Originally Posted by Precision

You can be happy with what you have. But my point is, both engines were dynoed in the same trim, both on the same dyno with the same 200 RPM/SEC pulls and the same inertia factor. The differences in any part of the two engines is nominal with the exception of the heads and the cams.

Tim has ARF 325-1 heads and a cam that would better serve as a paperweight.

The other engine has the AFR 300 CNC heads (that Bob says is too small for a 540) and a 651 cam.

The fundimental difference that can bee seen on the plugs and the data from the dyno is the exhaust duration is far too small for Tim's engines and the intake lobe is too drastic. It doesn't take any advantage of the low lift numbers and closes the valve too early killing any velocity that the head could generate if all of the exhaust gas hat actually evacuated the cylinder.

If Tim had a 651 or a cam with maybe 245 on the intake @.050 and 260 @ .050 with mid to low .600 lift he could have come close to 700 with all of the accessories and the wet exhaust.

One fundimental thing to remember in all of this. The salesman is guilty of racing dynos. He has most likely taken the highest number generated by this package and passed it an to his customer disregarding the dyno it was on, the correction factor, or how the engine was dressed.

I could have tricked the dyno into a 700HP number by messing with the air density and pulling the engine from 6000 RPM to 3000RPM but that is making a test to make a number.

Originally Posted by bck

Thanks for providing some detail as to what you think is wrong with the cams. Also don't confuse my getting to the end of my rope with Tim with defense of his cams. 2 different things. As I said people who knowledge is power more than me can fix Tim's engines or not. Not my concern until he shows up and makes it mine

Originally Posted by bck

Thanks for providing some detail as to what you think is wrong with the cams. Also don't confuse my getting to the end of my rope with Tim with defense of his cams. 2 different things. As I said people who know more than me can fix Tim's engines or not. Not my concern until he shows up and makes it mine

Originally Posted by Precision

You can be happy with what you have. But my point is, both engines were dynoed in the same trim, both on the same dyno with the same 200 RPM/SEC pulls and the same inertia factor. The differences in any part of the two engines is nominal with the exception of the heads and the cams.

Tim has ARF 325-1 heads and a cam that would better serve as a paperweight.

The other engine has the AFR 300 CNC heads (that Bob says is too small for a 540) and a 651 cam.

The fundimental difference that can bee seen on the plugs and the data from the dyno is the exhaust duration is far too small for Tim's engines and the intake lobe is too drastic. It doesn't take any advantage of the low lift numbers and closes the valve too early killing any velocity that the head could generate if all of the exhaust gas hat actually evacuated the cylinder.

If Tim had a 651 or a cam with maybe 245 on the intake @.050 and 260 @ .050 with mid to low .600 lift he could have come close to 700 with all of the accessories and the wet exhaust.

One fundimental thing to remember in all of this. The salesman is guilty of racing dynos. He has most likely taken the highest number generated by this package and passed it an to his customer disregarding the dyno it was on, the correction factor, or how the engine was dressed.

I could have tricked the dyno into a 700HP number by messing with the air density and pulling the engine from 6000 RPM to 3000RPM but that is making a test to make a number.

Originally Posted by Precision

No. He is comparing a 540 with the same bottom end , a 651 cam, AFR CNC oval ports and a stock holly 950 carb. Dynoed the SAME WAY on MY SuperFlow 902.

You can see how un happy Tim's engine is by how much air it is wasting. It is using 40 more CFM to make 50 less HP. That is hallmark of the wrong cam and /or a chitty cam design.

Originally Posted by buck35

I guess this what perplexes me the most , the engines were out and on the dyno for two days, why no cam swap to pinpoint the issue? From all that were there it would seem a wide variety of takeouts would be at hand.
J