Camshaft (2 Viewers)

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Academical value

Just some more info to add value to the thread :

Melling 803 camshaft : ( as per their technical dept )
MC803 duration @.050 int. 189, exh. 189
Valve lift .379int. .379exh.
Lobe centers 112deg. int. 112deg exh.

I use a camshaft data calculator and got the following from it :

Isky 260 grind
Overlap of 50.00 degrees and has in Intake Duration of 260.00 degrees. The Exhaust Duration is 260.00 degrees. The Inlet Cam has an Installed Centerline of 105.00 degrees ATDC. The exhaust cam has an Installed Centerline of 105.00 degrees BTDC.

Isky 258
Overlap of 42.00 degrees and has in Intake Duration of 258.00 degrees. The Exhaust Duration is 258.00 degrees. The Inlet Cam has an Installed Centerline of 108.00 degrees ATDC. The exhaust cam has an Installed Centerline of 108.00 degrees BTDC.

Delta KC859 262
Your 262 has an Overlap of 58.00 degrees and has in Intake Duration of 263.00 degrees. The Exhaust Duration is 276.00 degrees. The Inlet Cam has an Installed Centerline of 107.50 degrees ATDC. The exhaust cam has an Installed Centerline of 104.00 degrees BTDC.

Delta KC 859 250s
Your 250s has an Overlap of 31.00 degrees and has in Intake Duration of 250.00 degrees. The Exhaust Duration is 254.00 degrees. The Inlet Cam has an Installed Centerline of 108.00 degrees ATDC. The exhaust cam has an Installed Centerline of 113.00 degrees BTDC.

2F
Your 2F has an Overlap of 32.00 degrees and has in Intake Duration of 250.00 degrees. The Exhaust Duration is 250.00 degrees. The Inlet Cam has an Installed Centerline of 108.00 degrees ATDC. The exhaust cam has an Installed Centerline of 110.00 degrees BTDC.

3F
Your 3F has an Overlap of 32.00 degrees and has in Intake Duration of 250.00 degrees. The Exhaust Duration is 250.00 degrees. The Inlet Cam has an Installed Centerline of 103.00 degrees ATDC. The exhaust cam has an Installed Centerline of 115.00 degrees BTDC.
 
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Crow cams

I stumbled across another grind out there :
Crow Cams in Australia .

http://www.crowcams.com.au/media/catalogues/42.0 Toyota.pdf

Adv duration 266
duration @0.050 is 208
int 24 - 62
ex 64 - 22
L/C110*
valve lift 0.420
[SIZE=-1]Your crow has an Overlap of 46.00 degrees and has in Intake Duration of 266.00 degrees. The Exhaust Duration is 266.00 degrees. The Inlet Cam has an Installed Centerline of 109.00 degrees ATDC. The exhaust cam has an Installed Centerline of 111.00 degrees BTDC

Their comment : High Torque cam
[/SIZE]
 
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Finally had the 2F with Delta 250s camshaft in the Dyno ( sealevel , gearing 4,56:1 , 33" wheels , H55f gearbox)

KW110 ( 150 Hp ) these figures are at the wheels and not flywheel
280 Nm

You can clearly see where the engine comes in cam at 2400rpm
dyno1010.jpg


I am happy
 
Yspen said:
Lets look at the different options out there :

2F stock
250 duration
Int 17-53
ex 55-15
lift ? 0.377

3F stock
250
INt 22-48
EX 60-10
lift ? 0.377

Isky Z99+E4 grind
258
INT 21-57
ex 57-21
lift 425

Isky z99-005 grind
260
Int 25-55
ex 55-25
lift 406

In another thread the following Delta grind gets mentioned: ( intake similar to 2F and ex similar to 3F , duration slightly longer )
Perf 250 S grind
Duration intake 250
Duration exhaust 254
Intakes opens 17, closes 58
Exhaust opens 60 closes 14
cam rise .255 L/C 108 degrees
Lash intake .014 exhaust .014

KC 859 - MarkW's choice
262
INt 24-59
ex 62-34
lift 440 (?)

I am trying to make sense of these figures . ( the following info taken from other threads )

Lower duration cams produce the power in the lower RPM range. Larger duration cams operate at higher RPM, but you will lose bottom end power to gain top end power as the duration is increased. (For each ten degree change in the duration at .050", the power band moves up or down in RPM range by approximately 500 RPM.)
Advancing the cam will shift the basic RPM range downward.

Too little compression ratio (or too much duration) will cause the cylinder pressure to drop. This will lower the power output of the engine.


So to apply to my situation :
I am raising compression and overbore ( 8.8-9 :1 ) = more power
If I fit the longer duration KC 262 cam , it may counter the higher compression but will also move the powerband up by 500rpm . The same KC grind is advanced in timing and will move the powerband down = back to where I started :doh:

The Isky 258 grind is similar in timing than the 3F but longer duration . So the engine will be very much the same but rev more comfortably at above 2000rpm (?)

Help me make sense of this
Click to expand...

are the above lifts, the amount that the valve moves after the rocker arm ratio is applied OR are they the actual cam lobe lift, upon which the rocker arm ratio needs to be made?

If the former, that sounds better
If the later, then the valves move a long way

would like to know for sure

doug t
 
norsk said:
are the above lifts, the amount that the valve moves after the rocker arm ratio is applied OR are they the actual cam lobe lift, upon which the rocker arm ratio needs to be made?

If the former, that sounds better
If the later, then the valves move a long way

would like to know for sure

doug t
Click to expand...

This would be valve lift, not lobe lift.
 
did anyone do a dyno of the 2FE with the Delta 250 cam?
it would be an interesting comparison to the 2F with Delta 250 cam that has been posted.
 
could use some help. just rebuilt my 62'S 3FE used the Man A Fre RV cam. they were unable to provide specs for it to degree it.

truck is running however its a bit rough at idle and lacks a bit of low speed power.

can i get some comments on what might be wrong. open to any suggestions on what to do next.
 
Not trying to be a smartass, but that sounds like the general outcome of installing a longer duration/higher lift cam.
 
TS888 said:
Not trying to be a smartass, but that sounds like the general outcome of installing a longer duration/higher lift cam.
Click to expand...

x2 Mine lopes at idle and draws less vacuum than the stock cam did.

These cams aren't "degreed", unless you want to put it out a tooth. Have you kept up with adjusting the valves? How's your ignition timing? How much vacuum is it pulling?
 
I just got an all steel cam gear made by ITM part no. 50060 It's going into my 3fe into my dads 60.
 
crushers said:
did anyone do a dyno of the 2FE with the Delta 250 cam?
it would be an interesting comparison to the 2F with Delta 250 cam that has been posted.
Click to expand...

There you go : 2FE with aftermarket ecu added
( ignore the lower lines - it was prior to tuning the ecu )

dyno221012.jpeg
 
I thought I would throw this in here. It is an old thread but I think people still come here for reference.
I just had my 2f camshaft reground by Interior Cam Supply Ltd, Engine Repair & Rebuilding, Salmon Arm, BC. They are a very reputable shop that does top notch work. The price was very fair and they are a local shop. This is a great option for us Canadians.

The cam profile I went with is very similar to the Delta 262 cam grind.
Here are the specs of the cam grind I had done, compared below to the Delta 262 grind.

Interior Cam Supply
Duration @ 0.050: 214
Cam rise: .282
Lobe Separation: 108*

Delta Cam
Duration @ 0.050: Delta, 217
Cam rise: .284
Lobe Separation: 108*

Really, the differences are negligible. Hope this is useful to someone!
 
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What I have noticed is that the difference between advertised duration and duration @0.050 is about 58 degree reduction. Using this trend most follow this path. The outlier seems to be the Delta 250s grind that apparently has a 215? duration at 0.050".

Any insight or correction feedback would be appreciated
 
Since this seems to be the place we put the cam info we find...
I called Delta today about my 3FE's cam and they did _not_ recommend running the 250 or the 262/KC859 cam at my elevation here in Utah. (4500 feet+)
They cited insufficient vacuum, in particular, as a problem for EFI-ed F-series motors when running hotter cams.
A regrind of stock was what they recommended.

HTH someone else looking at this decision.
 
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