Want a cheap cam upgrade but keep this same sound - video
05-12-2015, 04:06 PM
#21
Teching In
Thread Starter
Join Date: Mar 2015
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
05-12-2015, 04:13 PM
#22
Teching In
Thread Starter
Join Date: Mar 2015
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
Ok so I played with a overlap calculator for a bit which asked for intake and exhaust duration and LSA as inputs and returned overlap. I put in 218, 228, 112, and got back an overlap of -1. So did you mean anything less than -4 overlap will not be too choppy? Or will my cam choice #2 with -1 overlap not be very choppy? BUT, if I put 115 LSA into the calculator I get back -7 overlap. So are there more variables that should be going into this calculator to get a more accurate overlap answer? How much does adding a couple degrees LSA detract from performance?
05-12-2015, 07:57 PM
#25
Teching In
Thread Starter
Join Date: Mar 2015
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
I've been reading the Why LSA doesn't matter sticky, but if the online overlap calculator is correct then LSA seems to have direct (indirect, rather) relationship with overlap. So it seems like if I add LSA to the above cam the overlap goes down and therefore idle is smoother.
05-12-2015, 09:44 PM
#26
Teching In
Thread Starter
Join Date: Mar 2015
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
OK, so for $250 shipped I think I'm going to get a freshly ground 218/228 .550/.550 116lsa cam. According to the online calculator that should put overlap at -9. I'll place the order tomorrow after school so if this is a bad idea or won't idle smooth someone stop me!
Thanks everyone!
Thanks everyone!
05-13-2015, 12:19 AM
#27
On The Tree
iTrader: (1)
Join Date: Feb 2003
Location: San Diego, CA
Posts: 135
Likes: 0
Received 0 Likes
on
0 Posts
But surely if I bought this cam as it comes 218/228 .550/.550 112lsa but got it ground on 116lsa instead (which would apparently change the overlap from -1 to -9) I would not see as big of an increase in power, correct? I just don't know if there would be 3hp difference or 15hp difference.
I'm sure your vendor who spec'd the cam is taking all the efficiencies into account with your mods & goals in mind from information you provided to them.
Congrats on your cam !! I'm sure you will be happy and surprised what a baby cam will do for your car
.
05-13-2015, 07:10 AM
#28
I'll place the order tomorrow after school so if this is a bad idea or won't idle smooth someone stop me!
05-13-2015, 02:48 PM
#29
Launching!
Join Date: Oct 2010
Location: Houston, TX
Posts: 227
Likes: 0
Received 0 Likes
on
0 Posts
theres the trickflow cam i almost put in mine. seems like a good one that would work.
216/220 .560/.560 lsa114
http://www.summitracing.com/parts/tfs-30602001
calc says it has a -10 overlap.
216/220 .560/.560 lsa114
http://www.summitracing.com/parts/tfs-30602001
calc says it has a -10 overlap.
05-13-2015, 03:50 PM
#31
OK, so for $250 shipped I think I'm going to get a freshly ground 218/228 .550/.550 116lsa cam. According to the online calculator that should put overlap at -9. I'll place the order tomorrow after school so if this is a bad idea or won't idle smooth someone stop me!
Thanks everyone!
Thanks everyone!
That's only IF you feel you need slightly better low-end power, over top-end power and a slightly smoother idle.
Last edited by 99Bluz28; 05-13-2015 at 03:58 PM.
05-13-2015, 07:10 PM
#32
Teching In
Thread Starter
Join Date: Mar 2015
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
With all else being equal on the 218/228 cam, to include the same amount of advance on the cam, like +2. The 112lsa cam would have IVC of 39, and with a 116lsa would have a IVC of 43. So the power-band with the 116lsa would roughly start and end about 300rpm higher than with a 112lsa, and the power band will also be flatter with a little less midrange power than with the 112lsa. So with that said I'd recommend running a 114lsa for a slightly lower power-band because of the lower IVC, but still have -5* overlap so it runs fairly smooth.
That's only IF you feel you need slightly better low-end power, over top-end power and a slightly smoother idle.
That's only IF you feel you need slightly better low-end power, over top-end power and a slightly smoother idle.
I have couple days if I decide to change the lsa so 114 or 115 is an option!
05-14-2015, 09:08 PM
#35
Teching In
Thread Starter
Join Date: Mar 2015
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
Ok, so the cam guy says the 116lsa cam should have a powerband around 3800 to 6300 with the power starting to come on around 1900 rpm. I figure there are pros and cons, for me at least, of focusing performance either high end or low end. And I probably am too inexperienced to notice a difference. So as long as its not worse anywhere than the ls1 cam and nets me about 20 hp then I'm a happy camper.
I've always wondered what that "+2" meant after the lsa and now I know!
Thank you, thank you, thank you!
I've always wondered what that "+2" meant after the lsa and now I know!
Thank you, thank you, thank you!
05-18-2015, 08:04 PM
#36
Ended up going with a used SLP 51011 cam.
The specs are:
Camshaft Specs: Valve Lift Duration Duration@.050
in: .559" 267º 214º
ex: .566" 275º 222º
Centerline - 111º
Lobe Separation - 115º
Therefor: IO=23 BTDC IC=64 ABDC @ Adv
EO=77 BBDC EC=18 ATDC @ Adv
IO=-4 BTDC IC=38 ABDC @ 0.050
EO=50 BBDC EC=-8 ATDC @ 0.050
Paid $220 shipped cause I wanted it quick and didn't want to bother haggling. I am also having my head internals put into a set of take off 243s and I just purchased a dorman ls6 intake from Rockauto for $298 shipped.
Is this centerline close to the stock ls1 cam? Because that's what determines if I need to adjust valve lash right?
So I have a pretty free flowing 3 in exhaust with none of the factory emissions crap and no cat, does anyone think I might see 400 rwhp through a 5 speed?
Thanks guys! Can't wait to drive it again!
The specs are:
Camshaft Specs: Valve Lift Duration Duration@.050
in: .559" 267º 214º
ex: .566" 275º 222º
Centerline - 111º
Lobe Separation - 115º
Therefor: IO=23 BTDC IC=64 ABDC @ Adv
EO=77 BBDC EC=18 ATDC @ Adv
IO=-4 BTDC IC=38 ABDC @ 0.050
EO=50 BBDC EC=-8 ATDC @ 0.050
Paid $220 shipped cause I wanted it quick and didn't want to bother haggling. I am also having my head internals put into a set of take off 243s and I just purchased a dorman ls6 intake from Rockauto for $298 shipped.
Is this centerline close to the stock ls1 cam? Because that's what determines if I need to adjust valve lash right?
So I have a pretty free flowing 3 in exhaust with none of the factory emissions crap and no cat, does anyone think I might see 400 rwhp through a 5 speed?
Thanks guys! Can't wait to drive it again!
05-19-2015, 01:35 PM
#40
Teching In
Thread Starter
Join Date: Mar 2015
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
That's the plan! Hopefully I can find someone who knows what they're doing