I have my old stock block I started with that needs parts for n/a,mild boost on the street so I got new stuff for the race block.I have been using wiseco so I will have them make a custom full dish set to replace the flat tops.I got Callies procomp rods and a new Eagle crank that will need another keyway and balanced once I get the pistons.

Sounds like a solid platform

No to the full dish, use a D-shaped dish or reverse dome so if you now or later use a head with a squish area it can work.

www.theoldone.com Somewhere in there he talks about using a supercharger on an 11.3:1 engine, something like that. If you have good combustion chamber dynamics, the engine's octane requirements go down.

R.

A full dish works great with my friends LS turbo,I have Edl victor heads now.

I also had good luck with my open chamber 95cc iron heads that to the piston was .200"

Not a lover of Eagle products but I wish you luck.

Is there a technical point to your opinion?

Eagle is one of two companies that I have had bad experiences with quality wise on engines (assemblies) that I have assembled for myself and Friends. As with all race products check to over carefully which includes testing the convertor hub in the back of the crank and taper.

Sounds like good info thanks.

The vert is very loose in the crank.I test fit the rods on the crank as a quick check and I will order pistons tomorrow.The engine shop will do final check,balance.I used some gear 140 oil on the rod check here.
https://www.youtube.com/watch?v=mHHTBMBr58c

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If your starting from scratch and you can get the comp low enough where you want it, absolutely the reverse dome or the D dish.

Sure the full dish works, but the other has been proven to work so much better. Better more efficient combustion chamber, less chance of detonation, more HP etc. So why wouldn't you? Do it, IMO, it cant be that much more expensive.

I did not see that info about a boosted engine and what you say seems a bit exaggerated to me.Maybe in a n/a.

Don't take it personally I had good results with a big chamber.

Its definitely not going to hurt you. You may benefit the most from the more resistance to detonation. Boosted engines can use all the help they can in that department, as boost is already heating up the mixture to begin with increasing the earlier onset of detonation.

I wouldn't just flat rule out the reverse dome or D dish until you look into it a little more.


Also what kind of supercharger do you have. Some are a lot worse then others for producing heat. I think the Eaton type have been nicknamed by some Heaters, for the excess heat they produce.

The whipple superchargers have a design where the compressors blow straight down though into the intake vs The Eatons forcing the air out and around the the inside of the blowers body taking a longer sharper turning path of the charge creating more heat.

I have an A/W intercooler.

That's good about the cooler. Saw some of your prior posts.

1. Your flat tops did show some signs of detonation from the pics and in your own words. Good move on getting the new intercooler vs your other intercooler.

2. Saw you had a smoking deal on some Diamonds?? I guess your not going to use them, because your going to order Custom pistons tomorrow, stated in this post???.

If your getting a deal on some dish diamonds use them you will be fine, you can make power with boost with pistons .300 down the hole.

But if you really are going to pull the trigger tomorrow on some Custom pistons, Id go with the D,s with quench, hands down.

But, it will run too with a dish. But The benefits of Quench and a efficient combustion chamber doesn't care if the motor is Boosted or NA.

I hope you don't take this personal, either, I don't. I hope I didn't say to much.

The outer ring of the dish will be .075 from the head and the base of the dish .200 and I am getting my pistons from wiseco just 35 miles away.The piston will be the same from what I have just a dish will be the only change.Thank you for explaining your reasoning on quench.I will let you know how things workout.

another option is to angle cut the dish on 1/2 the dish like softening the chamber but on the piston.I read that a 7* works good.

If your ordering custom pistons I'd have them build the best thing they have. They should coat them on the top after they soften them..

So its a basically a D Dish with the flat quench part on a 7* down angle till it meets the full dish?? That sounds ok to me.

Wiseco can do amazing things with there piston design abilities.

From the pics on their website, they can machine any shape piston top you desire.