Anyone farmiliar with hks camshaft types for 4age?

[spill86]

I have a set of cams that came in a japanese import ae86 with largeport head. They are both marked with the hks stamp in the centre of the camshafts and only one, the exhaust camshaft, is marked at the end and that reads 256 8.1. the inlet camshaft is scribed in the centre as 264 A with no indication of lift. Going from the only cam card for hks cams for the 4age i could find online the 256 cams only come in 8.0 and the 264 cams come in 8.1. Do i have acombination of old and new hks cams and am i reading off of the wrong cam card for the 256 exhaust cam. Does anyone run this combination of cams on a 4age and what are peoples opinions on running 2 different camshafts like this?

[Dave W]

I have a big port with the same HKS cams. But I believe that the stated lift is actually 8.3mm on both cams. The 8.1 is the valve max opening after the lash clearance is taken into considation. I'm not running with TVIS system on engine and I have a very good exhaust system. With that in mind, the intake cam is set 3 1/2 degrees advance and the exhaust camshaft is 1 degree advance which helped improve the lower end rpm torque.
I would not be concerned about the difference in lift. You are not going to see any real difference between 1 or 2 tenths of a mm in cam lift.
Do not try to degree in the cams at max lift. Set up the cams by reading a equal lift on both sides of opening and close ramps.
Dave W

[ditn]

256 8,35 264 8,1 260 8,0
8,35 is old type i think new type is 8,0 and 8,1.
i think some cards are floating on internet

[spill86]

(11-17-2017 02:48 PM)Dave W Wrote:  I have a big port with the same HKS cams. But I believe that the stated lift is actually 8.3mm on both cams. The 8.1 is the valve max opening after the lash clearance is taken into considation. I'm not running with TVIS system on engine and I have a very good exhaust system. With that in mind, the intake cam is set 3 1/2 degrees advance and the exhaust camshaft is 1 degree advance which helped improve the lower end rpm torque.
I would not be concerned about the difference in lift. You are not going to see any real difference between 1 or 2 tenths of a mm in cam lift.
Do not try to degree in the cams at max lift. Set up the cams by reading a equal lift on both sides of opening and close ramps.
Dave W

I have checked the cam timing off of max lift for both and im getting 114degrees for my 264 inlet and 112for 256 exhaust cam, this is without touching any of the cam timing, they were set up like this but had previously been removed from the engine, the engine is now running silver top rods with wiseco pistons 1mm oversived and silver top throttle bodies with 4-2-1 exhaust. What bottom end are have you in your car? im not sure if the piston and can combination i have will be any good to be honest

[Dave W]

I'm also running a short primary 4-2-1 exhaust, but stock piston and bottom end, W/ a 10.1 CR. The head is fully ported with a ported TB and intake manifold which also has been shorten 50mm.
My intake LCA is 106* and the exhaust is 109.5*
On my motor moving the exhaust LCA, +/- 3* and 6* did not have a noticable improvement in the power curve, while adjusting the intake did.
The only way to find the best LCA's is by testing.
Dave W

[oldeskewltoy]

4AG HKS cam cards I've collected......

early - 256




early - 264




later type 256 and 264

Intake




exhaust





Info collected

current(or recent)
2202-RT093 Toyota - 4A-G(Z)E - Intake - 256 degree - 8mm lift
2202-RT094 Toyota - 4A-G(Z)E - Exhaust - 256 degree - 8mm lift
2202-RT095 Toyota - 4A-G(Z)E - Intake - 264 degree - 8.1mm lift
2202-RT096 Toyota - 4A-G(Z)E - Exhaust - 264 degree - 8.1mm lift
2202-RT097 Toyota - 4A-G(Z)E - Intake - 272 degree - 8.1mm lift
2202-RT098 Toyota - 4A-G(Z)E - Exhaust - 272 degree - 8.1mm lift

Old - only available used, or NOS
2202-RT030 Toyota - 4A-G(Z)E - Intake - 248 degree - 7.45mm lift
2202-RT031 Toyota - 4A-G(Z)E - Exhaust - 256 degree - 8.35mm lift
2202-RT032 Toyota - 4A-G(Z)E - Intake - 264 degree - 8.35mm lift
2202-RT033 Toyota - 4A-G(Z)E - Exhaust - 272 degree - 8.35mm lift
2202-RT034 Toyota - 4A-G(Z)E - Intake - 288 degree - 8.30mm lift
2202-RT035 Toyota - 4A-G(Z)E - 288 degree - 10.*mm lift
2202-RT036 Toyota - 4A-G(Z)E - Exhaust - 304 degree - 8.30mm lift