108 LSA vs 107 LSA
#888474
12/26/10 09:35 AM
12/26/10 09:35 AM
|
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
OP
Too Many Posts
|
OP
Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
|
I'm looking at a hyd. roller cam for a 360 cu in motor with Magnum heads, dual plane rpm intake and a carb.
looking at hughes "whiplash cams for magnum motors w/carbs"
they have one thats .544 lift, 222 degrees at .050, on a 107 LSA
how would this run compared to a similar cam that was custom ground, that's .566 lift, 214 degrees duration, and on a 108 LSA?
what would be the characteristics of each one?
trying to decide if the 2nd custom ground cam would work well for me, compared to the "hughes, custom cam for carb'd magnum" cam.
especially at half the price!
**Photobucket sucks**
|
|
|
Re: 108 LSA vs 107 LSA
[Re: MR_P_BODY]
#888476
12/26/10 10:43 AM
12/26/10 10:43 AM
|
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
OP
Too Many Posts
|
OP
Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
|
Quote:
A shorter LSA has more overlap and has that choppy
idle... both of the cams will be a low rpm cam
ok, i want that chopy lopey idle. with the 1 degree make that much difference in sound?
if you had to choose between the 2 cams, would you take the one with more duration for $365, or the one with less duration for $130?   (keeping in mind a stock truck converter, stall around say, 1800-ish? 4200 lb truck, 3.92 gears with 28" tires0
Pretty sure i've already made up my mind, but i don't want to find myself second guessing my choice, later down the line.
**Photobucket sucks**
|
|
|
Re: 108 LSA vs 107 LSA
[Re: 70Cuda383]
#888477
12/26/10 10:44 AM
12/26/10 10:44 AM
|
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
OP
Too Many Posts
|
OP
Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
|
from my limited understanding, the longer duration cam will be higher in the RPM range, right?
**Photobucket sucks**
|
|
|
Re: 108 LSA vs 107 LSA
[Re: 70Cuda383]
#888478
12/26/10 10:52 AM
12/26/10 10:52 AM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Quote:
from my limited understanding, the longer duration cam will be higher in the RPM range, right?
Yes... I doubt you will see or hear anything with just
1 degree of LSA with all else the same(low LSA has a
higher cranking pressure)
|
|
|
Re: 108 LSA vs 107 LSA
[Re: 70Cuda383]
#888480
12/26/10 04:52 PM
12/26/10 04:52 PM
|
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
Sport440
master
|
master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
|
The Difference in the 8* duration @ .050 will be far greater then the 1* in LSA
But, 1* tighter LSA is on the bigger cam, witch normaly increases overlap.
But, not in this case as the smaller cam installed stright up @ 108* ICL will not open the intake valve untill 1*ATDC The exhaust will close at 1* BTDC So theres a 2* spread from Overlap "EDIT Stated @ .050 dur."
The bigger cam will have 8* overlap vs none of the smaller cam.
At the same spec ICL the 222 will close the intake valve 38* ABDC vs the 214 @ 35* ABDC
Of the two I dont know whitch one Id pick. Probably the smaller one because you said 3900# and towing. The bigger one would would most likely work just fine too mike
Last edited by Sport440; 12/26/10 05:52 PM.
|
|
|
Re: 108 LSA vs 107 LSA
[Re: scratchnfotraction]
#888482
12/26/10 11:55 PM
12/26/10 11:55 PM
|
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
Sport440
master
|
master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
|
Quote:
IIRC stock mag heads dont take much lift over the .450/.465 lift mark
best measure clearance on the valve guide/retainer/seal to make sure you have enuff clearance for that lift range
He's Right, make sure thats addressed before you use either cam. Theres spring seat depth issues too, not being deep enough before coil bind for .450 lift and above.
Im going to guess that by now, 2010/2011, someone has already fixed these issues on your Magnum heads. Better check to be sure if you dont know for sure. mike 
|
|
|
Re: 108 LSA vs 107 LSA
[Re: Sport440]
#888483
12/27/10 12:18 AM
12/27/10 12:18 AM
|
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
OP
Too Many Posts
|
OP
Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
|
I never said towing. I did say truck, but not towing. it's never going to tow, and is a street cruiser. it's just a heavy street cruiser!
as for the lift issues on stock heads, the cam with the 107LSA is from Hughes, and is advertised as "a hyd. roller cam for a magnum engine with a carb instead of EFI" and says that all you need is their springs and retainers, and it will work on an otherwise stock magnum engine...and is infact, designed specifically FOR the stock factory Magnum engine--Head flow, compression ratio, etc.
The other cam is a custom grind Magnum cam, but the guy was using it in a 408 stroker, and his heads were worked.
**Photobucket sucks**
|
|
|
Re: 108 LSA vs 107 LSA
[Re: 70Cuda383]
#888484
12/27/10 01:11 AM
12/27/10 01:11 AM
|
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
Sport440
master
|
master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
|
Well, with that info Id go with the bigger cam 222 @.050 and 107 LSA and the retainer/spring package from Hughes. You wont be able to use the other higher lift cam unless the Magnum heads have been previously machined by somebody else or you for more clearence for .550 lift and above to be safe. From what I hear, the Magnum heads are are definate great upgrade from the older heads for the SB, from the X, J, and the 308 heads. mike
Last edited by Sport440; 12/27/10 01:51 AM.
|
|
|
Re: 108 LSA vs 107 LSA
[Re: Sport440]
#888485
12/27/10 01:29 AM
12/27/10 01:29 AM
|
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
OP
Too Many Posts
|
OP
Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
|
that's kind of how I've been leaning, since the Hughes cam was designed specifically for a stock stroke magnum engine, vs the other one being designed for ported and worked heads, and a stroker 360 at 408cu in.
the factory 5.9L from the trucks is exactly the same as the 300hp crate motor, they just replaced the EFI manifold for a carb manifold, and replaced the distributor, so that right there is a 50 hp jump from the "production" engines.
the 380hp engines were just different pistons for higher compression, and a different camshaft, again, stock magnum heads.
I figured with just a cam change, I'll fall somewhere in between.
...nowhere near as fast as the truck was with a 383 stroked to 438 with eddy heads and a TKO w/ 4.56 gears in the back, but...it should do alright for a street cruiser.
**Photobucket sucks**
|
|
|
Re: 108 LSA vs 107 LSA
[Re: 70Cuda383]
#888486
12/27/10 01:48 AM
12/27/10 01:48 AM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
I think I would go with the 544... 222@50 because I believe either one is short on revs but this one will hang on a bit longer... they both would have lump to the idle
|
|
|
Re: 108 LSA vs 107 LSA
[Re: MR_P_BODY]
#888487
12/27/10 12:38 PM
12/27/10 12:38 PM
|
Joined: Dec 2008
Posts: 1,200
UK
602heavy
pro stock
|
pro stock
Joined: Dec 2008
Posts: 1,200
UK
|
Comparing these two cams @ .050 duration is really a crap shoot & does'nt tell you anything , seat to seat timing #s will give a better idea on how these camshafts will behave (.004-.050") , could be chalk & cheese. Depending on intensity #s the smaller stick may be longer @ overlap & be a dog down low.
Last edited by 602heavy; 12/27/10 12:46 PM.
|
|
|
Re: 108 LSA vs 107 LSA
[Re: MR_P_BODY]
#888488
12/27/10 04:57 PM
12/27/10 04:57 PM
|
Joined: Dec 2009
Posts: 1,074
detroit, mi
POS Dakota
super stock
|
super stock
Joined: Dec 2009
Posts: 1,074
detroit, mi
|
Quote:
I think I would go with the 544... [Email]222@50[/Email] because
I believe either one is short on revs but this one will
hang on a bit longer... they both would have lump to
the idle
Yep!
In a motor that is dead from the factory at 4800 rpm, the longer cam will help.
|
|
|
Re: 108 LSA vs 107 LSA
[Re: 602heavy]
#888489
12/28/10 06:16 AM
12/28/10 06:16 AM
|
Joined: May 2008
Posts: 5,399
Aurora, Colorado
451Mopar
master
|
master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
|
Quote:
Comparing these two cams @ .050 duration is really a crap shoot & does'nt tell you anything , seat to seat timing #s will give a better idea on how these camshafts will behave (.004-.050") , could be chalk & cheese.
Depending on intensity #s the smaller stick may be longer @ overlap & be a dog down low.
You really would want more info on the cams lobe profile. With roller cams the 0.050" number only gives a general idea of the cams RPM range, but not the info needed to compare to fairly simular cams. What is the $130 "custom" cam? For that price I would guess it is a reground stock cam?
|
|
|
|
|
