Search found 470 matches
- Fri Jan 26, 2024 3:15 pm
- Forum: Engine Tech
- Topic: DIY CNC-Valve seat cutting machine: Air-Cushion vs. Fixed spindle?
- Replies: 14
- Views: 847
Re: DIY CNC-Valve seat cutting machine: Air-Cushion vs. Fixed spindle?
Are you telling me how to do it? Lol Why can the spindle designed to tilt 5 degrees if it has no purpose hot shot? Original question is a DIY seat cutting machine. I'm not telling you to do anything. Building a rotating spindle, or air float spindle for a DIY is bringing in complications that aren'...
- Thu Jan 25, 2024 11:55 pm
- Forum: Engine Tech
- Topic: DIY CNC-Valve seat cutting machine: Air-Cushion vs. Fixed spindle?
- Replies: 14
- Views: 847
Re: DIY CNC-Valve seat cutting machine: Air-Cushion vs. Fixed spindle?
The serdi ball-joint mounted spindle is a lot easier if doing canted valve heads. Guides only need to be within a degree or two of vertical, not perfectly vertical. Will you be doing heads with canted valves? If your spindle is always perfectly fixed vertical then that means you need to get each gu...
- Thu Jan 25, 2024 5:35 pm
- Forum: Engine Tech
- Topic: DIY CNC-Valve seat cutting machine: Air-Cushion vs. Fixed spindle?
- Replies: 14
- Views: 847
Re: DIY CNC-Valve seat cutting machine: Air-Cushion vs. Fixed spindle?
Fixed spindle, your design. Use an old air float table. I've built cnc machines too. Anything can be done with time and money. Sometimes it's not cheaper to do it yourself. I've cut seats on a bridgeport for years. It cuts a decent seat.... but it takes way too long... and yes I've built fixtures to...
- Thu Jan 25, 2024 10:52 am
- Forum: Engine Tech
- Topic: DIY CNC-Valve seat cutting machine: Air-Cushion vs. Fixed spindle?
- Replies: 14
- Views: 847
Re: DIY CNC-Valve seat cutting machine: Air-Cushion vs. Fixed spindle?
You will need air float table. Indexing each seat by indicating takes way too long.
Look for an old seat and guide machine with air table and use that for your base
Look for an old seat and guide machine with air table and use that for your base
- Sat Nov 11, 2023 12:54 pm
- Forum: Engine Tech
- Topic: Accu finish tool sharpener
- Replies: 0
- Views: 254
Accu finish tool sharpener
I have a Accu-finish carbide sharpener.
Uses 5" flat disk carbide wheel. I believe it's rebranded by Goodson.
Looking for cheaper alternative disks, and what grit is recommended? I believe it's fine on there now... It seems like it should be coarser
Uses 5" flat disk carbide wheel. I believe it's rebranded by Goodson.
Looking for cheaper alternative disks, and what grit is recommended? I believe it's fine on there now... It seems like it should be coarser
- Fri Sep 15, 2023 8:03 pm
- Forum: Engine Tech
- Topic: Math Problem
- Replies: 46
- Views: 9345
Re: Math Problem
Without doing the math on this particular problem, I have done the math on a valves force in a running engine.
Rough guess, at 7000 RPM , the uneven forces your piston is seeing due to the weight asymmetry is probably around 400lbs difference heavy to light side
Rough guess, at 7000 RPM , the uneven forces your piston is seeing due to the weight asymmetry is probably around 400lbs difference heavy to light side
- Mon Jul 17, 2023 12:05 pm
- Forum: Engine Tech
- Topic: Two stroke piston modification
- Replies: 1
- Views: 411
Re: Two stroke piston modification
Drill hole straight down through ring land. Use a piece of music wire, then punch hole closed on top
- Fri Jul 07, 2023 1:01 pm
- Forum: Engine Tech
- Topic: Checking Ti valves/rods
- Replies: 7
- Views: 584
Re: Checking Ti valves/rods
Ti parts have a fatigue life. After X amount of hours you don't trust.
- Tue Jun 13, 2023 12:13 am
- Forum: Engine Tech
- Topic: CFD/CAD/Thread
- Replies: 266
- Views: 32720
Re: CFD/CAD/Thread
I looked at Converge... I didn't understand what they meant for a trial? 500,000 meshes and under will be unlimited free forever? Large files are pay as you go ?
- Mon May 29, 2023 9:33 pm
- Forum: Engine Tech
- Topic: CFD/CAD/Thread
- Replies: 266
- Views: 32720
Re: CFD/CAD/Thread
I had an interesting discussion with a CFD engineer. His career was mostly involved with simulation of fuel motion and burning as it relates to fuel efficiency, emissions and durability mostly. Detroit passenger cars and trucks, some high performance OEM stuff but not purpose built racing engines. ...
- Mon May 29, 2023 8:34 pm
- Forum: Engine Tech
- Topic: CFD/CAD/Thread
- Replies: 266
- Views: 32720
Re: CFD/CAD/Thread
I had an interesting discussion with a CFD engineer. His career was mostly involved with simulation of fuel motion and burning as it relates to fuel efficiency, emissions and durability mostly. Detroit passenger cars and trucks, some high performance OEM stuff but not purpose built racing engines. ...
- Fri Mar 24, 2023 8:12 pm
- Forum: Engine Tech
- Topic: A different look at in cylinder airflow
- Replies: 11
- Views: 1149
Re: A different look at in cylinder airflow
Use a propane torch. Look at flame. Way easier.
- Sat Mar 18, 2023 3:06 am
- Forum: Engine Tech
- Topic: Simple chamber mod that can get overlooked
- Replies: 39
- Views: 3277
Re: Simple chamber mod that can get overlooked
Doesn't Vizard say not to touch the area modified in video?
- Sun Dec 11, 2022 2:14 pm
- Forum: Engine Tech
- Topic: Does quench affect power?
- Replies: 318
- Views: 25755
- Wed Sep 21, 2022 1:37 pm
- Forum: Engine Tech
- Topic: Valve springs dimensions cross reference
- Replies: 10
- Views: 1029
Re: Valve springs dimensions cross reference
OD .816"
ID .568"
OAL 1.807"
WIRE DIA .122"
105lbs @ 1.04"
Just looking for 10 to 15lbs more across the range. If new spring was 115 to 120 @ 1.04" that would be fine.
It's a diesel turbo application that will see a lot of miles.
ID .568"
OAL 1.807"
WIRE DIA .122"
105lbs @ 1.04"
Just looking for 10 to 15lbs more across the range. If new spring was 115 to 120 @ 1.04" that would be fine.
It's a diesel turbo application that will see a lot of miles.