Cheapish 8cyl p pump

[oregon96psd]

It's what should have been on them from the factory, instead of the mickey mouse stanadyne. A real injection pump, oil lubricated, aneroid, plunger for every cylinder, last the life of the engine.

 

[Thewespaul]

It would have been nice, but from a manufacturing standpoint the db2 size wise fit better on the idi, it made plenty of fuel for the desired power, it’s cheaper to produce than an in-line pump and it will get better mileage with its hydraulic and mechanical timing curve, where the inline pump has locked timing.

 

[nelstomlinson]

Yep, it’s a big pump.

That thing is big enough to pass for a pony motor!

 

[david85]

Yes, but fuel burning is just fuel burning. Air flow is what makes power, and these engines outflow most modern diesels.

Can you maybe unpack that a little? Don't get me wrong, I'd love to believe it were true...but.

I'm trying to picture how a 4V/cyl Direct injected diesel can flow worse than our 2V/cyl IDI engines.

 

[Thewespaul]

7.3 IDI:
Intake

.100" - 69cfm
.200" - 128cfm
.300" - 175cfm
.400" - 184cfm
.500" - 187cfm

Exhaust

.100" - 45cfm
.200" - 82cfm
.300" - 119cfm
.400" - 147cfm
.500" - 163cfm



6.0 psd:

Intake port

.000 Lift 0 CFM
.050 Lift 41.4 CFM
.100 Lift 80.4 CFM
.150 Lift 119.9 CFM
.200 Lift 145.4 CFM
.250 Lift 152.0 CFM
.300 Lift 154.8 CFM
.350 Lift 157.4 CFM
.400 Lift 159.3 CFM
.450 Lift 161.0 CFM
.500 Lift 161.9 CFM
.550 Lift 163.0 CFM
.600 Lift ----------

Exhaust Port

.000 Lift 0 CFM
.050 Lift 37.0 CFM
.100 Lift 69.9 CFM
.150 Lift 93.2 CFM
.200 Lift 106.1 CFM
.250 Lift 111.2 CFM
.300 Lift 116.8 CFM
.350 Lift 119.2 CFM
.400 Lift 120.7 CFM
.450 Lift 121.3 CFM
.500 Lift 121.9 CFM
.550 Lift 122.3 CFM
.600 Lift 122.7 CFM

 

[david85]

Gotcha...so if I'm following, the port is the bottleneck in the system.

Seems the 6.0 flows better at stock settings but chokes off at higher valve lift. Is that the idea?

Cam theory was never one of my strong points.

 

[Thewespaul]

Comparing the stock lift of each engines camshaft:

Intake:
IDI 184 vs PSD 159

Exhaust:
IDI 147 vs PSD 120

The idi with even the stock cam outflows the 6.0 by a big margin when talking peak lift flow numbers which is what translates to peak numbers on a dyno. Where the 6.0 outshine the idi is at low lift values, so it will tend to fill the cylinder quicker than the idi, but as far as total volume, it’s in the IDIs favor. The 7.3 psd flows worse than both the 6.0 and idi in all areas.

 

[Oledirtypearl86]

So a idi flows as well as a 6.0 my opinion is to could shed 15 to 20k an still be cheaper than a new 6.7 powerstroke also Wes any clue on driveability with a p pump

 

[Thewespaul]

It flows about 30% better if you average all the readings. We won’t know much about drivability until we get them on the road, but it should be pretty streetable. I think for those who want a 350-450hp tow rig a rotary pump is the better option, which is why I am continuing to push that platform. I still don’t think we have found the limits to what the can put out.

 

[IDIBRONCO]

Can you maybe unpack that a little? Don't get me wrong, I'd love to believe it were true...but.

I'm trying to picture how a 4V/cyl Direct injected diesel can flow worse than our 2V/cyl IDI engines.

Another thing to consider here. About 10 years ago, when I thought I was into "performance diesels", Diesel Power Magazine said that there was a huge debate among the Cummins guys. They couldn't decide whether 4 small valves flowed better or 2 large ones. Me, I didn't really care and still don't. I'm not a Cummins fan. Apparently I'm not much of a fanboy. I'm not badmouthing them, but they just don't do much for me.

 

[david85]

Well, I always wanted to build another 6.9 just to have a spare. Thinking some more about this, the advantage of the 6.0 at light loading is probably a moot point since the IDI naturally makes more low end torque anyway.

 

[Thewespaul]

Yep, the small displacement of the 6.0 they wanted to make as much low end as possible, you can tell just by their choice in turbo.

Funny that y’all mention Cummins, an untouched 12v head flows about 130cfm at peak lift out the intake and exhaust.

 

[IDIBRONCO]

Funny that y’all mention Cummins, an untouched 12v head flows about 130cfm at peak lift out the intake and exhaust.

That's my only experience with the 2v vs. 4v debate. At least with diesels.

 

[Chemgrad]

Hmm maybe I will hold onto the IDIT and find a nice body to put it in. How much will the inline setup set me back?

 

[onetonjohn]

Wes quoted some numbers out of my price range. I'm hoping maybe as time goes on and they get more volume the price will come down under 10k.