Thread: Sad sad N1 cam dyno results

Did a lot of looking at dyno sheets today. It seems anyone with there cams set at +4-4 and +5-5 make peak power around 7200 rpms and fall off sharply and do not make much peak power but do have good stock like low end grunt. But thats not the point of N1 cams. People who have put them in straight up at 0/0 make and hold good power from 7,000rpms to 8,500 rpms! And have good peak power but less low end power . Thats not to say that is the best position to make best peak or overall power. The more overlap we put on the cams the more narrow the powerband will be and the less top end power we will have but the more low end power we will have.

However I believe that there is a sweet spot and I will find it! motors with +2.5 -2.5 have good results and I believe that is the most overlap needed. I think the sweet spot is between 0/0 and +2.5in -2.5ex. I will dyno 0/0 then +2-2 and If I still dont make good power by then I will try +2/0 and (+3-2 because my CS gears will not do 2.5 increments.)

I will redyno this week. starting at 0/0.

I am confident that the cam timing was my problem after seeing many dyno sheets. I've seen as low as 158hp to 170hp and (181hp mine). All of those were set at either +4-4 or+5-5.

WIth that header, how much timing are you running up top above 6000rpm?

35* It loved the timing. we took it away and it lost power. Then we bumped it up to 35. we started out at 34* then 30* lost power then 35* and gained a lot. between the timing bump and extra fuel it gained 10hp.

The header is alright then? I was going to rebiuld a more refined version in stainless but I wanted to see how it would workout in mild steel first.

if you have a WELL BUILT 25" 1 3/4- 1 7/8" header and everything else is fine, then it should be wanting about 26-28 deg total up top. if you are running more than that, then you have a problem and are not getting enough air into the motor. When you are running that much timing, then you are not filling the cylinders enough and the motor is not as efficient as it should be.

Honestly, that header is probobly too big for your setup. You would probobly gain power everywhere with my budget header

Those other guys had ssac headers with high overlap with their cams and I still made more power than they did. I still feel it was the cam timing. I have yet to see a dyno chart with N1's and high overlap making good power. But I have seen many with low overlap making good power. Maybe I will prove myself wrong when I go back to the dyno. It may be to much timing because the cam timing is also not right

Well remember the header directly impacts how well the motor will take advantage of overlap....

Dudeman

I have seen 3 motors with certain cam settings, all 3 the same, make 205-208whp SAE with similar simple mods. All 3 of these motors were into the 20's for ignition timing up top. all of these made 150wtq SAE as well.

That is correct, and the N1 cams work better with shorter runners than longer, but only with the correct settings.

when I get my headers, I will be playing around with cam timing, and wont have a restrictive exhaust hampering the top end either

What was their cam setting? and what was their midrange timing?