Camshaft possibilities?

Problems with the vw head design I can see, but these idi heads don’t have any major flaws that other platforms have and they flow better than most “race” sbc heads, it’s not boost that makes power it’s air density. You’re still fighting the same restriction with a turbo vs na, but the turbo compresses the air charge to artificially make it denser. That’s what makes power, not the amount of boost being run.

When you put it that way, it sure makes sense to me.

Thewespaul said:

Problems with the vw head design I can see, but these idi heads don’t have any major flaws that other platforms have and they flow better than most “race” sbc heads, it’s not boost that makes power it’s air density. You’re still fighting the same restriction with a turbo vs na, but the turbo compresses the air charge to artificially make it denser. That’s what makes power, not the amount of boost being run.

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Yeah, figured whether the intake is pressurized or not, there is always a pressure differential between the expanding area of the cylinder and the intake. As long as the pressure hasn't equalized, camshaft timing will still affect cylinder fill levels.

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Picked up the Typ4 cam today. Real world results win for me. Thanks Russ. Just happened to live in Portland too!

My truck bogs down on the steep hills and under load at lower rpm. Hate seeing that fuel leave my tailpipe. Need those early upshift.

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IDIoit said:

both are great products!
I put a R&D cam in Asmith's truck, and the powerband was great.
I have a Typ4 cam, and it grunts off the bottom end!

it all boils down to your intended use of the vehicle.

when you ask for a comparison, remember rear gear plays a huge part in peoples opinions.

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I have 4.10s with 35" tires, manual transmission, and always weighing around 10000lbs. Feels like it really doesnt pull until 1700 rpm! Wanting that to come down.

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Hello Russ
I am hearing that your cam is good for torque at lower RPMs. Is it better than the factory IDIT cam?
And, what does it do to EGTs?

Rolf

1989 Ford E 350 Born Free "President" Converted to 4WD
7.3 IDIT (factory turbo engine with Hypermax van kit) - C6 - NP 205 - GV - 3.54
Hypermax van cold air intake kit - WW2
Duralift electric lift pump

Future projects: Factory fuel filter assembly removal / frame rail fuel filter installation to make room for intercooler piping.

Stock cam

Intake Duration: 176*@.050"
Exhaust Duration 184*@.050"
Lobe Sep: 103/105*
Lift: Int .379"/ Exh .379"

R&D Cam

Intake Duration: 178*@.050"
Exhaust Duration 190*@.050"
Lobe Sep: 108*
Lift: Int .410"/ Exh .412"

Typ4
Lift: Int .392"/ Exh .379"

Stock PSD cam

Lift .405 Intake/.405 Exhaust
Duration .004" 237/234
Duration .050 177/185
Duration .200 85/89

I'll do some measurements when I get them cam in to try to fill in those numbers for the typ4.

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Rusgo said:

Feels like it really doesnt pull until 1700 rpm! Wanting that to come down.

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They say that the torque peak is 1500 RPMs give or take. So 1700 would be about right.

Those cam numbers are not valid anymore, I don't use that cam grinding company anymore because of all the problems I had and which there was many posts about people having issues. I don't supply products that have problems so I quit using them as a grinder.
the last few camshafts that I had from them, the lobe lift varied up to .030.
I measured them between centers on the lathe zeroing the dial indicator on the base circle every time.

That is a crappy job no matter how you analyze it. A company I use now .002 maximum variation between lobes.
I have a brand-new IH cam here and it varies up to .005.

I didn't get into the air density discussion because all's people ever interested in is boost numbers.
Here's some numbers for you my truck is intercooled with a 60-1 wheel on an 093 turbo, hauling the camper to the same campsite with the same trailer on in the summer it'll only make 14 or 15 pounds of boost and the EGTS still climb up to 1100 but I have a lot of fuel. In the winter it will hit 19 lb of boost on the exact same hills have lots more power and the egts are only 900.
And yes cold dense air makes one hell of a difference.

Rusgo said:

Stock cam

Intake Duration: 176*@.050"
Exhaust Duration 184*@.050"
Lobe Sep: 103/105*
Lift: Int .379"/ Exh .379"

R&D Cam

Intake Duration: 178*@.050"
Exhaust Duration 190*@.050"
Lobe Sep: 108*
Lift: Int .410"/ Exh .412"

Typ4
Lift: Int .392"/ Exh .379"

Stock PSD cam

Lift .405 Intake/.405 Exhaust
Duration .004" 237/234
Duration .050 177/185
Duration .200 85/89

I'll do some measurements when I get them cam in to try to fill in those numbers for the typ4.

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Click to expand...

Stock cam


R&D Cam

I'm not hip on reading cam profiles so have fun. I guess if there was valve overlap that would equate to dynamic compression loss, which I thought the R&D cam did but it appears not?

0 overlap on both? Not sure if I quite believe that.

Booyah45828 said:

0 overlap on both? Not sure if I quite believe that.

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Unless I'm missing something when inputting the numbers posted above?

Looks like it calculated overlap based on .050" lift values:

typ4 said:

And yes cold dense air makes one hell of a difference.

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Yes it do! Back in my trucking days I had an old 1693 Cat that would pull 22# summer, 34# in cold winter & get there quicker. Same fuel, same hills, same kind of load.
My '90 7.3 w/088 ATS used pull 8-9# summer, 11-12#+ at about -10* deg, same settings, same hills, etc, & get there quicker!!
But one of these days I want to do a cam, soon as I can get round to doing some injectors first...... & get my SHOP BUILT!!!

ttman4 said:

Yes it do! Back in my trucking days I had an old 1693 Cat that would pull 22# summer, 34# in cold winter & get there quicker. Same fuel, same hills, same kind of load.
My '90 7.3 w/088 ATS used pull 8-9# summer, 11-12#+ at about -10* deg, same settings, same hills, etc, & get there quicker!!
But one of these days I want to do a cam, soon as I can get round to doing some injectors first...... & get my SHOP BUILT!!!

Click to expand...

Oh come on you know you want to work on the truck in those central oregon snowy days