D Series piston project update...the contenders so far. (lots of pics...beware 56k)
#1
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D Series piston project update...the contenders so far. (lots of pics...beware 56k)
Hi All:
So far, I have 6 different D series pistons to work with. I have almost every piston from 1.6 liter engines. I think I'm missing one from the 96+ Civic HX, but nobody has that car.
Here are the contenders so far:
I've measured the P29 and PM7 pistons in several ways and as far as I can tell, they are exactly the same. I wonder why Honda made 2 different part numbers and castings for the same piston? Hmmm...
Sonny
So far, I have 6 different D series pistons to work with. I have almost every piston from 1.6 liter engines. I think I'm missing one from the 96+ Civic HX, but nobody has that car.
Here are the contenders so far:
I've measured the P29 and PM7 pistons in several ways and as far as I can tell, they are exactly the same. I wonder why Honda made 2 different part numbers and castings for the same piston? Hmmm...
Sonny
#3
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Re: D Series piston project update...the contenders so far. (jdmB18hatch)
i havent been reading past posts
just wondering what are you tryin to accomplish with this piston project?
best Honda d-series combo?
heres something i found very interesting the Honda GNX? (the natural gas car)
has 12.5:1 pistons in it ....it think these would make a great contender in this
project of yours
just wondering what are you tryin to accomplish with this piston project?
best Honda d-series combo?
heres something i found very interesting the Honda GNX? (the natural gas car)
has 12.5:1 pistons in it ....it think these would make a great contender in this
project of yours
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Re: D Series piston project update...the contenders so far. (Sonny)
id be more than happy to host all those pics for you and specs for each one
d16a.com is my site and im looking for more tech articles/specs etc
lemme know if you wanna do that...
d16a.com is my site and im looking for more tech articles/specs etc
lemme know if you wanna do that...
#5
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Re: D Series piston project update...the contenders so far. (Sonny)
The main motivation behind this project is to determine what compression ratio is yielded using different combinations of D series pistons and D series heads. There is such a large variance in the way that Honda designed the pistons that just about any compression ratio is doable.
For example, the PG6B (86-87 Integra) and the P28 (92-95 Civic) both have the same compression height (1.181"). They will be flush with the top of hte block when installed. However, the Integra piston has a small dome, but the Civic piston has a HUGE dish. The difference between the 2 pistons afa compression ratio is very large.
Here are some pics comparing the P29 (88-89 Integra) to the PM7 (88-91 JDM ZC). This Integra piston was slightly modded on top, but I've seen a very clear picture of the top of this piston and can say that it is identical in shape to the PM7.
Sonny
For example, the PG6B (86-87 Integra) and the P28 (92-95 Civic) both have the same compression height (1.181"). They will be flush with the top of hte block when installed. However, the Integra piston has a small dome, but the Civic piston has a HUGE dish. The difference between the 2 pistons afa compression ratio is very large.
Here are some pics comparing the P29 (88-89 Integra) to the PM7 (88-91 JDM ZC). This Integra piston was slightly modded on top, but I've seen a very clear picture of the top of this piston and can say that it is identical in shape to the PM7.
Sonny
#7
Honda-Tech Member
Re: D Series piston project update...the contenders so far. (Sonny)
Great posts! I love to see someone actually doing some reasearch about their car. I wrote an article a while back about all the different spring companys and, all the varying spring rates...(a lot of phone time) I think i got 3 responses..heh. Keep up the good work!!
-Jake
-Jake
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#9
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Re: D Series piston project update...the contenders so far. (rice_classic)
If someone wants to donate a B series engine and some pistons, I'd be more than happy to!
A B series compression calculator has already been done by several people. C-SPEED has a really good one, here:
http://www.c-speedracing.com/howto/c.../compcalc.html
Sonny
A B series compression calculator has already been done by several people. C-SPEED has a really good one, here:
http://www.c-speedracing.com/howto/c.../compcalc.html
Sonny
#10
Re: D Series piston project update...the contenders so far. (Sonny)
Thanks Sonny, fabulous work that you have done!
If you can please post your results on the Honda D Series engine building page:
http://pub34.ezboard.com/fhondadseriesfrm6
Our members would really appreciate it.
Thanks,
Chas Wolf
Administrator, Honda D Series
http://pub34.ezboard.com/bhondadseries
If you can please post your results on the Honda D Series engine building page:
http://pub34.ezboard.com/fhondadseriesfrm6
Our members would really appreciate it.
Thanks,
Chas Wolf
Administrator, Honda D Series
http://pub34.ezboard.com/bhondadseries
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