Roller Camshafts for the 4.0

[kremlin]

http://autos.groups.yahoo.com/group/strokers/


We're arranging for Roller Camshafts for the 4.0.

Not cheap.

Anyone interested - log on.

 

[jeepinwi]

I hate how yahoo lists their threads. How much is it going to cost?

 

[kremlin]

At this time I've a Pro Custom Cam Business that is creating the rough cores looking at the stock cams - then CRANE will receive them - turn them into finished product according to each orders specs for a tentative $500.00 - custom cam pricing.

CRANE AMC hydraulic roller lifters with a special attachment bar from one of the Strokers List members will be available.

Things like performance springs / locks / keepers is per usual.

 

[old_man]

Stupid question....................how are you going to keep the lifters aligned?

 

[Flash]

Stupid question....................how are you going to keep the lifters aligned?

As kremlin said above, its a AMC V8 Hyd Roller Lifters, that have been modified to fit the 4.0L. There is NO modification to the block at all, to fit, and make this modified lifter work!!!!

The cam is being made so that it will fit all, AMC l6 cylinder Eng's.

This project has been going on for a long time. We are past the if only and how could we make it work...........

The AMC ROLLER CAM WILL be made and WILL be $$$$.

Flash

 

[BBeach]

I dont know much about cams yet so someone school me. What are the advantages of this one vs. a stock one? Any power gains, changes in valvetrain?

 

[MudDawg]

For one thing, if everything is properly designed and set up, a roller would be immune to the lifter/cam lobe failures so often associated with flat tappet cams in the I-6....the reduced friction will free up some hp....and the lobe profile can be more agressive....and it will make breaking in a new motor far easier since you won't need the obilgatory 30 minutes at 2500 rpm to assure the lobes won't wipe.....besides that it would be cool:greensmok

 

[TiRod]

Of course, its all in the timing, lobe separation, overlap, and where the torque curve is being positioned. Details?

 

[IslanderXJ]

I don't see why they wouldn't but... do they work with roller rockers? Most of this is still black magic and pixie dust to me...

 

[Flash]

I don't see why they wouldn't but... do they work with roller rockers? Most of this is still black magic and pixie dust to me...

OK guys,
Short answer........The "Hyd Roller Cam" will give you more torque and Hp for the same spec., flat tappet cam. it is not affected by the new oils that are causing are HP Flat tappet cams to fail early in life......and Yes Roller Rockers will work the same with a Flat Tappet cam or Roller Cam..

I fill i now a lot about cam shafts, but in comparison, of some one that nows every thing about cam shafts.....I would probably be in the 10% category on knowledge.

With that said, this is what i think.

The quicker that you can get the valve open, the longer it's at full lift, and then the quicker you can get it close, will give you the most all around power.....wether the cam is designed to run 8,000 rpm or is a low end torque cam.
A Flat Tappet cam (4.0L cams) can only raise the lifter so fast, and close so fast due the the edge of the lifter gouging into the cam if the cam ramp is to steep.
With a ROLLER CAM the Roller Wheel can run up a much steeper ramp then a flat tappet can.

OK now, when a valve starts to open, there is no flow and flow doesn't really get going until about .050" of and inch of lift.

Now a big Flat Tappet cam would have a lot of Duration and "overlap' (a short time, when both the int. and ext. valve are open.) the more overlap you have the more top end HP and the higher the torque curve is raise......Meaning,... bottom end Torque is sacrifice for more top en HP

Now if you could wait to open the int. valve, just a few degrees later and then open it up faster then the Flat tappet could................

Let me put it a different way. a good low end torque cam would be in the
250* to 260* of duration cam (this would be a "seat to seat" spec, not a "at .050" spec.)
You would have lots of bottom end torque at the sacrifice of HP at the higher rpm range.
On the other end of the scale, a cam with a lot of duration 280* 290*(and more overlap to boot) of duration would make really good high rpm HP but would lose most of the bottom end torque of the previews cam.....the torque curve would move up the rpm scale too.

OK stay with me here.

Now with a roller cam, you can have 250* of duration cam, that will act like a 290* cam with out sacrificing low end torque....Why?????
When the cam(or valve) starts out to lift the valve, it lift the valve off of its seat late, But pop up to full lift sooner and stays there long, but still closes sooner.(250*.....'time in degree, of the eng, that the valve is open') when you have the valve fully open, is when you will get the most volume of air and fuel in to the syllinder..........the roller 250* cam is at max lift longer (allowing more air in) then the Flat tappet cam. both cams are lifted off of there seats for the same amount of time.... but, the Roller cam gets more air in. and sense the 250* cam has less overlap then the 290 would, there is more bottom end then the 290* cam would have.

Hyd Roller cams have been in modern eng for many a years now...Why?
Because you can make more HP with them with out failing at the emissions station.
These numbers may not be completely accurate but, you get the point!!!

Flash

 

[IslanderXJ]

Thank You Sir! I think I got the black magic stuff out of the way... now for that freaking pixie dust... that stuff is everywhere!

 

[Flash]

Thank You Sir! I think I got the black magic stuff out of the way... now for that freaking pixie dust... that stuff is everywhere!

The Pixie dust, is what allows you to blow the, doors off from the car next to you.assgas: :shhh:

Flash.

 

[old_man]

My question is how are you going to keep the roller lifters from rotating. Every engine I have built with roller lifters had a plate to index the lifters in the oil galley. How will this be done on a 4.0L?

 

[MudDawg]

The roller is a complete KILLER idea....but you also need to remember (or learn in the event you don't know)....you will not be able to spin the engine above 5300 rpm or so even with the roller because of the cam harmonic that will snap the cam chain.....unless someone will build a gear drive.....Hesco used to sell a gear drive, but no longer do. So a gear drive would be another great thing to revive.

 

[Flash]

My question is how are you going to keep the roller lifters from rotating. Every engine I have built with roller lifters had a plate to index the lifters in the oil galley. How will this be done on a 4.0L?

There is a bar that ties them together.

lifters go in first and then the the bar is attached to the 2 pared lifter after words. Its a little bit difficult to do but i works.


Flash.

 

[chrslefty]

just great now my imaginary engine is going to cost even more!!

on a serious note tough:

will this work with hescos AL head ?

how well will this work with forced induction ?

 

[Flash]

just great now my imaginary engine is going to cost even more!!

on a serious note tough:

will this work with hescos AL head ?

how well will this work with forced induction ?

The Roller Cam will work better,.... not only because the Roller cam is allowing it to breath better, because you will be be getting a cam profile that fit "YOUR" application,(Blower, turbo charged, Hi compression,low compression Ported head, Alu Hesco.....EXC.) not a cam off the shelf that was designed to fit a broader application

Between you and your cam grinder, you will be building a cam that fits you application.


Flash

 

[gptrilik]

Looking forward to this happening!!

George T.

 

[MrShoeBoy]

If this came from or goes through Crane I REFUSE to buy it. That company has fucked me well enough over and I will not buy any of their products because of past products failing and they not helping to fix their mistake.

If somebody else made the cam, I would be very interested

AARON

 

[corbinafly]

If this came from or goes through Crane I REFUSE to buy it. That company has fucked me well enough over and I will not buy any of their products because of past products failing and they not helping to fix their mistake.

If somebody else made the cam, I would be very interested

AARON

So did you have one of their cams fail on you because of lack of ZDDP in the oil you were running or was it something else? They're not the only ones with cams that have flattened due to the newer oils.

Kyung