extreme energy 282 cam

[rednotch88]

I know this may be a noob question...What is the lift different from 1.6 to 1.7 rockers on a EX 282HR cam? cam alone is .565int .574ext.

KJ

 

[89stang1]

Kinda of a guess from what i remember i think the same cam translates into a 100 more on the 1.7 rocker

 

[nick6690]

divide the lift by 1.6 and then multiply by 1.7

so around .600/.609

you also get more duration but im not sure how to figure that out.

 

[lincoln+ford]

i thought going from 1.6 to 1.7 usually ment add .30 to the lift

 

[rednotch88]

So what you guys think??what is the verdict?

 

[rednotch88]

divide the lift by 1.6 and then multiply by 1.7

so around .600/.609

you also get more duration but im not sure how to figure that out.

so what is the equation here...?

 

[nick6690]

.565/1.6= .353 .353x1.7=.600

.574/1.6= .358 .358x1.7=.609

those numbers aren't rounded btw.

 

[rednotch88]

cool.well what piston will have reliefs that big for 609 lift.???

 

[NIKwoaC]

Roller rockers do nothing but magnify the lift from the cam, based on the ratio of the RR. A lot of times, cam lift is stated assuming a 1.6 ratio, but you have to read the fine print. Roller rockers do not increase the duration, but again, it gets kind of confusing. A cam's duration is typically measured from some amount of measurable lift (usually .050 IIRC), rather than the actual opening event (where the dwell period ends but before any lift has begun). So if the RR magnifies the lift, the cam gets to .050 lift sooner, which makes the duration SEEM longer. Actual open to actual close of the valve does not change.

Also, maximum lift doesn't directly affect clearance needed. Its more a function of valve overlap between the exhaust and the intake strokes, and where the valves are during this period.

 

[rednotch88]

Roller rockers do nothing but magnify the lift from the cam, based on the ratio of the RR. A lot of times, cam lift is stated assuming a 1.6 ratio, but you have to read the fine print. Roller rockers do not increase the duration, but again, it gets kind of confusing. A cam's duration is typically measured from some amount of measurable lift (usually .050 IIRC), rather than the actual opening event (where the dwell period ends but before any lift has begun). So if the RR magnifies the lift, the cam gets to .050 lift sooner, which makes the duration SEEM longer. Actual open to actual close of the valve does not change.

Also, maximum lift doesn't directly affect clearance needed. Its more a function of valve overlap between the exhaust and the intake strokes, and where the valves are during this period.

but won't i have some clearance issues?piston to valve clearance?I need to learn a little more on the combustion chamber action ect..

 

[57fairlane]

but won't i have some clearance issues?piston to valve clearance?I need to learn a little more on the combustion chamber action ect..

thats why you clay it or use weak springs to check your actual clearance or lack of.

 

[90lxcoupe]

yea best way to find out is to check the piston to valve clearance, but if your running that cam why do you want to run 1.7 rockers? unless you really need the extra lift is kinda pointless, thats a good sized hyd. roller cam. whats the rest of the combo?

 

[rednotch88]

yea best way to find out is to check the piston to valve clearance, but if your running that cam why do you want to run 1.7 rockers? unless you really need the extra lift is kinda pointless, thats a good sized hyd. roller cam. whats the rest of the combo?

I don't know what the combo is going to be yet.I'm still working on the rear end/rear suspension.. I have a set of 1.7's already i'd like to use em.I would like it to be an all motor car-High compression ect....as for heads...I dono wtf i'm going to do.I juut built this whole car and not im running out of money when I get to the cool stuff.

 

[89-347-LX]

I don't know what the combo is going to be yet.I'm still working on the rear end/rear suspension.. I have a set of 1.7's already i'd like to use em.I would like it to be an all motor car-High compression ect....as for heads...I dono wtf i'm going to do.I juut built this whole car and not im running out of money when I get to the cool stuff.

dont cut corners. if you need to wait a little bit then do, call one of your buddys (when your motor is ready to be put together) and have him degree the cam for you and check PTV clearance. LIFT on a cam is one of the last things that matters when checking PTV clearance. do it right the first time

 

[rednotch88]

dont cut corners. if you need to wait a little bit then do, call one of your buddys (when your motor is ready to be put together) and have him degree the cam for you and check PTV clearance. LIFT on a cam is one of the last things that matters when checking PTV clearance. do it right the first time

cut corners

 

[stangboy]

I agree with 89-347-LX 100%. If you run out of money and end up with a car with hellified suspension with a stock motor, so be it until you build your funds back up to do the motor right. When I built my 94GT it took me 3 years of stock-piling parts before I actually put it all on the car. My car went from stock non-contender to a decent contender over the course of 2 weekends. It would have been 1 weekend but I ran into PTV clearance issues on Sunday night of the 1st weekend and had to extend the valve reliefs on my pistons with a dremel tool the next weekend.

The look on all my friends' faces when I was whoopin' a$$ and takin' names was priceless.