Can you trow in a set of 1.6RR in any type of setup? no matter what cam you have or type of heads or intake? what if you have stock cam and heads like myself and a 383 SB?

What do 1.6 roller rockers do exactly?

 

1.6s will magnify your cam profile by 6.7%

So... slightly higher lift, and slightly longer useable duration. It won't actually open the valve longer (since zero lift times 6.7% still equals zero), but it'll open the valve faster, which effectively increases duration, such as at .05" or what ever you measure it at.

At some point, too much cam and too high a ratio will cause coil bind.

 

:iagree:

 

So? it make the valve open faster.. not higher or longer.

If I understand it also increases the amouth of air going into the combustion chamber... right?

I'm just curious, but would you know if a 1.6 RR is comparable to a 219 cam? in any way? Its recommended for a Super Ram intake... and could you put 1.6RR on an engine with a 219 cam?

I have a 383 stroker and I want to put on a super Ram for the main reason that I think my 383 needs it... but Its also recommended to put a 219 cam in there also, but its A LOT of extra work to put in a 219 cam compared to just bolting on the super ram intake.

Would putting 1.6 RR compare a bit to putting in a 219 cam? or will it help my cause if I don't put in a 219 cam.

Thank for any explanation.

 

what is coil bind? :confused:

 

It makes the valve open faster AND higher, but not longer.

Here's a highly technical effective cam profile of what I'm talking about.

X axis is time, Y axis is valve lift.

.................................:D:D:D: D....................................... ...................
.........................:D............. ............:D.......................... ...................
....................:D.........:):):):). .....:D................................. ...............
................:D.......:)............. ...........:)....:D..................... ...............
.............:D....:)................... ................:)...:D................. .....................
...........:D...:)...................... ..................:)..:D................ .........................
..........:D.:)......................... ....................:)..:D.............. ...........................
.........:D:)........................... ......................:).:D............. ...........................
.....:D:)............................... ..........................:):D.......... ..........................
:(:(.................................... ...............................:(:(:(:(: (......

Total duration is unchanged. LSA is unchanged. Overlap is unchanged. These are things you'll only get from a cam swap.

:D = with 1.6 RR's
:) = with 1.5
:( = base circle

As you can see, the 1.6 merely magnifies the movement of the valve.


[Modified by CentralCoaster, 3:43 PM 9/25/2003]

 

I can't help you much with matching up cams and intakes though.

Coil bind is when the coils on the valve spring contact eachother. VERY BAD! The spring can only compress so much before bottoming out.

Since your valve is lifting higher (moving down further) the spring must allow that extra movement.... ie thinner coils, or less coils, or something to that effect.


Do you need a grease monkey with a college degree to be your Corvette slave? My labor rates are unbeatable! :D

 

Sorry if I missred your questions, but I got the impression you are thinking that rockers and cams are comparable items. Please pardon me if you know all this . . . but a cam is ground with a certain lift that is significantly less than what you see in the catalogs. This is due to a number of things, but one is that if this was not the case, the cam will hit the rod bolts - thus some rod combos need to be ground. What the rockers do is essentially multiply the gross lift of the cam grind to get you to a net lift as advertised.

So when you consider going to a higher ratio rocker, you are multiplying the cam by a bigger number, this increasing it's net lift effect.

So if you had a .500 lift cam with 1.5 rr and went to 1.6rr, you would calculate the new new cam lift like this 1.6X.500/1.5 = .533 lift. (however you should actually calculate backwards from the .500 first to get the most accurate numbers, but this is way is simple and gives you a good estimate).

Most set-ups can accomodate a rr increase of .1, but you really should talk to an engine builder, especially since yours is not a stock set up anymore. You would need to make sure the valve springs can handle the increased lift and that you have plenty of piston to valve clearance.

 

1.6rr reduce friction and open the valves quicker, thats what gives the HP gains.

It is not the same thing as putting in a Camshaft. They are two totally different things.

You can put the 1.6rr on your current engine, or with the 219, it'll give some power either way. You would probably not be hurt by not putting them on the SR-219.

You need to start ordering some books on Small-Block Chevy's, and start reading.

 

Very nice. :cheers:

 

Great use of tools at hand :cheers:

 

No kidding. :thumbs:

 

Thanks for the explanation guys,

I did open some books "a few weeks ago" I read "how to rebuild a small block chevy" and "how to build performanced on a budget" writen by David Vizard.

I didn't understand the hole book though, some parts were a bit to "complicated" and not visual enough for me to understand. It was like I was suposed to know what I was reading before I started to read.. if this makes sence... I was a completly new newby when I read the books. :rolleyes:
But it did help me to understand the major mechanics of the engine.

I guess I just need a lamen term explanation at times, just to get started on the right foot.

I'll re-read my books very soon, and I'll probably understand every single thing because of you guys.

Thanks for the help
:)

 

If you want to start with the basics here's a good place to begin.
http://auto.howstuffworks.com/engine.htm

There is a ton of good info on this site. Sometimes it doesn't go into quite as much detail as you may want, but it's a real good start.

 

hahaha, cool!

but I already read that site... the funny part is that I read it after David Vizards books. :lol:
talk about doing things upside down

Sorry if I ask stupid question guys, I'm just learning.... all part of the learning curve.... I was told :skep:

 

If you dig a little deeper you can find more info.

Camshafts?
http://auto.howstuffworks.com/camshaft1.htm

Igntion?
http://auto.howstuffworks.com/ignition-system.htm

Brakes?
http://auto.howstuffworks.com/disc-brake.htm

That site has everything from firearms to VCR's. I've read about all the ones that interest me though

 

really cool! thanks for the links.. I'll read up!