Is this cam a stupid idea?

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macdrew77

macdrew77

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Piecing together a carbed 5.9 magnum build with EQ heads going to cut for 2.02 valves and do a little porting. Hoping to use stock crank and rods.
I got this cam second hand for cheap and wondering if its a bad choice.
ERSON E994001
Grind RH 294/365
RH 302/365
110 Lobe separation 78 Overlap
Intake opens 37 closes 77
Exhaust opens 41 closes 81
Lift (1.5) 0.547 0.547
Duration @.050 246/252
Spring 130 closed 310-320 open
Ran the wallace DCR calculator and at 10.5:1 static it spits out 7.50 dynamic, which seems pretty soft. Is this cam a stupid idea? Finally got some money to dump into my Dart and looking for a nasty pump gas street strip motor, backed by either 3.09 low 4spd or a 46rh.
 
If you have magnum heads, your rocker arms will give you 1.6, not 1.5 as mentioned with that cam. Do a clay check.
 
7.5 is not awful for a street-strip engine IMHO... it could be a bit better but not much. Since you'll wanna rev this on the strip, I'd pick high RPM breathing over lower RPM torque.... not the same choice I would make for a straight street car. You'll probably use a higher stall any way with the auto.

Question: what pistons are you using? Getting that 10.5 SCR is dependent on those, and stock ones won't get you there without a fair amount of decking of the block.
 
I recommend 228-236 @ .050 ,on the intake lobe ,if running 4:10 -4:30 gears ,and a deep 3200- 3500 tight 9 inch converter .You want big camshaft, make it work correctly.
 
Abodybomber said:
Too big ,in my opine....
Click to expand...

My stock stroke 360( 10.3 ish compression) has a 260/264 565/565 lift cam on a 106 in at 102.
Stock rods, crank and pistons. At 3300 pounds its already been 11.20’s at 118+ with 1.54 60 foot.
Airgap intake, 1 5/8 headers into muffs
Seems to do alright
 
macdrew77 said:
Piecing together a carbed 5.9 magnum build with EQ heads going to cut for 2.02 valves and do a little porting. Hoping to use stock crank and rods.
I got this cam second hand for cheap and wondering if its a bad choice.
ERSON E994001
Grind RH 294/365
RH 302/365
110 Lobe separation 78 Overlap
Intake opens 37 closes 77
Exhaust opens 41 closes 81
Lift (1.5) 0.547 0.547
Duration @.050 246/252
Spring 130 closed 310-320 open
Ran the wallace DCR calculator and at 10.5:1 static it spits out 7.50 dynamic, which seems pretty soft. Is this cam a stupid idea? Finally got some money to dump into my Dart and looking for a nasty pump gas street strip motor, backed by either 3.09 low 4spd or a 46rh.
Click to expand...
I think something is off, I can't get to 78* overlap with your numbers. and how the heck you came up with 7.5Dcr at 3100 ft is beyond me. Hang on I got the 78*; 294/302/110 And I see how you could get 7.5, with an ICA of 69*(in at 102) and Scr of 9.8.....
What you didn't mention is the 135psi cylinder pressure, yeah I can see that working with the 3.09 low and 3.91s or better; 3.09x3.91=12.08...
Isn't that what YR runs; 2.66x4.56 =12.13 starter, and he loves it. But I don't recall his tire size. So by itself 12.13/12.08 isn't all that helpful.
But the problem comes, in street mode, when you hit second gear; cuz it's still 1.92 ratio, and your Rs drop to 62%, and with just 135psi...... well, you get the picture.
For the track,I would build the engine to plan on safely buzzing first gear a lil past "normal", and into "wasted space",lol, cuz if you short shift second and find yourself down at 3600, well you are gonna feel that 135psi as a big fat soft spot. The other two shifts are better at .729 and .714
 
Last edited:
B3422w5 said:
My stock stroke 360( 10.3 ish compression) has a 260/264 565/565 lift cam on a 106 in at 102.
Stock rods, crank and pistons. At 3300 pounds its already been 11.20’s at 118+ with 1.54 60 foot.
Airgap intake, 1 5/8 headers into muffs
Seems to do alright
Click to expand...
Sounds awesome, If it's mechanical flat tappet...
 
B3422w5 said:
My stock stroke 360( 10.3 ish compression) has a 260/264 565/565 lift cam on a 106 in at 102.
Stock rods, crank and pistons. At 3300 pounds its already been 11.20’s at 118+ with 1.54 60 foot.
Airgap intake, 1 5/8 headers into muffs
Seems to do alright
Click to expand...
Hydraulic roller?
 
B3422w5 said:
My stock stroke 360( 10.3 ish compression) has a 260/264 565/565 lift cam on a 106 in at 102.
Stock rods, crank and pistons. At 3300 pounds its already been 11.20’s at 118+ with 1.54 60 foot.
Airgap intake, 1 5/8 headers into muffs
Seems to do alright
Click to expand...

Very impressive, this is a 5.9 or LA? How did you get the compression so high?
 
AJ/FormS said:
I think something is off, I can't get to 78* overlap with your numbers. and how the heck you came up with 7.5Dcr at 3100 ft is beyond me. Hang on I got the 78*; 294/302/110 And I see how you got 7.5, with an Scr of 9.8.....
What you didn't mention is the 135psi cylinder pressure, yeah I can see that working with the 3.09 low and 3.91s or better.
Click to expand...
Ran the calculation at 300 ft. The cam specs could be off, they were on a piece of paper i got with the cam, cannot find any info on this particular one online
 
nm9stheham said:
7.5 is not awful for a street-strip engine IMHO... it could be a bit better but not much. Since you'll wanna rev this on the strip, I'd pick high RPM breathing over lower RPM torque.... not the same choice I would make for a straight street car. You'll probably use a higher stall any way with the auto.

Question: what pistons are you using? Getting that 10.5 SCR is dependent on those, and stock ones won't get you there without a fair amount of decking of the block.
Click to expand...
Undecided on pistons. Originally was going to use entire stock shortblock but I have the budget for new pistons. Anyone know of aftermarket pistons that match the weight of stock piece?
 
And KB107's piston+pin weights are only 8 grams heavier than the IC741's mentioned in the article above, so are another option. I assume the assertion that the IC741 piston+pin weight is the same as stock is true, as mentioned in the article. (I always have trouble finding info on stock 5.9L Magnum piston+pin weights....I'm gonna have to write it down someday.)
 
nm9stheham said:
And KB107's piston+pin weights are only 8 grams heavier than the IC741's mentioned in the article above, so are another option. I assume the assertion that the IC741 piston+pin weight is the same as stock is true, as mentioned in the article. (I always have trouble finding info on stock 5.9L Magnum piston+pin weights....I'm gonna have to write it down someday.)
Click to expand...
Verrry interesting. They're a hell of a lot cheaper than the Icons... Maybe a few grams could be shaved off even?
Just read a post on here where a guy measured stock bore 5.9 piston weighed 469 grams, pin was 135 grams, and ring set was 39 grams.
 
macdrew77 said:
Piecing together a carbed 5.9 magnum build with EQ heads going to cut for 2.02 valves and do a little porting. Hoping to use stock crank and rods.
I got this cam second hand for cheap and wondering if its a bad choice.
ERSON E994001
Grind RH 294/365
RH 302/365
110 Lobe separation 78 Overlap
Intake opens 37 closes 77
Exhaust opens 41 closes 81
Lift (1.5) 0.547 0.547
Duration @.050 246/252
Spring 130 closed 310-320 open
Ran the wallace DCR calculator and at 10.5:1 static it spits out 7.50 dynamic, which seems pretty soft. Is this cam a stupid idea? Finally got some money to dump into my Dart and looking for a nasty pump gas street strip motor, backed by either 3.09 low 4spd or a 46rh.
Click to expand...
The way I see it is ether use a smaller cam or go to another point of compression and use some race gas. (Or aluminum heads)
 
Ive got a stock bottom end 5.9 mag with ported factory heads, had the stock cam reground to 242/248@.050 .550/.550 w/ 1.5 rockers, on a 110 lsa. Sounded great, pulled like a freight train, and was pretty well mannered for street driving. The converter and tuning plays a big part in the streetability factor.
 
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