HavATampa

iTrader: (49)

Was wondering is it the design of the cam lobes that makes the sewing machine sound or is it the springs or both? I hate this sound. I'm running a TSP 225 cam with Patriot Golds on stock heads and figured it was close to the TR design. Not sure what cam lobe profile TSP uses. Any decent size street cams on the market that are mechanically quiet?

chino_man279

iTrader: (7)

The very aggressive ramp rate of the cam, compared to stock lobes, causes the valves to slam shut. This is where most of the noise is coming from if I am not mistaken. You can find a cam with very mild lobes on it if it bothers you that much. I have grown to love the sound of the sewing machine personally.

TrendSetter

mistaken? are you ever. thats probably one of the stupidest things ive ever heard.

02WS6Bird

iTrader: (2)

How about some sleeper cams? SS1 SS2 or TSP Sleeper cam-all are good for the power and are mechanically quiet--id say dont go bigger ten the TR224

LSUxBlake

iTrader: (3)

My roomate is running the FM11 (228/230) w/ crane duals and it sounds stock under the hood. My FM11 is super loud because of the rest of my setup.

Cal

iTrader: (1)

I've had two cams in my car, the TR224 and TSP235/240, and both are quiet; both the same . Not stock, but not like a sewing machine. I'm not sure why some cars have a noisey valvetrain, unless they don't have enough preload on the lifters.

LS1_PNYTAMR

iTrader: (1)

i know tr or futral wont be two terrible bad.

HavATampa

iTrader: (49)

I was under the impression that the different profiles like XE, XE-R and TR would make a difference as far as the sewing machine effect, guess not. I used to not mind the sound when I was running a solid lifter cam in an old SBC, because that's the way it was supposed to sound with the clearances. But with hydraulic lifters, it just doesn't seem natural to me. What does it mean when jrp says the FMS cams use the Cam Motion lobe design? How is that design different than say TR's? What lobe design does TSP base their cams on?

gto69judge

iTrader: (32)

As you increase spring pressure past 100# on the seat, you will increase the "sewing machine" noise rapidly. High open valve pressure also increases noise due to it's ability to "bleed down" the lifter's plunger.

The new LS2 springs are 100# on the seat and around 300# at .560" lift. Coil bind occurs at 1.179"

The Comp cams #26915 springs are 105# on the seat and around 293# at .600" lift. Coil bind occurs at 1.085".

Either set will work for moderate cams and provide a low noise level. Use the 26915's for over .560" lift.

The 26918 springs will be noisy due to their higher seat and open pressure but should be utilized for operation above 7,000 rpm.

technical

Don't hold back...

Tranzor

I don't have as much of a sewing machine sound as some of the people I know with smaller cams... probably because the 231/237 is ground on a pretty tame profile (Lunati).

GuitsBoy

iTrader: (4)

I will assume that you are confusing the sewing machine sound being talked about here with the lope of a cam.

Lope is dictated loosely by lobe seperation and more accurately by calculated overlap.

The sewing machine noise discussed here is noise of the mechanical valvetrain components moving. They make more noise due to the faster ramp rates and increased lift, and a major portion of it is valve noise.

SStrokerAce

iTrader: (2)

The sewing machine sound I think he is talking about is valvetrain noise. Not lobe or exhaust noise. As HavATampa said it sounds like a soild lifter setup, and that's the best way to describe it to old school or engine guys.

Almost anytime you have this problem it is due to valvetrain dynamics. By that I mean how the relationship to the mass of the components of the system, spring pressure in the system and cam lobe profile all interact. When you hear this ticking or beating sound it's because that's what's acutally happening in the system the parts are being beat together and causing this noise.

With the specs on the TSP 225 you are looking at a good amount of lift on a 225 duration lobe for a LS1. Something similar to a comparable XE-R lobe. I haven't seen a breakdown of the rest of the measurements on the TSP lobes on this cam (and I don't really care too) but the little specs I have seen and the obvious noise that most users say they have with these cams gives me an idea. The aggressive ramps on these lobes (XE-R or these TSP lobes) cause more deflection in the valve train system and the only way to quiet them down is to use stiffer parts and more spring load, not less. Or the better solution is to use less aggressive cam lobes. That works on other motor designs extremely well and you'll also notice that cams from Futral use less aggressive lobes and end up being very quiet in the valvetrain noise area and having better control of the valvetrain with less spring loads.

TrendSetter, Chino was dead nuts on his statement. The valves are being slammed open and slammed shut. He actually has an idea what is going on.... I try not to say this but if you don't have a clue what's going on don't chastize anyone for saying something you obviously don't understand. That's like a nun chastizing a kid in high school that sex is bad, wtf do nuns know about sex anyways?

Bret
Bauer Racing Engines

GuitsBoy

iTrader: (4)

Plenty if they only went to the convent to have their bastard child anyway. Excuse me, the firey pits of hell are opening back up for me to return to my lair.

Thanks for busting on trendsetter specifically. I was going to, but its more fun to watch someone else do it

SStrokerAce

iTrader: (2)

It's ok I went to catholic school for years.... I feel ya

67Firebird455

iTrader: (27)

My 455 in my 67 bird has very aggressive lobes as it is a solid roller with .643/.660" lift and only 246/253 @ .050 on a 108. It idles like an angry skunk (lol) and runs awesome. I'm running husler series 1 7/8" out to 3.5" collectors, dropped to dual 3" with X pipe and dual 3 chambered flows for street use dumped and I can STILL hear the valve chatter, which primarily... in my case is coming from the rockers' .025" hot clearance.

GuitsBoy

iTrader: (4)

.025" lash? I dont know anything about solid cam setups, but it seems to me that this much play would quickly stretch valvestems and mushroom valveseats and other bad stuff that probably dosnt really happen anywhere other than in my head.

02Reaper

iTrader: (2)

Do you mind stating how? I have a futral cam in my truck. Here are the specs.
271* @ .006
221* @ .050
135* @ .200

221/221 .586 .586 112

Subtracting the .006 value from .050 is 50. An xer lobe is 49. A xe lobe is 53. Looks to be pretty much an xer lobe to me. I like my cam and yes it is noisy. But regardless of the grinder, whether it be cammotion, comp, crane, etc. There is no magic voodo to lobes. Either they are aggressive or not. Please explain.

Flareside

Look at how mild the .200" number is. I agree, that's a pretty mild lobe. It's much closer to my LPE grind (132 at .200) than an XER (they always measure 140+)

The Futral lobe, as well as the LPE, will spend much less time near peak lift, even though the peak lift is similar.

02Reaper

iTrader: (2)

Thank you.