There HAS to be someone here with PRC 2.5 5.3s, TV2, and .040 gaskets...
05-30-2013, 08:21 PM
#21
On The Tree
Thread Starter
Join Date: Sep 2008
Posts: 167
Likes: 0
Received 0 Likes
on
0 Posts
good set up should make some power.
I'm running a magic stick 4 its a little bigger than TV2 , I tried to squeeze every little bit out of it i could , most is in my signature , but i fly cut my pistion the intake was right at .095 and the exhaust .015 ,used a .045 gasket , and i spray the **** out of it , cut the pistons in the block, had a real good cutter from dave Lindley tools and he bought it back when i was done with it . Had a good quench area.
Do your math check ur pv clearence , push rod length, Quench area , compression static and dynamic that way u know. If u have not found it yet when milling ur heads its bout .006 a CC, so the 2.5stage-5.3 heads are bout 63cc after they work them, they rasie the roof alittle. So milling .024 gets about 59cc chamber, this will help u do some math on ur set up . if u already know all of this forgive me just trying to be helpful.
just throwing another set up out there .
Happy wrenching
I'm running a magic stick 4 its a little bigger than TV2 , I tried to squeeze every little bit out of it i could , most is in my signature , but i fly cut my pistion the intake was right at .095 and the exhaust .015 ,used a .045 gasket , and i spray the **** out of it , cut the pistons in the block, had a real good cutter from dave Lindley tools and he bought it back when i was done with it . Had a good quench area.
Do your math check ur pv clearence , push rod length, Quench area , compression static and dynamic that way u know. If u have not found it yet when milling ur heads its bout .006 a CC, so the 2.5stage-5.3 heads are bout 63cc after they work them, they rasie the roof alittle. So milling .024 gets about 59cc chamber, this will help u do some math on ur set up . if u already know all of this forgive me just trying to be helpful.
just throwing another set up out there .
Happy wrenching
Just saw the info you edited in. Thanks, that will definitely help. I just have to find numbers to punch into a SCR calculator. If I remember correctly on a stock bottom end the piston is out of the hole a few thousandths (I may be wrong). I know its somewhere here on the forum, just gotta find it. lol
05-30-2013, 09:00 PM
#22
TECH Senior Member
Guys, it is not a matter of being macho. The reason sometimes I loose my cool and just say things straight up is because I probably made the mistake before and experienced the consequences. Putting everything on paper gives you an idea but is far from actual truth.
Even from factory, the measurements on any motor will vary. For example 'piston out of hole' in stock form can vary from .005>.008 (usually .007 on average). So I personally wish that people would put in the effort and time in learning how to do things right the first time.
Now, going back to the issue at hand here. First Q needing answering is what is the LSA and ICL (advance) in the TV2 you'll be using?
Even from factory, the measurements on any motor will vary. For example 'piston out of hole' in stock form can vary from .005>.008 (usually .007 on average). So I personally wish that people would put in the effort and time in learning how to do things right the first time.
Now, going back to the issue at hand here. First Q needing answering is what is the LSA and ICL (advance) in the TV2 you'll be using?
05-30-2013, 09:10 PM
#23
On The Tree
Thread Starter
Join Date: Sep 2008
Posts: 167
Likes: 0
Received 0 Likes
on
0 Posts
Guys, it is not a matter of being macho. The reason sometimes I loose my cool and just say things straight up is because I probably made the mistake before and experienced the consequences. Putting everything on paper gives you an idea but is far from actual truth.
Even from factory, the measurements on any motor will vary. For example 'piston out of hole' in stock form can vary from .005>.008 (usually .007 on average). So I personally wish that people would put in the effort and time in learning how to do things right the first time.
Now, going back to the issue at hand here. First Q needing answering is what is the LSA and ICL (advance) in the TV2 you'll be using?
Even from factory, the measurements on any motor will vary. For example 'piston out of hole' in stock form can vary from .005>.008 (usually .007 on average). So I personally wish that people would put in the effort and time in learning how to do things right the first time.
Now, going back to the issue at hand here. First Q needing answering is what is the LSA and ICL (advance) in the TV2 you'll be using?
I would be using the standard 112 LSA. Also like I said in my reply to "justafool", I understand where you are coming from. I know a lot of people here are looking answers you could measure with a micrometer, and then hold the people that gave them the answer liable for it. That's not what I'm here for. I just want to get some examples of what other peoples PTVs have been on this setup so i can have a general idea of whether or not I would be cutting it close.
05-31-2013, 09:00 PM
#25
05-31-2013, 10:25 PM
#26
On The Tree
Thread Starter
Join Date: Sep 2008
Posts: 167
Likes: 0
Received 0 Likes
on
0 Posts
Thanks for the info. Do you know of someone who has run this setup or just using your experience and basing it off the fact that the cam is relatively low duration with mildish lobes? Sorry, don't mean to pry, just curious.
05-31-2013, 10:33 PM
#27
On The Tree
Thread Starter
Join Date: Sep 2008
Posts: 167
Likes: 0
Received 0 Likes
on
0 Posts
06-01-2013, 03:53 PM
#28
it's going to the dyno and getting tuned right from the shop when everything is installed. i'll post some numbers on here for ya.
06-01-2013, 06:59 PM
#29
On The Tree
Thread Starter
Join Date: Sep 2008
Posts: 167
Likes: 0
Received 0 Likes
on
0 Posts
06-01-2013, 08:26 PM
#30
The only reason I recommended said combo for Nathan is many of my own customers have measured our SNS Stage 2 cam and I know what range of measurements 99.9% of every user out there will see with a given combination.
Another thing to think about here guys is which 5.3 head you're using. There were two different chamber sizes used on a "5.3" head. Which casting number you're using would be a good indication of P to V. What size valves are being used etc. The 862 and 706 casting 5.3 heads have a 61cc chamber where as a 799 5.3 casting has a 64.5cc chamber.
Say for instance the 2.0" intake valve Ai uses on their 5.3 heads. If you send them a 862 casting head with a 1.89" intake valve stock, and have a 2.0" intake valve installed, the valve drop that head has is almost identical to a 241 head. Gaining tremendous compression without losing P to V compared to what a LS1 had stock. With a 2.02" intake valve you still have gained tremendous compression when used on a 862 casting while only losing .010"-.015" P to V depending on the margin of the valve used.
Now you take a 799 head with a 64.5cc chamber, install a 2.02" intake valve, then mill it down to 61cc and you've lost over .020 p to v on the intake just to achieve the same compression the 862 head with a 2.02" valve has.
Different tolerances will change these measurements.
Another thing to think about here guys is which 5.3 head you're using. There were two different chamber sizes used on a "5.3" head. Which casting number you're using would be a good indication of P to V. What size valves are being used etc. The 862 and 706 casting 5.3 heads have a 61cc chamber where as a 799 5.3 casting has a 64.5cc chamber.
Say for instance the 2.0" intake valve Ai uses on their 5.3 heads. If you send them a 862 casting head with a 1.89" intake valve stock, and have a 2.0" intake valve installed, the valve drop that head has is almost identical to a 241 head. Gaining tremendous compression without losing P to V compared to what a LS1 had stock. With a 2.02" intake valve you still have gained tremendous compression when used on a 862 casting while only losing .010"-.015" P to V depending on the margin of the valve used.
Now you take a 799 head with a 64.5cc chamber, install a 2.02" intake valve, then mill it down to 61cc and you've lost over .020 p to v on the intake just to achieve the same compression the 862 head with a 2.02" valve has.
Different tolerances will change these measurements.
06-01-2013, 08:45 PM
#31
TECH Senior Member
I used to run that cam but on a 113 LSA so I have a pretty good idea. I've also run other similar durations on various LSA.
06-01-2013, 08:51 PM
#32
On The Tree
Thread Starter
Join Date: Sep 2008
Posts: 167
Likes: 0
Received 0 Likes
on
0 Posts
The only reason I recommended said combo for Nathan is many of my own customers have measured our SNS Stage 2 cam and I know what range of measurements 99.9% of every user out there will see with a given combination.
Another thing to think about here guys is which 5.3 head you're using. There were two different chamber sizes used on a "5.3" head. Which casting number you're using would be a good indication of P to V. What size valves are being used etc. The 862 and 706 casting 5.3 heads have a 61cc chamber where as a 799 5.3 casting has a 64.5cc chamber.
Say for instance the 2.0" intake valve Ai uses on their 5.3 heads. If you send them a 862 casting head with a 1.89" intake valve stock, and have a 2.0" intake valve installed, the valve drop that head has is almost identical to a 241 head. Gaining tremendous compression without losing P to V compared to what a LS1 had stock. With a 2.02" intake valve you still have gained tremendous compression when used on a 862 casting while only losing .010"-.015" P to V depending on the margin of the valve used.
Now you take a 799 head with a 64.5cc chamber, install a 2.02" intake valve, then mill it down to 61cc and you've lost over .020 p to v on the intake just to achieve the same compression the 862 head with a 2.02" valve has.
Different tolerances will change these measurements.
Another thing to think about here guys is which 5.3 head you're using. There were two different chamber sizes used on a "5.3" head. Which casting number you're using would be a good indication of P to V. What size valves are being used etc. The 862 and 706 casting 5.3 heads have a 61cc chamber where as a 799 5.3 casting has a 64.5cc chamber.
Say for instance the 2.0" intake valve Ai uses on their 5.3 heads. If you send them a 862 casting head with a 1.89" intake valve stock, and have a 2.0" intake valve installed, the valve drop that head has is almost identical to a 241 head. Gaining tremendous compression without losing P to V compared to what a LS1 had stock. With a 2.02" intake valve you still have gained tremendous compression when used on a 862 casting while only losing .010"-.015" P to V depending on the margin of the valve used.
Now you take a 799 head with a 64.5cc chamber, install a 2.02" intake valve, then mill it down to 61cc and you've lost over .020 p to v on the intake just to achieve the same compression the 862 head with a 2.02" valve has.
Different tolerances will change these measurements.
