captdownshift

i'm surprised by the complete lack of cams available for the 1.5l, with all the echo, xa and xb's out there on the road there has to be a market for it, and the delivery of the engine would lend itself to a moderately agressive cam quite nicely, say a 268
also it could control the vvt-i and make it more pronoucned at higher revs

will any manufacturer ever come up to bat?

badger2

what is a cam, exactly?

captdownshift

camshaft, they control the valve lift, and duration (opening and closing in terms of how much they open and for how long)

Mosh_xB

i hope someone makes on eventually

i love the sound of cams

my 66 mustang coupe is cammed

proctorsilex

I think that i read a rumor about ZPI considering cam work, but I mainly read rumors about them. Nothing bad about them that I know of, so maybe they will be.

I guess they could make the cams more agressive, but I don't know how aggressively they're angled already.
There's not a big market for this engine though, especially considering that this is a smaller engine that Toyota rebuilt and tweaked the hell out of for economy.

Keep us posted if you find anything.

dexter_5000

its a vvt-i engine the ecm controls the intake cams duration by adjusting it with oil pressure in a chamber on the end of the cam. you also have to remember that this was designed as an econo engine not a high out race engine. like the g series heads on other engines toyota has produced.

proctorsilex

First paragraph: http://en.wikipedia.org/wiki/VVT-i
http://www.echodrivers.com/forums/viewtopic.php?t=503
http://www.autozine.org/technical_sc...gine/vvt_1.htm
http://www.echodrivers.com/forums/viewtopic.php?t=5560

VVT-i is only about the timing of the intake valves in relation to the exhaust.
We would still need more agressive cam angles to get the valves open sooner. Maybe increasing duration would help too.

My understanding is that at higher engine speeds, the flow of the intake is not able to get enough into the cylinder. Opening the intake a little earlier while the exhaust is stil open lets the intake stroke take advantage of the exhaust gas flow. However, at low speeds the overlap is far from ideal so a compromise of overlap is chosen in engines without variable valve technology.

If anyone is going to get us cams or at least experiment to see if they help, it will probably be ZPI. I have not heard of anyone else who has even claimed to think about more internal engine work.
So get on their forum or email and bug them! Don't be rude, but make some helpful suggestions.
http://www.zeropointindustries.net/forum/