Damn, I don't know whether you should trust that DesktopDyno rather than some dyno sheets. For engine simulation I was always leaning towards Engine Analyzer Pro, which is proven to be accurate, if you don't lie about the engine specs.... Lotus Engine Simulation is a step further, but more difficult. Were there a lot of inputs? Like combustion chamber design, flow tables, diameters all over the places and etc. I'm in doubt, because it seems like the numbers are a little underrated. And the torque curve drops way too fast.
So it comes down to the Dyno program Cameo is using is not trust worthy? Now Im even more confused on what to get Was set at the Bullet, but when Cameo threw in that the TA_25 was better all way up, I got hooked on a Schneider thats 2* bigger than the TA_25..
Yep, it shouldn't drop fast! Torque curves are very sensitive to wave tuning on intake and exhaust. So some manifold length input in the program might be incorrect. Well, it depends what you want. If you have a bone stock engine and want just a cam, you can be fine with what TA is offering. The TA25 must be their best selling cam for a Nailhead (used it on my build, idled fine, started right up). To my knowledge, on a bone stock engine a minor change in duration won't be noticeable at all. Bullet cams might offer you something special, if you ask them. Harold from Ultra Dyne had designed some weird profiles - heavily assymetric - with fast lift ramp with smooth deceleration ramp for flat lifters. Those are famous for being different from the most of the cams. But as long as you want a daily driver, not a drag strip screamer, I'm not sure you really need thaaat special cam.
yes bullet makes some nice cams, have one for my 440 mopar have it running in 2 more months. anybody have a vacuum reading at idle with the ta-25 cam?
Here's the deal guys. No, DD is not an end all when it comes to predicting exact horsepower & torque figures/curves. But what it does do is offer a good way to compare different cam grinds, or even a different set of head flow figures to one another. For what it is it's pretty accurate. And frankly, until you get into the territory of big buck OEM dyno simulation software, the margin of error in other dyno programs probably isn't much better. Houmark, the TA25 or any other similar cam grind will suit you well. You can go a little milder, or a hair more aggressive, the choice is yours. But I would strongly suggest having additional duration/lift on the exhaust lobe.
I lay myself flat on the floor... Thank you for all the advises You certainly helped me getting on the right path
Again, just a reminder... When you have decent ported heads it will smooth out the slight roughness to cams compared to with bone-stock castings. It will also extend the power band, esp. the bottom of the range. A tighter lobe center will no longer be a deal-breaker for daily drivers, nor will a slight increase in duration. They will actually work a bit better than the wide centered ones with that one single disadvantage negated. Being no longer a factory grind, the tune up specs can be revised a bit...to the favor of the new combo. Keep in mind that simulation programs without consideration to chamber shape and estimations of mixture motion energy are really only good cylinder filling models. Very effective ones...as long as it's accepted that cfm x cubic inches x rpm does not = power without those calcs. That's why certain engines defy sims or dyno expectations, or fall short. Another thing to keep in mind is that the sims won't give much indications to part throttle manners, esp. when combos vary so much. I do use sims and the other related formulae to plan every aspect of the builds. The sims are good for studying the comparative shapes of the torque curves. That's the best use for it. So, don't be afraid to put some cam in it and ported heads cure many evils.
I follow want youre saying, but the car is driven more en low rpm than high, so I dont want to risk loosing too much low end over more higher in the band.. That being said, I want to gain as much possible over the whole spectra Think I will be looking for a week or two more before I order, just long enough that Im certain in my choise and not being mental about it.. FrenchNailhead > Are you happy about the TA_25? Do you wish you gone higher or lower? The email I got for Bullet Cams dosnt work.. Just got an automatic email back that the email I sent, is trying to be delivered for 2 days more but hasnt arrived yet.. Sent my email 2 days ago.. Houmark
Houmark, I am very satisfied with the ta 25. Also at low revs comfortable than in high RPM. I won 1 second 0 to 100 km / h. I also think that the replacement of the carter carb by a quadrajet 800 cfm to great help! I am very pleased with the performance. The idle sounds "badass" but the operation is very sweet!
ask them about this cam h266/297 with 216@50 with 475 for the intake. h272/295 with 222@50 with 472 lift on exhaust. on a 111 LSA with a 4* built in advance. has lots of duration at 200 lift where it counts. also tell them your heads flow intake 195 CFM at 500 lift, and 120 CFM on exhaust. also tell them stock will not flow past 500 lift.
Its very close to the Schneider 270-80H, which came out best in the Dyno program.. http://schneidercams.com/270-80Hnailheadhydraulic.aspx I wrote Bullet again with your question..
Tight lobe centers and an advanced position significantly help low and mid rpm driveability. Even if the idle is raspy, it will be much more responsive and you won't lose bottom end. The trick is to match or exceed the dynamic compression from the milder, more spread out grind. Wider lobe centers mellow the idle (and torque curve) by starving the engine of important overlap. Slightly overcamming a wider grind absolutely kills torque. You lose nothing doing the same with tighter overlap.
So you want a bigger cam, with smaller LSA? And then install it advanced? http://schneidercams.com/284-88Hnailheadhydraulic-2.aspx
no, you will have a bad idle no vacuum, I think he might to keep the duration down too. your head stop flowing at 500 that cam has 512, you will just move your power band if you have to much duration and not match head flow
Im not sold at the tigther LSA.. The last Bullet Cam you posted, and the Schneider 270-80H is my favorites now.. The are very close, but leaning towards the Schneider because of the higher lift on exhaust side.. Can I see anywhere, if the Scheider has advance built into it, like the 4* on the Bullet you posted? Dont know if the Dyno program take notice of that, but it must have something to say torque wise.. Im still very glad for all the help..
