Flat top pistons vs Dished pistons

[fiveohcrazy]

My questions are:

Does a dished piston do anything else besides lower compression?

Can a forged Flat top piston be used in a boosted application efficiently if the compression ratio is correct?

Which piston is less likely to have detonation issues in a turbo application and why?


any input is greatly appreciated!

 

[Billydroveit]

My questions are:

Does a dished piston do anything else besides lower compression?

Can a forged Flat top piston be used in a boosted application efficiently if the compression ratio is correct?

Which piston is less likely to have detonation issues in a turbo application and why?


any input is greatly appreciated!

Detonation will depend on the tune for these applications. If you detonate on these pistons there was a place where a hot spot could form.....shrap edge or finish not being right. Other than that detonation come from the tune not the pistons. for me i would use a dish if i could though. it helps keep the combustion process in the middle of the piston and reduces the amount of side load. (this is just myopinion and i have no data to support it) But in all honesty if the tune and supporting equipment are the same in both situations, i see no real difference in using either.

 

[sofa king]

I get what you are saying, and I also wondered this same stuff and went through how to lower compression.
Basically either way will work, although some guys that I have spoken with who did a lot of OEM development explained that it is better to go with a flat top piston and run a bigger chamber in the head. I do OEM development work, just not in hardware. It sounds like if you put the plug in the head with the right depth, the flame front will travel better across a flat top because it in not going into the hole, but burning up in the head. Blah, its been a few years, I can't remember everything that I was told. But the cost of pistons was much less than the cost of selling a good set of heads which i already had and buying another set of heads and trying to go with a bigger chamber...
As mentioned above though, hot spots and shitty tuning will detonate, bad fuel, many factors, but as far as hardware, I don't think either way is going to be worse than the other...

 

[fiveohcrazy]

I get what you are saying, and I also wondered this same stuff and went through how to lower compression.
Basically either way will work, although some guys that I have spoken with who did a lot of OEM development explained that it is better to go with a flat top piston and run a bigger chamber in the head. I do OEM development work, just not in hardware. It sounds like if you put the plug in the head with the right depth, the flame front will travel better across a flat top because it in not going into the hole, but burning up in the head. Blah, its been a few years, I can't remember everything that I was told. But the cost of pistons was much less than the cost of selling a good set of heads which i already had and buying another set of heads and trying to go with a bigger chamber...
As mentioned above though, hot spots and shitty tuning will detonate, bad fuel, many factors, but as far as hardware, I don't think either way is going to be worse than the other...

I just heard the same thing from a Very good source. I'm going with a flat top piston and a 72cc head........ Thanks!