Lx9 Flow data..

[1988GTU]

Looking to find some info on how much the stock 3500 heads flow intake/exhaust per 1k rpm N/A. Does anyone have those numbers?

1,000rpm=?
2,000rpm=?
3,000rpm=?
4,000rpm=?
5,000rpm=?
6,000rpm=?
7,000rpm=?

[robertisaar]

..... kind of an odd way to measure flow? and wouldn't it be dependant on cam timing among other variables?

[Superdave]

Do you want mathematically derived numbers or actual flow numbers?

Actual could be done but like Robert said it would really depend on the cam, exhaust, porting, ambient air temp, runner temp etc...


You could run a long (like 8') piece of 4" PVC to the throttle body with a pair of pitot tubes in the middle of it. With some programming of an Arduino, a differential pressure sensor, a temp sensor and a MAP sensor you could get those numbers.


That's basically how Pitot flow benches work, and how HVAC guys measure CFM in duct work.

[1988GTU]

I would accept mathematical numbers. Kinda would ballpark me in I guess lol .

Robert, that's just me, very odd character lol

[1988GTU]

Dave,
U happen to have those numbers?

[Superdave]

One would need some fairly advanced sym software. I'd ask Ben and see if he can get that sort of info from his setup.


I can get volumetric efficiency % from DD2K but that's about it.

[1988GTU]

I can get volumetric efficiency % from DD2K but that's about it.

May I ask for that please? Thanks!

[trotterlg]

If you got 100% cylinder fill at 7,000 rpm you would flow 432 Cubic feet per minute. Larry

[ForcedFirebird]

If you got 100% cylinder fill at 7,000 rpm you would flow 432 Cubic feet per minute. Larry

Correct, but you can have over 100% VE

[SappySE107]

Whats DD2K say VE is on a stock 3500 at 7k?

[Superdave]

50% @ 7K
78.1% at 3500 is peak


I'm showing 193HP @ 4500 and a blazing 257 TQ at 3K though

That's a little odd...

[robertisaar]

DD2003 does the same thing for any 60V6 engine i build in it.... stupid amounts of low end torque, but reasonable HP estimates.

[ForcedFirebird]

50% @ 7K
78.1% at 3500 is peak


I'm showing 193HP @ 4500 and a blazing 257 TQ at 3K though

That's a little odd...

Interesting.