What do you guys think of these pistons?

[BlackRat]

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2438994584

The compression is high for the 100 & 109 cc heads so I figure I could go with the Edelbrock or GMPP 119cc which will give me 10.22:1.

The Cam is a CC xtreme solid grind XS282S-10

I will not be running N2O and have a goal HP and RPM of 500\6k. What do you guys think of these and have you ever purchased anything from Mad Dog racing on ebay?

Thanks
Wade

 

[ShakeRattleRoll]

Nice but No

The comp will still be a little high for gas they sell now. But if you want to add some additive or purchase race fuel and mix it from 55 gal drums then go for it. But before installing them. Take a rubber deburing tool that goes into a high speed grinder or you might think of it as a dremal and round off all sharp edges and debur. That way you will not have any high spots that might cause pinging or detonation which is caused by a hot spot.

 

[BlackRat]

They have some lower compression packages that I can look at that would yeild around 9.8:1. I am really more concearned with the quality of the pistons themselves. Are the Speed Pro Hypers as good as the KB's? Has anyone else used them? I am thinking that from what I have read about hypereuetics they are good for 500+ and eliminate piston rock usually experienced with forged. Not to mention the price is about half of forged. If I am not running N2O just wandering if these are worth while to pursue.

Thanks
Wade

 

[AKRAY4PLAY]

speed pro and je are the onlt pistons i will buy. you have to balance your comp ratio with the heads, aluminum or steel. rule of thumb is 10.0:1 steel and 11:1 aluminum is the max. the main thing to look for is valve to piston clearence when going with dome pistons. the cam selection becomes very important in this equation. other than that, speed pro is good, Brian

 

[ShakeRattleRoll]

Pistons )

Speed Pro is a very good brand to go with. hypereuetics are a very good middle of the ground piston set. I myself would stick with two relief flat top pistons instead of the pop ups and stay at the 9.8 to 9.5 area but you can change that a little by using differant thickness's of head gaskets. And you are right for what you are doing the added cost of forged is not needed. But on a good note the new type of forged pistons have a much higher percentage of silicon in them to minimize the expansion of the piston requiring less clearance between the cylender and the piston. Just some more not needed info lol. For what you are doing a standard two bolt main block is fine along with a standard cast crank as well and the use of the stock rods are fine also just use quality rod bolts and it would not hurt to have the rods polished and shotpeened.

 

[BlackRat]

Thanks guys I appreciate the info! I will look into the hyper flat top version. I am going to be running the aluminum heads from either GMPP or Edelbrock and I can go with either 100,106 or 119 cc versions. I just want to make sure that I put quality parts in the motor but don't want to overkill. The cam that I am looking at is a solid with .595 lift and set at a 110 lobe center. Flat top one definately give me more valve to piston clearence.

Thanks
Wade