you alluding to? There are many items on that page. The M3 tensioner we are discussing now.

MRieck · « **Reply #20 on:** April 25, 2009, 05:45:03 AM »

Quote from: MCRider on April 25, 2009, 04:13:22 AM

Quote from: mrosso on April 25, 2009, 12:55:07 AM
Anyone try this?

]http://www.satanicmechanic.org/valvetrain.shtml]
What specifically are you alluding to? There are many items on that page. The M3 tensioner we are discussing now.

I assume he is pointing out the CB450 tensioner wheel swap.

MCRider · « **Reply #21 on:** April 25, 2009, 05:49:18 AM »

Quote from: MRieck on April 25, 2009, 05:45:03 AM

Quote from: MCRider on April 25, 2009, 04:13:22 AM
Quote from: mrosso on April 25, 2009, 12:55:07 AM
Anyone try this?

]http://www.satanicmechanic.org/valvetrain.shtml]
What specifically are you alluding to? There are many items on that page. The M3 tensioner we are discussing now.
I assume he is pointing out the CB450 tensioner wheel swap.

Oh I see that now. Any comments on the wheel swap? Is it the top sprocket style wheel? Seems if you put a sprocket in place of the roller, you're assuming the chain will line up with the sprocket teeth on both sides of the wheel?

mrosso · « **Reply #22 on:** June 03, 2009, 10:42:03 PM »

This thread sort of died a premature death. Anyone try the CB450 sprocket mod for CB750 cam chain tensioner?

ev0lution7 · « **Reply #23 on:** June 04, 2009, 09:16:44 AM »

ya i wish i had an answer to the 450 wheel as well but i think it died because i made up my mind to get KENS GRIT KIT2... and then just break down and buy the M3 tensionser!!!

754 · « **Reply #24 on:** June 04, 2009, 09:27:40 AM »

Evo, my stock one has seen 11K in an 836, hundreds of times for short periods of time, and never let me down. But I will try to run a better setup on my bigger motor.

I will describe what I found in my 69 lower end, then anyone with info can coment.

Appeared to be stock chain and tensioner bracket.
BUT.. small roller is a steel sprocket, and the bigger one is steel as well.. not sure if some of that is 450 parts , one-off, or something offered "Back in the Day"?

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Author Topic: Cam Chain tensioner.... (Read 3343 times)

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