NassyVette

iTrader: (22)

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.

ProjecT 9

iTrader: (6)

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

NassyVette

iTrader: (22)

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.

brad8266

iTrader: (23)

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.

NassyVette

iTrader: (22)

Ok, what was throwing me off was the (how much piston comes out of hole) note. Ok, so now figuring in a -.007 deck height to the dcr calculator here's the revised stats.

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?

brad8266

iTrader: (23)

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.

NassyVette

iTrader: (22)

***.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

brad8266

iTrader: (23)

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.

NassyVette

iTrader: (22)

So an IVO of 6 at .050 would mean the intake valve opens 6 degrees after top dead center? How do these valve events look? I'm planning on keeping the rev limiter around 6,800 and I've got 4.10's, my goal is just a fun more torqie car than it used to be (see sig numbers). Any estimates on what I'll put down with this combo?

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?

NassyVette

iTrader: (22)

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

brad8266

iTrader: (23)

im running around 12:0 SCR and im ok on 93 octane, I have a tight quench area too. Its doable.

NassyVette

iTrader: (22)

What's your h/c combo look like? And how much did you flycut? Is there any formula or method for determining how much you need to flycut for a particular setup?

brad8266

iTrader: (23)

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.

NassyVette

iTrader: (22)

Did you get the 5.3's? With 2.02 and 1.57 valves? I wish I could afford to just swap the pistons and not screw with the flycutting, but thats not the case. BTW thanks for your help.

brad8266

iTrader: (23)

yeah I have those heads, they are nice. Theres a good sticky on flycutting in here, its not difficult.