My thought is, at 20” of vacuum, the TS is def a player.
Might some other circuits need adjustment after restricting the TS?
I’d say that’s highly probable.
I’d make the TS restriction easily adjustable, and start experimenting.
Search found 1466 matches
- Sat Apr 20, 2024 3:55 pm
- Forum: Engine Tech
- Topic: Rich 3000 rpm cruise
- Replies: 69
- Views: 1372
- Sat Apr 20, 2024 3:08 pm
- Forum: Engine Tech
- Topic: Rich 3000 rpm cruise
- Replies: 69
- Views: 1372
Re: Rich 3000 rpm cruise
Sounds like you’ve tried a fair amount of stuff.
My suggestion at this point would be some transfer slot restrictors on the primary side.
My suggestion at this point would be some transfer slot restrictors on the primary side.
- Fri Apr 12, 2024 4:33 pm
- Forum: Engine Tech
- Topic: Fuel flow restriction
- Replies: 6
- Views: 417
Re: Fuel flow restriction
That’s a way bigger hole than what’s in a QJ needle and seat assy.
- Wed Mar 20, 2024 11:56 am
- Forum: Engine Tech
- Topic: Cam Recomendations for a 383 SBC
- Replies: 15
- Views: 1026
Re: Cam Recomendations for a 383 SBC
My understanding is that cams with “tight” LSA’s(more overlap) can create tuning challenges with EFI.
Just something to consider.
Just something to consider.
- Sat Feb 24, 2024 5:52 pm
- Forum: Engine Tech
- Topic: Howards Hydraulic Flat Tappet Lifters - What In The World?
- Replies: 26
- Views: 2114
Re: Howards Hydraulic Flat Tappet Lifters - What In The World?
Apparently………cost does not seem to be a reliable indicator of quality
- Wed Feb 21, 2024 10:12 am
- Forum: Engine Tech
- Topic: Comp Evolution lifters
- Replies: 10
- Views: 705
- Tue Feb 20, 2024 10:05 am
- Forum: Engine Tech
- Topic: NHRA STOCK valve job
- Replies: 52
- Views: 6226
Re: NHRA STOCK valve job
The way I read it is not the valve seat angle +- 1 degree but the valve angle in relation to the deck. That’s my interpretation as well. The valve seating angles can now be anything you want. I would also consider something like a “bowl cut” done in a seat and guide machine as legal now. It’s just ...
- Sat Feb 10, 2024 4:22 pm
- Forum: Engine Tech
- Topic: Source for Tulip Head Valves
- Replies: 15
- Views: 897
Re: Source for Tulip Head Valves
The Ferrea RA IV valves are not tuliped.
They have a 12* back angle.
Perhaps some other supplier of Poncho RA IV valves are actually tulip shaped.
Or even a couple of used OE pieces.
I woulda had that epoxy all cured and shaped by now if I were looking to do that test.
They have a 12* back angle.
Perhaps some other supplier of Poncho RA IV valves are actually tulip shaped.
Or even a couple of used OE pieces.
I woulda had that epoxy all cured and shaped by now if I were looking to do that test.
- Tue Feb 06, 2024 1:21 pm
- Forum: Engine Tech
- Topic: Source for Tulip Head Valves
- Replies: 15
- Views: 897
Re: Source for Tulip Head Valves
The clay would be fine for a quick test, but if you wanted something sturdier, you could use epoxy or body filler.
Could be shaped in a lathe, or even a drill press.
Could be shaped in a lathe, or even a drill press.
- Fri Jan 26, 2024 3:09 pm
- Forum: Engine Tech
- Topic: Audi s4 5v valve guide r&r
- Replies: 34
- Views: 2347
Re: Audi s4 5v valve guide r&r
The wear limit is .80mm , which seams insane. If that number (.80mm, which is .031”) represents the actual valve stem to bore diameter, then I agree that’s crazy. I just replaced some guides that had close to .020” clearance with .341” diameter stem valves, and they were severely worn. The new guid...
- Sun Jan 21, 2024 3:15 pm
- Forum: Engine Tech
- Topic: Making sense of old flow numbers.
- Replies: 10
- Views: 889
Re: Making sense of old flow numbers.
I think you’ll be hard pressed to find any flow tests on a factory SBC double bump head from the last 20 years, done on modern equipment, where the improvement from the rework @.200 lift is 82%. (Not to mention the 100%+ gain @.100) Taken at face value, his numbers can be compared to his numbers. Tr...
- Sun Jan 21, 2024 2:56 pm
- Forum: Engine Tech
- Topic: Making sense of old flow numbers.
- Replies: 10
- Views: 889
Re: Making sense of old flow numbers.
It’s like a dyno, and honestly you should only be comparing against your own. I agree. Here are numbers from a head tested on two different benches. It’s the same head, same port, same valve, tested on two of the same make & model bench(Saenz S-600). Intake flow(same port, same head): Lift———A—...
- Sat Jan 06, 2024 3:56 pm
- Forum: Engine Tech
- Topic: Carb flow testing
- Replies: 14
- Views: 68189
Re: Carb flow testing
Steve, what you’re looking at(in my pics), thinking it’s a QFT-750……..is actually a bunch of QFT parts attached to a Holley retrofit main body…… https://www.holley.com/products/fuel_systems/carburetor_components/main_body_replacements_and_upgrade/main_body_upgrade/parts/134-300S I originally bought ...
- Sat Jan 06, 2024 3:09 pm
- Forum: Engine Tech
- Topic: Carb flow testing
- Replies: 14
- Views: 68189
Re: Carb flow testing
They appear to be .615”
- Sat Jan 06, 2024 2:46 pm
- Forum: Engine Tech
- Topic: 383 sbc first dyno experience
- Replies: 279
- Views: 937068