Any damage to stock valvetrain
Evolving Member
Joined: Jan 2004
Posts: 138
Likes: 0
From: Nor Cal
I read it as there were no problems with their RS revving safely to 7500. Again, there is no way in hell that this interference would be noticed unless you install a "flow-bench" spring that allows you to see what is happening behind the shroud of a compressed spring. BTW the 264 and 272 have the same lift 10.8 INT 10.2 EX, so there is no difference between the two cams 264/272 with what we are talking about here....both cams lift the valve the same ammount, the duration is the difference.
Stupid question...I am really not familar with a flow-bench spring so bear with me... How does that work? Is it possible that you are only seeing the wear & contact b/c the flow bench spring itself? Im just trying to understand why you are the only one getting these results.
Originally Posted by NYREDEVO
Stupid question...I am really not familar with a flow-bench spring so bear with me... How does that work? Is it possible that you are only seeing the wear & contact b/c the flow bench spring itself? Im just trying to understand why you are the only one getting these results.
Originally Posted by ogvw
The "flow bench spring" is a low pressure spring fitted to the valvetrain during flowbench testing to facilitate moving the valve by hand. Its just a spring to hold the keepers/retainer together really....
So could that effect the wear pattern? You did not really answer that part of my question?
Evolving Member
Joined: Jan 2004
Posts: 138
Likes: 0
From: Nor Cal
Originally Posted by ogvw
The "flow bench spring" is a low pressure spring fitted to the valvetrain during flowbench testing to facilitate moving the valve by hand. Its just a spring to hold the keepers/retainer together really....
Originally Posted by NYREDEVO
Is it possible that you are only seeing the wear & contact b/c the flow bench spring itself?
Newbie
Joined: Mar 2003
Posts: 5
Likes: 0
From: Portland, OR
Originally Posted by ogvw
No - the spring does not change the travel of the retainer/valve assembly - it just allows us to look at what is happening under the retainer (normally hidden by the OEM spring coils).
We are definitely supporting Revolver cams from now on!
Best regards,
Jeremy
Originally Posted by davidbuschur
The HKS 272's do NOT come in contact with the valve seal, I just went back and checked a head.
David Buschur
www.buschurracing.com
David Buschur
www.buschurracing.com
What am I missing?
CAMSHAFTS
HKS high performance camshafts are CAD designed to optimize torque and horsepower over the widest possible power band. Each camshaft application is offered in multiple profiles, each with their own duration and lift characteristics to suit various levels of tuning. Lower profiles offer substantial gains in power and a broad useable power band throughout the rpm range with little compromise in driveability. High profiles offer greater increases in power, but are tailored for higher RPM range and racing. Increases performance from the HKS camshafts are achieved by: 1) Increasing the duration of valve opening, which increases power at higher RPM, and 2) Increasing lift, which raises torque. All HKS camshafts are made from billets of high nickel content iron alloy, not reground stock units, so they equal or exceed OEM units they are designed to replace. The camshafts are direct replacements and are designed to be compatible with factory followers and valve springs. HKS also offers high performance valve spring sets for limited applications that benefit from stiffer springs when using higher profile HKS camshafts.
HKS high performance camshafts are CAD designed to optimize torque and horsepower over the widest possible power band. Each camshaft application is offered in multiple profiles, each with their own duration and lift characteristics to suit various levels of tuning. Lower profiles offer substantial gains in power and a broad useable power band throughout the rpm range with little compromise in driveability. High profiles offer greater increases in power, but are tailored for higher RPM range and racing. Increases performance from the HKS camshafts are achieved by: 1) Increasing the duration of valve opening, which increases power at higher RPM, and 2) Increasing lift, which raises torque. All HKS camshafts are made from billets of high nickel content iron alloy, not reground stock units, so they equal or exceed OEM units they are designed to replace. The camshafts are direct replacements and are designed to be compatible with factory followers and valve springs. HKS also offers high performance valve spring sets for limited applications that benefit from stiffer springs when using higher profile HKS camshafts.
Evolving Member
Joined: Jan 2004
Posts: 138
Likes: 0
From: Nor Cal
Originally Posted by Jorge T
What I don't understand is like shown in picture 2, it starts making contact at that cam position how come stock cam does not also hit?
Originally Posted by Ted B
Stock Cams Lift:
Int - 10.0mm
Exh - 9.5mm
HKS Cams Lift:
Int - 10.8mm
Exh - 10.2mm
You're talking about a difference of only 0.7-0.8mm for each.
Int - 10.0mm
Exh - 9.5mm
HKS Cams Lift:
Int - 10.8mm
Exh - 10.2mm
You're talking about a difference of only 0.7-0.8mm for each.
Doesn't make sense to me. If the stock cam has plenty of clearance, why would an extra 0.8mm of lift create the interference created in the third photo?