Funny how varied the specs are been looking for common threads in the best and worst in the list.
The ones at the bottom of the list tend to have less exhaust duration, overlap and have lsa on the wider side. Even though there's a few examples like that in the top.
I find the 2 BTR interesting they did well hp wise but fell way short on tq, but the worst one #2 seems more inline with the top players but the smaller one #1 did better even thought the specs are less like the top ones.
Agreed, it's a Dyno challenge...let er rip.Much respect for Weingartner for putting this one together and fulfilling it. Going that hard three days in a row has to be taking a toll on his health. I don't remember the exact spec on the 408 LS, but I thought the compression ratio was high enough (I was thinking near 13:1) to dictate a lot more duration than what any of the entries had. I would have like to have seen what something in the 250 to 260 @ .050 range would do, if nothing more than at the upper rpm with the monstrous head flow.
Yeah, i like the way Salter explains thingsI'm beginning to watch quite a bit of Brian salters channel. Seems like a kind fella.
Yeah, and I know of at least one Gen 1 SBC (383 stroker with decent ported iron "turbo 292" heads) street car ('70 Firebird) with near 12:1 that has 257/269 @.050 .493/.512 on a 108 LSA, 3.73 gears, and a T10 and it's got "just the right amount" of camshaft.Agreed, it's a Dyno challenge...let er rip.
They could've if they wanted to, 7th place, Quinton had a 255/261 cam, a lot of them had 250-260 exhaust but mostly 235-245 intake.. I would have like to have seen what something in the 250 to 260 @ .050 range would do, if nothing more than at the upper rpm with the monstrous head flow.
I'm not shocked at dv not doing well.Top peak tq was getting 1.39 tq per cid and lowest wasn't doing too bad at 1.33 tq per cid.
DV didn't too bad on tq, 1.36 per cid, came in 8th in peak tq and 10.5th in average tq, but blew it in peak power 20th out of 23 for an overall 14 th
1 pull on each cam? No jet changes? No timing changes?I watched the dyno days live both days at work.. man they were doing cam changes like 30 mins.. 1 pull.. rip it apart and onto the next one.. Very interesting data from it though
Yeah I'm going to switch up cams in my 470 soon, it's just under cammed, new will be from bullet 275-288 @.050/ .696 - .674 custom spec by newbomb turkYeah, and I know of at least one Gen 1 SBC (383 stroker with decent ported iron "turbo 292" heads) street car ('70 Firebird) with near 12:1 that has 257/269 @.050 .493/.512 on a 108 LSA, 3.73 gears, and a T10 and it's got "just the right amount" of camshaft.
You look for the trends, there is a somewhat pattern to it's seemingly randomness but in the end of the day its only one test for one engine. But does show there's probably many different ways to get there (similar results).273,
Thanks for posting.
I could never understand what this test would prove.....& still don't.
From what I could tell, all the parameters such as LSA, duration could be anything. So what actually is being compared?
In post #11 is what trends I see the worst ones generally have even though some of the top performers have some of the traits question is why, but generally they don't.273,
Thanks for posting.
I could never understand what this test would prove.....& still don't.
From what I could tell, all the parameters such as LSA, duration could be anything. So what actually is being compared?
The worst ones (bottom half of list) beside having seemly average wider lsa and less exhaust duration and overlap, the IVO seems to generally open later and EVC close sooner. Is what trends I'm seeing, the IVC & EVO variances seems to be somewhat averagely spread out from top to bottom.
Seems like all the top hp ones had exhaust duration in the 250-263 ones under 250 didn't seem to do to well hp wise. The ones that had 250+ exhaust but that were in the bottom 13 places but made good hp also had 11+ IVO & EVC but had poor torque they also had IVC in the 49-51 range.
Nope... the contestants had all the specs, and knew how it would be run and had to design a cam around those specs.. it was interesting..1 pull on each cam? No jet changes? No timing changes?
So its really a who can guess the best camshaft suited to the parts assembled.Nope... the contestants had all the specs, and knew how it would be run and had to design a cam around those specs.. it was interesting..
i wouldn't call it guessing, almost everyone in the competition is a professional engine builder using their own formulas for choosing cams. They were given every possible spec of the engine right down to the weight of the valves and retainers...So its really a who can guess the best camshaft suited to the parts assembled.
CorrectSo its really a who can guess the best camshaft suited to the parts assembled.