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Author Topic:   Cam questions
Fastymz
Moderator

Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001

posted 02-08-2003 02:44 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
I know every one is going .

1.I got an idea of what lope separation is.But why do some cams have a 110 or 114 separation.Whats the advantage or disavantage to more or less serparation.

2.Lift is just the amount the valve is opened.
Lift duration is the amount of time the valve is open.

What and why would want more lift or duration.

And why is it measured at .050.
And why is advertised duration different then at .050.

And any other information would be great.

Thanks for the help again.

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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Dubz
Gearhead

Posts: 1718
From: Manitoba Canada
Registered: Oct 2002

posted 02-08-2003 03:31 PM     Click Here to See the Profile for Dubz   Click Here to Email Dubz     Edit/Delete Message   Reply w/Quote
As far as i know, more lift and duration meens that you will get more air/fuel flowing through into the cylinder.

Duration is measured at .050" because that is the time when we are to assume that the valves open enough to start flowing air.

I guess that advertized duration shows when the cam actually starts it's lobe, so this would show you along with the .050 measurement the velocity of the intake/exhaust sweep

Wider Lobe separation gives a flatter torque curve than a narrow one (the greater LDA provides less peak power, and the smaller LDA provides more, but only for a short rpm range)

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1974 Gran Torino, 351W

Just a young buck My Page

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Fastymz
Moderator

Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001

posted 02-08-2003 04:03 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
Thanks for the help.

So what is the range of the numbers of lope separation.
Like a 110 would be more flat then a 114.
But does that tell you an rpm number that the power will be made in?

And how much lift can stock heads take.

------------------
SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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Dubz
Gearhead

Posts: 1718
From: Manitoba Canada
Registered: Oct 2002

posted 02-08-2003 04:39 PM     Click Here to See the Profile for Dubz   Click Here to Email Dubz     Edit/Delete Message   Reply w/Quote
A 114 would be a flatter than a 110

It doesn't tell you what rpm the engine will make it's best power in no.

and i have no idea about the heads, sorry

------------------
1974 Gran Torino, 351W

Just a young buck My Page

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steve'66
Gearhead

Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000

posted 02-08-2003 05:00 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Ron,

The only mistake you can make with a cam swap is to overcam it. Your intake, heads, converter, and gears have to work together in the same rpm range. So a cam that'll pull in the 2000-5500 range will work good.
A 3000-6500 cam will slow your car down. This will be the right cam latter with a 750 Holley, RPM intake, good heads, exhaust, 3500 stall converter, and 4.10 gears.

SteveW

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n2oMike
Gearhead

Posts: 2419
From: Spencer, WV
Registered: Jan 2001

posted 02-08-2003 05:08 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
Check out these that were found using the 'search' function. Tons of info...

https://mustangsandmore.com/ubb/Forum12/HTML/002033.html

https://mustangsandmore.com/ubb/Forum12/HTML/001908.html

https://mustangsandmore.com/ubb/Forum12/HTML/002122.html

http://www.fordmuscle.com/phpBB/viewtopic.php?topic=1588&forum=1

Good Luck!

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Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

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Fastymz
Moderator

Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001

posted 02-08-2003 06:52 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
Thanks Steve,I just needed a few things cleared up.


Mike thanks for the the info.I do a lot of searching on here.But somethimes I have questions alittle different that what I've found.

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

[This message has been edited by Fastymz (edited 02-08-2003).]

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