abdr500

iTrader: (1)

what's the difference between re profiled bd14 cams and bd14 cams made from blanks i take it the both have the same v lift and duration or is it not

Stu @ M Developments

iTrader: (12)

Regrinds have less base height than blanks and give the followers a hard time unless you fit valve stem hats.

abdr500

iTrader: (1)

Stu @ M Developments
thank you .so are the valve lift the same on both re pro and blanks i dont understand how a cam would give the follwer a hard time both the std cam and bd14 valve lift are allmost the same only 8.5 is std i belive and 8.9 is the bd14 hope fully you can correct me on this

Stu @ M Developments

iTrader: (12)

No, of all the various BD14,s 15s, 16s etc ive seen they all bloody differ from both each other and intended specification. In fact, we had one set measured and they were bloody standard.

The cam gives the follower a hard time as it operates in a higher position than its design was intended for due to the metal removed from the base circle.

Anonymous

People seem to forget that the lift is the different between the front of the lob and the back, and that you can NOT increase the front height when you reprofile, so all you can do is remove from the back, this means the lifts have to be taller and hence are not working in the way they were designed to and it can shorten their lifespan accordingly, i would imagine that there is a greater sideloading on the valve guides as well potentially, its certainly the case on cars with rockers when the valve train geometry gets messed around with like this but i dont have enough experience of it on OHC engines to say if the same is true,

Stu, can you comment on that?

Anonymous

PS

Ive also seen cams (although not specifically these ones) vary WILDLY from the spec they are supposed to be, from both piper and kent.

Stu @ M Developments

iTrader: (12)

Unsure on the side loading idea, not something i have ever given much thought on an DOHC due to teh far more direct action of the cam follower arrangement, but either way, repros arent the way forward IMO.

Buy blanks.

Rick

cams

Is it SO bloody difficult to make one "exactly like it says on the tin"????!!

GARETH T

well its hard to shape the cam profile right with a file,,,,, but shouldnt be hard on a cnc profile cylinderical grinder

Stu @ M Developments

iTrader: (12)