Refined Cam Sim comparisons

[ruffy01]

I refined my methods a little & updated head flow spec's with SilverXJ's recommendation.
With each sim' run SCR was altered (cam specific) to achieve a DCR ~8.3:1.

1st up: Comp cams

COMP CAMS.jpg

2ndly: 505Performance Cams & Comp Cams 239-4

COMP 239 & 505P CAMS.jpg

Interestingly, Comp Cams 239-4 & 505Perf Cams 263-265 14H are almost identical with this sim.
From a user POV the 505 cam could be run with stock valve springs (0.427/0.438 Lift) Vs the 239-4 (0.493/0.512 Lift) which definitely needs aftermarket.
The other spec's on these two are:
263/265: IVC=65.5*, LSA=114*, Overlap=36*
239-4: IVC=58.0*,LSA=111*, Overlap=44*
So a higher SCR with the 263/265 cam's late IVC also.

The 505Perf 272/280 14H sacrifices a little low down torque but catches very quickly with a very flat early curve. Nice HP too.

[CobraMarty]

The gains are mostly between 4000-5000rpm. How often are you in that rpm range? If you have an auto that shifts at 4800-4850rpm, whats the point?

[FlyinRyan]

I would avoid ANYTHING from 505.....

[SilverXJ]

You would get a better view if your limit the plot RPM to 5000. Enter ALL the data for the camshaft, seat to seat and .050" numbers. Then compare between the two. This will also help DD calculate the ramp rates

[BDD]

I would avoid ANYTHING from 505.....

Care to elaborate?
I havn't been on the site for awhile. I have used 505 and had nothing but great service and six cylinders that beat up v8s. Am I missing something?

I am really interested to hear what you have to say as I was concidering your tuning services. Thanks

[ruffy01]

The gains are mostly between 4000-5000rpm. How often are you in that rpm range? If you have an auto that shifts at 4800-4850rpm, whats the point?

It was simply a 'have a look & see' exercise Marty
No good for my needs.

[ruffy01]

You would get a better view if your limit the plot RPM to 5000. Enter ALL the data for the camshaft, seat to seat and .050" numbers. Then compare between the two. This will also help DD calculate the ramp rates

Thanks Silver, I did enter all the .050" data but it disappears after saving, not on all cams though
I shall narrow down the RPM range.

[ruffy01]

I would avoid ANYTHING from 505.....

As BDD asked, I'm also curious.
I've read negatives about their rollers but not their other profiles.
I'm still checking out other cams but I quite like 505's 263/265-14H vs Comp's 239-4:

239-4 vs 263-265.jpg

They appear almost identical (according to the Sim' of course, real world may be different)
I could run factory valve springs with the 505 cam but not Comp's 239-4.

[SilverXJ]

Search on here for 505 issues. Bad service, bad packaging, failures, etc.

As for DD not saving both the seat to seat and .050 figures I ran into that problem as well. I believe something else changes in the cam manager that has to match when you do the other figures. I can't recall exactly though.

[ruffy01]

Search on here for 505 issues. Bad service, bad packaging, failures, etc.

As for DD not saving both the seat to seat and .050 figures I ran into that problem as well. I believe something else changes in the cam manager that has to match when you do the other figures. I can't recall exactly though.

Thanks mate.
I just re-entered the .050" data, saved, closed & re-opened; gone!
It holds the data as long as the session is open.

I've found a few negatives on 505, damn shame, I do like their profiles.
I'll look a bit closer at Erson, Hesco & Crane too.

[scalper]

I would avoid ANYTHING from 505.....

x2