Thinnest head gasket I can use stock bottom ls1
05-14-2018, 07:17 PM
#1
TECH Fanatic
Thread Starter
Thinnest head gasket I can use stock bottom ls1 Trying to see how thin I can go without having to worry about the pistons hitting the heads. Just need to know what kind of tolerances I have to work with when everything heats up. Ptv clearance is fine, just trying to get a hair more compression. Not decking the heads anymore than they already are 59cc. Piston come out of bore when it’s shoved to one side is about .016 to .018. When flat it’s about .008 out of bore. Was going to use .040 compressed gaskets Cometic but had to pull the heads back off. They make .027, .030, .036 and of course .040 gaskets.
Any engine builders in here?
Any engine builders in here?
05-14-2018, 08:49 PM
#2
Never use the head gasket to adjust static compression ratio. The small amount you might gain just really wouldn't matter.
Instead, use the head gasket to set quench. Proper quench will make more power, and make the engine more efficient and longer lasting. Learn how to accurately measure piston height, and then pick the correct head gasket from that.
Instead, use the head gasket to set quench. Proper quench will make more power, and make the engine more efficient and longer lasting. Learn how to accurately measure piston height, and then pick the correct head gasket from that.
05-15-2018, 12:54 PM
#3
TECH Fanatic
Thread Starter
Never use the head gasket to adjust static compression ratio. The small amount you might gain just really wouldn't matter.
Instead, use the head gasket to set quench. Proper quench will make more power, and make the engine more efficient and longer lasting. Learn how to accurately measure piston height, and then pick the correct head gasket from that.
Instead, use the head gasket to set quench. Proper quench will make more power, and make the engine more efficient and longer lasting. Learn how to accurately measure piston height, and then pick the correct head gasket from that.
11-27-2018, 04:42 PM
#8
I'd stick with a minimum of .040 on an LS personally.
Thinner headgaskets are expensive, but ws6store now has thinner gaskets for OE gasket prices. I believe they are .045 IIRC
edit: its these
http://www.ws6project.com/user_stor/...oducts_id=6909
Thinner headgaskets are expensive, but ws6store now has thinner gaskets for OE gasket prices. I believe they are .045 IIRC
edit: its these
http://www.ws6project.com/user_stor/...oducts_id=6909
11-27-2018, 08:18 PM
#9
I'd stick with a minimum of .040 on an LS personally.
Thinner headgaskets are expensive, but ws6store now has thinner gaskets for OE gasket prices. I believe they are .045 IIRC
edit: its these
http://www.ws6project.com/user_stor/...oducts_id=6909
Thinner headgaskets are expensive, but ws6store now has thinner gaskets for OE gasket prices. I believe they are .045 IIRC
edit: its these
http://www.ws6project.com/user_stor/...oducts_id=6909
****.. I would have used those on my build ..FUCKKK
11-27-2018, 09:12 PM
#10
TECH Fanatic
Thread Starter
I ended up using stock on mine. I got to reading a lot on it and what engine builders were recommending. The tiny amount of compression bump would have hardly made it worth the extra money.
11-28-2018, 08:34 AM
#14
TECH Fanatic
I'd stick with a minimum of .040 on an LS personally.
Thinner headgaskets are expensive, but ws6store now has thinner gaskets for OE gasket prices. I believe they are .045 IIRC
edit: its these
http://www.ws6project.com/user_stor/catalog/product_info.php?cPath=235_87_289&products_id=6909
Thinner headgaskets are expensive, but ws6store now has thinner gaskets for OE gasket prices. I believe they are .045 IIRC
edit: its these
http://www.ws6project.com/user_stor/catalog/product_info.php?cPath=235_87_289&products_id=6909
11-28-2018, 10:23 AM
#15
Thats why we came out with them.
.035 is ideally the minimum i wou run (or tightest depending on how you word it) on pump gas. Winter blend fuel is very different from summer blend and no place gets exactly the same quality of fuel all the time.
.035 is ideally the minimum i wou run (or tightest depending on how you word it) on pump gas. Winter blend fuel is very different from summer blend and no place gets exactly the same quality of fuel all the time.
11-28-2018, 11:42 AM
#16
I've been meaning to look into winter blends, all I know is that they exist, can you cliff notes what to expect? Is it generally higher ethanol? I assume so because I tend to hear complaints of MPG drop in the cooler months. However ethanol is harder to light off in the cold so seems counter intuitive
11-28-2018, 02:32 PM
#17
All gasoline by now will be a winter blend. It mostly has to do with vapor pressure. It has a higher vapor pressure than summer blends do. You can see why if you let some fuel sit in a plastic gas can. In the winter it will pull the sides of the can in. In the summer it will oush it out. The fuel companies change the mixture to keep that from happening to a certain degree.
The reason you normally get worse mpg is due to driving habits, cold start/afterstart cold enrichment and the afr that vehicles usually target when cold/spark timing when cold. Also loss of traction etc doesnt help and cold tires dont help as well. The air is more dense below mountain altitudes so that comes into effect also.
Storing a winter blend and using in the summer can have some good effects on power though. Ive seen it on the dyno before.
The reason you normally get worse mpg is due to driving habits, cold start/afterstart cold enrichment and the afr that vehicles usually target when cold/spark timing when cold. Also loss of traction etc doesnt help and cold tires dont help as well. The air is more dense below mountain altitudes so that comes into effect also.
Storing a winter blend and using in the summer can have some good effects on power though. Ive seen it on the dyno before.
11-28-2018, 04:48 PM
#18
All gasoline by now will be a winter blend. It mostly has to do with vapor pressure. It has a higher vapor pressure than summer blends do. You can see why if you let some fuel sit in a plastic gas can. In the winter it will pull the sides of the can in. In the summer it will oush it out. The fuel companies change the mixture to keep that from happening to a certain degree.
The reason you normally get worse mpg is due to driving habits, cold start/afterstart cold enrichment and the afr that vehicles usually target when cold/spark timing when cold. Also loss of traction etc doesnt help and cold tires dont help as well. The air is more dense below mountain altitudes so that comes into effect also.
Storing a winter blend and using in the summer can have some good effects on power though. Ive seen it on the dyno before.
The reason you normally get worse mpg is due to driving habits, cold start/afterstart cold enrichment and the afr that vehicles usually target when cold/spark timing when cold. Also loss of traction etc doesnt help and cold tires dont help as well. The air is more dense below mountain altitudes so that comes into effect also.
Storing a winter blend and using in the summer can have some good effects on power though. Ive seen it on the dyno before.
Interesting, thanks
12-29-2018, 02:11 PM
#19
So would the .04 cometic gaskets be perfectly safe to use with un-milled 241 heads? I like the idea of the much better prices for the rpmspeed .045 gaskets, but if it's OK to go even thinner I'd pay the extra. This is to improve quench the max amount, since detonation has been an issue. Could the heads also be milled any? The .04 gaskets minus .005 milled with my cam would put me right about 10.6 static CR and 8.5 DCR.