New piston suggestions and valves

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New piston suggestions and valves

Post  BigRigTech on October 19th 2013, 10:43 pm

I'm having my bottom end balanced this winter and I want to switch from Hyper to forged pistons. Right now I have KB single valve relief flat tops the D2PI heads that cc'd at 91 giving me about 10:1 compression. D1 block bored .040 over and it will likely need to go .060 over as he just honed it last time with a 2YABC crank and forged eagle H-beams. My question is: Should I or can I get "pop up" pistons to gain some more compression while I'm in there? Right now I'm using a 50/50 mix of 91 octane and AV gas. If I'm going to spend the money for new slugs I might as well maximize the bang for my buck.Very Happy

I'm also going to do some mild head porting and put in SS valves....Should I go with stock or under cut stems?
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Re: New piston suggestions and valves

Post  LivermoreDave on October 20th 2013, 8:52 am

Since you ask and it's a drag race only ride, I'd compress it up! I like undercut stems or smaller stems and stainless valves will be fine given engine speed doesn't spend much time above 7000 rpm.

Just my opinion,
Dave.

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Re: New piston suggestions and valves

Post  BigRigTech on October 20th 2013, 9:11 am

In the best air of the season I was hitting the 6400 pill right at the stripe. That was with the new 3.89 gears. I was hitting the 6600 pill in July with the 4.11's in horrible air. I swapped the gears to bring my stripe rpm closer to my peak hp on the dyno - which was 5600rpm. I hit the stripe at 6000 now in bad air. I had my best 60ft ever with the 3.89's two weeks ago at the final race of the season, a 1.50 on a cold track.
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Re: New piston suggestions and valves

Post  BigRigTech on October 28th 2013, 12:47 pm

I'm not finding much in forged dome pistons for a stock D2PI head deal with a stock 3.85 stroke....Question Anyone here know of any?
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Re: New piston suggestions and valves

Post  bluef100fe on October 28th 2013, 2:08 pm

I believe cars by carl had some batches of stock stroke dome piston stuff made... otherwise there's the Trw L2443's? They have a large dome but are heavy.. they have been around forever... good luck
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Re: New piston suggestions and valves

Post  BigRigTech on October 28th 2013, 2:09 pm

I guess I should email him. Thanks.
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