cams, sohc vtec vs non vtec

[redefine]

i was just curious, is there any big difference between the cams in the sohc vtec and sohc non-vtec engines?

i know the vtec cams have -exhaust-intake-vtec-intake-exhaust- for the valves in one cylinder, but besides the lobe for vtec, is there much difference?

in other words, does the non-vtec cam go -exhaust-intake-space-intake-exhaust-, or is it completely different?

(this is all looking at one cylinder out of the 4 btw)

[trism]

i believe that yes,there is a space

[Limbo]

not much, the vtec sohc are abit more fuel efficient.
Performance wise bugger all

[redefine]

hmmm, i need to take the rocker cover off my ek methinks (its a non vtec sohc)
is there anything i need to keep in mind when doing it?

[beeza]

Yes yes!
I just changed the valve cover gasket and the spark plug hole gaskets (4 of them).$28 and $68 respectively.$68 is expensive but aye it's honda!
If you haven't changed the Valve cover gasket,I would do that but first check if the spark plug gaskets have splits in them and need replacing.If oil is getting into the spark plug holes and onto the leads and plug then there's a split in them.
More than likely they will be fine.It's only if you have taken the cover off before and wasn't careful with them when putting them back on.
Clean the surfaces well.Fit the new gasket.Use a gasket sealant like 'Ultra grey'.You only need to put it in the gasket groove at the camgear end.
Take care with the spark plug gaskets and make sure the valve cover bolts go in strait.Don't do what I did and strip some of the thread on the head.On 2 of them! Doh!...I went strait to Hondarec and got 2 sligtly longer bolts and it worked!
Torque the valve cover down in this order.First finger tight then tight/firm.

------------------------- *2 *3
------------------------ *4 *1 *5

[redefine]

thanks!

do the gaskets need replacing often? i dont know if mine have been changed in the 112000k's its done

[beeza]

The spark plug hole gaskets don't,the valve cover gasket only needs replacing if you take the head off a couple of times but I've taken mine off a few times and all is good.
Make sure you do it when the engine is dead cold too.
Your welcome

[nd55]

> i know the vtec cams have -exhaust-intake-vtec-intake-exhaust- for the valves in one cylinder,

The difference between the D16 vtec and non-vtec is much more pronounced in the US models.

Local versions (D16Y4,D16Y5 and D16Y8) all got good intake/exhaust manifolds so there's only about 8Kw difference.

The biggest difference is in the gearboxes. The Vtec D16's generally have slightly better gear ratios.

The D16Y8 is a traditional small cam/big cam style vtec mechanism. This engine is fairly rare locally cause it only came in US made coupes.

The D16Y5 is a i-vtec. This means there's only one cam profile.
ie: exhaust - intake - nothing - exhaust

the valve with the missing intake cam lobe does nothing up until about 3000rpm, when it locks to the other intake cam lobe and they move together.

Actually, this is a fairly oversimplified. The 'nothing' lobe is a very thin (width) very low lift lobe which exists purely to prevent fuel puddling behind that valve. Apart from opening the valve a crack it does nothing.

Nick.

PS> Get a Helms manual if you're going to be turning some serious spanner work. It's worth it's weight in gold.

[redefine]

thanks heaps! most of what i do to my ek, i wanna be diy, rather then bolt on (so i learn more about it), so i'm prob gonna be doing more and more spanner work as my budget grows (eventually)

and i have the d16y4, so i'm guessing it wont be much improvement.

a little OT, but what is the major design difference between the d series and the b series?

[Raztaz]

thanks heaps! most of what i do to my ek, i wanna be diy, rather then bolt on (so i learn more about it), so i'm prob gonna be doing more and more spanner work as my budget grows (eventually)

and i have the d16y4, so i'm guessing it wont be much improvement.

a little OT, but what is the major design difference between the d series and the b series?

well the B's are DOHC's, thers a big improvement on our single cam D series lol (we dont get DOHC D16A1 n 2 in Aus)

[redefine]

ahhk, other then that is there any major difference?

i'm guessing they'd generally be more robust/higher temp etc.

[trism]

there is ALOT of diffs between the d and b

they were designed for totally different purposes

the D was the engine for family cars, base models etc

the B was designed as a performance engine

go and do some research