Author Topic: 836 Cam Choice help  (Read 1652 times)

0 Members and 1 Guest are viewing this topic.

Offline wiskey

  • Full Member
  • *
  • Posts: 44
836 Cam Choice help
« on: February 25, 2013, 02:41:53 PM »
I have a 77 cb750k which will be ridden mostly on the street.
-Stage 2 JMR head port (over-sized intake, HD springs)
-836 kit (older cb350 twin pistons 65mm with valve reliefs cut into the dome. 10.25:1-10.5:1 CR)
-hd cam chain
-Stock rods and Carbs.

Have been looking into cams for a while now. Seems like the general consensus is to go with a megacycle 125-65 or 125-75. My more budget friendly options are some of dynoman's cams (dp295 or dp315) or cycle x (any 63 grind). The lift on the dp cams seem much higher than the cycle x, when does lift become too high for piston to valve clearance, I will still clay the pistons to be on the safe side.

Just looking for some good street cams, something that will still make good power but not a chore to use on the street.


Offline Bill/BentON Racing

  • Really Old Timer ...
  • *******
  • Posts: 6,725
  • Ex Honda Service Manager, Cert. Honda Tech - Racer
    • BentON Racing
Re: 836 Cam Choice help
« Reply #1 on: February 25, 2013, 03:21:31 PM »
When it HITS!!!! No,too many variables,piston,flycut,rod length(stock you said)head milled,cylinder milled,etc.All you named be OK,125/75 and 315 might be more higher rpm power,295 or 125/65 be my choices,not familar much with the'63's.Most time .080-.100" piston to valve be fine,can get closer,but riskier! ;). Now if you want to ride with more power esp up top,125/75 or 315 be great! Bill
BentON Racing Website
OEM Parts | Service | Custom Builds
BentON Racing Facebook
Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985.
______________________________________
1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Black Bomber | 1972 Suzuki T350 | 1973 88cc | Z50/Falcons Pit Bike | 1967 CA100| 1974 CB350 (400F motor)...and more.
______________________________________
See our latest build 'Captain Marvel' CLICK HERE

Offline Sam Green Racing

  • Moderator
  • Really Old Timer ...
  • *****
  • Posts: 16,068
  • I REALLY? hate black rims.
Re: 836 Cam Choice help
« Reply #2 on: February 25, 2013, 03:29:05 PM »
I'd just like to mirror what Billy said, We've used all those cams with a similar set up to yours and the 125-60/65 and DP295 are far and away the best bang for your buck on the street.

Sam. ;)
C95 sprint bike.
CB95 hybrid race bike
CB95 race bike
CB92
RS 175. sprint/land speed bike
JMR Racing CB750A street ET drag bike

Offline wiskey

  • Full Member
  • *
  • Posts: 44
Re: 836 Cam Choice help
« Reply #3 on: February 26, 2013, 05:45:28 AM »
I'd just like to mirror what Billy said, We've used all those cams with a similar set up to yours and the 125-60/65 and DP295 are far and away the best bang for your buck on the street.

I think ill give the dp295 a go. And its hard-welded which is a bonus.

Ill order up the..
dp295
adjustable cam sprocket
degree wheel

anything else ill need to degree the cam?

Offline MRieck

  • Really Old Timer ...
  • *******
  • Posts: 10,560
  • Big ideas....
Re: 836 Cam Choice help
« Reply #4 on: February 26, 2013, 06:46:25 AM »
A dial indicator/holder and TDC piston stop
Owner of the "Million Dollar CB"

Offline wiskey

  • Full Member
  • *
  • Posts: 44
Re: 836 Cam Choice help
« Reply #5 on: February 26, 2013, 10:07:03 AM »
I wrote Dynoman about their DP295 cam and got this in return " You will need to check the clearance in the cam towers, as this cam sometimes requires a little material to be removed due to the size of the lobes."  Has anyone ran into this?

Offline Bill/BentON Racing

  • Really Old Timer ...
  • *******
  • Posts: 6,725
  • Ex Honda Service Manager, Cert. Honda Tech - Racer
    • BentON Racing
Re: 836 Cam Choice help
« Reply #6 on: February 26, 2013, 05:27:07 PM »
Oh,yes,real common on hi po cams,even my Yosh cam on my 550 needed clearancing...it's a GOOD thing! Bill
BentON Racing Website
OEM Parts | Service | Custom Builds
BentON Racing Facebook
Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985.
______________________________________
1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Black Bomber | 1972 Suzuki T350 | 1973 88cc | Z50/Falcons Pit Bike | 1967 CA100| 1974 CB350 (400F motor)...and more.
______________________________________
See our latest build 'Captain Marvel' CLICK HERE