I was only looking at the top end effects.

If you are trying to improve the off VTEC performance maybe a different diff ratio or a 2.2 litre would be your best route.

 

I'm wondering if I should atempt to install the gasket myself?
I should take it to a shop but at around $700 labour its gonna workout expensive for a few HP's

 

You are going to get more power from running race fuel on your track days. I use Elf LMS when I track my F20C powered race car and its good for an extra 500rpm down the main straight. I was surprised.
$700 buys a lot of race fuel.

 

thats good to know I was gonna do that too

how do you get the tank empty enough of regular to put the racegas in or did you tune on a small mix?

 

I redirect the outlet of the fuel pressure regulator to an jerry can and idle the car till it runs out of fuel and stops.

 

Back from the dead!

Is there any sure way aside from claying the engine to find out PTV clearances when running the Supertech flat standard size valves along with the Spoon head gasket? Also, will be using the Brian Crower stage 2 cams, which have higher lift, so this will also come into play. I'm also looking to increase the valve overlap slightly by advancing the intake cam and retarding the exhaust with a set of offset woodruff keys.

I just need to figure out if all these things will work together and still maintain adequate clearances.


Any insight?

Thanks,
Tyler

 

the only way to determine the adequate clearances is to degree the cams.

 

I ran spoon ugh for 3 years cAr dyno at 208 with only 70m exhaust stock intake box

 

There are many ways to check clearance. Dialling in the cams only sets the phasing and doesnt itself check clearance.

Some people use plasticine or clay. While this method works it is still possible to have valve to piston contact while you are turning over the motor to imprint the clay. Also, each time you change the cam phasing you need to take the cams/rocker assembly, timing chain and head off the motor and replace the clay.

A better way is to use checker springs. I have pictures of this on my F24 build thread. https://www.s2ki.com/s2000/topic/692...er-f24c-build/

With this method, assembly only 1 cylinder using lightweight hardware store springs. If your camshaft phasing is completely unknown (eg, adjustable cam pulleys initial install) you can assemble without a piston/rod and adjust the cam phasing and check valve/valve clearance.

The springs allow you to slowly turn the motor a full firing cycle paying attention to near TDC on the exhaust/inlet overlap. You can move the motor a little bit and then push gently down on the retainers to feel how much clearance there is. You can also push both sides to get a feel for the valve to valve clearance. The beauty of the testing springs is you can make changes to the cam pulleys and recheck clearance without having to pull the head and replace clay.

On a vtec motor I use small button shims behind the vtec pins ( like tic-tacs) so that the rockers are stuck in the high cam position.

Stock pistons do not have as generous valve pockets as some aftermarket pistons. Its worth asking the cam supplier if their camshafts will work with standard pistons.

Ideally you want at least 1-1.5mm ( 0.040 to 0.060) clearance as a minimum. More on the exhaust is good as this is the valve that will be left hanging in the air during a mechanical over rev.