Stock LS1 + 228/232/588/592 110+1 = Clearance?
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Stock LS1 + 228/232/588/592 110+1 = Clearance?
I just arranged to buy a custom Comp grind from forum bro 1stz06. Specs are 228/232 .588/.592, on a 110+1. Yes, another Patrick G grind.
This is going on a stock '02 LS1. Based on what I've read in other threads I get the impression this *should* clear if installed straight up, but I'd like other opinions. It's not a standard grind so it's hard to find equivalent examples.
Thanks in advance!
This is going on a stock '02 LS1. Based on what I've read in other threads I get the impression this *should* clear if installed straight up, but I'd like other opinions. It's not a standard grind so it's hard to find equivalent examples.
Thanks in advance!
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I haven't seen the full cam card yet. But, given the specs it appears to be an XER 3724/3726 combo.
I'd check for sure if I was doing the install myself, but I am shopless. I'll have to see if any of the shops around here can do that without pulling the heads. You'd think so, but when I asked one repected shop about shimming the springs to within .050 of coil-bind I got the 'ol mumbo-jumbo. I almost get the impression a lot of these guys are just parts installers.
I dunno, maybe I'm unrealistic. I'd like to have my cam degreed, P to V checked, springs shimmed, and geometry checked. Is that too much to ask? How much should all that run, over and above the cost of an install? Do any shops do that, or only guys who are working on their own cars?
OTOH, I should think there would be a formula that would let you calculate clearance, if you knew the valve drop on a given setup, and had a reasonable approximation of the lobe lifts. Since practically all the cams of interest use Comp lobes it shouldn't be all that hard to amass a lobe table with lifts at say 10 or 20 degree increments. Interpolate what's in between. Any of you ME students out there up on your dynamics? Good extra-credit project.
I'd check for sure if I was doing the install myself, but I am shopless. I'll have to see if any of the shops around here can do that without pulling the heads. You'd think so, but when I asked one repected shop about shimming the springs to within .050 of coil-bind I got the 'ol mumbo-jumbo. I almost get the impression a lot of these guys are just parts installers.
I dunno, maybe I'm unrealistic. I'd like to have my cam degreed, P to V checked, springs shimmed, and geometry checked. Is that too much to ask? How much should all that run, over and above the cost of an install? Do any shops do that, or only guys who are working on their own cars?
OTOH, I should think there would be a formula that would let you calculate clearance, if you knew the valve drop on a given setup, and had a reasonable approximation of the lobe lifts. Since practically all the cams of interest use Comp lobes it shouldn't be all that hard to amass a lobe table with lifts at say 10 or 20 degree increments. Interpolate what's in between. Any of you ME students out there up on your dynamics? Good extra-credit project.
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Originally Posted by Gannet
I almost get the impression a lot of these guys are just parts installers.
#5
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Norris motorsport and VINCI
PTV will be fine on unmilled/stock gasket combo. Degreing this cam to make sure it is 110+1 is crutial (or doctor the thing to know if dot-dot is exactly that)
But, if cam only, I suggest advancing the cam another 2*
It will raise the DCR a tad (another .2 for ~ 8.2)
i would run 7.425 Comp cam p-rods
PTV will be fine on unmilled/stock gasket combo. Degreing this cam to make sure it is 110+1 is crutial (or doctor the thing to know if dot-dot is exactly that)
But, if cam only, I suggest advancing the cam another 2*
It will raise the DCR a tad (another .2 for ~ 8.2)
i would run 7.425 Comp cam p-rods
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Originally Posted by PREDATOR-Z
Norris motorsport and VINCI
PTV will be fine on unmilled/stock gasket combo. Degreing this cam to make sure it is 110+1 is crutial (or doctor the thing to know if dot-dot is exactly that)
But, if cam only, I suggest advancing the cam another 2*
It will raise the DCR a tad (another .2 for ~ 8.2)
i would run 7.425 Comp cam p-rods
PTV will be fine on unmilled/stock gasket combo. Degreing this cam to make sure it is 110+1 is crutial (or doctor the thing to know if dot-dot is exactly that)
But, if cam only, I suggest advancing the cam another 2*
It will raise the DCR a tad (another .2 for ~ 8.2)
i would run 7.425 Comp cam p-rods
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Originally Posted by PREDATOR-Z
He said that he is getting it used from another member.
BTW straight up means 0 advance like 110 LSA, 110 ICL
I think you meant dot-to-dot
BTW straight up means 0 advance like 110 LSA, 110 ICL
I think you meant dot-to-dot
I'm curious as to why you think longer pushrods would be a better fit in this case?
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I have this cam(Being tuned on the 17th) and with a .045 gasket it cleared without issue. I wouldn't run a LSK on the exhaust side on this cam, as the piston chases the exhaust side. Intake valve has tons of room though and thats where my LSK lobe is. Hoping for 430hp and 400 trq with tons of power under the curve. I've done every bolton besides a FAST or EWP. I'm sure a FAST would net me some more power but i have to convince myself the 10-15hp is worth 1K...
227/232 .640/.595 110(+1) Again should have numbers 11/17/06..
227/232 .640/.595 110(+1) Again should have numbers 11/17/06..
#11
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Originally Posted by Gannet
I did mean dot-to-dot, or 109 ICL in this case. Thanks for the correction. That's what I come here for, to learn.
I'm curious as to why you think longer pushrods would be a better fit in this case?
I'm curious as to why you think longer pushrods would be a better fit in this case?
On a cam only swap, the XE-R lobes have a smaller base circle of at least .09x (depending on lifts). Half that amount is the effective amount needed to add to the stock length p-rods (7.400) to get back to the stock preload on lifters.
So ideally, the p-rods used should be 7.44x.
Now it is in general better not to go over that so the next logical smaller size is 7.425s
see Comp cam makes p-rods in .025 increaments. 7.325-7.350-7.375-7.400-7.425-7.50
I hope this makes sense. 7.425s will reduce the sewing machine effect normaly encountered with 7.400 on smaller lobes.
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Originally Posted by PREDATOR-Z
I hope this makes sense. 7.425s will reduce the sewing machine effect normaly encountered with 7.400 on smaller lobes.
So now I'm curious why all the shops selling XER-based cam&kits are shipping 7.4s...
Last edited by Gannet; 11-04-2006 at 11:54 AM.
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Gannet, there is a guy here named Pewterme. Do a search of his threads. He is running this cam with stock heads. He also had the cam installed dot-to-dot and then went back and had it advanced. I am sure he can pass along some useful information to you.
Best wishes,
J.R. Thomas
Best wishes,
J.R. Thomas
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Originally Posted by 1stz06
Gannet, there is a guy here named Pewterme. Do a search of his threads. He is running this cam with stock heads. He also had the cam installed dot-to-dot and then went back and had it advanced. I am sure he can pass along some useful information to you.
Best wishes,
J.R. Thomas
Best wishes,
J.R. Thomas