Anyone Remember Revolver Cams?

[S4James]

http://s4wiki.com/wiki/Cams

I still have my 001 grind set of them.. And I'm considering running them on my rs6-k24 build.

I ran them for a summer on my k04 car and quite liked them. I figure these will help with spool etc.


Stock heads, block, with rods.


As I recall, they spooled the k04s about 500rpm sooner, and you could build 10psi of boost just reving it in neutral. They drove very nice. Due to a series of clusterfucks, they came out for really no good reason, and never went back in. Been sitting on them ever since.

Definitely some idle misfires that can be handled by tweaking the idle speed and torque offset. I figure a custom tune can tweak the thresholds for throwing codes as well.



Any old fogeys left that could give me some insight, shout at me not to use them, or otherwise wish me well?


I don't believe these ever got a fair shake, they needed a bigger turbo than k04s to really shine, and the company folded up before there were ever enough big turbo cars to try them with.

[Mark00s4]

i would be very interested in results on a big turbo car. there's got to be better choices than a NA 2.8 cam designed for 200 hp.

[S4James]

I wont be in a position for a before/after unfortunately.....

There are similar spec CAT and Piper cams out there but I never hear of people using them.

[Blake2423]

It seems almost no one makes cams for these cars now. Cat still does but only one of there grinds is available and I think its the first one. The revolvers and pipers have some sick specs!

[rnagy86]

I have 3 sets of cams:

- Loba hydraulic
- Loba mechanical
- Catcams 1004052

I am going to test the cat one in a matter of days.

[Mikse]

I have 3 sets of cams:

- Loba hydraulic
- Loba mechanical
- Catcams 1004052

I am going to test the cat one in a matter of days.

Hopefully you'll test them before and after proper degreeing. Wont see gains in stock position just losses in mid range.

[rnagy86]

Hopefully you'll test them before and after proper degreeing. Wont see gains in stock position just losses in mid range.

First i am not going to degree them, and see what the results are, then go from there. Don't forget that we can also
play with cam changeover before degreeing them.

[S4James]

Hopefully you'll test them before and after proper degreeing. Wont see gains in stock position just losses in mid range.

Oh? I don't think you can "degree" stock cams any more than you can revolvers... they are just reground stock cams after all...

Those cam gears don't look like they are adjustable. Am I wrong?

[replica_rs4]

Oh? I don't think you can "degree" stock cams any more than you can revolvers... they are just reground stock cams after all...

Those cam gears don't look like they are adjustable. Am I wrong?

Cat cams are the adjustable set. On intake side . it would be great to know where the sweet spot is. 034 recommends 112 intake center line max. I guess every set up would be different , but still some info is better then none.

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[Bordom]

Oh? I don't think you can "degree" stock cams any more than you can revolvers... they are just reground stock cams after all...

Those cam gears don't look like they are adjustable. Am I wrong?

They're reground stock cams? Care to share where you found this information?

I plan to regrind a set of 2.8 cams for a little more aggressive profile

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[Mark00s4]

does anyone have specs for loba hydraulic camshaft?

[replica_rs4]

does anyone have specs for loba hydraulic camshaft?

http://audisrs.com/archive/loba-spor...__t_19411.html

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[S4James]

They're reground stock cams? Care to share where you found this information?

I plan to regrind a set of 2.8 cams for a little more aggressive profile

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Well I got these things nearly ten years ago when they were being first made. I know they are regrinds because Jason told me so. Also you put little caps under the lifters to make up for the reduction in base circle size.

[Mark00s4]

http://audisrs.com/archive/loba-spor...__t_19411.html

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thanks !

[Bordom]

Well I got these things nearly ten years ago when they were being first made. I know they are regrinds because Jason told me so. Also you put little caps under the lifters to make up for the reduction in base circle size.

I'd like to know more about these caps; where can they be found?

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[S4James]

I'd like to know more about these caps; where can they be found?

Everything graciously mispelled by Android

nope came with the cams. im lucky none were lost too.

[rnagy86]

These caps are regular lash caps that you put on the valve's end. When a camshafts gets reground, the base circle
gets smaller. Depending on the amount they remove, you either need lash caps to bring the lifters up or in case the
amount of removed material is small enough, the hydraulic lifters can just adjust, to take up the bigger clearance.
As far as I remember a 20-25% smaller base circle is fine and won't need a lash cap, but don't quote me on that.

[S4James]

These caps are regular lash caps that you put on the valve's end. When a camshafts gets reground, the base circle
gets smaller. Depending on the amount they remove, you either need lash caps to bring the lifters up or in case the
amount of removed material is small enough, the hydraulic lifters can just adjust, to take up the bigger clearance.
As far as I remember a 20-25% smaller base circle is fine and won't need a lash cap, but don't quote me on that.

Yes thats correct. As for not needing the caps... I have heard the same, but since I have them, I may as well put them in.

[replica_rs4]

I have 3 sets of cams:

- Loba hydraulic
- Loba mechanical
- Catcams 1004052

I am going to test the cat one in a matter of days.

Did you ever get around to testing out catcams 1004052?

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[MacDaddy]

You could get your stock cams reground as well, delta cams in washington does it all the time, very knowledgable too if you wanted to talk about what you want out of the regrind, etc.

http://deltacam.com

[S4James]

I actually decided to forgo installing these things. Anyone want a set?

[sherbet]

Close friend of mine is running the (1004052) grind from CAT cams- a new grind they offer. The car is a 3L with built heads, RS4 intake, big exhaust manifolds, and TTE780 turbos. So far so good on the break in- full power runs should be coming soon and by the looks of the break in chart, they are going to yield some awesome results.

[replica_rs4]

Close friend of mine is running the (1004052) grind from CAT cams- a new grind they offer. The car is a 3L with built heads, RS4 intake, big exhaust manifolds, and TTE780 turbos. So far so good on the break in- full power runs should be coming soon and by the looks of the break in chart, they are going to yield some awesome results.

Could you find out what intake lobe centerline it was set at ? And lift @tdc for that centerline
Thanx

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[NOTORIOUS VR]

Close friend of mine is running the (1004052) grind from CAT cams- a new grind they offer. The car is a 3L with built heads, RS4 intake, big exhaust manifolds, and TTE780 turbos. So far so good on the break in- full power runs should be coming soon and by the looks of the break in chart, they are going to yield some awesome results.

While not a new grind really, the specs are what I would expect to see on a well built engine looking to make sure of mid-high end power. Your friend mad a great choice. Would also like to know what center line he went with when he installed them (did he get the adjustable intake sprockets?)

Too bad the lift isn't a little higher on them though.

[Mikse]

Tried 5052 cams with 770 but the starting point (cams in stock position) was so disappointing didn´t even want to start adjusting them (huge PITA). Lost mid range and didn´t gain anything in top end :/

[replica_rs4]

While not a new grind really, the specs are what I would expect to see on a well built engine looking to make sure of mid-high end power. Your friend mad a great choice. Would also like to know what center line he went with when he installed them (did he get the adjustable intake sprockets?)

Too bad the lift isn't a little higher on them though.

There is an adjustable sprocket on exhaust cam ,but its for adjusting intake cam centerline. Cam card says intake lobe is 120 degrees . I wonder where 120 degrees is relative to the sprocket . I sent out an email and called cat cams with no luck.
I would love to know lift @tdc for different centerline settings. It would make playing around with cam advance a breeze, rather then doing it the hard way of calculating centerline.

Thanx.

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[replica_rs4]

Tried 5052 cams with 770 but the starting point (cams in stock position) was so disappointing didn´t even want to start adjusting them (huge PITA). Lost mid range and didn´t gain anything in top end :/

I assume cams in stock position is what cam card says . 120° intake centerline would most likely give you gains some where past redline.
How far did you rev out before and after install?

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[Drehmoment]

Explained here https://www.youtube.com/watch?v=eSxaO1nxdv0 if you speak german.

[Mikse]

I assume cams in stock position is what cam card says . 120° intake centerline would most likely give you gains some where past redline.
How far did you rev out before and after install?

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Revved only to around 6500-7000rpm. MAF values to compare 4000rpm catcams were behind upto ~6000rpm and went even with RS4 from there.
Sure those cams would've make more power after multiple tries and errors but just not worth the time and money it would have taken.

And I just don't understand the exhaust cam specs. Exhaust side is the most important part of making power and 4052 only have 9.55mm lift??

[NOTORIOUS VR]

Revved only to around 6500-7000rpm. MAF values to compare 4000rpm catcams were behind upto ~6000rpm and went even with RS4 from there.
Sure those cams would've make more power after multiple tries and errors but just not worth the time and money it would have taken.

And I just don't understand the exhaust cam specs. Exhaust side is the most important part of making power and 4052 only have 9.55mm lift??

The biggest issue in your situation was that you dropped them in stock location.. I'm not even sure why you would do that. All aftermarket cams need to be degree'd and set for you power band.

It's not the cams fault.

[okkim]

You got to start from somewhere. Or how would degree those in the first time?

[NOTORIOUS VR]

You got to start from somewhere. Or how would degree those in the first time?

Starting from somewhere on aftermarket cams isn't a thing. You degree them by measuring them in an engine. Then you know relative to TDC where to set the cams from that point forward.

[okkim]

Yes. Degree in what position?

[NOTORIOUS VR]

Yes. Degree in what position?

Depends on your setup really... what turbo (hot side), manifolds, intake, etc you have.

[Mikse]

The biggest issue in your situation was that you dropped them in stock location.. I'm not even sure why you would do that. All aftermarket cams need to be degree'd and set for you power band.

It's not the cams fault.

Like said above you have to start somewhere, stock seemed logical. There are quite a few people running these cams but it seem to be "national secret" how these cams are usually degreed. No one either don´t know, don´t remember or for what ever reason can´t tell. If I would have known a sweet spot to "someones setup" I would start from there.

And as I said I don´t deny these would have made power (@ x rpm) but just wasn´t worth it at the time I had a chance to test them.

[okkim]

Depends on your setup really... what turbo (hot side), manifolds, intake, etc you have.

Yes, but how can you know the best position without testing? You cant. So you have start from somewhere and the cam spec default position would seem most logical. At least I don't know any data sheet exists where the cam positions are explained with different setups.

[NOTORIOUS VR]

Yes, but how can you know the best position without testing? You cant. So you have start from somewhere and the cam spec default position would seem most logical. At least I don't know any data sheet exists where the cam positions are explained with different setups.

Of course you can make educated guesses of where to start. Default position doesn't seem logical at all to me really.

[Drehmoment]

You got to start from somewhere. Or how would degree those in the first time?

Watch the video I linked, depending on turbo size exhaust/intake 08-1.2 mm valve overlap in relation to TDC, you might have to repeat it a couple of times to find the sweet spot but it only takes a couple of hours of wrenching.

[replica_rs4]

Watch the video I linked, depending on turbo size exhaust/intake 08-1.2 mm valve overlap in relation to TDC, you might have to repeat it a couple of times to find the sweet spot but it only takes a couple of hours of wrenching.

I don't speak any German , but 0.8 - 1.2 mm is intake valve lift @tdc . overlap would be measured in degrees.
I emailed cat cams . if I do get a reply I will post valve lift measurement for respective lobe centerline.


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