this a good deal for rods and pistons?
this a good deal for rods and pistons? first off i need a little help figuring out compression, I want to run low compression with my stock ls1 heads, i talked to a guy who says he has mahle pistons with a -16cc dish and says he has 8.7-1 CR would i need to do more then just get -16c dished pistons?
i was checkin out e-bay and found this
http://cgi.ebay.com/ebaymotors/ws/eB..._BIN_Stores_IT
think thats a good setup? i am looking to run about 850 wheel HP (FI) would i need to upgrade to the billet rods for the extra 110? also i talked to the guy and i can get -16 dished pistons for lower compression.
i was checkin out e-bay and found this
http://cgi.ebay.com/ebaymotors/ws/eB..._BIN_Stores_IT
think thats a good setup? i am looking to run about 850 wheel HP (FI) would i need to upgrade to the billet rods for the extra 110? also i talked to the guy and i can get -16 dished pistons for lower compression.
LS-1 based rods and pistons are specifically for LS-1's. The ones in the auction are for old school SBC's. For what you are wanting to do, I would reccomend looking into some SCAT H-beams or the Compstar rods. Both will handle what your wanting to do. Mahle does make LS-1 pistons, along with Diamond and many others. Plan to spend at least a grand or a little more on a good rod/piston combo for an LS-1.
do you guys know of any other "fairly inexpensive" piston rod combos around?
*edit thanks beast...can anyone tell me what piston specs i need to do to get around 8.5-1 CR with stock ls1heads
*edit thanks beast...can anyone tell me what piston specs i need to do to get around 8.5-1 CR with stock ls1heads
The Eagle rods will be the least expensive and still be forged. They will run you about $450. The SCATs are a better rod and will run you about the same. I got a good deal on my SCATs in a package deal for $420. The diamond and Mahle pistons seem to be more "budget" friendly when it comes to pistons.
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im running a diamond/eagle combo myself, the newer compstars are a really fine piece that i'd of got if they were out at the time.
i assume your staying with your ls1 block and the stock bore with a hone. in that case go with a 3.905 bore piston, 6.125" rods are what most guys run. with the longer rod your piston CH will be in the 1.315 range. you'll need to know your deck height and gasket compressed thickness as well to figure out your CR.
you'll need a approximately a 20cc dish to reach 8.5 using -.008 deck heigt and a .045 cometic with a 67cc head volume.
i assume your staying with your ls1 block and the stock bore with a hone. in that case go with a 3.905 bore piston, 6.125" rods are what most guys run. with the longer rod your piston CH will be in the 1.315 range. you'll need to know your deck height and gasket compressed thickness as well to figure out your CR.
you'll need a approximately a 20cc dish to reach 8.5 using -.008 deck heigt and a .045 cometic with a 67cc head volume.
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Originally Posted by jrp
you'll need a approximately a 20cc dish to reach 8.5 using -.008 deck heigt and a .045 cometic with a 67cc head volume.
so will bolting up a scat rod and a mahle -16dished piston to a motor with stock ls1 heads put me at around 9?
also i found a site
http://www.rbracing-rsr.com/compstaticcalc.html
what are our motors deck hight?
if i put 0 in i get a cr of 9.09
i don't know much about head gasket size but if i got up to a .05 thickness i get a cr of 8.91 and a thickness of .06 gets me 8.74
also i found a site
http://www.rbracing-rsr.com/compstaticcalc.html
what are our motors deck hight?
if i put 0 in i get a cr of 9.09
i don't know much about head gasket size but if i got up to a .05 thickness i get a cr of 8.91 and a thickness of .06 gets me 8.74
GM list deck range as 9.235 - 9.245 and pistons out the hole .008. i've seen tha vay from .002 to .010 on stock shortblocks. hence the reason you'll want to measure yours if you want to pin point your CR. also mic the gasket and CC the chamber volumes for precise measurements.
3.898
3.622
.052, .054, .055, .060 (take your pick as there's never been a 100% conclusive answer). i use .054 myself.
-.008 (oem). i use that, others use -.006 - .007
66 or 67cc (listed as 66.67)
stock pistons are flat top, in your case you'll enter the effective dome volume, this will include 2cc for valve reliefs
3.622
.052, .054, .055, .060 (take your pick as there's never been a 100% conclusive answer). i use .054 myself.
-.008 (oem). i use that, others use -.006 - .007
66 or 67cc (listed as 66.67)
stock pistons are flat top, in your case you'll enter the effective dome volume, this will include 2cc for valve reliefs