D16 Pistons?
10-16-2004, 04:28 PM
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D16 Pistons?
What pistons have been found to work well for the D16's in H4? How much are you actually boring these to keep the engine reliable and actually be able to find a piston that will work?
10-16-2004, 05:20 PM
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Re: D16 Pistons? (Mattamotor)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mattamotor »</TD></TR><TR><TD CLASS="quote">last time i check stock pistons were the only thing allowed in H4. </TD></TR></TABLE>
Not true, read the rulebook. Same goes for IT. Yes they must be "stock" but you could get creative if you wanted to.
Not true, read the rulebook. Same goes for IT. Yes they must be "stock" but you could get creative if you wanted to.
10-16-2004, 05:29 PM
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Re: D16 Pistons? (rice_classic)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rice_classic »</TD></TR><TR><TD CLASS="quote">Doesn't honda make .20 over pistons?... Wouldn't that be "stock"?</TD></TR></TABLE>
What if you wanted to go .040" over? See where this goes....
What if you wanted to go .040" over? See where this goes....
10-16-2004, 05:29 PM
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Re: D16 Pistons? (rice_classic)
There are stock Honda and stock dimesioned aftermarket overbore piston available.
If anyone needs any used stock D16A6 pistons, I seem to have amassed a pretty decent selection of them. Make an offer.
If anyone needs any used stock D16A6 pistons, I seem to have amassed a pretty decent selection of them. Make an offer.
10-16-2004, 05:31 PM
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Re: D16 Pistons? (rice_classic)
As long as the pistons have the same characteristics other then bore it is legal.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mattamotor »</TD></TR><TR><TD CLASS="quote">last time i check stock pistons were the only thing allowed in H4. H1 allows any stock pistons.</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mattamotor »</TD></TR><TR><TD CLASS="quote">last time i check stock pistons were the only thing allowed in H4. H1 allows any stock pistons.</TD></TR></TABLE>
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10-16-2004, 05:33 PM
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Re: D16 Pistons? (CRX Lee)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CRX Lee »</TD></TR><TR><TD CLASS="quote">There are stock Honda and stock dimesioned aftermarket overbore piston available.
If anyone needs any used stock D16A6 pistons, I seem to have amassed a pretty decent selection of them. Make an offer.</TD></TR></TABLE>
Honda only has .20 and .50, but not .040
edit: -Danny who was too tired to realize what he typed before.
Modified by DMF at 1:16 AM 10/17/2004
If anyone needs any used stock D16A6 pistons, I seem to have amassed a pretty decent selection of them. Make an offer.</TD></TR></TABLE>
Honda only has .20 and .50, but not .040
edit: -Danny who was too tired to realize what he typed before.
Modified by DMF at 1:16 AM 10/17/2004
10-16-2004, 07:44 PM
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Re: D16 Pistons? (DMF)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DMF »</TD></TR><TR><TD CLASS="quote">
Honda only has .020 and .050, but not .040</TD></TR></TABLE>
That's .20 and .50 mm or ~ .007 and .019"
Honda only has .020 and .050, but not .040</TD></TR></TABLE>
That's .20 and .50 mm or ~ .007 and .019"
10-16-2004, 08:37 PM
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Re: D16 Pistons? (jsi)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jsi »</TD></TR><TR><TD CLASS="quote">
That's .20 and .50 mm or ~ .007 and .019"</TD></TR></TABLE>
Really? So the .5mm pistons are like way shy of what is legal for ITA?
....and I was under the impression that Honda offered a .25 or a .5 overbore.....
So it would be .009 for the .25mm, and .019 for the .5mm overbores.
Hmmm, I wonder if the .040 custom pistons are the way to go here.....wonder how much more power you can really make with them?
That's .20 and .50 mm or ~ .007 and .019"</TD></TR></TABLE>
Really? So the .5mm pistons are like way shy of what is legal for ITA?
....and I was under the impression that Honda offered a .25 or a .5 overbore.....
So it would be .009 for the .25mm, and .019 for the .5mm overbores.
Hmmm, I wonder if the .040 custom pistons are the way to go here.....wonder how much more power you can really make with them?
10-16-2004, 10:24 PM
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Re: D16 Pistons? (jisu009)
Yes, it's .25 and .50 mm, (not .20). Just looked it up in the shop manual. 75mm stock, 75.25 or 75.50 oversize. So a .040" would be about 1mm oversize or 76mm.
10-17-2004, 05:04 AM
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Re: D16 Pistons? (jisu009)
Displacement using 90mm stroke and bore of :
Stock 75mm = 1590cc
+.25mm = 1601cc
+.50mm = 1612cc
+1.02mm (.040") = 1634cc
So a .040 over gives an increase of 44cc in total displacement or about 2.8% over stock, so about 1.4% more than .50mm. Maybe a couple of horsepower gained. Benefit vs. cost is low but i imagine it would be worth it for a front-running car that's maxed out to the rules.
Modified by jsi at 9:18 AM 10/17/2004
Stock 75mm = 1590cc
+.25mm = 1601cc
+.50mm = 1612cc
+1.02mm (.040") = 1634cc
So a .040 over gives an increase of 44cc in total displacement or about 2.8% over stock, so about 1.4% more than .50mm. Maybe a couple of horsepower gained. Benefit vs. cost is low but i imagine it would be worth it for a front-running car that's maxed out to the rules.
Modified by jsi at 9:18 AM 10/17/2004
10-17-2004, 02:31 PM
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Re: D16 Pistons? (jsi)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jsi »</TD></TR><TR><TD CLASS="quote">Displacement using 90mm stroke and bore of :
Stock 75mm = 1590cc
+.25mm = 1601cc
+.50mm = 1612cc
+1.02mm (.040") = 1634cc
So a .040 over gives an increase of 44cc in total displacement or about 2.8% over stock, so about 1.4% more than .50mm. Maybe a couple of horsepower gained. Benefit vs. cost is low but i imagine it would be worth it for a front-running car that's maxed out to the rules.
</TD></TR></TABLE>
Also just to add to that...
.010" = .05:1 increase
.020" = .1:1 increase
.040" = .2:1 increase
So in an ITA CRX/Civic Si w/ a D16A6 An increase of 44cc and .2:1 compression could be the difference in a front running car. Who knows. If you want to build the car to the maximum allowed by the rules.
If you are a front running sponsored car, with at least one spare engine no biggie, but if you aren't and that engine goes and scars the cylinder walls badly enough, back to the junk yard.
Stock 75mm = 1590cc
+.25mm = 1601cc
+.50mm = 1612cc
+1.02mm (.040") = 1634cc
So a .040 over gives an increase of 44cc in total displacement or about 2.8% over stock, so about 1.4% more than .50mm. Maybe a couple of horsepower gained. Benefit vs. cost is low but i imagine it would be worth it for a front-running car that's maxed out to the rules.
</TD></TR></TABLE>Also just to add to that...
.010" = .05:1 increase
.020" = .1:1 increase
.040" = .2:1 increase
So in an ITA CRX/Civic Si w/ a D16A6 An increase of 44cc and .2:1 compression could be the difference in a front running car. Who knows. If you want to build the car to the maximum allowed by the rules.
If you are a front running sponsored car, with at least one spare engine no biggie, but if you aren't and that engine goes and scars the cylinder walls badly enough, back to the junk yard.
10-17-2004, 03:56 PM
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Re: D16 Pistons? (Mr Hammond)
I would be concerned with the cost of the .040 pistons more then the cost of a D16A6 block......
The blocks are a dime a dozen....
I think it all comes down to cost vs. hp on this one.
Anyone know how much the .040 overbore pistons are?
The blocks are a dime a dozen....
I think it all comes down to cost vs. hp on this one.
Anyone know how much the .040 overbore pistons are?
10-17-2004, 07:04 PM
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Re: D16 Pistons? (DMF)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DMF »</TD></TR><TR><TD CLASS="quote">As long as the pistons have the same characteristics other then bore it is legal.
</TD></TR></TABLE>
Heh, I told you they were legal
</TD></TR></TABLE>
Heh, I told you they were legal
10-18-2004, 03:16 AM
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Re: D16 Pistons? (jisu009)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jisu009 »</TD></TR><TR><TD CLASS="quote">Anyone know how much the .040 overbore pistons are?</TD></TR></TABLE>
I wouldn't think terribly expensive. Less then forged pistons. I mean after all they are just basic cast pistons.
RS Machines was making 81.50mm ITR pistons for a while there and they weren't all that more expensive if at all then OEM.
I wouldn't think terribly expensive. Less then forged pistons. I mean after all they are just basic cast pistons.
RS Machines was making 81.50mm ITR pistons for a while there and they weren't all that more expensive if at all then OEM.
10-18-2004, 06:18 AM
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I got a set of .040over pistons for my ITA crx from my sponsor, a Piston Ring Auto Value shop. They sell "aftermarket" oem spec parts, etc. They were damn cheap
PM or email me for more info if you like
PM or email me for more info if you like
10-18-2004, 06:46 AM
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Re: (Chris Sawatsky)
http://www.importperformanceparts.net
they have .020 over and .040 over OEM spec pistons. i think a set of pistons was like $100 or close to it. good deal. i think that's less than honda charges.
s
they have .020 over and .040 over OEM spec pistons. i think a set of pistons was like $100 or close to it. good deal. i think that's less than honda charges.
s
10-18-2004, 08:18 AM
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Re: (stevel)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by stevel »</TD></TR><TR><TD CLASS="quote">
they have .020 over and .040 over OEM spec pistons. i think a set of pistons was like $100 or close to it. good deal.
</TD></TR></TABLE>
That is about what I paid for my .040 over aftermarket replacement pistons for my F Prod limited prep race engine. The class allows only about 0.5 to 1 increase in compresssion so there was not much reason to go elsewhere. I have a digital that reads to 1/100th of a gram from a soils lab so I can static balance the pistons, wrist pins and rods myself for onlyn the investment of a c ouple hours of hand work.
they have .020 over and .040 over OEM spec pistons. i think a set of pistons was like $100 or close to it. good deal.
</TD></TR></TABLE>
That is about what I paid for my .040 over aftermarket replacement pistons for my F Prod limited prep race engine. The class allows only about 0.5 to 1 increase in compresssion so there was not much reason to go elsewhere. I have a digital that reads to 1/100th of a gram from a soils lab so I can static balance the pistons, wrist pins and rods myself for onlyn the investment of a c ouple hours of hand work.
10-18-2004, 08:50 AM
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Re: D16 Pistons? (DMF)
We always ran the Honda pistons (~0.02 over) in the CRX for the better reliability and were also able to keep up with the other 0.04 overbored CRXs that we have encountered. I would be really curious to know the actual power difference a 0.04 overbore actually makes, given everything else equal. There are just plenty of other areas (both car and driver) where a lot more significant speed can be picked up without sacrificing reliability, than using aftermarket 0.04 pistons. But if you can afford to rebuild you bottom end more often and also source up another block every time you do it, then I would say go ahead and use aftermarket 0.040 over pistons. Good luck.
10-18-2004, 03:51 PM
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Re: D16 Pistons? (Hracer)
i have some new *i think* OEM .50mm = .02in overbore D16Z6 pistons for sale, just put them up on ebay... $50 starting bid http://cgi.ebay.com/ebaymotors...42627
12-28-2004, 03:07 PM
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Re: D16 Pistons? (blackcivic44)
BACK FROM THE DEAD
I finally got my pistons today. I ended up getting Topline pistons with a .040 over bore. These cost $120 for t set with rings and pins. Can't beat that if you ask me. So for people looking for .040 pistons Topline DOES make them with stock characteristics.
My car dynoed at 124 whp before the build. I will post what my new numbers are after the engine is re-built, just for those people wondering what a .040 piston will actually do. I know i'm intersted to see.
I finally got my pistons today. I ended up getting Topline pistons with a .040 over bore. These cost $120 for t set with rings and pins. Can't beat that if you ask me. So for people looking for .040 pistons Topline DOES make them with stock characteristics.
My car dynoed at 124 whp before the build. I will post what my new numbers are after the engine is re-built, just for those people wondering what a .040 piston will actually do. I know i'm intersted to see.
12-28-2004, 03:56 PM
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Re: D16 Pistons? (Chris F)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris F »</TD></TR><TR><TD CLASS="quote">I'll wager you picked up 3.5 HP! 
Let us know how the dyno goes. </TD></TR></TABLE>
Don't forget about the extra half a point of compression I can get. Maybe 4 hp total ....
Please don't remind me what a dumb *** I am for building a H4 engine to the exact rule book. I can't believe I am waisting this much money for a 130 whp engine..
Let us know how the dyno goes. </TD></TR></TABLE>Don't forget about the extra half a point of compression I can get. Maybe 4 hp total
....Please don't remind me what a dumb *** I am for building a H4 engine to the exact rule book. I can't believe I am waisting this much money for a 130 whp engine..