Is .028 quench to tight?
05-11-2010, 04:55 AM
#21
ok i checked my deck height again for the 50th time and iam coming up with .010-.011 out of the hole with the piston flat, and i came up with .023 rocked on one side and .024 rocked on the other side, soooo what is the minimum gasket i should go with .045 cometics, i have a set of .040s but that seems to tight of a quench, thanks for the help matt
05-11-2010, 05:59 PM
#24
.045 leaves you with the perfect quench distamce IMO....as long as your pistons dont have excessive piston to wall clearance (more clearance means more rock which means more quench distance required).
I usually shoot for .030 - .035.....but I also know I have minimal piston rock in all my builds.
Your deal at .033 with the .045 gasket should be fine. I dont recommend the .040 scenario for you.
-Tony
05-11-2010, 08:44 PM
#25
There's your answer right there!!
.045 leaves you with the perfect quench distamce IMO....as long as your pistons dont have excessive piston to wall clearance (more clearance means more rock which means more quench distance required).
I usually shoot for .030 - .035.....but I also know I have minimal piston rock in all my builds.
Your deal at .033 with the .045 gasket should be fine. I dont recommend the .040 scenario for you.
-Tony
.045 leaves you with the perfect quench distamce IMO....as long as your pistons dont have excessive piston to wall clearance (more clearance means more rock which means more quench distance required).
I usually shoot for .030 - .035.....but I also know I have minimal piston rock in all my builds.
Your deal at .033 with the .045 gasket should be fine. I dont recommend the .040 scenario for you.
-Tony
05-17-2010, 04:22 PM
#27
There's your answer right there!!
.045 leaves you with the perfect quench distamce IMO....as long as your pistons dont have excessive piston to wall clearance (more clearance means more rock which means more quench distance required).
I usually shoot for .030 - .035.....but I also know I have minimal piston rock in all my builds.
Your deal at .033 with the .045 gasket should be fine. I dont recommend the .040 scenario for you.
-Tony
.045 leaves you with the perfect quench distamce IMO....as long as your pistons dont have excessive piston to wall clearance (more clearance means more rock which means more quench distance required).
I usually shoot for .030 - .035.....but I also know I have minimal piston rock in all my builds.
Your deal at .033 with the .045 gasket should be fine. I dont recommend the .040 scenario for you.
-Tony
05-17-2010, 07:18 PM
#28
Go with the .045 is my suggestion....but I wouldn't lose sleep over either as long as you maintain the same static CR.
(Meaning going with the thicker gasket and not compensating with a slightly smaller chamber would cost you some power due to less quench and less static CR).
-Tony
05-18-2010, 09:36 PM
#30
On The Tree
don't forget about the piston rocking Deck height and quench are important. BUT you also need to understand that piston to bore clearance and skirt length can make a big diference in how much the piston can rock in the bore. If I am thinking right on your bore size it takes .006" for 1cc of volume. So even with .012" extra deck clearance you are only adding 2cc or so of volume. I think the extra room is worth more than the min gain in hp.
Just a few thoughts out loud.
When we tune a car on the dyno we always take a couple degrees back in timing so the customer has a safe tune and doesn't hurt his engine because of a tank of crappy fuel. Set the tune on kill and no cusion for driver(customer) brain fart.
Aleck
Just a few thoughts out loud.
When we tune a car on the dyno we always take a couple degrees back in timing so the customer has a safe tune and doesn't hurt his engine because of a tank of crappy fuel. Set the tune on kill and no cusion for driver(customer) brain fart.
Aleck
05-20-2010, 07:27 PM
#31
He used to have his shop a few streets down from Shafiroffs older place in W. Babylon....
Ive helped him a few times here and there at AFR but I dont speak with him on a regular basis at all.
Not even sure if he's still in Long Island.
-Tony
05-22-2010, 08:20 PM
#32
Steve from Long Island?
He used to have his shop a few streets down from Shafiroffs older place in W. Babylon....
Ive helped him a few times here and there at AFR but I dont speak with him on a regular basis at all.
Not even sure if he's still in Long Island.
-Tony
He used to have his shop a few streets down from Shafiroffs older place in W. Babylon....
Ive helped him a few times here and there at AFR but I dont speak with him on a regular basis at all.
Not even sure if he's still in Long Island.
-Tony
05-23-2010, 05:30 AM
#33
I'd run the .051" $28 GM MLS gaskets from scoggin dickey and call it a day. There is nothing wrong with .040" quench. The extra safety is worth the piece of mind. What do I know though my budget non ported / non optimal quench junk made more toque under 4000 rpm than most high dollar setups. If you're worried about the lower compression go spend $50 at an automotive machine shop and have them mill the heads.
05-23-2010, 08:08 PM
#34
I'd run the .051" $28 GM MLS gaskets from scoggin dickey and call it a day. There is nothing wrong with .040" quench. The extra safety is worth the piece of mind. What do I know though my budget non ported / non optimal quench junk made more toque under 4000 rpm than most high dollar setups. If you're worried about the lower compression go spend $50 at an automotive machine shop and have them mill the heads.
05-23-2010, 08:53 PM
#35
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i finally got my mahle -4cc pistons in with my stock crank and ls2 rods, now i checked my deck height and i came up with .011-.012 deck height will i have enough room with .040 cometic head gaskets which would be .028-.029 quench? also this is gunna be my daily driver with 11:1 compression and running on 93 octane. any help apprciated thanks matt
05-25-2010, 12:18 PM
#39
Is there a average how much stock pistons stick out of the block on a stock LS1? The heads I have now cc'd at 64. After I measure PTV I will have them milled some to get closer to 62. I am wanting around 11.5:1, that's with a .51 MLS gasket.
I think Tony touched on this a few posts up but I want to make sure. For me to get around .40 quench the stock piston is going to have to be up .11 right? Should I run a thinner head gasket that would up my quench and compression or just have the heads milled to up the compression.
I am not meaning to high jack your thread. Since you figured out what you are going to do I thought it made more since to post in here instead of starting a new thread almost the same.
I think Tony touched on this a few posts up but I want to make sure. For me to get around .40 quench the stock piston is going to have to be up .11 right? Should I run a thinner head gasket that would up my quench and compression or just have the heads milled to up the compression.
I am not meaning to high jack your thread. Since you figured out what you are going to do I thought it made more since to post in here instead of starting a new thread almost the same.
05-25-2010, 02:27 PM
#40
They stick up .006-.008". 62cc chambers with the GM .051" gasket will give 11:1 compression. If you are paying to have the heads milled have them milled to the spec you want the first time so you do not have to waste money on cometic gaskets. Every .0065" milled off the head will = 1cc. A 59cc chamber will get you 11.42:1 with a GM MLS gasket. A .040" cometic will get you 11.47:1 with a 61 cc chamber. If you are running anything over a mid 220's duration cam you will need to notch your pistons for proper piston to valve clearance.