Turbulent choke? Part 22:15-25:38
How that appears in the power curve?
-juhana
Search found 675 matches
- Sun Apr 28, 2024 3:03 am
- Forum: Engine Tech
- Topic: Port Energy Anomoly?
- Replies: 60
- Views: 2739
- Thu Apr 25, 2024 3:11 pm
- Forum: Engine Tech
- Topic: Work in progress: A460 Ford CNC porting project
- Replies: 67
- Views: 19334
Re: Work in progress: A460 Ford CNC porting project
Isn't that a misleading saying? As the port size increases for a given bore size, there is less and less space left for the valve and flow entering the chamber..
-juhana
- Wed Apr 24, 2024 11:16 am
- Forum: Engine Tech
- Topic: Port Energy Anomoly?
- Replies: 60
- Views: 2739
Re: Port Energy Anomoly?
Based on the flow curve and cross sectional areas, im not convinced the heads fit the engine well.
WAG; Maybe the air flows through the valve throat in such a way that it blocks the flow zone, reduces the available area and chokes the engine?
-juhana
WAG; Maybe the air flows through the valve throat in such a way that it blocks the flow zone, reduces the available area and chokes the engine?
-juhana
- Wed Apr 24, 2024 9:02 am
- Forum: Engine Tech
- Topic: Port Energy Anomoly?
- Replies: 60
- Views: 2739
Re: Port Energy Anomoly?
I copied the test data of both heads from the video and made a comparison. Here is a port energy density comparison between ported ls3 (as i remember it) and AFR ls3 head;
-juhana
-juhana
- Mon Apr 22, 2024 8:48 am
- Forum: Engine Tech
- Topic: Port Energy Anomoly?
- Replies: 60
- Views: 2739
Re: Port Energy Anomoly?
Observations from a hobbyists point of view; The flow curve shows possible intake port stability/air speed problems at higher lifts, where the port energy also drops like a tail. Heres one head im working on that i expect will help the car out of corners and also have good top speed. (igonore the ex...
- Thu Apr 18, 2024 1:27 pm
- Forum: Engine Tech
- Topic: Ported Chevy 083 heads, the tpi project
- Replies: 398
- Views: 41349
Re: Ported Chevy 083 heads, the tpi project
Long duration cams will do the same as shortening the runners. But, as it is said in 2 stroke tuning, pipe the port, don´t port the pipe. The runner CSA must be calculated for the engine size and max hp RPM you are planning. Then you must decide reflection and TPI will be the second reflection. Act...
- Sat Jan 13, 2024 3:33 am
- Forum: Engine Tech
- Topic: How much swirl is too much swirl
- Replies: 75
- Views: 290448
Re: How much swirl is too much swirl
I would say that widening the ssr is a common move, but i was wondering if that would add to the thumble?
Does anyone have experience measuring tumble with this type of floor shape? Thanks,
-juhana
Does anyone have experience measuring tumble with this type of floor shape? Thanks,
-juhana
- Mon Jan 08, 2024 10:01 am
- Forum: Engine Tech
- Topic: Throat percentage
- Replies: 24
- Views: 101100
Re: Throat percentage
Because no one wants to admit that they use more than 92% valve to throat percentage on intake.. Type 1 vw head paired with a dual port manifold work in progress.. Screenshot_2023-12-29-21-56-52-74_92460851df6f172a4592fca41cc2d2e6.jpg IMG20231229163806.jpg -juhana I have recieved something like tha...
- Sun Jan 07, 2024 5:06 am
- Forum: Engine Tech
- Topic: Throat percentage
- Replies: 24
- Views: 101100
Re: Throat percentage
My problem, I think it's on a more delicate area, and probably there's nothing that can be done to improve it, the ducts are pretty much stock, but the previous owner enlarged the throat area in the seat, so the seat is like straight and then 45 degrees, the seat is flush to the throat, straight, I...
- Sat Jan 06, 2024 11:37 am
- Forum: Engine Tech
- Topic: Throat percentage
- Replies: 24
- Views: 101100
Re: Throat percentage
Why isn’t anyone looking at runner to throat percentage Because no one wants to admit that they use more than 92% valve to throat percentage on intake.. Type 1 vw head paired with a dual port manifold work in progress.. Screenshot_2023-12-29-21-56-52-74_92460851df6f172a4592fca41cc2d2e6.jpg IMG20231...
- Fri Jan 05, 2024 8:29 am
- Forum: Engine Tech
- Topic: What SBF head is this? 289hipo/302/hi-port iron hybrid
- Replies: 21
- Views: 53065
Re: What SBF head is this? 289hipo/302/hi-port iron hybrid
Thanks for the answers. I picked up the heads today and they look like this;
-juhana
-juhana
- Mon Jan 01, 2024 12:43 pm
- Forum: Engine Tech
- Topic: Throat percentage
- Replies: 24
- Views: 101100
Re: Throat percentage
Why isn’t anyone looking at runner to throat percentage Because no one wants to admit that they use more than 92% valve to throat percentage on intake.. Type 1 vw head paired with a dual port manifold work in progress.. Screenshot_2023-12-29-21-56-52-74_92460851df6f172a4592fca41cc2d2e6.jpg IMG20231...
- Fri Dec 29, 2023 1:13 pm
- Forum: Engine Tech
- Topic: Intake Manifold Porting Show ‘n Tell
- Replies: 760
- Views: 852565
Re: Intake Manifold Porting Show ‘n Tell
Here a lower package is in the fitting. The manifold needs work and maybe a spacer, its just been cleaned.
-juhana
-juhana
- Thu Dec 28, 2023 8:55 am
- Forum: Engine Tech
- Topic: What SBF head is this? 289hipo/302/hi-port iron hybrid
- Replies: 21
- Views: 53065
Re: What SBF head is this? 289hipo/302/hi-port iron hybrid
I have one pair on shipping that i picked up online. The seller said they were off the -68 mustang. I see markings 302 and V2 in the picture and possible cast in recessed spring pockets? Screenshot_2023-12-28-15-30-34-02_6012fa4d4ddec268fc5c7112cbb265e7.jpg I can of course take more pictures when th...
- Wed Dec 27, 2023 10:11 am
- Forum: Engine Tech
- Topic: Chevy 193 Swirl port Mission Impossible
- Replies: 88
- Views: 249398
Re: Chevy 193 Swirl port Mission Impossible
I have sprayed more fluid when i didnt believe the results of it keeping suspended with the airflow
My shop vac has two filters, i last used it yesterday and it hasnt exploded yet.
-juhana
My shop vac has two filters, i last used it yesterday and it hasnt exploded yet.
-juhana