Small ports have a smaller internal area with comparison to the big port head.
Obvious yeah, I know, but as the area of flow increases, the velocity of the fluid in the area (port in this case) decreases, but as a side note, pressure in the port is increased.
Small port heads have a higher velocity of fluid flow in comparison to the big port head.
If someone can supply a nice clean bigport and small port head, I'll flow bench em.
Hachiroku since 1994
Originally Posted by LittleRedSpirit
i do but in briz
by the way
lol at white people in japan. just lol.
well a smallport has the best port velocity and also compression stock compare to a bigport also stock.
modify them both and still the smallport should have an advantage.
for a streetable engine i would always use a smallport.
my mr2 is a bigport and my trueno is a smallport and the 2 engines feel pretty different i think in terms of streetability and other factors.
toyota wouldnt switch to an inferior design
lol at white people in japan. just lol.
for forced induction 20v
+1
Hachiroku since 1994
hmm after this i now want ae111 quads + hks 264s... like the sound of 90 wheel kw
i had this setup in my car.. bigport 16v 264' cams with adj gears (so they say) Ae111 quads but it was running an SAFC from Japan and stock BIGport ECU.
all vacume lines fed into a small plenum then 2 feeds out of it.
it had no vacume lines hooked to the vacume sensor, it went to the charcol canister behind the front drivers headlight.
i hooked it up to the vacume sensor one day and the idle went all irratic so i just disconnected it and put it back how it was.
it always ran rich.. but now im putting the motor into a ke70.. i am debaiting weather to go the stock ECU now that i hear it can be ran on the ecu alone.. 90 rwkw sounds nice.
it would be alot cheaper to.
Frak was it just a matter of dialing in the cams?
i might throw it in in the next few days and see if putting a plastic fuel filter in the line for the vacume feed
Awesome stuff Frak, thanks.
What's the general procedure to dial in cams?
Do you just adjust one cam a degree or two at a time and check the dyno results until the power band is where you want it?
How do you go about dialing in stuff like overlap?
Posting Permissions
Reply With Quote
