good budget freindly forged pistons?
08-06-2011, 04:27 PM
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good budget freindly forged pistons? I am looking for a good set of budget freindly set of forged pistons with rings for my stock c.i. ls1/ls6 block. I am wanting to keep or raise the stock compression ratio and something with moderate valve relief. Any sugestions?
08-07-2011, 06:07 AM
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Would these be able to just "drop in"?
http://www.summitracing.com/parts/PBP-14228-003/
What should i be looking for in the description of the piston for it be able to just "drop in"?
Bore (in) .?
Bore (mm) ?
Piston Style ?
Piston Material ?
Compression Distance (in) .?
Piston Head Volume (cc) ?
Wrist Pin Style ?
Pin Diameter (in) ?
Piston Ring Thickness ?
http://www.summitracing.com/parts/PBP-14228-003/
What should i be looking for in the description of the piston for it be able to just "drop in"?
Bore (in) .?
Bore (mm) ?
Piston Style ?
Piston Material ?
Compression Distance (in) .?
Piston Head Volume (cc) ?
Wrist Pin Style ?
Pin Diameter (in) ?
Piston Ring Thickness ?
Last edited by 6th gear; 08-07-2011 at 06:15 AM.
08-07-2011, 09:42 AM
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If you're wanting to use stock rods you'll need something with a .940 pin and a compression height for 6.098/6.100 rods. Also they would need to say 3.898 bore or so. I wouldn't recommend just "dropping in" a new set of pistons. You should take your block to a machine shop and let them hone it to proper size at a minimum. Also you are going to lose a little compression going to a flat top with reliefs just FYI. There's hardly any decent pistons options for the true stock bore size. Most are set up for 3.902/3.903/3.905 area. You might check and see what Mahle has if you truly just want to drop a set in.
08-07-2011, 04:09 PM
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What piston head volume(+/- cc) and style(flat,dome,dish) should i look for if i want up the compression?
Last edited by 6th gear; 08-07-2011 at 04:16 PM.
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08-08-2011, 09:50 AM
#8
or use thinner head gaskets (like .040 or .045 cometics)..stock are .056-.060"
The compression goes up when you reduce volume which is why the one fella
stated that using a piston w/reliefs will lower the compression.(the reliefs
usually ADD about 3-5 cc of volume)...Definitely have the block honed out
to 3.903 or 3.905 to start with a fresh bore when changing pistons/rings.
Also rebalance the crank since the weight of the new pistons will most likely
differ from stock(434grams)
08-08-2011, 06:47 PM
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Since the factory piston is flat w/no reliefs; you typically mill the heads and
or use thinner head gaskets (like .040 or .045 cometics)..stock are .056-.060"
The compression goes up when you reduce volume which is why the one fella
stated that using a piston w/reliefs will lower the compression.(the reliefs
usually ADD about 3-5 cc of volume)...Definitely have the block honed out
to 3.903 or 3.905 to start with a fresh bore when changing pistons/rings.
Also rebalance the crank since the weight of the new pistons will most likely
differ from stock(434grams)
or use thinner head gaskets (like .040 or .045 cometics)..stock are .056-.060"
The compression goes up when you reduce volume which is why the one fella
stated that using a piston w/reliefs will lower the compression.(the reliefs
usually ADD about 3-5 cc of volume)...Definitely have the block honed out
to 3.903 or 3.905 to start with a fresh bore when changing pistons/rings.
Also rebalance the crank since the weight of the new pistons will most likely
differ from stock(434grams)
I will also take the block in and have it honed out to a 3.905. I wish i could have it punched out to a 4.00. Thank you for your help!
08-08-2011, 07:42 PM
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-cc means it's dished or has valve reliefs so no you don't really want to look for pistons that have -cc's if you're wanting to bring the compression up. However, when you go forged, most pistons will at least have valve reliefs so you will mostly find -2.00cc or so. The bigger the -cc number, the bigger the dish.
08-09-2011, 11:05 AM
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Going to go with these pistons
http://www.summitracing.com/parts/MAN-592007-8/
They have a +4cc head volume so i think they will work great.
And these rods.
http://www.summitracing.com/parts/SCA-66100927A/
http://www.summitracing.com/parts/MAN-592007-8/
They have a +4cc head volume so i think they will work great.
And these rods.
http://www.summitracing.com/parts/SCA-66100927A/
08-09-2011, 05:51 PM
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Wont work, those pistons are .945 pin and the rods you chose are .927. For those prices you might as well get the Wiseco +12cc dome pistons and have some of the dome machined off to get the exact compression you want. And Compstar H-Beams, would be the same price basically. Also I don't think the Manley pistons come with the rings where the Wiseco's do. So it would probably be cheaper to go with the better Wiseco's anyways.
08-10-2011, 07:28 AM
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http://www.jegs.com/i/Mahle/644/LS13...oductId=757295
I also found these rods. Looks like there gonna work better.
http://www.summitracing.com/parts/SCA-66100945A/
