cam question... 110 or 112 for a daily driver on highways

[ray6966]

I've got a 66 coupe project.. planning to use it mainly on the highway (60-70 mph)

i've been reading the articles on "Cam Selection"... I understand that cam with


a 112 would be better suited for higher speeds? any help on the topic will be appreciated..


thanks,

ray

 

[richard]

Which items are you considering? Good information here: http://classicinlines.com/SelectCam.asp

The lobe separation is reflectant upon the engine speed, in regards to power range within a certain rpm window. Now, are you asking about highway speed or engine speed? Whatever the factory camshaft profile is in my 80'mont I drive everyday on the highway in Atlanta (up to 35 miles freeway @ 80mph) and it does just fine, even with freeway gears and 28' tires in the back avg 21mpg. The further way from factory you get in lobe separation the less low engine speed rpm that will be "smoothly" useable.

 

[JackFish]

I have the 112, and it's pulling about 17hg vacuum.
Plenty for power brakes, automatic tranny, AC.
It's a strong highway runner, but has a sluggish low end the way it's set up right now.
3.08 rear gear.

 

[michael_cini]

You didn't mention if you have an auto or manual tranny.

 

[rbohm]

I've got a 66 coupe project.. planning to use it mainly on the highway (60-70 mph)

i've been reading the articles on "Cam Selection"... I understand that cam with


a 112 would be better suited for higher speeds? any help on the topic will be appreciated..


thanks,

ray

8) actually a cam with wider lobe separation is better for low speeds. the difference though between a 110 and a 112 lobe separation is about 200rpm or so given the same specs otherwise. for what you want the 112 cam will do nicely though, manual or automatic.

 

[ray6966]

hi guys, thanks for the replies...
I was referring to highway speed..just want to make sure the car can keep up
between 60-70 mph on the freeways.. I live in the Los Angeles Area.. I do most
of my driving on the freeways..

this is what I'm planning to use on my 66 Mustang Coupe

68 200 engine block - I havent rebuild it yet
DUI distributor
Dual roller Timing Chain
2v 2100 Autolite Carburator
T-5 Tranny (with a 9 inch clutch)

Aluminum Manifold (Classic Inlines)

Aluminum Head - Basic Street Set Up (Classic Inlines)
Waiting on Mike to Produce more..

8-inch rear end - havent checked the rear end ratio.
apparently a previous owner swapped
the orginal rear end for a 1967 rear end.
if its not 3.00 ratio, i'm going to swap it
for a rear end with a 3.00

Dual Exhaust headers (Classic inlines headers)

Flowmasters (2.5" In/Out) with X-pipes

15- inch tires

.......................................................................................................

I have the read the Article : Selecting a Proper Cam.

http://classicinlines.com/SelectCam.asp

and I came across the following part:

"You just need to decide which profile works best for your application. If you want a smooth idle and do a lot of highway driving, where passing power is of concern, the 112* might be a better choice. If you do a lot of light-to-light driving, don't mind (or prefer) a lopey idle, the 110* may be better suited. But if you want to eat V8's off the line and can live with a choppy idle, a 108-109* lobe center might be just the ticket. Basically, it comes down to a compromise between performance and idle quality, base on your specific driving requirements."
....................................................................................................................


and from that I am leaning in favor to the following cam on Classic Inlines..

http://www.classicinlines.com/proddetai ... 2DHSP%2D12


Just want to double check if this would work with what I have in mind..

Im using the car as a daily driver...

Ray
Lynwood, California

 

[michael_cini]

Since you are using a T5, I would suggest the 110 lobe center. I believe the article states that.

 

[rbohm]

I have the read the Article : Selecting a Proper Cam.

http://classicinlines.com/SelectCam.asp

and I came across the following part:

"You just need to decide which profile works best for your application. If you want a smooth idle and do a lot of highway driving, where passing power is of concern, the 112* might be a better choice. If you do a lot of light-to-light driving, don't mind (or prefer) a lopey idle, the 110* may be better suited. But if you want to eat V8's off the line and can live with a choppy idle, a 108-109* lobe center might be just the ticket. Basically, it comes down to a compromise between performance and idle quality, base on your specific driving requirements."

8) it has been my experience that the wider lobe centers are for lower to mid range rpm torque. it does this by pumping up the dynamic compression ratio and essentially tricking the engine into thinking the static compression ratio is higher than it really is. the narrower lobe centers actually reduce dynamic compression at lower rpms which in turn causes the lumpy idle you sometimes get with performance cams. the narrower lobe centers also pump up the power in the upper rpm ranges.

and from that I am leaning in favor to the following cam on Classic Inlines..

http://www.classicinlines.com/proddetai ... 2DHSP%2D12


Just want to double check if this would work with what I have in mind..

Im using the car as a daily driver...

Ray
Lynwood, California

this is an excellent cam choice for what you want. remember that at 70mph your engine rpms will be around 2700-3000rpm depending on gearing, and that is right in the middle of the cams rpm range.

 

[ray6966]

thanks guys.. this is very good stuff... I will keep you guys posted on my project..

 

[kevinl1058]

I'm running a dual pattern cam 268/78 109 lobe center.. Good fat idle and good highway cruising performance. I can only put 1,000 miles on the car with my insurance so I was all about performance with gas mileage last on the list. I have aT5 backing it up so it is a blast to drive.
Kev