Cam question
Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,469
Likes: 6
From: Winchester Ontario
Cam question
Hi there, I was just wondering the main differences in cam duration, and why some have split durations and the advantages/disadvantages of it.
I know a popular cam is the LPE 219 which is 219/219.
My cam is a lot milder, but is 222/226 durations.
Is the main difference that they have different durations (split/same) because the LPE is a roller cam?
My understanding (although very limited :D ) is that with a duration of:
219 is for more torque (RPM ranges of 2000-5000)
230 is for more HP (RPM ranges of 2500-6000)
The reasons I'm asking is because I'm helping a friend build his Mustang motor and I don't know whether to go with a split duration cam or not, and is my understanding of durations anywhere close? Cuz he'll want to spin his to like 6500-7000 RPM, so should I pick a split duration of like 230/244 with a .525 lift or so?
Thanks
I know a popular cam is the LPE 219 which is 219/219.
My cam is a lot milder, but is 222/226 durations.
Is the main difference that they have different durations (split/same) because the LPE is a roller cam?
My understanding (although very limited :D ) is that with a duration of:
219 is for more torque (RPM ranges of 2000-5000)
230 is for more HP (RPM ranges of 2500-6000)
The reasons I'm asking is because I'm helping a friend build his Mustang motor and I don't know whether to go with a split duration cam or not, and is my understanding of durations anywhere close? Cuz he'll want to spin his to like 6500-7000 RPM, so should I pick a split duration of like 230/244 with a .525 lift or so?
Thanks
Team Owner
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: Cam question (black_89_vette)
If youre asking if that 230/244 at .050" is good for higher rpm power, then yes, it will make good power. He might want some low gears in the back though.
Drifting
Joined: Mar 1999
Posts: 1,931
Likes: 1
From: Norcross GA
Re: Cam question (black_89_vette)
You are not asking a simple Q.
Take trip down to you bookstore or library. There is an article avery few months that talks about cams.
Short answer, match the cam to the application and the heads.
Basics: More durations,... power is made at the top end. Less duration, power is made at the low end. Split profile,... how well does the intake breath versus the exhaust.
You don't wanna learn what you are doing,... call cam Mfg. They will ask you 20 Q's, then give you a part #. (They do this all day long.)
First mistake most beginner engine builders make,... over cam and engine (too big).
Take trip down to you bookstore or library. There is an article avery few months that talks about cams.
Short answer, match the cam to the application and the heads.
Basics: More durations,... power is made at the top end. Less duration, power is made at the low end. Split profile,... how well does the intake breath versus the exhaust.
You don't wanna learn what you are doing,... call cam Mfg. They will ask you 20 Q's, then give you a part #. (They do this all day long.)
First mistake most beginner engine builders make,... over cam and engine (too big).
Burning Brakes
Joined: Aug 2002
Posts: 848
Likes: 0
From: Houston TX
Re: Cam question (ZylaRace)
Having built many Ford roller engines, let me chime in. The SB ford is known for it's exhaust port deficiencies, which is why cam manufacturers skew the lift/duration figures to favor the exhaust side. That's it, in a nutshell. By the way, what's good for a ford SB is not the same as what's good for a bowtie SB.
By the way, the cam you quoted is NOT a 7000 rpm cam, by a long shot.
[Modified by fullboogie, 4:19 PM 2/7/2003]
By the way, the cam you quoted is NOT a 7000 rpm cam, by a long shot.
[Modified by fullboogie, 4:19 PM 2/7/2003]
