My new h/c setup, some questions inside
My new h/c setup, some questions inside Well I've decided to get the TEA 5.3L Stage 1.5's and match them up with a TSP Torquer v 2 that I already have. At first I didn't want to flycut but have since decided to go ahead with it.
My target SCR is 11.36:1 & DCR is 8.60:1, here are the specs for how I plan to achieve it:
Heads: 5.3's milled to 59cc
Tv2: 232/234 .595/.598 112lsa 110icl
Gaskets: .040
Deck Height: +.008 (This is correct for a stock block right?)
One question I had was about flycutting and how it affects the cylinder volume. What is the most I can safely flycut a stock piston and what would the effect be when entering data into the compression calculator? (ie -1cc etc) For example, if everything else remained constant and the flycutting reduced the volume 1cc, the DCR is then 8.50:1 and the SCR is 11.21:1.
So do these numbers check out? Any thoughts on this combo? I should have no problems with PTVC if I flycut enough right? Any input is appreciated.
BTW this is going into the vette which has 4.10's and an LS6 intake.
My target SCR is 11.36:1 & DCR is 8.60:1, here are the specs for how I plan to achieve it:
Heads: 5.3's milled to 59cc
Tv2: 232/234 .595/.598 112lsa 110icl
Gaskets: .040
Deck Height: +.008 (This is correct for a stock block right?)
One question I had was about flycutting and how it affects the cylinder volume. What is the most I can safely flycut a stock piston and what would the effect be when entering data into the compression calculator? (ie -1cc etc) For example, if everything else remained constant and the flycutting reduced the volume 1cc, the DCR is then 8.50:1 and the SCR is 11.21:1.
So do these numbers check out? Any thoughts on this combo? I should have no problems with PTVC if I flycut enough right? Any input is appreciated.
BTW this is going into the vette which has 4.10's and an LS6 intake.
stock shortblock LS1's usually have a - (negitive) deck height. meaning the piston comes out the block. mine measured -0.005.
I'll give my calculator a go with your combo and see if i get the same thing. can you give me the specs of the T2 @ .006, .050, .200? thanks
btw, flycutting adds to the volume. think of a dish piston, its adding more volume to the combustion chamber, so it would lower the compression. reducing volume raises compression. (dome piston) so to answer your question a valve relief (flycut) is adding volume.
Jon
I'll give my calculator a go with your combo and see if i get the same thing. can you give me the specs of the T2 @ .006, .050, .200? thanks
btw, flycutting adds to the volume. think of a dish piston, its adding more volume to the combustion chamber, so it would lower the compression. reducing volume raises compression. (dome piston) so to answer your question a valve relief (flycut) is adding volume.
Jon
Last edited by ProjecT 9; Jul 16, 2007 at 06:24 PM.
Ok, I was getting the deck height confused with piston height, which according to Will Hanzels book is +.008. It makes sense that flycutting would add volume, thus reducing compression, but by how much? Not sure how that would be calculated.
Flycutting .100 should be around 1-2 cc's I believe. And its isnt a positive deck height, it should be negative(piston out of hole) That alone is gonna change your SCR a lot.
Originally Posted by brad8266
Flycutting .100 should be around 1-2 cc's I believe. And its isnt a positive deck height, it should be negative(piston out of hole) That alone is gonna change your SCR a lot.
Intake Duration: @.006=281 / @.050=232 / @.200=153
Exhaust Duration: @.006=283 / @.050=234 / @.200=155
LSA:112
ICL: 110
Overlap: @.006=58 / @.050=9 / @.200=-70
Bore: 3.898 (98 block)
Stroke: 3.622
Rod Length: 6.098
# Cylinders: 8
Deck Height: -.007
Piston Dish: 1.0 (added volume per cylinder)
Compressed Gasket Thickness: .045
Head Volume: 60cc
SCR: 11.35:1
DCR: 8.60:1
Rod to Stroke: 1.68:1
Bore to Stroek: 1.08:1
Quench Area: .038 (.045 -.007)
OK, that should be it, how does my SCR / DCR and quench look. Any area's that could be improved? Anything look wrong?
Originally Posted by brad8266
looks pretty good, although the actual valve events werent listed. I personally would run a .040 gasket and just be sure to measure your PTVC.
IVO: 30.5 / 6 / -33.5
IVC: 70.5 / 46 / 6.5
EVO: 75.5 / 51 / 11.5
EVC: 27.5 / 3 / -36.5
ECL: 114 / 114 / 114
Can you fill me in a little on what these valve events actually represent, and what they mean to someone building a h/c package. Thanks
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Originally Posted by NassyVette
.006 / .050 / .200
IVO: 30.5 / 6 / -33.5
IVC: 70.5 / 46 / 6.5
EVO: 75.5 / 51 / 11.5
EVC: 27.5 / 3 / -36.5
ECL: 114 / 114 / 114
Can you fill me in a little on what these valve events actually represent, and what they mean to someone building a h/c package. Thanks
IVO: 30.5 / 6 / -33.5
IVC: 70.5 / 46 / 6.5
EVO: 75.5 / 51 / 11.5
EVC: 27.5 / 3 / -36.5
ECL: 114 / 114 / 114
Can you fill me in a little on what these valve events actually represent, and what they mean to someone building a h/c package. Thanks
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Originally Posted by brad8266
It lets you know where your valve overlap area is in relation to TDC, this will play a part in rev capibility and top and low end power. You can kind of use the events to tell where you engine will make power.
EDIT: I'm also curious how to figure out how much I need to flycut my pistons in order for them to clear. Do I just shave the intake and exhaust down .100 each and then clay the piston and do a dry turn over of the crank?
Last edited by NassyVette; Jul 17, 2007 at 12:15 PM.
Heres the latest model using a .040 head gasket and keeping all other variables the same. It raised the compression to 11.50, will I be able to get away with the compression this high if I keep my quench tight?
Intake Duration: @.006=281 / @.050=232 / @.200=153
Exhaust Duration: @.006=283 / @.050=234 / @.200=155
LSA:112
ICL: 110
Overlap: @.006=58 / @.050=9 / @.200=-70
Bore: 3.898 (98 block)
Stroke: 3.622
Rod Length: 6.098
# Cylinders: 8
Deck Height: -.007
Piston Dish: 1.0 (added volume per cylinder)
Compressed Gasket Thickness: .040
Head Volume: 60cc
SCR: 11.50:1
DCR: 8.71:1
Rod to Stroke: 1.68:1
Bore to Stroek: 1.08:1
Quench Area: .033 (.040 -.007)
***.006 / .050 / .200
IVO: 30.5 / 6 / -33.5
IVC: 70.5 / 46 / 6.5
EVO: 75.5 / 51 / 11.5
EVC: 27.5 / 3 / -36.5
ECL: 114 / 114 / 114
Intake Duration: @.006=281 / @.050=232 / @.200=153
Exhaust Duration: @.006=283 / @.050=234 / @.200=155
LSA:112
ICL: 110
Overlap: @.006=58 / @.050=9 / @.200=-70
Bore: 3.898 (98 block)
Stroke: 3.622
Rod Length: 6.098
# Cylinders: 8
Deck Height: -.007
Piston Dish: 1.0 (added volume per cylinder)
Compressed Gasket Thickness: .040
Head Volume: 60cc
SCR: 11.50:1
DCR: 8.71:1
Rod to Stroke: 1.68:1
Bore to Stroek: 1.08:1
Quench Area: .033 (.040 -.007)
***.006 / .050 / .200
IVO: 30.5 / 6 / -33.5
IVC: 70.5 / 46 / 6.5
EVO: 75.5 / 51 / 11.5
EVC: 27.5 / 3 / -36.5
ECL: 114 / 114 / 114
Originally Posted by brad8266
im running around 12:0 SCR and im ok on 93 octane, I have a tight quench area too. Its doable.
I have diamond -2cc pistons, 232/236 .575 112 LSA, TEA stage 3 heads 57-58 cc with big valves. I like the mid size cam, high compression engine, it has great power down low. Its a good daily driver.
There really isnt a formula, you have to measure.
There really isnt a formula, you have to measure.
Originally Posted by brad8266
I have diamond -2cc pistons, 232/236 .575 112 LSA, TEA stage 3 heads 57-58 cc with big valves. I like the mid size cam, high compression engine, it has great power down low. Its a good daily driver.
There really isnt a formula, you have to measure.
There really isnt a formula, you have to measure.