Injection pump testing

[KTA]

1st you cut the correct outside diameter of the threads. Then you set the lead screw on the lathe to match the thread pitch. Since my lathe is big and the thread pitch is fine I then determine the proper depth of cut to cut the thread minor diameter. Then you set the minor diamter at the end of the part close the half nuts on the lathe, let it cut the length of thread you need then back the cutting tool out really fast at the end of the cut and simultaneously open the half nuts to keep the table or curtter from crashing into anything. Cutting up next to the chuck like that is always fun! Good thing is you can do this with the lathe turning slow so reaction time isn't real critical. You can also cut internal threads by this smae method, but I find a tap is easier.

[JBradley500]

does someone have a drawing of one of these with dimensions? i can program and make stuff like that on our cnc pretty easily.

[Begle1]

1st you cut the correct outside diameter of the threads. Then you set the lead screw on the lathe to match the thread pitch. Since my lathe is big and the thread pitch is fine I then determine the proper depth of cut to cut the thread minor diameter. Then you set the minor diamter at the end of the part close the half nuts on the lathe, let it cut the length of thread you need then back the cutting tool out really fast at the end of the cut and simultaneously open the half nuts to keep the table or curtter from crashing into anything. Cutting up next to the chuck like that is always fun! Good thing is you can do this with the lathe turning slow so reaction time isn't real critical. You can also cut internal threads by this smae method, but I find a tap is easier.

Aren't they tapered a bit?

[JQmile]

Killer stuff! I'd be sending mine out if I hadn't got it tested already

Mine was 370cc at 2,500rpm and full de-fuel by 3,900rpm, although I am too scared to spin it much past 3,500.

[KTA]

Killer stuff! I'd be sending mine out if I hadn't got it tested already

Mine was 370cc at 2,500rpm and full de-fuel by 3,900rpm, although I am too scared to spin it much past 3,500.

You are talking about your 14mm right?

[JQmile]

Yeah....I've actually been itching to try out a 14mm/4mm to see what it flowed, but I just don't trust the reliability of 'em.

[KTA]

To illustrate the effect injectors have and to show the potential power diffrences I ran the same pump set the same way through my 6x.018" and a set of POD's I have laying around. These are the results
RPM 6x.018 POD
1500 285 210
2000 300 210
2200 302 220
2500 277 180
2600 206 130
3000 45 35
Calculated power based on burning all fuel for each rpm and using typical fuel
1500 335 247
2000 470 330
2200 520 380
2500 542 353
2600 419 265
3000 106 82

It is interesting to note that with the POD's the peak power would be made lower at 2200rpm and 380 engine hp than the 6x.018's that indicate peak power at 2500rpm and 542 engine hp.
So it looks like with this pump tuned in its current state it would probably make about 304 rwhp with the POD's and 433rwhp with the 6x.018's but again this requires you to actualy be able to burn that fuel something easier said than done!

[burnt_servo]

is it possible to get the 6x.018's to burn cleaner than the pods ?

[KTA]

is it possible to get the 6x.018's to burn cleaner than the pods ?

All things being equal I would say no.

[IrishChamp]

Good info!

[BC847]

Very interesting seeing as I'm fixing to build a 12mm VE.

Keep the info coming.

[kensmachine]

KTA how about a picture of your test stand. Ken

[KTA]

I took some pictures of the testing, but since I lost my site that used to host pictures I don't know a good place to put them. Can anyone recommend a good free site that doesn't change over time? I don't like photobucket becuase it seems in 2 or 3 months the pictures no longer link correctly.

[lectro_static]

I took some pictures of the testing, but since I lost my site that used to host pictures I don't know a good place to put them. Can anyone recommend a good free site that doesn't change over time? I don't like photobucket becuase it seems in 2 or 3 months the pictures no longer link correctly.

I use image shack, its free and doesnt seem to change at all, just have to watch the size of the picture or they will be clipped when showing on this site.

[Richie O]

I use photobucket and have no issues with it. I have over a thousand pics there and tons of people view my account. The site is also quicker then it was. It used to take longer to load the site. I'm happy with it. I have never had links go south either.