Search found 1015 matches
- Fri Apr 26, 2024 6:12 pm
- Forum: Engine Tech
- Topic: Carb Tuning: IAB and Transition
- Replies: 19
- Views: 435
Re: Carb Tuning: IAB and Transition
Right now, I have PJ of 76. The IFR is .029. With IAB of .075, I was too rich in cruise. I put in the IAB of .08, hoping to get on the other side. Idle adjustment screws out 1.75 turns (4). That set up is .95 ish (lambda) at idle. Then, slowly going from .95 ish (1200 rpm) to .80 ish (2000 rpm) as ...
- Thu Apr 25, 2024 10:14 pm
- Forum: Engine Tech
- Topic: Rich 3000 rpm cruise
- Replies: 72
- Views: 1495
- Thu Apr 25, 2024 7:25 pm
- Forum: Engine Tech
- Topic: Rich 3000 rpm cruise
- Replies: 72
- Views: 1495
Re: Rich 3000 rpm cruise
So maybe do something radical that will have an impact like blocking some emulsion. This isn't to cure or solve the rich @ 3000rpm problem but create a cause and effect and gather new information and data that may well point you in the direction of the solution. This is why I like the fully adjustab...
- Thu Apr 25, 2024 6:06 pm
- Forum: Engine Tech
- Topic: Carb Tuning: IAB and Transition
- Replies: 19
- Views: 435
Re: Carb Tuning: IAB and Transition
IFR is the how much the fuel supply tap is open - quantity. IAB regulates how much the engines vacuum can, for want of a better term grab the idle well fuel and pull it through. Big iab and the engine vacuum can’t grab as strong so therefore as long (loses its grip) as when the iab is smaller. Stayi...
- Wed Apr 24, 2024 6:54 pm
- Forum: Engine Tech
- Topic: Port Energy Anomoly?
- Replies: 44
- Views: 2013
Re: Port Energy Anomoly?
With a big dose of hubris and ego to go with it!Eroy wrote: ↑Wed Apr 24, 2024 12:00 pmIts the ongoing quest for relevancy that drives it!hoffman900 wrote: ↑Wed Apr 24, 2024 11:33 am I don’t know how anyone can look at that graph and think “this is a good test, let me put it on Youtube”.
- Tue Apr 23, 2024 3:25 pm
- Forum: Engine Tech
- Topic: Port Energy Anomoly?
- Replies: 44
- Views: 2013
Re: Port Energy Anomoly?
Richard Holdener doesn't have an opinion, he has a dyno. The 2.165/1.590-inch valve combo in this lsa test also responded favourably power wise to a 108* lsa https://www.motortrend.com/how-to/1506-lobe-separation-angle-explained-and-how-it-affects-horsepower/ It’s a wide open throttle dyno test fro...
- Tue Apr 23, 2024 6:17 am
- Forum: Engine Tech
- Topic: Port Energy Anomoly?
- Replies: 44
- Views: 2013
Re: Port Energy Anomoly?
Richard Holdener doesn't have an opinion, he has a dyno. The 2.165/1.590-inch valve combo in this lsa test also responded favourably power wise to a 108* lsa
https://www.motortrend.com/how-to/1506- ... orsepower/
https://www.motortrend.com/how-to/1506- ... orsepower/
- Tue Apr 23, 2024 4:20 am
- Forum: Engine Tech
- Topic: Port Energy Anomoly?
- Replies: 44
- Views: 2013
Re: Port Energy Anomoly?
Unity video ties it together. 416ci Cam is NLA BTR 239/254 .631/.610 114+3 They cut the AFR heads to 62cc, don't know if they were flowed before or after. 72cc from AFR ? Wrong heads for that motor anyways. https://youtu.be/TJS8PNPWnDA Would have been good if pre dyno he said “DV thinks with the sm...
- Mon Apr 22, 2024 10:46 pm
- Forum: Engine Tech
- Topic: Port Energy Anomoly?
- Replies: 44
- Views: 2013
Re: Port Energy Anomoly?
You cannot do test like this using a chassis dyno. It’s very hard to control engine temp, oil temp, trans temp, rear end test, and tire temp. All of these can make up the difference. The engine dyno is easier to control things. I've seen 20hp disappear from strapping the car down harder to get more...
- Mon Apr 22, 2024 10:27 pm
- Forum: Engine Tech
- Topic: Port Energy Anomoly?
- Replies: 44
- Views: 2013
Re: Port Energy Anomoly?
No but the AFR has a smaller intake. But by his measures the head with the smaller intake valve has the potential to move more air. And it did at lower engine speeds. I wonder whether it's the old flow bench doesn't pull as hard as a high revving engine causing the discrepency. I hear what your say...
- Mon Apr 22, 2024 10:16 pm
- Forum: Engine Tech
- Topic: Port Energy Anomoly?
- Replies: 44
- Views: 2013
- Mon Apr 22, 2024 9:08 pm
- Forum: Engine Tech
- Topic: Port Energy Anomoly?
- Replies: 44
- Views: 2013
Re: Port Energy Anomoly?
Standard cam for DV's? Then it's all about curtain area. Both the ports are probably too big for a small cam. Big ports don't need big cams. DV showed us nothing again. No but the AFR has a smaller intake. But by his measures the head with the smaller intake valve has the potential to move more air.
- Mon Apr 22, 2024 7:24 pm
- Forum: Engine Tech
- Topic: Port Energy Anomoly?
- Replies: 44
- Views: 2013
Re: Port Energy Anomoly?
Video 1 neither head is backing up in flow.
- Mon Apr 22, 2024 7:15 am
- Forum: Engine Tech
- Topic: Port Energy Anomoly?
- Replies: 44
- Views: 2013
Re: Port Energy Anomoly?
Dyno test shows "better" heads made less power head test data https://www.youtube.com/watch?v=apRpXZ9_DHc&ab_channel=DavidVizard dyno sheet and explanation https://www.youtube.com/watch?v=oJ84JkjpEj0&t=607s&ab_channel=DavidVizard the claims made are that the cam LSA was more o...
- Sun Apr 21, 2024 4:31 am
- Forum: Engine Tech
- Topic: 401 sbc ready for the Dyno
- Replies: 141
- Views: 7291