Cam experts inside,L92 related..
It was a article in a Corvette mag about the LS3 motor which has the same heads as the L92. They said GM was trying different combo's with the cam's & new heads to make it cleaner burning low/mids on up. They found a extra 30 hp because of velocity
port design & cam design. Getting a better cleaner cylinder & using the large intake for a clean full A/F charge. That is why the 3 crate motors for the LS3 coming out soon go up to 515 hp N/A with cam & compression changes. Bigger is not better the spec's on the 515 hp motor are mild lifts more in lobe design & ramps with mild duration. Take what they are doing to get a good combo that has street manners VIA what Rick at Synergy is doing with his cam design. Again guy's this is a better head then given credit if you pick the correct cam which most don't that I have seen. I will be running the Synergy cam from my research it is dead on. After Jan I will be posting feed-back.
port design & cam design. Getting a better cleaner cylinder & using the large intake for a clean full A/F charge. That is why the 3 crate motors for the LS3 coming out soon go up to 515 hp N/A with cam & compression changes. Bigger is not better the spec's on the 515 hp motor are mild lifts more in lobe design & ramps with mild duration. Take what they are doing to get a good combo that has street manners VIA what Rick at Synergy is doing with his cam design. Again guy's this is a better head then given credit if you pick the correct cam which most don't that I have seen. I will be running the Synergy cam from my research it is dead on. After Jan I will be posting feed-back.
So, everyone is right by telling me my 257/266 cam on a 110 is the wrong cam for my car? I am starting to believe them but the car has alot of power. Just want to wait until a definite L92 427 tested cam comes out. Great info guys.
your 427 can tolerate a lot more duration than a 6.0...what's the ICL of your cam?
On The Tree
Joined: Sep 2007
Posts: 107
Likes: 0
From: Oklahoma
It's whats in a usable power band & not peak dyno number on a street/strip auto. No fun driving a bucking jumping car at low speeds or having to have a 4,000 stall to get in the power-band on a DD. I like to have both world myself & still go fast. Street manners & fast is the goal. Some people buy cams for the idle & big spec's. Think about it if it's a DD not a track only or trailer car. If is a trailer queen just go solid lifter. I want to drive to the track & home with the air on & kick but at the track. Two kinds of thinking. Old thinking is changing for the best of both worlds.
It's whats in a usable power band & not peak dyno number on a street/strip auto. No fun driving a bucking jumping car at low speeds or having to have a 4,000 stall to get in the power-band on a DD. I like to have both world myself & still go fast. Street manners & fast is the goal. Some people buy cams for the idle & big spec's. Think about it if it's a DD not a track only or trailer car. If is a trailer queen just go solid lifter. I want to drive to the track & home with the air on & kick but at the track. Two kinds of thinking. Old thinking is changing for the best of both worlds.
and was as quick as cars with bigger cams..
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now take all that the Rick and Louis know..... and put it in my equation and common theory goes bye bye.
4.030 bore/4.000 stroke, A3, 4k+stall, Nitrous, Carb Style Single Plane Intake, Ported LS3/L92 heads.
what do you get? (besides a slow car NA
) Totally different cam specs and ideas. I must make the perfect guinnea pig for cammin a 08 Vette headed F-body!
4.030 bore/4.000 stroke, A3, 4k+stall, Nitrous, Carb Style Single Plane Intake, Ported LS3/L92 heads.
what do you get? (besides a slow car NA
) Totally different cam specs and ideas. I must make the perfect guinnea pig for cammin a 08 Vette headed F-body!
Much smaller than what I had. ...... ummmm actually waaaay smaller. He said that he wanted to start the port velocity for the head off right and build it with the right lobe. Also wanted much power under the curve. Basically once I told him that I enjoy driving the car on the street and having fun, he went the opposite of what I had in mind. To be truthful in the long run I know it will be a wise choice, as I told Rick... it was just a tough pill to swallow when we all "think" bigger is better. Maybe that all applies to peak dyno numbers... but like he said "constant power under and thoughout the curve" is what wins races.
Was I shocked when I got the cam and card....... just a bit.... but he did say on our 2nd call (which was over 50 minutes on the phone long distance for him) that I would think this was a small cam. So cant say It knocked me off my feet.
Much smaller than what I had. ...... ummmm actually waaaay smaller. He said that he wanted to start the port velocity for the head off right and build it with the right lobe. Also wanted much power under the curve. Basically once I told him that I enjoy driving the car on the street and having fun, he went the opposite of what I had in mind. To be truthful in the long run I know it will be a wise choice, as I told Rick... it was just a tough pill to swallow when we all "think" bigger is better. Maybe that all applies to peak dyno numbers... but like he said "constant power under and thoughout the curve" is what wins races.
Was I shocked when I got the cam and card....... just a bit.... but he did say on our 2nd call (which was over 50 minutes on the phone long distance for him) that I would think this was a small cam. So cant say It knocked me off my feet.
Was I shocked when I got the cam and card....... just a bit.... but he did say on our 2nd call (which was over 50 minutes on the phone long distance for him) that I would think this was a small cam. So cant say It knocked me off my feet.
Our biggest difficulty is getting cutomers to step up and run smaller cams with the high flowing L92 heads. For some reason the idea that less-is-more doesn't seem to connect in this area. Yet the trend is emerging.
We see the L92 and L76 intake manifolds as rpm limiters. Limiting peak rpms means limiting peak horsepower capability. Engines with cams larger than the mid 230º's really carve a hole in the low and mid range and only deliver a few extra hp up top.
I am optomistic the aftermarket intakes will deliver the high rpm power that the factory intakes do not.
Best of luck with the cam choice.
Richard
I for one am interested in your follow up comments on the small cam's overall power band.
Our biggest difficulty is getting cutomers to step up and run smaller cams with the high flowing L92 heads. For some reason the idea that less-is-more doesn't seem to connect in this area. Yet the trend is emerging.
We see the L92 and L76 intake manifolds as rpm limiters. Limiting peak rpms means limiting peak horsepower capability. Engines with cams larger than the mid 230º's really carve a hole in the low and mid range and only deliver a few extra hp up top.
I am optomistic the aftermarket intakes will deliver the high rpm power that the factory intakes do not.
Best of luck with the cam choice.
Richard
Our biggest difficulty is getting cutomers to step up and run smaller cams with the high flowing L92 heads. For some reason the idea that less-is-more doesn't seem to connect in this area. Yet the trend is emerging.
We see the L92 and L76 intake manifolds as rpm limiters. Limiting peak rpms means limiting peak horsepower capability. Engines with cams larger than the mid 230º's really carve a hole in the low and mid range and only deliver a few extra hp up top.
I am optomistic the aftermarket intakes will deliver the high rpm power that the factory intakes do not.
Best of luck with the cam choice.
Richard
Richard.... the interesting thing about my previous L92 GMPP intake dyno (minus the quality of the tune aside {limited dyno time etc and SD experience}.... but really how difficult is it to nail A/F on the dyno in 2-3 pulls??) was pretty shocking nonetheless with the 244/248 cam..... it didnt seem to gain power after 125mph to around a 6300 or so RPM at 140mph..... the unported intake didnt help up top all that much.
Last edited by WizeAss; Jan 26, 2008 at 12:12 PM.
Much smaller than what I had. ...... ummmm actually waaaay smaller. He said that he wanted to start the port velocity for the head off right and build it with the right lobe. Also wanted much power under the curve. Basically once I told him that I enjoy driving the car on the street and having fun, he went the opposite of what I had in mind. To be truthful in the long run I know it will be a wise choice, as I told Rick... it was just a tough pill to swallow when we all "think" bigger is better. Maybe that all applies to peak dyno numbers... but like he said "constant power under and thoughout the curve" is what wins races.
Was I shocked when I got the cam and card....... just a bit.... but he did say on our 2nd call (which was over 50 minutes on the phone long distance for him) that I would think this was a small cam. So cant say It knocked me off my feet.
Was I shocked when I got the cam and card....... just a bit.... but he did say on our 2nd call (which was over 50 minutes on the phone long distance for him) that I would think this was a small cam. So cant say It knocked me off my feet.
wow,that's not a lot of overlap for a 408....
after talking to a few people,and going over these threads on L92s i'm starting to learn why they don't like a lot of overlap,and why GM chose to run them in their SUVs....if i had the money,i would put together a mild package for my GTO..maybe next year...
thanks for sharing....
after talking to a few people,and going over these threads on L92s i'm starting to learn why they don't like a lot of overlap,and why GM chose to run them in their SUVs....if i had the money,i would put together a mild package for my GTO..maybe next year...
thanks for sharing....
Teching In
Joined: Jun 2006
Posts: 48
Likes: 0
From: Winnipeg, MB Canada
L92 Cam with 427cid If you want to see it idle check out the link below:
http://videos.streetfire.net/video/d...5c00ff1be4.htm
I think Katech nailed it with this combo - 233in, 276ex, 107lsa .595 lift - pulls hard from 2,000rpm to 6,200rpm (hang on) 604chp @ 6199rpm and 566ctq at 4,400 rpm - Idles great, sounds great, melts rear tires at will.
If you want to see it idle check out the link below:
http://videos.streetfire.net/video/d...5c00ff1be4.htm
If you want to see it idle check out the link below:
http://videos.streetfire.net/video/d...5c00ff1be4.htm