Advancing cam question
Thread Starter
TECH Apprentice
Joined: May 2006
Posts: 308
Likes: 0
From: Nebraska
Advancing cam question LS1 cam install experts,
I'm back to my cam install....trying to get my "bearings" straight ...I found TDC, ICL is 114, I've got the cam sprocket at "6 O'Clock" and the adjustable crank/sprkt in the 0 straight up position. If I want to advance the cam 4%..(here's where I start to get fuzzy...) do I move the cam sprocket forward(clockwise) and re-install the timing chain?...or do I just move the crank shaft/key counter-clockwise...and re-install the chain?
stroker2112
I'm back to my cam install....trying to get my "bearings" straight ...I found TDC, ICL is 114, I've got the cam sprocket at "6 O'Clock" and the adjustable crank/sprkt in the 0 straight up position. If I want to advance the cam 4%..(here's where I start to get fuzzy...) do I move the cam sprocket forward(clockwise) and re-install the timing chain?...or do I just move the crank shaft/key counter-clockwise...and re-install the chain?
stroker2112
Thread Starter
TECH Apprentice
Joined: May 2006
Posts: 308
Likes: 0
From: Nebraska
..I'm thinking it should be done....after advancing 4 deg the valve events are:
10 BTDC IVO
50 ABDC IVC
52 BBDC EVO
4 ATDC EVC
110 ICL , 14deg overlap
...its a 240/244 in a NA 408 ...
10 BTDC IVO
50 ABDC IVC
52 BBDC EVO
4 ATDC EVC
110 ICL , 14deg overlap
...its a 240/244 in a NA 408 ...
Thread Starter
TECH Apprentice
Joined: May 2006
Posts: 308
Likes: 0
From: Nebraska
GreatwhiteSS,
If I advance the crank & keyed sprkt clockwise ...then doesn't this cause the intake valve to open later on the intake stroke?....
So, to make the intake valve open earlier (from 6* BTDC to 10* BTDC)...I need to advance the cam in relation to the crank....right? So would'nt I need to move the crank key/srpkt counter clockwise?....
This is where I get fuzzy.....
stroker2112
If I advance the crank & keyed sprkt clockwise ...then doesn't this cause the intake valve to open later on the intake stroke?....
So, to make the intake valve open earlier (from 6* BTDC to 10* BTDC)...I need to advance the cam in relation to the crank....right? So would'nt I need to move the crank key/srpkt counter clockwise?....
This is where I get fuzzy.....
stroker2112
Trending Topics
Thread Starter
TECH Apprentice
Joined: May 2006
Posts: 308
Likes: 0
From: Nebraska
Yes,
The cam is on a 114LSA+0 grind....it specs out on the degree wheel...so I am wanting to advance it 4*....just having some confusion on what part to advance....cam sprkt or crank sprkt...and if its the crank sprkt...which way?.....clockwise or counter-clockwise...thanks in advance...what I think is diff then what some people have posted...
The cam is on a 114LSA+0 grind....it specs out on the degree wheel...so I am wanting to advance it 4*....just having some confusion on what part to advance....cam sprkt or crank sprkt...and if its the crank sprkt...which way?.....clockwise or counter-clockwise...thanks in advance...what I think is diff then what some people have posted...
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
TECH Enthusiast
Joined: Jul 2006
Posts: 638
Likes: 0
From: San Diego
Originally Posted by Stroker2112
Yes,
The cam is on a 114LSA+0 grind....it specs out on the degree wheel...so I am wanting to advance it 4*....just having some confusion on what part to advance....cam sprkt or crank sprkt...and if its the crank sprkt...which way?.....clockwise or counter-clockwise...thanks in advance...what I think is diff then what some people have posted...
The cam is on a 114LSA+0 grind....it specs out on the degree wheel...so I am wanting to advance it 4*....just having some confusion on what part to advance....cam sprkt or crank sprkt...and if its the crank sprkt...which way?.....clockwise or counter-clockwise...thanks in advance...what I think is diff then what some people have posted...
Originally Posted by Stroker2112
Yes,
The cam is on a 114LSA+0 grind....it specs out on the degree wheel...so I am wanting to advance it 4*....just having some confusion on what part to advance....cam sprkt or crank sprkt...and if its the crank sprkt...which way?.....clockwise or counter-clockwise...thanks in advance...what I think is diff then what some people have posted...
The cam is on a 114LSA+0 grind....it specs out on the degree wheel...so I am wanting to advance it 4*....just having some confusion on what part to advance....cam sprkt or crank sprkt...and if its the crank sprkt...which way?.....clockwise or counter-clockwise...thanks in advance...what I think is diff then what some people have posted...
Thread Starter
TECH Apprentice
Joined: May 2006
Posts: 308
Likes: 0
From: Nebraska
SLP.....I moved the crank sprkt counter-clockwise (from 2:00 O'Clock to 10:00 O'clock....2 keys ) last night....and will test ICL again after all the kids in my house leave me alone....
Thread Starter
TECH Apprentice
Joined: May 2006
Posts: 308
Likes: 0
From: Nebraska
No advance...card says it has a 114* ICL. I just spent last 3 hrs trying to dial this in...I think I'm pretty close to my goals...within 1* of my IVO (10*) and an approx 112* (wanted 110*) ICL. After doing this for several hrs with varying results and with the equipment I have...I think I'll settle for what I got....then again, tomorrows another day....
Stroker2112
Stroker2112
Thread Starter
TECH Apprentice
Joined: May 2006
Posts: 308
Likes: 0
From: Nebraska
...I haven't put the engine back together yet (heads, valetrain ,intake), it's on a stand....I'll probably go back to check my work in an effort to get it closer to 110LSA later this week.....I'll still need to find a tuner after I get everything put back together...
Thread Starter
TECH Apprentice
Joined: May 2006
Posts: 308
Likes: 0
From: Nebraska
advancing cam 4* follow-up OK, so I've got everything buttoned back up.....took her for a test drive and it appears to have some new found power, especially in the mid-to-high rpm range (swapped in a 240/244). Now I just need to get it tuned ....pretty sure it's lean with all the new found "air" ...(bigger intake manifold, bigger cam)...it sounds mean as hell with just a little pedal/gas action....doesn't idle by itself yet....
stroker2112
stroker2112
