Topic: Yoshimura? Cam Identification

[Greggo]

Hey Guys, I need some help identifying this cam.  I was told it is Yoshimua, but it doesn't have the B stamped on either end.  The notched end is unmarked.  The other end looks like this:





I won't be able to measure it until later this week.  If no one recognizes this, I'll report back with the lift and duration numbers for more help.

Thanks!

[Bill/BentON Racing]

Yosh usually had A or B on end of cam.Bill

[Greggo]

Yosh usually had A or B on end of cam.Bill

Have you ever seen one without those markings?  The guy told me he used to be a Yoshi distributor.  I'll try and measure the lift/duration tomorrow at my pop's shop.

[Tim2005]

Greggo,  have a 400f Yoshi cam without end markings, I also have another one with the markings & otherwise identical.

[Greggo]

Greggo,  have a 400f Yoshi cam without end markings, I also have another one with the markings & otherwise identical.

Thank you Tim, that's kind of a relief. 

[jaguar]

I need to get some pictures of my cam that i was told was a yoshi.
It too has no markings

Looks wild....

What is a good way to measure the lubes on the cam?  i have calipers.
I would love to know more about mine, it came out of a pork chopped cranked 812 with RSC rods

[voxonda]

I lay the cam in two v-blocks and place gauge on the lobe(s). When I draw up the lobs, I use a degree wheel.

[Greggo]

I lay the cam in two v-blocks and place gauge on the lobe(s). When I draw up the lobs, I use a degree wheel.

The cam is out for measurement.  I will know the numbers next week.  In the meantime, Jerry Rxman Griffin has provided me with the original documentation that came with the Daytona cams back in the day, so I thought I'd share.

[MRieck]

"contact between the the piston and valve can cause considerable damage". Yeah.....no sh!t.

[Bill/BentON Racing]

Yeh,to your engine and wallet!!!!

[Greggo]

Had the cam measured by a friend of my pop's shop. 

Edited 2/22/12
Intake Lift: .391"
Exhaust: .353"



Hope Jerry doesn't mind me posting the contents of this PM.  It contains valuable info:

The numbers on my cam are similar to what Jerry got from his Daytona.  He got an intake lift of .382"  I got .391"  His exhaust lift was .338" I got .353" 

I wouldn't base it soley on the marking on the end of the cam. I'd be more concerned about the lift and the lobe profile. I have more specs/info if you get it and it doesn't have that.

Hey Jerry,

I got the cam, and I'm having it measured.  I'll be able to report back next week.  Do you know what the lift and duration numbers are for the daytona vs. road specials?

Cheers!
Gregg

I can give you numbers for the Daytona only if that'd help. I still have all the original literature that came with my cam.

Tappet Clerarance: street int 0.10mm exh .10mm  racing int 0.15mm exh 0.15mm

Duration: readings taken at .040" valve lift with tappets set at .004 Int opens 23 btdc closes 53 abdc 256 degrees exh opens 53 bbdc closes 23 atdc 256 degrees

Ignition timing +3 advance from stock

Int max lift 9.72mm 105 lobe center  Exh max lift 8.60mm 105 l.c.

I have this stuff scanned in somewhere. I'll see if I can locate it for you.

[Greggo]

Any advice guys?  Seems like a pretty wild cam.  What does the extra exhaust lift mean for the powerband?

It doesn't look as pretty now that it's been measured, so I'm worried about reselling it - just doesn't look quite NOS anymore.  I think it was worth it to get the numbers though. 

[turboguzzi]

I lay the cam in two v-blocks and place gauge on the lobe(s). When I draw up the lobs, I use a degree wheel.

Rob, your method would work only for cams for bucket style operation,

on cams for rockers, timing & lift at teh cam would be different than at the valve because of the arm ratio and changing angle of the rocker arm...

[voxonda]

Only do that to check the cam. Of course you need to mount the cam to do the actual timing.

Cheers, Rob

[MRieck]

Any advice guys?  Seems like a pretty wild cam.  What does the extra exhaust lift mean for the powerband?

It doesn't look as pretty now that it's been measured, so I'm worried about reselling it - just doesn't look quite NOS anymore.  I think it was worth it to get the numbers though.

Not that wild. #'s like that would be good with an 836 kit.

[Greggo]

Any advice guys?  Seems like a pretty wild cam.  What does the extra exhaust lift mean for the powerband?

It doesn't look as pretty now that it's been measured, so I'm worried about reselling it - just doesn't look quite NOS anymore.  I think it was worth it to get the numbers though.

Not that wild. #'s like that would be good with an 836 kit.

That's good to hear!  So, it's pretty streetable with those numbers?  Is that a milder grind than the Daytona?

[MRieck]

O forget what the #'s are for that Daytona cam...look at Satanic Mechanic site. Those #'s are like a slightly hotter Megacycle 125-65 cam. You can look at those numbers on that same site.

[Greggo]

O forget what the #'s are for that Daytona cam...look at Satanic Mechanic site. Those #'s are like a slightly hotter Megacycle 125-65 cam. You can look at those numbers on that same site.

Nice, thanks Mike!  I think I'll keep it then, for when my '76K is ready for a big bore.

[Sam Green Racing]

The Daytona cam is pretty close to the Kenny Harmon F grind from Megacycle, a nice cam.

125-F .385" 270° 107°      Kenny Harman “F” grind. Use racing pistons and    28 btc/62 abc .005"
 billet .330" 278° 110°       springs. Mini sprint, mid-range and top-end.           69 bbc/29 atc .005"
 
Like Mike said, yours is much like the 125-60, a great cam Gregg, we had that one in the CR836 in my avatar.

125-60 .375" 257° 103.5°    Best all around cam for street and road with K-836     25 btc/52 abc .004"
            .354" 253° 103.5°    kit and R/D or K.P.M. springs. Strong mid-range           50 bbc/23 atc .004"
                                             great top-end. Lobe clearancing needed

Sam,

[Greggo]

Thanks for all the info guys!  I'm going to check with Jerry to see if he has the specs on the road special.  I was told this is a Yoshi cam from waaay back by the gent, who claimed to have been some kind of Yoshimura distributor or dealer or something (I can't remember).  Anyhow, it'd be nice to be able to claim it's a Yoshi    Either way I'm very pleased to know it's suitable for the rebuild I'm inching my way towards on the Gunfighter's motor.  Now to find a spare motor 

[MRieck]

It is a billet cam for sure (not hard welded). I have always liked Yosh products. I have a set of their cams in my busa, ran a set in my FJ1200 for years and had one in my CB (along with pistons etc). Still have the Yosh name hand painted on the CB's rear cowling...Sam...and many others...have seen it. 

[Greggo]

It is a billet cam for sure (not hard welded).

What about the cams in this pic?  I also find it interesting that the numbers JimRXmangriffith provided of his known Daytona cam don't match the numbers on Satanic Mechanic.  I couldn't find any matches on there for this cam.  The 125-65 was definitely closest.

[Jerry Rxman Griffin aka MuthaF'er]

Did I post this one? Open the attachment link. The numbers above the cam lobe pictures ( .383 and .3386) were written on there by me. I converted the top "max lift" numbers to "English" instead of the mm figures. Intake 9.72mm =  .383" and exhaust 8.60mm to .3386". That sheet was provided with my cam. I did NOT do an actual measurement. It's a PDF and I can't load it to Photobucket, at least I don't know how to, since they want JPEG's. My cam was from fall 1976 so they could have changed along the way. Would it be possible that the road cam had higher exhaust lift? Better lower rpm HP possible? If so why would the full race have less? O know it wouldn't need the middle rpms as it stayed at top end but why? Cam gurus chime in!

I can't read that card of your's but I think I see TT Special which would be the Road Special I think. My card has part #YH750-112-00 and Daytona Special on it. My parts price list has the "Road Special Cam" as part #111-00 and the Daytona as 112-00. Retail back then was 107.50 with dealer cost of 76.86 for the Road Special and 130.00 and 92.95 for the Daytona. Just for a FYI their big valves were +1.2mm intake and the exhaust was "valve exhaust big valve" with no size given.     

 

[Greggo]

Did I post this one? Open the attachment link. The numbers above the cam lobe pictures ( .383 and .3386) were written on there by me. I converted the top "max lift" numbers to "English" instead of the mm figures. Intake 9.72mm =  .383" and exhaust 8.60mm to .3386". That sheet was provided with my cam. I did NOT do an actual measurement. It's a PDF and I can't load it to Photobucket, at least I don't know how to, since they want JPEG's. My cam was from fall 1976 so they could have changed along the way. Would it be possible that the road cam had higher exhaust lift? Better lower rpm HP possible? If so why would the full race have less? O know it wouldn't need the middle rpms as it stayed at top end but why? Cam gurus chime in!

I can't read that card of your's but I think I see TT Special which would be the Road Special I think. My card has part #YH750-112-00 and Daytona Special on it. My parts price list has the "Road Special Cam" as part #111-00 and the Daytona as 112-00. Retail back then was 107.50 with dealer cost of 76.86 for the Road Special and 130.00 and 92.95 for the Daytona. Just for a FYI their big valves were +1.2mm intake and the exhaust was "valve exhaust big valve" with no size given.     

 

The pic I posted in my last post was not my cam, just an example pic, as Mike seems to be saying that all Yoshimura cams were billet...

[Bill/BentON Racing]

Jerry,your Daytona have a B on the end? Thanks,Bill