88TransAmGuy

iTrader: (3)

Yes i know,THROW A CAM IN IT. But we did the motor swap and i cant quite remember but there was some reason why we couldnt put a cam in it. Something to do with because its a roller block.
Ive heard people get a specific muffler and lower their idle and it sounds cammed. But im not quite sure. Any ideas?

jmd

iTrader: (4)

swap a couple plug wires around and then put a cam in it.

if it's a 350 SBC, it could have had a cam put in it.

Andrew James

iTrader: (3)

Yeah, take off certain vacuum lines... Of course, motor might stall alot and not anything I would consider but hey, your car.

torque_is_good

your car wouldn't run if it didn't have a cam in it?

If you follow the exhaustive exhaust threads, and could get people to be honest, you'd find that the sound they seek is that of an engine with a performance camshaft but hope to get there with just a different exhaust.

As you have discovered, that isn't possible

so, you know your choices.

Oh, you misunderstood who sold the car to you or however the swap got in there. There are performance roller cams

AlkyIROC

Depends what kind out sound you're after.

I have Magnaflow race mufflers on my race car. With 582 CID and a cam with 0.800" lift, it idles smooth at 1200 rpm. It's loud with the mufflers but not as loud as open headers. At least with the mufflers, I can hear things in the car. Open headers and it has that high snap sound where I need to wear ear plugs.

On my 454SS pickup truck, I run dual Hooker Aerochamber mufflers and always get compliments on the deep rumble they produce. The 454 BBC engine helps. Camshaft is a basic computer friendly grind which is a bit better than the stock grind.

Mike92Firebird

iTrader: (3)

Haha. I was gunna say just pull a few plug wires all together.

A roller motor can be cam'd, just requires a differernt type of cam.

There's always differernt types of exhaust to be more deep sounding, but you'll never achieve the true cam'd sound without camming it. The only way a motor with a stock cam sounds cam'd is if it is misfiring.

skibum2100

You could adjust/rotate the TPS to something less than .54V, until you get a loping/uneven idle. This certainly won't help your car run well, but it will sound cammed.

Good luck.

MD83Z

We used to cruise through the local hamburger joints with the emergency brake on....makes the motor sound like it's working just to idle along....But that was early 70's...

rarebmx

iTrader: (6)

With all the effort to go through making the car sound like it has a loping cam you could just put in a cam. You can adjust timing - causes other isses; sluggish horrible gas mileage and can casue carbon build-up. Trying to make an engine sound like it is built with a radical cam never happens without some serious other issues coming up. Do your research, put in a Cam that performs and sounds cool.
There is a hell of a lot of effort figuring out how to make a car go. Think about it on an engine with all the ratios to make it go. Compression, lope of cam, lifter diameter, exhaust diameter, transmission gearing, rearend rations, tire and wheel size.... don't mess with somthing that isn't what it is meant to do without doing it "right"

Orr89RocZ

iTrader: (20)

play with the tune to lower idle speed and put a powerstick chambered tube exhaust on it. It will sound slightly cammed but definately not like a real cammed car.

tom3

Open up the EGR valve a bit. Might be getting pretty technical to do it though.

SiCkRs

iTrader: (6)

You could change the timing it will sound cammed but not run good my car was like that before. Or you could make a open cut out

grumpyvette

the RUMBLING EXHAUST and LOPEY idle is the result of high compression, high cylinder pressure and intake reversion pulses that screw up low rpm fuel/air ratios making the car idle like crap until intake air speeds get up enough inertia to make the car run correctly, the increased duration and compression ratio are designed to increase high rpm volumetric efficiency and boost hp, but the down side is that it tends to hurt low rpm idle characteristics
ok, Ill ask, why in hell would you want the car to idle like crap, and sound like a double AA fuel dragster when your engine is a total (POSSER) and can,t run worth crap,your obviously not going to be able to back it up with performance if challenged to a race what your basically trying to do is sound like you have a ton of hp, probably to impress the ***** crowd, why not actually build and install an engine that will at least allow long smokey burnouts in the parking lot.
look Ive built several hundred car engines over the last 42 years , and its just not that difficult or expensive to build a 375-420hp sbc, it doesn,t even need to sound like it rumbles at idle, but it can put your car in the low 13-mid 12 second range that makes your car faster than easily 80% of the street cars
yes I know all your friends claim to have 450-500hp cars, trust me a true 420 hp engine combo in a third gen camaro will eat most of those POSSERS for lunch

http://forum.grumpysperformance.com/....php?f=44&t=38

http://forum.grumpysperformance.com/...php?f=69&t=519

http://forum.grumpysperformance.com/...hp?f=52&t=5078

http://forum.grumpysperformance.com/...php?f=44&t=427

your effectively asking how

can sound like

while staying

redneckjoe

this is one of the oddest questions ive ever seen asked. Not even going there.

89RsPower!

A vaccum leak and a very low idle, but your car will run like crap. The first question that comes to mind is why would anybody want to do this? The lope you hear at idle from a "cammed" engine is do to valve overlap which is unavoidable with an aggressive cam, basically at low rpm's both valves are open at the same time which causes incomplete combustion which gives off that lovely smell we all love from the exhaust pipes. Basically you are trading a nice smooth idle for more power output (assuming your combo is properly selected) at higher rpm's. An engine with a factory or even a less aggressive aftermarket cam idle smooth do to their profile, a factory cam for example must have a reletively smooth idle due to emissions limitations, MPG's, cat converters (which will fill with unburnt/poorly burnt fuel and eventually melt/foul/get destroyed by an aggressive enough cam). Making your car run crappy to pretend you are running a larger cam would IMHO be a really silly thing to do and will most likely eat your cat(s) if you have any. If you want the sound at least do it the right way by selecting a good aftermarket grind that will suit your combo/goals for your car. If you are running a carb'd combo it's fairly simple to accomplish assuming emissions are not a concern. EFI engines require a bit more work to get running properly with a large cam since they will require chip tuning, AFPR, possibly different/larger injectors, etc depending on your combo and will require a cam specifically suited for use what ever fi system you will be using.

xch3no2

lol thanks grump, I wouldn't have wasted that much effort.

OP it's all true, why do you want your car to run like crap?
We don't want our racecars to run like crap at idle, it's just unavoidable at a point. By the way race engines are weak as a kitten at idle...running like crap.

TreeFiddy

Easy and cheap solution to this vexing problem - just mp3 a race motor and crank it thru your subs. Bounce up & down a little to complete the effect.

Orr89RocZ

iTrader: (20)

I dont understand the problem here. Just because a motor lopes at idle doesnt mean its running like crap. You can have a big cammed car and still idle just fine,, even tho is lopey. My 383 had a big cam in it and idled just fine at 900 rpm but was very mean sounding with alot of overlap and lope.

I understand the poser thing but you can acheive some tiny lope sound with the right muffler and tuning/idle speed. Still will run ok when done right. I heard a 305 car that was tuned to a lower idle speed and it sounded like it had a mild cam but idled just fine. It was stable