cam question

[GSXRTURBO1]

On a gas engine, especially a 2 valver with overlap, a healthy cam has a unique unmistakable sound at idle speeds. It seems that gasoline 4 valvers with larger camshafts don't quite sound the same, although they too have a very unique sound at idle when enough lift/duration is being used with the cam choice, just not as radical as pushrod 2 valvers.

My question is this: do diesels react to camshafts the same way? For example, does a diesel cam with considerably more lift/duration then stock sound much different at idle? Does it sound different at all? If so, in what way?

Always learning.

Thomas

 

[PACougar]

Yes, they do sound quite different.

 

[ScreaminDuramax]

I didn't feel or hear any difference, other then power curve

 

[GSXRTURBO1]

Yes, they do sound quite different.

Makes sense.... thanks!

 

[PACougar]

I didn't feel or hear any difference, other then power curve

How aggressive is your cam? I know trucks with larger cams can develop a bit of lope. The cam in me ext cab is only a 3388 and even the guy that replaced my windshield noticed the difference.

 

[ScreaminDuramax]

6480. Not to radical. But def different

 

[PACougar]

6480. Not to radical. But def different

I've never heard a truck with that cam, I split the difference and my other truck has a 9100.

 

[ScreaminDuramax]

I've never heard a truck with that cam, I split the difference and my other truck has a 9100.

:thumb::thumb:

 

[Cknight199]

I have an aggressive wagler cam and noticed a different idle sound. I have heard of using an adjustable timing gear will really make a truck have a lope at idle.


Sent from my iPhone using Tapatalk

 

[DMAXchris]

The idle changed on my truc kwith a big Hamilton cam. Not lopey like a gasser, but its more pronounced and deep. Kinda sounds like a Cummins or piece of equiptment.

 

[GSXRTURBO1]

Thanks everyone, some great info, been wondering about this for awhile now :up::thumb:

 

[Cknight199]

Double post

 

[Yellow Jacket]

I run a pretty aggressive can, near .600 lift and a good amount of overlap for a diesel...it is installed with an adjustable can gear, sounds different, yes....but no lope whatsoever. There is no throttle body or intake vacuum, so the lope is not coming from a can, lol...

 

[GSXRTURBO1]

I run a pretty aggressive can, near .600 lift and a good amount of overlap for a diesel...it is installed with an adjustable can gear, sounds different, yes....but no lope whatsoever. There is no throttle body or intake vacuum, so the lope is not coming from a can, lol...

good point.... how much of that unique sound from a long duration/high lift cam in a gasoline engine is attributed to intake vacuum variances? (I would think it's actually very little, and most of it comes from exhaust pulses/waves due to reversion, etc.) Is that same unique sound missing from a diesel because of no intake vacuum? Perhaps differences in i/e overlap between a gasoline 2 valve per cyl v.s. a diesel 4 valve per cyl??

Lots to think about :thumb: