teksid build, 2618 alloy piston, piston to wall clearance

So I am checking into a teksid build with a 2618 alloy piston. This will be a .020" over build as it will have off the shelf parts.
Looking for advice on piston to wall gap considering expansion of 2618 alloy with up to 14lbs of boost. I want to give my machine shop the correct final bore size for this plan.

Details:
Teksid aluminum block (97 98) with torque plate hone
2618 alloy piston with side coating
Advertised piston size: 3.572
Raw piston size: 3.5685 (offering .0035" P to Wall gap)

Manufacture advises a bit more room with the boost goals to be set at .004".

So final size would be: 3.5725 (by this advice)

I am also trying to avoid cold piston slap. Manufactured stated .004" will be good for extra room for heat and should not be noisy.

Others running this gap with an aluminum block and 2618 piston?

Thanks

The arbitrary jump to +0.020'' is a bad idea if it isn't absolutely necessary. Your block is one-and-done at that point.

Everything you need to know ---> Aluminator Gibtec Build

jrgoffin said:

The arbitrary jump to +0.020'' is a bad idea if it isn't absolutely necessary. Your block is one-and-done at that point.

Everything you need to know ---> Aluminator Gibtec Build

Click to expand...

While I agree that going 20 over is a bad idea I wouldn't be surprised if OP is dealing with a shop that won't touch his block without it. The shops in my area are like this.

So I am getting a deal on a good teksid machined block with torque plates (just needs final hone), but it is a .020" setup, which I am fine with since it allows quick available parts. Don't have time or budget for things more custom.

So I am really looking to see if others have used about the same piston to wall clearance with a 2618 piston with side coatings (aluminum block) and say 15 lbs or less boost. Basically looks to be calling for .004" P. to wall clearance. Could go to .0045" if making more power (but that seems to much for my street/strip car with lots of miles planned). See details above from manufacture.

I am about to give the machine shop the requirement, so just want further feedback since I only get one shot to get it right. It is being shipped to me.

Also jrgoffin, thanks for that detailed build write up. That is great detail I will use along the way.

Thanks.

I’m running Manley Platinum Series that is a 2618 piston with skirt coating. Also in a .020 Teksid. They call for .003 clearance which is built into the piston so you can final bore at 3.572. The car sees a minimum of 18 psi. and up to 24 psi so far. At your boost level, if it’s a well made/known piston I don’t think you’ll have any issues staying with their standard PTW clearances. However, if they recommended additional clearance and feel confident you won’t get any piston slap then go with it.

Same here. I'm running the Manley 2618s in a 0.020" over Teksid and just went with the manufacturer PTW clearances. No slap and gets well over 15psi thrown at it.

Thanks for all the replies. All very good advice and feedback. After talking with Wiseco more about my setup and my machine shop, we are cutting it right at 3.572 which will give a .0035" P to wall gap. Thanks.