Hello ,

So I purchase a set of kelford tx280 cams for my evo from jms racing in san antonio they were a set of used cams they had and gave me a good deal, well im degreeing the exhaust cam shaft and the max lift specified by Kelford is 11mm I checked 10 times and I get 10.85mm I placed my dial guage tip at different places on the retainer and I always get 10.85mm I looked at Kelford's web site and they only have a 10.5mm and 11mm lift did I get a different cam? I try to follow the cam spec and im off by 11 degrees from center line I have 104 and the spec sheet calls for 115.
Any ideas I called JMS but they say they are kelford's my intake cam does checks in with advertised lift of 11.5mm

 

What was the manufacturing dates on them? the older Kelfords are different.

 

Are you measuring lift at the valve with the valve springs in or do you have a soft test spring in? 6 thou of deflection in the cam is pretty normal with the valve spring installed. Try a test spring on that cylinder and see if you get your 11.0

 

No i do not have a test spring im testing with the stock springs and retainer 10.87mm to 11mm is is .13mm maybe u are right , now what is disturbing is the fact that in order for me to get a center line like the manufacture states on the spec sheet of 115 I advanced the gear to its max and im only able to get 111 center line.
So this makes me think that the exhaust cam is not correct.

 

okay this is the max lift register on both cams using a stock spring and 0 lash

intake .420 10.66mm
exhaust .413 10.49mm I measured them 7 times result was the same

I dont know ,im just gonna return these cams and buy a set of new , im not longer sure they are kelfords
can some hel identify these

thanks

 

any chance that the lifter is bleeding / compressing a bit under the load?

what is the lift if you subtract the base circle from the nose of the cam & multiply that by the rocker ratio?

i have seen 2 published rocker ratio's for the 4g63, 1.7:1 is common, while kelford advertises 1.73

GL

 

well hopifully somebody from the shop comments on them

 

Im using a solid lifter adjust to 0 lash , I spoke to the guy that sold the cam set and now he is telling me that they are GCS S2 274 272 cams, I checked GCS site and they only advertise a 274 not 272 im waiting for them to send me the spec sheet and I will try again.