Camshaft choosing "how to"

[rottenronnie]

Honestly Pokey, lets not get that technical yet




i think ronnie is frozen


Why do you want less overlap for a supercharged engine?

"Oh, Oh... I KNOW, I KNOW" !!!

"Because, during overlap (when both the intake and exhaust valves are open), blower pressure goes right out the exhaust port at low(er) engine speeds. This condition is made worse with more overlap (and more duration).




(Did I pass?).....

 

[JTS VENOM PERFORMANCE]

Oh I KNOW I KNOW !!!

:dontknow: :dontknow: :dontknow: :dontknow:

 

[rottenronnie]

the intention of the thread is to give the guys some knowledge of picking and choosing a cam.

the paxton, or Roe, deserves its own special cam.

hence so does a naturally aspirated motor, as well as a turbo.

if these guys can start understanding the different profiles and specifications of a cam, then the numbers will start to make sense.

and then they can understand "why" one cam , or one set up , actually works better than another.

a cam head configuration depends on alot of variables, but, also most are at a certain level.

such as a paxton, keeping the overlap 'tight" helps with the boost configuration.

Ok, misunderstood the intent....I think I've got it now...:marchmellow:

 

[JTS VENOM PERFORMANCE]

"Oh, Oh... I KNOW I KNOW" !!!

"Because, during overlap (when both the intake and exhaust valves are open), blower pressure goes right out the exhaust port at low(er) engine speeds. This condition is made worse with more overlap (and more duration).




(Did I pass?).....

:rock: :rock: :rock: :rock: :rock: :rock: :rock: :rock: :rock:

 

[JTS VENOM PERFORMANCE]

question nubmer two


if you were doing a NOS camshaft on a naturally asperated motor(engine for the guy that busted my balls about that!LOLLOL)

do you really need a camshaft designed especially for NOS

if the engine stays mostly stock compression, and maybe with a littel port cleaning?

if so , why?

 

[rottenronnie]

question nubmer two


if you were doing a NOS camshaft on a naturally asperated motor(engine for the guy that busted my balls about that!LOLLOL)

do you really need a camshaft designed especially for NOS

if the engine stays mostly stock compression, and maybe with a littel port cleaning?

if so , why?

Sorry, I was out shoveling snow...F*ck a duck! It's cold here...

For a race only engine to be competitive with nitrous- Yes, I would do this...(but it also depends on how big a hit, among other things)...
1. Keep intake velocity high ("smaller" events, not much different than a stocker).
2. Help exhaust flow (through split cam timing with more Exh. duration,). Improve exhaust port flow; i.o.w. do what you can to assist blowdown (early valve opening will help) .

For an engine that uses nitrous occasionally- NO, I wouldn't bother changing it. What really, does it mean to HAVE TO change the cam because of nitrous??
Or HAVE TO use headers with these trucks

Stink- Did you doze off ??... Hello ...

OK, Someone else's turn....

Rotten

 

[pokeytemplar]

Well dang it the only question that I knew the answer to rotten got it! Have any of the Roe guys thought about trying out the Miller cycle? Since they have the boost down low they could increase the duration of the intake valve after BDC.

 

[rottenronnie]

Well dang it the only question that I knew the answer to rotten got it! Have any of the Roe guys thought about trying out the Miller cycle? Since they have the boost down low they could increase the duration of the intake valve after BDC.

pokeyT-

A project was in the works, using a custom roller (among other things), in a build for yellow venom as he is going Roe.
I wanted to kill some cylinder pressure down low, in an attempt to carry the engine through the detonation-danger area when it is under massive grunt (low vehicle speed at wide open throttle); esp, with the automatic trans and even more weight, in the Quad Cabs.

In my humble opinion, I still think the original roes hit too hard, too soon, in the heavy trucks.

Unfortunately, the project had to be shelved.

 

[pokeytemplar]

pokeyT-

A project was in the works, using a custom roller (among other things), with yellow venom as he is going Roe.
I wanted to kill some cylinder pressure down low, in an attempt to carry the engine through the detonation-danger area when it is under massive grunt (low vehicle speed at wide open throttle); esp, with the automatic trans in the Quad Cabs.

In my humble opinion, I still think the original roes hit too hard, too soon, in the heavy trucks.

Unfortunately, the project had to be shelved.

That would have been a very interesting build. I guess these new Whipple/Roe units will only make the problem worse. So, you would like to see that bypass valve actuate progressively to reduce the "hit" instead of the current on/off configuration?

 

[rottenronnie]

That would have been a very interesting build. I guess these new Whipple/Roe units will only make the problem worse. So, you would like to see that bypass valve actuate progressively to reduce the "hit" instead of the current on/off configuration?

PM sent...

 

[JTS VENOM PERFORMANCE]

Ok we are getting alot of views and no-one posting but a couple fellas.

Where are the questions?

so I am guessing everyone understands how and why a cam works?

or does everyone jsut think buy a 708 mopar cam and it works on everything

 

[rottenronnie]

question nubmer two


if you were doing a NOS camshaft on a naturally asperated motor(engine for the guy that busted my balls about that!LOLLOL)

do you really need a camshaft designed especially for NOS

if the engine stays mostly stock compression, and maybe with a littel port cleaning?

if so , why?

What are your thoughts on this one?

 

[pokeytemplar]

well since the trucks are so heavy and they don't like being reved high. What cam specs would provide the most power in the 2-5k range? More TQ down low to get these heavy trucks off the line but less up top to keep us out of the "go boom" RPMs. This would be leaned more toward the everday NA driver looking for that extra kick.

 

[pokeytemplar]

Another thing that would be cool would be a lesson in matching the cam to the heads flow sheets. Maybe some theoretical flow sheets and the cams that would match.

 

[Bone]

Ok we are getting alot of views and no-one posting but a couple fellas.

Where are the questions?

so I am guessing everyone understands how and why a cam works?

or does everyone jsut think buy a 708 mopar cam and it works on everything

Group buy???

 

[JTS VENOM PERFORMANCE]

Group buy???

on what?? we are talking about cam designs, and specs:dontknow:

 

[pokeytemplar]

:questionmark:No one will answer my questions:questionmark: :bawling: :bawling:

 

[JTS VENOM PERFORMANCE]

well since the trucks are so heavy and they don't like being reved high. What cam specs would provide the most power in the 2-5k range? More TQ down low to get these heavy trucks off the line but less up top to keep us out of the "go boom" RPMs. This would be leaned more toward the everday NA driver looking for that extra kick.

so what kind of cam will give you more power down low?

and what causes it to give you more power on the low side and how do you acheive that?

 

[JTS VENOM PERFORMANCE]

Another thing that would be cool would be a lesson in matching the cam to the heads flow sheets. Maybe some theoretical flow sheets and the cams that would match.

heads flow 300cfm.........what now?

 

[ViperJeff]

Ok we are getting alot of views and no-one posting but a couple fellas.

Where are the questions?

so I am guessing everyone understands how and why a cam works?

or does everyone jsut think buy a 708 mopar cam and it works on everything

Tony, thats because some of us guys don't know crap are reading and learning

Jeff