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what pistons will be better

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hondaslayer1

10+ Year Contributor
407
1
Nov 1, 2009
waukegan, Illinois
i have a 6 bolt block and have the big 1g rods and need to know what pistons would be best to hold 400hp or so.the pistons that are on the rods are junk so i need to get a new ones.
 
Get yourself some 2g pistons from NPR. They are high quality and don't break your wallet. All you gotta do is get the small end machined at a shop (20 ~ 40$, maybe 60 tops) and you'll have quite a good combo. I got my NPR Pistons & Rings for about 80$.
 
I would just spend the extra cash for some weisco or mahle pistons, i would be skeptical of how long the npr's would last under 400 whp on an awd. Thats a substanial amount of hp when oyu consider drivetrain loss. Not saying people haven't done it, but would risk it for the minor price difference. Also the weisco's will allow more adjustability in compression ratio depending on your overall set up from your goal and listed mods i would ###### go 8:3:1.

Secondly i don't know about there, but here in mn where i live it would cost more that 60 dollars in machine work for sure to have the rods fit for 2g pistons.
 
The cost of having the rods resized, fitted with arp's, and machined for the 2g pistons, along with the price of 2g pistons, is only slightly cheaper than a set of forged rods and pistons. It was a good setup back in the day. But, there are very affordable options out there now.
 
^k...where can I get aftermarket pistons that come with rings for under 100 shipped to my door? I think the 2g pistons on 1g rods have more than proven themselves reliable for 400whp dd.
 
I would completely disagree with that, yea people do it, but also alot of people have issues, i mean even weisco's rated to 500 fail sometimes in the mid 400 range. I'm not going to ask people to respond cause everyone tells the story of their buddy or exaggerate, but i doubt there are too many people with good leakdown numbers, if even a running veicle that have made it over 30k miles with any type of aggressive driving and occasional track days putting down over 400whp.
I will say, that if someone asked whats the most i can put down on a stock bottom end relatively safely, i would say 400, but at the point of replacing them why wouldn't you just do it right, than risk it.

Also i guess no one asked, but why is he replacing them? Not sure you tech level honda slayer, but depending on why you are doing this odds are you will need some machine work. Figure head mill, block deck, at least a hone if he doesn't need to bore, which if he does then he needs oversized pistons, new bearings etc. The extra 230 bucks for forged pistons vs pistons and machine work is the last thing he will likely be worring about.
 
I guess I'm more value oriented, not meaning to step on your feet either. If money isn't an objection and he budgeted 300 ~ 400$ for pistons screw the 2g ones. I guess it's just hard to get out of penny pinching mode.
 
If the pistons are junk the cylinders probably aren't looking fabulous either.

Don't be another guy who spends the minimum 3x because he doesn't want to make the initial investment.

If the cylinders aren't perfect, bore it out, throw any decent forged piston in it (Ross, wiseco, etc) with a set of eagle rods and enjoy.

Bulletproof for 400+ daily for years to come.
 
I agree with the bottom post except if you already have a 6 bolt block just have the machine shop spec them and if they are fine looking for the power you are and with budget an issue you can ###### just slide with the 1g big rods and forged pistons.
 
How well your pistons hold up & how long they last in my opinion has a lot to do with HOW WELL your engine is TUNED. No piston will hold up to an engine running lean all the time or knocking but a forged piston will live longer under these conditions. In a well tuned engine cast pistons have been known to hold up very well while making decent horsepower in all makes & models of engines. Remember that forged pistons require more piston to wall clearance which can sacrifice longevity vs a cast piston requiring less clearance and actually a better choice for daily driven vehicles. I really don't think 400 crank horsepower on cast pistons is asking too much so long as you have a decent tune.
Good luck
 
i am not trying to run a solid 400 hp to the wheels i want that for fun at a track. i want to have a dd with a goal around 350 hp to drive around town and 400 or so for balls to the wall fun at a track.why do u guys say u can use a forged piston on a stock rod. i have heard that u cant do that. i dont want a all forged block it cost way to much. the rods where from another block and the block is going to get bored out for bigger pistons.
 
You can use forged pistons on stock rods, but it requires a modification to the rod. Your machinist will have to bore the small end of the rod and install a bronze bushing, and dril an oiling hole for proper lubrication.

Your cheapest option is to get 2g pistons and have the machinst bore the small end of the rod to the proper size. He will need to have the wirst pins to do this correctly.
 
The factory 1g pistons have a lower compression ratio (7.8:1) than then 2g pistons (8.5:1).

Yes you can use forged pistons on the 6 bolt rods. Thats what I'm using in my build, 8.3:1 Weiscos on the factory 6 bolt rods with ARP bolts.

Hope this helps!
 
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