Search found 1464 matches
- Fri Apr 12, 2024 4:33 pm
- Forum: Engine Tech
- Topic: Fuel flow restriction
- Replies: 6
- Views: 380
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: 998
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: 2068
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: 687
- Tue Feb 20, 2024 10:05 am
- Forum: Engine Tech
- Topic: NHRA STOCK valve job
- Replies: 52
- Views: 6166
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: 883
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: 883
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: 2331
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: 885
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: 885
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: 64573
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: 64573
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: 893734
- Sat Jan 06, 2024 2:44 pm
- Forum: Engine Tech
- Topic: Carb flow testing
- Replies: 14
- Views: 64573
Re: Carb flow testing
When I was doing more carb testing years ago, it was when I had a SF-110 bench, so the actual test pressure was 10”, and was converted to 20.4”. I did a couple of tests at different pressures on the CFS carb today. Tested at 20.4”, then 28”, then 10”. The converted numbers are pretty close to the ac...
- Sat Jan 06, 2024 2:35 pm
- Forum: Engine Tech
- Topic: Carb flow testing
- Replies: 14
- Views: 64573
Re: Carb flow testing
The SF carb testing adapter comes with a 4 hole spacer that has 1.687” bores. I found one that has 1.750” bores that I use for the carbs that use the 1.750” baseplates. I hadn’t done that test in many years, so I did it again today. On the HP950, using the adapter with the 1.687” bores dropped the d...