need opinions on this cam
06-02-2014, 12:42 PM
#1
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need opinions on this cam https://www.flickr.com/photos/124212...n/photostream/
This cam is in a ls3 12.5-1 carbed motor, motor is very much down on power and looking for the reason. this is a new build, stock heads with shaft rockers and springs came with the cam. have a mast intake on it also.
This cam is in a ls3 12.5-1 carbed motor, motor is very much down on power and looking for the reason. this is a new build, stock heads with shaft rockers and springs came with the cam. have a mast intake on it also.
06-02-2014, 02:53 PM
#3
https://www.flickr.com/photos/124212...n/photostream/
^--- I'm guessing he's trying to link you to the white page in the photos with the cam specs.
06-02-2014, 03:38 PM
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https://www.flickr.com/photos/124212...n/photostream/
Please tell me if you see numbers that don't look like the cam would work. have power glide trans with around 5.000 stall converter. car is 3100lbs 3350 with my butt in it.
Please tell me if you see numbers that don't look like the cam would work. have power glide trans with around 5.000 stall converter. car is 3100lbs 3350 with my butt in it.
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06-02-2014, 05:18 PM
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Valve events are suited to EFI long runner style intake, you'd need to advance that cam a further 4 degrees to get it close to where it should be, and even then I would say you'll be pushing the friendship between piston and valve clearance.
If it were my engine I would be looking for something around 241/257 @ 111+5
If it were my engine I would be looking for something around 241/257 @ 111+5
06-02-2014, 05:27 PM
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Roger at Vinci cams told me to put the lifters at .075 pre load and that's where I'm at. what do you guys set them at?
I am thinking of trying a .050 shorter push rod to see what difference it makes.
I am thinking of trying a .050 shorter push rod to see what difference it makes.
06-02-2014, 05:44 PM
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If cam is dialed in as per specs, the IVC of 52* is far too late, not sure what part of my response didn't make sense. This isn't a matter of needing opinions, it is a matter of the cam does not suit the application.
06-02-2014, 09:02 PM
#13
I have been in this discussion a lot lately with Martin Smallwood, Brian Tooley and Geoff at EPS. That intake valve close is just super late for a single plane equipped, square port headed, stock displacement LS3 with a 3200-7200 RPM projected power range.
If I were in your shoes, I would contact one of the 3 guys I have mentioned above. They know these motors and can get you the right cam.
Geoff at EPS has a shelf cam that would be about perfect for what you are doing. He calls it th LS single plane cam. One guy who is using it says it loves a 5000 converter and pulls to 7200 no problem. To give you an indication, it is 236/248 on 108. If i recall correctly, it has 2 degrees of advance ground in giving it an intake valve close a whoppong 10 degrees sooner than the one you currently have.
Last edited by speedtigger; 06-02-2014 at 09:50 PM.
06-02-2014, 10:05 PM
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If this thing is meant to be a race only car you could try advancing the cam 3-4 degrees, if piston to valve clearance will allow, and see how it responds.
06-03-2014, 09:36 AM
#16
I posted this 2 days ago in the other thread:
I am no cam expert but it looks like the intake valve is staying open longer on that cam than my L92 grinds. I have always heard that the L92 heads wants the intake valve closed by 45.
I can't post the picture but I checked out the link.
https://www.flickr.com/photos/124212...n/photostream/
I can't post the picture but I checked out the link.
https://www.flickr.com/photos/124212...n/photostream/
06-03-2014, 06:56 PM
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Not necessarily have to re-cam, the thing is retarded with those valve events. This whole 45* IVC theory really is based around more streetable cam design, and may not be what the OP is trying to achieve.
Speedtigger, I was going off duration/lsa specs, which comes out at 52* but the lobe design may not be asymmetrical either.
Take a look at the nitrous cam specs of the 408 posted in another recent thread, advance this cam 3 degrees and it would be very close to the same.
Speedtigger, I was going off duration/lsa specs, which comes out at 52* but the lobe design may not be asymmetrical either.
Take a look at the nitrous cam specs of the 408 posted in another recent thread, advance this cam 3 degrees and it would be very close to the same.
06-03-2014, 07:18 PM
#19
Not necessarily have to re-cam, the thing is retarded with those valve events. This whole 45* IVC theory really is based around more streetable cam design, and may not be what the OP is trying to achieve.
Speedtigger, I was going off duration/lsa specs, which comes out at 52* but the lobe design may not be asymmetrical either.
Take a look at the nitrous cam specs of the 408 posted in another recent thread, advance this cam 3 degrees and it would be very close to the same.
Speedtigger, I was going off duration/lsa specs, which comes out at 52* but the lobe design may not be asymmetrical either.
Take a look at the nitrous cam specs of the 408 posted in another recent thread, advance this cam 3 degrees and it would be very close to the same.
Last edited by speedtigger; 06-03-2014 at 07:43 PM.
06-03-2014, 09:19 PM
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Agree on the balancer, port the heads, advance cam, and it should start to really wake the thing up. Even at 376 cubes the cam could still potentially work out relatively okay for race application.