My new roller cam arrived yesterday from TA. I messaged JW at Tri Shield about what he recommended for my combo, he suggested to take a step back in duration... 240 or under @ .050 I talked with Tim at TA, went over some roller profiles, I settled on 236 @ .050 Lift is .530/540 (cam card is in box, I don't remember) Overlap is 8 deg. Duration is less than the 413 Lift is a bit more than the 413 Overlap is a few degrees less than the 413 TA said I can use the same springs as the 413 (good!) I have to install .060 shims to get open/closed pressure up a bit, that sucks, as its a pain with dual springs, and the AC box in the way, so I have to remove engine mount bolts and raise/roll the engine for room. I'm going to assume I need a solid roller lifter to degree the cam, yes?
Nope, see the pictures in post #5, http://www.v8buick.com/showthread.php?220945-Camshaft-degreeing-101 Good luck, should work great.
Nice move to roller. Was this one they suggested for your combo knowing you have the sp3 intake? Would make sense to get something that takes advantage of it.
Yes, I gave Tim ALL my info on my build, the only thing I couldn't nail down was my compression ratio, the only info I could tell him was my cranking compression was between 175 and 185 lbs with the 413 cam, he said "wow" My low end was awesome with the 413 I'm curious what its going to be like with the roller with a bit less duration, and less overlap I'm also anxious to see how it changes the characteristics of the engine, like apples to oranges:shock: Hope I can make it to the track at least once after install:grin:
AHAA! I forgot about using the edge of the lifter! After I degree it and find out where on the crank gear the timing set needs to be, I'm going to take the cam to Michaels and have the oil transfer groove in the number one bearing journal spray welded closed. I had asked Tim if they had cores with no groove, he told me the big blocks are the only ones they have like that.
For sure Justin! When I talked to Tim at TA, he said the roller cam is somewhat uncharted territory for the 350, being I like challenges, (like the SP3) I said "I'm game" I feel pretty confident being I took a few steps down in "size" per JW's advice:TU: I just looked at the cam card again this morn. I was WAAAAY off on how much lift tho, this cam is near .600
I'm surprised it's a straight pattern cam. Didn't seem to go down any from the 413. That's some high cylinder pressure too. My motor years back with hyperutectic Pistons and poston 118 cam had about 155 psi. Heavy torque at 3000 but zip under it.
Mark; Something appears to be wrong with cam card. .355 lobe lift at cam x 1.6 rocker ratio = .568 valve lift, not .586 My cam is .365 x 1.6 = .584 ***CAREFUL on the install. *** Just remembered I had to grind the front counterweight to clear cam lobe. Don't know if you can see everything well enough without having the oil pan off. I used a .040 copper wire, bent at a right angle to gauge the clearance between crank and cam lobe.
I am surprised as well that it is a straight pattern cam. Would be a good match for the new aluminum heads? The TA 413-350 is 234/244 @ .050, http://www.taperformance.com/proddetail.asp?prod=TA_413-350 I just did a quick DCR calculation. At 10.0:1 SCR, and 109 ICL, I get 7.32. Why does the cam card not tell you what to degree the intake lobe to? At the listed intake and exhaust opening and closing events, the DCR is 7.03. Is the cam meant to be installed straight up?
Maybe they sent you the wrong cam? Wasn't someone else on the v8 with roller had a much bigger cam then they thought? And Mike from TA also wondered why his cam wasn't what he thought he would have suggested?
Who is the correct person to talk to at TA about cams then? To call, and talk to someone for half an hour, giving all the information of your build, and then not getting the correct cam would really suck.....could you imagine if the person wasn't on any forums, and had the engine installed, and running, only to find out it was the wrong cam?
Just going by what mark posted originally that cam was 530/540 . Doesn't seem to match . Could have pulled wrong cam off shelf. Like I mentioned that I read on here someone else with roller cam having a problem and Mike from TA said that he would not have suggested that cam for that persons combo. Mistakes happen. Just like Mart pointed out the math was wrong on cam card.
Anyone have any technical discussion pertaining to the reasons behind questioning the validity of the single pattern cam being used with new aftermarket heads?
Folks, I spent a lot of time on my son Michael's combo when we first built his 350. The cam I chose was just a little more lift and less duration than Mark's. We also were around 10.0:1. Michael's cam was .365" lobe and 231' @.050 on 113' LS. I degree it straight up. Intake center line on 113'. All the simulations showed this to be the best location. Michael's 350 had TA custom 10.1 compression forged pistons, that cam, TA dual plane intake, 800cfm QJ carb, heads that flowed 248 on the intake, T350 trans w/TransGo #2 shift kit, TA 3500 stall (a little loose in my opinion for a street car like this), 3.36 rear gear, TA Perf No Hop bars, TA 1-5/8 headers, TA 2-1/2 exhaust to the rear bumper with long case Dyno Max mufflers. Had heavy street BFG front tires on factory mags and some old borrowed 9" slicks beyond the wear indicators. Michael never installed a tack or the console I got him so he just put it in drive and launched from idle, trans shifted it's self. First pass was a 12.97, ended the day with a 12.69. On 91 octane. Mark your cam is so close with just a little more duration, and I wanted a little more duration for Michael's but it cam in at 231'. I spent a lot of time simulating many different cam spec's including split pattern cams. I put the cam on 113' so it would drive on pump gas with 10.1 compression. 93 octane would be better. This straight pattern cam showed the best, and it ran very well.
Did someone question that validity? As far as I know, Mark has stock iron heads. Maybe Tim recommended that cam with an eye for the coming 350 aluminum heads? Jim recommended my cam, and it has split duration, and I have pretty good heads.:grin:
Sounds like Mike has put some effort into this cam design. Hope it's works well with the single plane as well
I really liked the 413 cam, tons of low end, idled great in gear at 750 rpm, pulled hard to 6 plus grand. It seemed tho a couple lobes were getting kinda flat, nothing major, but it was starting. The 413 was very similar to the 310 as far as running characteristics.
