Schurters LT1

iTrader: (2)

What do people think of Diamond pistons

Pro's & Con's of a -22 dish piston

Is 8:5.1 to low for street driving , will the car be a dog down low...with
12+boost....

Pro Stock John

iTrader: (34)

Stock cubes?

Some manufacturers claim that 1.0 point drop of compression is a reduction of 3% of horsepower.

A 350/355ci LT1 guy is probably not going to notice a 1.5 drop in compresssion because (a) you have a V8 engine, (b) your combo might make big power as low as 4500-5000, and (c) Coming from say 375fwhp to 350fwhp is not noticeable for most.

I'm 8:1 now and with my setup, which is pulleyed for 18-20psi, Car is making a ton of power everywhere in the powerband.

blownZ

My car is 8.25:1 and I am driving it around without a blower right now. It feels perfectly fine on the street. Throttle response is the same as stock. I had the same heads and cam on my stock block, all I did was swap it out with an eagle crank, eagle rods, custom pistons. It feels like the difference between driving a car with a catback and driving a car with an open cutout. My motor makes more than enough power to get around town off boost, so why do I need any more power? When I crack that throttle and lean on it I want as much power as possible for driving aggressively, so I would gladly sacrifice 10-15 horsepower for driving around town for 90 or 100 RWHP on boost.

Pro Stock John

iTrader: (34)

Oh and I think Diamond pistons are pretty good, I am running a custom set of them to get to 8:1 compression with my 6.0 heads. I might be little higher than 8:1 because the heads have a clean up cut on them. I might be more around 8.2:1 cuz my 6.0 heads were 69cc.

Schurters LT1

iTrader: (2)

Hey Thx guys,
Is there any big deal to a deep dish piston, like the -22 dish,
yes this will be a 355 LT1+as much boost as i can on pump gas...

What rings are you using

NA$TY-TA

iTrader: (21)

Im running Diamond -15cc dish pistons with a Dart Ceramic coating on them. With my 6.0L heads with there 71cc chambers and my MLS gaskets im around 8.8:1 comp. On motor its ok but on boost its a total different story........ you will be just fine.
Oh... im using Pro Select File fit rings.
Kyle

n2oblkz

iTrader: (1)

I am building a 357 ci LT1 for forced induction. I have a 4340 forged Cola crankshaft along with forged Manley H beam rods. The Diamond Blower -22cc dish piston is the piston that I am going to use with my AFR LT4 210cc heads. I searched around about the piston and was going to use the JE blower piston but found that Diamond also made a blower piston at about $100.00 to $150.00 cheaper. From what I hear, Diamond's are very good pistons. The -22cc Diamond is the same piston that Speed Inc. is using in their 357 ci 1996 LT1 ss twin turbo car that makes 847RWHP and 847RWTQ. When I called them about this piston, I think that they said that they are running 20 to 25 PSI with this piston without any problems, so it must be durable. I am planning on running only about 15 to 18 PSI and my heads are bare right now so when I have them ported out, I am going with 64CC chambers to give me about 8.5 to 1 compression, which will be good for a lot of boost. Of course, I am studding everything and I am probably going to use Speedpro's Hellfire ring's, just to be safe. Good luck!

Schurters LT1

iTrader: (2)

Very nice set up...cool good to here on the pistonsLooks like it is going to be diamond pistons for this set...

Why hell fire rings, yes they are the best but , are they not harder on cyl walls

n2oblkz

iTrader: (1)

I hear that they are but I am not sure on that yet. I am going to check with Speed Pro and some engine builders to see if it is true. For a forced induction engine, from what I understand, the Hellfire rings are about as durable as you can get. I only put about 300 to 400 miles on my car a year, it is a garage baby, so I can't see that it would make that nuch difference. If it was going to be a daily driver, I probabaly wouldn't go with the Hellfire's, but we'll see. I just want to build the engine to withstand more boost than I am going to throw at it. Once I get it a good tune, I don't want to have to worry about it and just drive it and have fun.

Schurters LT1

iTrader: (2)

Well i drive about 8000km a year so ..i don't want to kill my cyl wall with these ring yes thay are the best but in a DD car???

what other brand of rings are out there is are very good

n2oblkz

iTrader: (1)

I think that a lot of the guys are running the plasma molly rings and having very good luck with them.

Schurters LT1

iTrader: (2)

How much boost/heat can the plasma molly rings take what gap should they be set at

Jammer

iTrader: (1)

Im on -26 cc dish diamonds...fine 4 me.

n2oblkz

iTrader: (1)

That I don't have an answer to, that it is getting a little too technical for me. You may want to email someone like APE or HPE to get some guidence from them. They have a lot of experience building forced inducted engines.

Chris@AP-Engineering

iTrader: (-2)

Shoot me a email with questions about the Diamond Pistons line. I am the guy responsible for their LS1 line up and also had a lot of imput with the SBC stuff too. Let me know if you have any questions.

Thanks