The B20VTEC discussion thread

You should really round off the egdes on the pistons, those sharp edges promote detonation

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Originally Posted by ZeForce

You should really round off the egdes on the pistons, those sharp edges promote detonation

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id say this was a work in progress pic and not the final product.

But , a good heads up for all those learning !

Quote:

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Originally Posted by ZeForce

You should really round off the egdes on the pistons, those sharp edges promote detonation

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yes, you really should (remember to take pictures after you finish rounding off the edges!)

actually , post #281 has finished pics :)

:thumbsup::thumbsup::thumbsup:

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Originally Posted by tinkerbell

oh, and see how the P3F is has a pronounced dish and the PHK is more flat?

that is the difference between the B20B3 and the B20B8 :)

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So the P3F is the one with 8.8 compression?

yeah that's right.

btw, how did you know how deep to go with the dremel? and what head/grinding bit did u use with it?

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Originally Posted by kraiye

btw, how did you know how deep to go with the dremel?

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A standard B20 intake valve has a head diameter of 31mm
But the B16A/B18C intake valve is 2mm bigger at 33mm.
So, the intake flycut radius aught to be increased by 1mm.

I wouldn't recommend going much deeper...

For interest sake, nothing need be done on the exhaust side as the standard exhaust valve sizes are the same for B16A/B18C/B20B @ 28mm (dia)

yeah, so you don't just make them deeper as such, you take them wider (1mm) and correspondingly deeper...

great info thanks.

don't suppose you know what's required for skunk2 pro1 cams in a b16with stock valves? would that require going too deep adrian?

wat?

you wann run SK2 Pro cam's with stock B20B pistons?

i doubt that 'combination' will be any good...