Cp pistons 81.5 9:1 or 9:8.1 cr?
#1
Cp pistons 81.5 9.8:1cr. Lsvtec basic First timer!
i bought used block off acquaintance friend locally known to build motors so i took a $600 chance on his short block complete minus head / tranny parts. He doesn't remember if it was the 9:1 or 9:8.1 cr ratio. Can anyone identify it I tried pulling google image but they all use same picture.
Last edited by KiNGDEE206; 09-11-2019 at 01:02 AM. Reason: Mods can u change title please! Changing this into build thread
#2
Moderator
iTrader: (14)
Re: Cp pistons 81.5 9:1 or 9:8.1 cr?
You're going to more than likely be somewhere in the middle anyway depending upon the head that you're going to use, it's valves, milled block/head surfaces etc.
The only way to truly confirm use to either find some etched part numbers or take the block alert, take full measurements and compare with the catalog (which IMHO is not worth doing, really, due to what I said in the previous paragraph)
#3
Honda-Tech Member
Re: Cp pistons 81.5 9:1 or 9:8.1 cr?
only other way is if someone else with the same pistons can confirm which I think is what OP was hoping for. If I had to guess I would say those are the 9:1 model
But I do agree with shodan here once model is verified you need to take the specs punch it into a compression calc along with your other motor specs to get anything accurate
But I do agree with shodan here once model is verified you need to take the specs punch it into a compression calc along with your other motor specs to get anything accurate
#4
Re: Cp pistons 81.5 9:1 or 9:8.1 cr?
Thanks guys. Yea I no punch the zeal calculator I just wanted to know if pistons themselves were 9:1 spec or 9:8.1 spec. I know it'll change with what first post said. Milling head block hg valves
for some reason I see a lot of cp pistons don't have part numbers but numbers like 82-2 or 79-2
for some reason I see a lot of cp pistons don't have part numbers but numbers like 82-2 or 79-2
#7
Honda-Tech Member
Re: Cp pistons 81.5 9:1 or 9:8.1 cr?
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#10
Re: Cp pistons 81.5 9:1 or 9:8.1 cr?
the "bowled" pistons have less static compression height than flat pistons. So comparing with the 9:1 (more "bowled" than yours) i would suggest yours are 9,8:1.
#11
Honda-Tech Member
Re: Cp pistons 81.5 9:1 or 9:8.1 cr?
Yea I agree with you after looking at it a bit more just received the pic of my 9.8's they look to be same as the op
#13
Re: Cp pistons 81.5 9:1 or 9:8.1 cr?
Flywheels been resurfaced
bought Teflon tape
replaced stock valvetrain to supertech valve springs. Stock retainers
type r cams
Will post pics tomorrow. Too tired!
but excited. Sold my gsr-ctr longblock so now I got funds to bankroll this a little! Stay tuned
bought Teflon tape
replaced stock valvetrain to supertech valve springs. Stock retainers
type r cams
Will post pics tomorrow. Too tired!
but excited. Sold my gsr-ctr longblock so now I got funds to bankroll this a little! Stay tuned
#16
Re: Cp pistons 81.5 9:1 or 9:8.1 cr?
im gonna use the SC on a basic B20vtec SC at a later time
~~~~~
little update i gotten in a car accident on my daily ej8 sedan
and so im bit handicap injured
this will be little slow to get going
resurfaced flywheel 12LB CC
put on my CC stage4 sprung kit on
Now thats left:
put on hondata 4bar map sensor(gotta find it forgot where i left it)
put on transmission (Waiting on any friend to come help since im handicap injured rn)
buy new Orings that sit in IM for my 750cc
buy oil pan gasket
need a VC gasket kit
#17
Honda-Tech Member
iTrader: (3)
Re: Cp pistons 81.5 9:1 or 9:8.1 cr?
You have some quality parts in your setup, should be fun.
I don't think those are ID injectors tho, sir.
ID makes 725's afaik....That's what I have...and if you google some images you will see some discrepancies.
They have a colored band/clip component, and the nozzle/pintle area will be machined away considerably as part of the modification process.
Also they will have either a hand-etched serial number or later units have laser-etched logos.
You can ask them to check the unique serial to verify if they are genuine, they have every injector they ever sold documented.
Those look like un-modified Bosch injectors.
Which might even be better than 725's. If they're some of the 2200 cng types you can make a lot of power.
Maybe even 1000's.
I think you need to know what the rating is so it can be tuned.
I suppose it will become evident quickly to a competent tuner, but being able to load proper dead times etc. at first will be best.
I don't think those are ID injectors tho, sir.
ID makes 725's afaik....That's what I have...and if you google some images you will see some discrepancies.
They have a colored band/clip component, and the nozzle/pintle area will be machined away considerably as part of the modification process.
Also they will have either a hand-etched serial number or later units have laser-etched logos.
You can ask them to check the unique serial to verify if they are genuine, they have every injector they ever sold documented.
Those look like un-modified Bosch injectors.
Which might even be better than 725's. If they're some of the 2200 cng types you can make a lot of power.
Maybe even 1000's.
I think you need to know what the rating is so it can be tuned.
I suppose it will become evident quickly to a competent tuner, but being able to load proper dead times etc. at first will be best.
#18
Re: Cp pistons 81.5 9:1 or 9:8.1 cr?
You have some quality parts in your setup, should be fun.
I don't think those are ID injectors tho, sir.
ID makes 725's afaik....That's what I have...and if you google some images you will see some discrepancies.
They have a colored band/clip component, and the nozzle/pintle area will be machined away considerably as part of the modification process.
Also they will have either a hand-etched serial number or later units have laser-etched logos.
You can ask them to check the unique serial to verify if they are genuine, they have every injector they ever sold documented.
Those look like un-modified Bosch injectors.
Which might even be better than 725's. If they're some of the 2200 cng types you can make a lot of power.
Maybe even 1000's.
I think you need to know what the rating is so it can be tuned.
I suppose it will become evident quickly to a competent tuner, but being able to load proper dead times etc. at first will be best.
I don't think those are ID injectors tho, sir.
ID makes 725's afaik....That's what I have...and if you google some images you will see some discrepancies.
They have a colored band/clip component, and the nozzle/pintle area will be machined away considerably as part of the modification process.
Also they will have either a hand-etched serial number or later units have laser-etched logos.
You can ask them to check the unique serial to verify if they are genuine, they have every injector they ever sold documented.
Those look like un-modified Bosch injectors.
Which might even be better than 725's. If they're some of the 2200 cng types you can make a lot of power.
Maybe even 1000's.
I think you need to know what the rating is so it can be tuned.
I suppose it will become evident quickly to a competent tuner, but being able to load proper dead times etc. at first will be best.
its already obd2 for my ek so I’m solid on that
its been going really slow
i got car accident a month ago
a seizure two weeks ago
i just bought valve cover gasket and grommets
To finish:
Buy eBay fan and rad $60. Use eBay fan in front while stock fan in og location for why not
need to buy grommets for injectors
go to fitting store buy some fittings to screw in my intake manifold
some fuel rail bolts 10mm
put transmission on
find the hex screw size and remove from spare block
i sold my inline pro manifold. And got scammed on a mini ramhorn so PayPal got my money back. Gonna use my blox one until I get a better one
here’s some pics
Last edited by KiNGDEE206; 10-08-2018 at 08:27 PM.
#19
Re: Cp pistons 81.5 9:1 or 9:8.1 cr?
In he process of buying this manifold second hand brand metigulous
what u guys think solid? Getting it for great deal and I sold the inlinepro my drag manifold wg location is on cyl one which is no bueno I read
so my catch can is 4x -10an port
my vc is -12an I bought 2 adapters -12 >-10an fittings
i block off stock black catch can
is 2 -10an good enough?
or should i buy 2 block -10an fittings and hoses and run all 4 still block off black catch can?
new to this need to do more reading
need to buy 3 m6x1.00x22mm studs or bolts
need to buy a 14mm allen Key 1/2 in socket
need to find a new FPR or find a 90 degree angle?
what u guys think solid? Getting it for great deal and I sold the inlinepro my drag manifold wg location is on cyl one which is no bueno I read
so my catch can is 4x -10an port
my vc is -12an I bought 2 adapters -12 >-10an fittings
i block off stock black catch can
is 2 -10an good enough?
or should i buy 2 block -10an fittings and hoses and run all 4 still block off black catch can?
new to this need to do more reading
need to buy 3 m6x1.00x22mm studs or bolts
need to buy a 14mm allen Key 1/2 in socket
need to find a new FPR or find a 90 degree angle?
#21
Re: Cp pistons 81.5 9:1 or 9:8.1 cr?
Got the metigulous turbo manifold for a steal. Brand new but second hand
i just need to go buy. A 14mm Allen 1/2 socket
put oil pan gasket on
find 3 m6-1.00-22mm studs
ive checked oem b16a2 hey only sell by 2
ive tried local hardware they’re not double sided idk if that matters
then I can put it in the car
been little slow bc dealing with my wrecked stock ex civic
e:next day
Went to harbor freight. Bought me 9piece Allen key 1/2 3/8 socket set and got free 5x7ft tarp
they always give out free 5x7 tarps from coupon. Which is awesome. Let’s face it. Who doesn’t want free tarps lol
My ingersoll rand w7150k is awesome. Got it for my bday 6 years ago still running strong!
im going to vent my catch can to only the top vc ports nothing on block
hopefully someone can chime in and tell me that works ok or not.
now I only need to put oil pan on (gotta go buy the sealant)
gotta buy 3x m6-1.00-22mm studs
i just need to go buy. A 14mm Allen 1/2 socket
put oil pan gasket on
find 3 m6-1.00-22mm studs
ive checked oem b16a2 hey only sell by 2
ive tried local hardware they’re not double sided idk if that matters
then I can put it in the car
been little slow bc dealing with my wrecked stock ex civic
e:next day
Went to harbor freight. Bought me 9piece Allen key 1/2 3/8 socket set and got free 5x7ft tarp
they always give out free 5x7 tarps from coupon. Which is awesome. Let’s face it. Who doesn’t want free tarps lol
My ingersoll rand w7150k is awesome. Got it for my bday 6 years ago still running strong!
im going to vent my catch can to only the top vc ports nothing on block
hopefully someone can chime in and tell me that works ok or not.
now I only need to put oil pan on (gotta go buy the sealant)
gotta buy 3x m6-1.00-22mm studs
Last edited by KiNGDEE206; 10-29-2018 at 05:21 PM.
#22
Re: Cp pistons 81.5 9:1 or 9:8.1 cr?
i would still vent the block. allowing crank case pressure to escape isnt a bad thing.
im sure someone will come with a better explanation tho lol
im sure someone will come with a better explanation tho lol
#24
Re: Cp pistons 81.5 9:1 or 9:8.1 cr?
swap is installed!
I ran into a problem with ruel rail
i ordered oem em1 m6-1.00-28mm
too short
gotten m6-1.00-40mm. Bolts. Just a hair too much. Gotta go back to McLendon and buy some washers to space it out
the edelbrock performer x is a very tight fit with firewall holy
#25
Honda-Tech Member
Re: Cp pistons 81.5 9:1 or 9:8.1 cr?
came with the injectors I bought
swap is installed!
I ran into a problem with ruel rail
i ordered oem em1 m6-1.00-28mm
too short
gotten m6-1.00-40mm. Bolts. Just a hair too much. Gotta go back to McLendon and buy some washers to space it out
the edelbrock performer x is a very tight fit with firewall holy