Why not oem pistons
#2
I never narc'd on nobody!
iTrader: (1)
Re: Why not oem pistons
OEM pistons are cast. Aftermarket pistons are forged. OEM pistons have ring lands made out of tin cans. Aftermarket pistons have ring lands that are made out of real metal, with real thickness to them that won't cry at the first sign of a hard time. This is all really basic stuff you could have found out using Google.
#3
Man U FTW
Re: Why not oem pistons
The main advantage of non-OEM Honda pistons is that the ringlands will stay attached to the piston, rather than ending up in the oil pan. Basically, forged pistons can take more abuse than a cast piston without catastrophic failure.
Blown Ringland Pic
Blown Ringland Pic
#5
Honda-Tech Member
Re: Why not oem pistons
We used to pound oem pistons in B and H motors and never broke any in the 3-400whp range. Nowadays where 500-1000 is the norm, nobody uses them. I would still run oe pistons in mild street builds with no worries.
#6
Honda-Tech Member
Join Date: Aug 2003
Location: fresno / merced, ca
Posts: 1,963
Likes: 0
Received 0 Likes
on
0 Posts
#11
Re: Why not oem pistons
Vitaras are nice because of the T6 heat process that makes them stronger. Stock rods on a D15/16 is only like 220-250whp, Most kits for Vitaras are fairly cheap and most give a compression of like 8.5:1.
#13
Re: Why not oem pistons
I'm not sure but this 8:5:1 is very close to the stock engine compression for a D16Z6. What are the advantages in using a stock length forged rod than a shorter one in a turbo set up?
#14
I never narc'd on nobody!
iTrader: (1)
Re: Why not oem pistons
8.5:1 is not "very close" to 9.2:1. It's nearly a point off. The correct question for your question is "what are the disadvantages of running a shorter rod", and that's a pretty long list. Reducing compression reduces volumetric efficiency, which means less power and poorer gas mileage. Changing the rod length ***** with the rod:stroke ratio, which also negatively affects your powerband, VE, and MPGs. It has literally zero advantages, and multiple HUGE disadvantages. There's no reason to do it.
#15
Re: Why not oem pistons
stock rod length= 7.5:1 custom length = 8.5:1. I like Vitaras for cheap "builds" or "Street" cars, but yes low compression has its downside. It also has some welcome benefits likes, Like forgiveness being one of the biggest. I have had both low and "high" compression turbo builds, yes the high compression was nice, but for triple the price it did hurt the wallet a little more.
#16
Honda-Tech Member
Join Date: Feb 2003
Location: schooling kids in ny, usa
Posts: 9,813
Likes: 0
Received 9 Likes
on
9 Posts
Re: Why not oem pistons
8.5:1 is not "very close" to 9.2:1. It's nearly a point off. The correct question for your question is "what are the disadvantages of running a shorter rod", and that's a pretty long list. Reducing compression reduces volumetric efficiency, which means less power and poorer gas mileage. Changing the rod length ***** with the rod:stroke ratio, which also negatively affects your powerband, VE, and MPGs. It has literally zero advantages, and multiple HUGE disadvantages. There's no reason to do it.
Ive done it and all I can say is 7.8:1 is ******* horrid. You have drive around at like 8" everywhere u go cuz it makes no power outside of boost even with more timing. I waas barely getting 28mpg and get low 30s with my 2 liter gsr turbo. It made 240whp @14 psi with a saab td05 15t went mid 13s @105 but was certainly a dog around town. I put 12k miles on it that year.
Ok now all said and some may disagree but im going to use the nippon turbo b series pistons/ stock rods w/ arps to make a very reliable 300-350whp at some point in the next few years. I think they are a shade under 9:1 and can get mid 9's with some milling
#17
Honda-Tech Member
Join Date: May 2008
Location: Southern Oregon
Posts: 1,892
Likes: 0
Received 0 Likes
on
0 Posts
Re: Why not oem pistons
Ive done it and all I can say is 7.8:1 is ******* horrid. You have drive around at like 8" everywhere u go cuz it makes no power outside of boost even with more timing. I waas barely getting 28mpg and get low 30s with my 2 liter gsr turbo. It made 240whp @14 psi with a saab td05 15t went mid 13s @105 but was certainly a dog around town. I put 12k miles on it that year.
Ok now all said and some may disagree but im going to use the nippon turbo b series pistons/ stock rods w/ arps to make a very reliable 300-350whp at some point in the next few years. I think they are a shade under 9:1 and can get mid 9's with some milling
Ok now all said and some may disagree but im going to use the nippon turbo b series pistons/ stock rods w/ arps to make a very reliable 300-350whp at some point in the next few years. I think they are a shade under 9:1 and can get mid 9's with some milling
What I'm curious about is the power limits of the stock LS rods, particularly the torque limit since the shitty flow of the LS head makes more torque to HP vs a vtec head. I'm gonna get my car on a dyno soon and push the power to around 350whp and I assume about 300 or more torque.
Last edited by boosted94gsr; 11-18-2014 at 10:14 AM.
#18
Honda-Tech Member
Join Date: Feb 2003
Location: schooling kids in ny, usa
Posts: 9,813
Likes: 0
Received 9 Likes
on
9 Posts
Re: Why not oem pistons
thats it right there man! if you are doing an 81.5mm build or if the pistons need replacing even at 81mm for whatever reason there is no reason to put oem back in there if you ask me.
Thread
Thread Starter
Forum
Replies
Last Post
92integraVTECgsr
All Motor / Naturally Aspirated
26
02-15-2007 03:06 PM