High performance motor build.

So Cal Mark · Post by **So Cal Mark** » Mon Dec 10, 2012 12:39 am

one of the vendors in Texas is stilling selling the 8mm dome pistons and claiming they are 9.8 to 1

narfire · Post by **narfire** » Mon Dec 10, 2012 2:07 am

All I've seen from IAP are flat top HC pistons 84.4mm Mahle.
I bought a set of domed years ago(Texas) , I shoud measure and see what the height is.

Daniel · Post by **Daniel** » Mon Dec 10, 2012 5:35 am

if you post a photo of them i can tell just by looking at them if they are 8mm or 4mm domed

narfire · Post by **narfire** » Mon Dec 10, 2012 11:44 am

Ok have a pic of these Persan supposed 84.4mm pistons

Measured the skirt

Looks like 8mm domed pistons. I was going to use them in another engine build,but not in the works at the moment. perhaps later.
So these domed pistons are not the best for street use? I wanted more power but still drivable in traffic in a carb'd engine and after market cams ect...
Sorry for perhaps crowding your thred eh..
Chris

rodman · Post by **rodman** » Mon Dec 10, 2012 11:49 am

After reading this update what would be the appropriate compression and piston size to go with?

narfire · Post by **narfire** » Mon Dec 10, 2012 11:58 am

rodman wrote:After reading this update what would be the appropriate compression and piston size to go with?

Looking back in the posts, I could not find what engine you are planning to work on...Carb'd or FI?
Regardless, I was told by people that cubic inches helps make big power. So perhaps if you can source 84.8 or even 85 mm quality made pistons....

I have the 84.4 Mahle( they are flat top) in my FI with about 10 thou taken off a massaged FI head. I run 91 or 94 octane, no pinging to date with either fuel. Noticed a bit when I put 10 liters or so of 87 octane in last year to see what would happen.
Still waiting for my winning lottery ticket so another engine build is going to have to wait.
Chris

rodman · Post by **rodman** » Mon Dec 10, 2012 12:02 pm

It was FI but someone switch it over too a Carb setup before I got it.

Daniel · Post by **Daniel** » Mon Dec 10, 2012 3:58 pm

those are 8mm domed pistons

narfire · Post by **narfire** » Mon Dec 10, 2012 4:13 pm

Daniel wrote:those are 8mm domed pistons

Sorry to steal the thred again, but is milling a bit off the top possible? Reading this thred, sounds like unless I'm going racing, the 8mm pistons might be a bit much for a street motor. I don't want to be dealing with issues from really high compression.

Daniel · Post by **Daniel** » Mon Dec 10, 2012 4:18 pm

I've never tried it but thought of milling them down to lower the CR. what you could do is sell them and start over
buy the 4mm domed a much simpler solution imo.

rodman · Post by **rodman** » Mon Dec 10, 2012 4:19 pm

NAFIRE your fine I dont mind I want to race and drive on the street, if you plan on not using those 8mm pistons I can use them.

Daniel · Post by **Daniel** » Mon Dec 10, 2012 4:29 pm

wow that was fast lol

narfire · Post by **narfire** » Mon Dec 10, 2012 4:33 pm

PM sent

rodman · Post by **rodman** » Mon Dec 10, 2012 5:04 pm

if you were referring to me I have not gotten a pm

TulsaSpider · Post by **TulsaSpider** » Mon Dec 10, 2012 9:35 pm

I know that some people have shaved them down a bit to lower the CR

High performance motor build.

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