[Dansby]

Effect gas milege? Just out of curiousity of course. Having a more aggressive cam with a longer loop. Answers?

[Avaric3]

yes it will, itll drop slightly

[Dansby]

But not terribly? I've tried understanding cams, but no the easist thing in the world, haha.

[Avaric3]

no not terribly, maybe 1-2 mpg at worst

[itschristorres8]

lol at worst yeah right. at least.

with a cam your allowing more air in your cylinder and in the combustion chambers you'll need more fuel to match that

i lost about 5mpg with the ported intakes and heads and my cam. my cam does have a high lift though fora stock motor.
a cam alone expect abotu 2-3mpg decrease
and you'll need a tune

[Dansby]

Thanks man.

Chris, could you explain, in lameins terms, cams to me?

[itschristorres8]

lol kk
a cam has lobes. thats those things that are odly shaped in the middle
they're like a circle til the lift point comes where it turns into an oval kinda. when its riding normal on the circular part the valves in your cylinder head are closed
so no air is leaving or getting out at that point
a push rod rides on the cam lobes(for our motors)
that push rod goes from the cam through the head to the rocker arm which the rocker arm is connected to the push rod then the other side the valve stem. when the push rod moves up the valve moves down

the push rod will only move up when the cam lob lift comes in. thats the high part in the lobe.
stock its usually a small lift.

now raising the lift of it and increasing the duration of how long the lift is will let that valve stay open longer
which lets more air in and more air out faster
more air=more power with more fuel

[6ER THEN I 8ER!]

so whats the average hp and tq gain from a good cam?

[itschristorres8]

Originally Posted by 6er_w/a_Vengance so whats the average hp and tq gain from a good cam?

n/a on a stock motor about about 15-25rwhp
25 would be quite arrgessive for just a cam no top end work. and probably not doable with out top end work
on boosted applications gains for 30+rwhp

i wish my buddy Ron(96bboy) would get one
it actually can let you get more power a litter safer with boosted cars.
plus he has ported heads and intakes


example
a guy with a procharger ported intakes and a cam made 374rwhp on 11psi with his v6 stock bottom. stock heads i believe
that car with out a cam would have made maybe 330rwhp and thats being nice.
also a perfect cam for f/i motors seeing 40rwhp is not a huge ordeal

if i didnt port my heads i'd probably have more torque but slightly less rwhp
if you look at my graphs my car at 5000-6000rpms just wants to gain more and more rwhp.

[Dansby]

So, new cam with no tune would=running lean, because more air with the same amount of fuel being let in? Or would it adjust itself accordingly?

[itschristorres8]

it would try because the 02 sensors would read a lean condition

[Dansby]

Would those be the 02 sensors in the exhaust? Because I'm running an o/r x and the guy plugged/welded the holes where the sensors were supposed to go and drilled holes closer so he could plug the original sensors in. Ever since then, the check engine light has been on.

[Blainestang]

FWIW,

I have the following:

CAI
Take-off duals
Ported Heads
Custom Cam
Dynotune from Justin @ VMP

The car got ~30mpg on a recent trip to Jacksonville and back, and I routinely get 25mpg commuting to work and back.

I honestly didn't see any notable decrease in gas mileage before and after my heads/cam.

[Dansby]

What kind of gains did you see from that work?

[Blainestang]

Originally Posted by jdansby1 What kind of gains did you see from that work?

With just the CAI and take-offs, it made ~170whp. After the Heads/Cam/Tune, it made ~220whp.

[Dansby]

Nice man. Now, would be correct in assuming that you would need to go with a low compression cam if you wanted to go f/i later?

[Blainestang]

Originally Posted by jdansby1 Nice man. Now, would be correct in assuming that you would need to go with a low compression cam if you wanted to go f/i later?

Well, the cam doesn't really change the compression ratio, but yeah, if you were planning to go F/I in the future and want a cam spec'd specifically for that, you'll have to give up some N/A power.

[Dansby]

How do you go about making alot of naturally aspirated power?

[Blainestang]

Originally Posted by jdansby1 How do you go about making alot of naturally aspirated power?

Are you talking in general? Or cam sizing? Or...?

[Dansby]

Well...what is the process/set up to make a high powered n/a v6 that you could later at nitrous to.