1. change to the valvesprings that were proven not to coil bind at the cam's max. lift on a Spintron test but not go overly stiff to create excessively high valve seat pressures (stock 40 lb., Toda valvesprings 50 lb., max. acceptable range is 70-90 lb. at 33.66 mm installed valvespring height) causing wear.
if you don't upgrade the valvesprings, even though the company says it's ok to use the stock ones, you still will see mild valve float. Mild valve float is not catastrophic compared to severe valve float or coil binding.
But you know what valve float is right?
The spring has fatigued at high rpm and loses it's ability to control the rate at which the valve closes against the seat. The valveface slams shut against the seat and transfers this shock or load up the valve stem to the rocker arm and then to the camshaft lobe-rocker arm interface. You get extra wear-related damage and possibly structural fatigue at the valve seat, valveface, rocker arm lobe, valvespring retainer, and cam lobe. Valve float can be identified on a chassis dynosheet as a sudden very sharp or steep drop in hp (in the order of 5% [7-10 whp] or more) at the last 500-600 rpm before the redline.
hondar
your b16 valve spring wont do good. you need to upgrade it. A type r valve springs will do for Toda A, or if you are buying as a package, no harm getting one. And ensure that valvespring installed height is stock (1.320-1.325 in. or 33.53-33.66 mm)
all the best and keep us posted with any updates. cheers
Fit ITR valve springs to your intake valves & move your existing intake valve springs to your exhaust valves...
Your other option is to fit Toda springs...
Though some would tell you Spec A cams are a drop in...
Valve float will occur @ high rpm with standard valve springs fitted.
Just a though, if you do streach the budget for Toda springs,
You aught to use Spec B cams over the A's as you're doing the ECU...
This will offer you better bang for your bucks...
Trust me, the low-end torque gains will more than justify this desision.
Also, the actual cost of the pair of cams is the same... (A, B or C)
Cheers
Adrian
Also - Pm answered...
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