Ok so we all know that around a 212/218 cam is an awesome low end cam for a 5.3, but we also know that torque can be gained from overlap in a cam. So my question is this, what if you designed a cam with some overlap, but a small intake duration? Isn't intake duration the main deciding factor in rpm range of a cam, or am I not thinking correctly? Anyway, I played with the numbers and came up with a couple ideas.....

First: 210/240, .595/.609, 111 LSA, 107 ICL

This would give three degrees of overlap and therefore give us some scavenging in the cylinders, but I'm thinking that it should still make torque low in the rpm range due to the low intake duration. The narrow LSA would give a really peaky curve though.

Second: 212/242, .558/.592, 112 LSA, 108 ICL

This would likewise yield three degrees of overlap, but the wider LSA should give a better torque curve. But the slightly elevated durations will bring the curve higher in the rpms.


So has anybody tried this? I'm sure somewhere along the lines somebody has tested something like this idea but I have never heard of it. So is there some reason that this would just totally suck as a cam, or does just nobody do it? What's some opinions out there????

 

What are you hoping to gain with so much exhaust duration?

 

Well the idea is to gain torque due to the scavenging effects of the overlap between the lobes.....

 

ehh i wouldnt try and re-invent the wheel
Stick with what works and has been proven

 

I know, but I can't help it. I like to tinker with outlandish ideas and try strange combos with my engines......

 

From what iv seen and done cams like this have an even power curve from idle to rev limiter, power curve looks like a stock cams, at 2000rpm its got like 10 more hp and at 6500 its like 50 with an even gain of power throw the rpm range from the stock cam, Its a good choice if your running a stock stall and just want a little more power, an even dur cam wont pull as good off idle but will make more mid range and top end. I think you would be happyer with a 228r on a 110lsa +4 advance.

 

Why dont you grind a cam with thkse specs, install and get us a dyno of it..then we'll all know! Lol

 

Haha I wish I had the spare money and I would. My current cam does great, I was just curious as to whether anyone had experience with somethin like this......

 

Jake99, what kind of torque curve did you see with this type of cam? That is my real curiosity, if there was any torque gain with this sort of cam as opposed to, say, a 212/218?

 

I never done one with a split quite that far, my buddys ls7 z06 has a 224-246 cam in it on a 115lsa you the dont hardly lope at all and drives around real nice and pulls real well at low rpm, but I just dont think there is much of a gain at all over and ever split with a tight lsa and lots of advance. But thats just how they feel to me I have no solid proff of that.