I headed over to Chris's house to do a valve adjustment(thanks Chris, took us ~10 minutes with both of us working on it) and since the car was cold and Chris had a compression tester we decided to test the compression. I'd never checked compression, so the opportunity presented itself and we took the 10 minutes to check it out.

Standard procedure when doing a compression test; we unplugged the injector ground, and disconnected the distributor harness, 5 cranks, full throttle, we checked each cylinder twice.

Mods that matter in this test:

Mugen headgasket(Per Mugen +0.4 CR)
Toda Cam Gears, +5, +5(net of +3.5, +3.5 for headgasket)
Mileage 58,400(almost forgot this )

Since we tested each cylinder twice, there are two numbers listed for each cylinder:

#1 - 245, 250
#2 - 250, 250
#3 - 245, 250
#4 - 245, 245


Looks like the numbers are fairly healthy

Have a good day

Austin

 

Strong numbers

 

those are high numbers... how much PSI would a stock ITR have usually?

did anyone did a compression test on a stock internal itr?

thanks

 

I never did a "before" test on my ITR but with a Spoon 2-ply head gasket and everything else stock I am running 235psi flat across the board on all 4 pistons. My AEM sprockets are at 0,0 right now, am I going to see an increase in compression when I tune them ??

 

Nice numbers but aren't you supposed to do a compression test when the engine's at operating temp?

 

Looks 'close' to mine.

https://honda-tech.com/zerothread?id=176578

Will
-who re-tested recently... but read the gauge wrong. :hamma:

 

My compression test was done on my STOCK motor with the same tester, and same conditions... it was near 225.

once I did the CTR pistons and Mugen gasket, the numbers were up around 270 before break in.

 

at operating temp and oiled up, the numbers would be better.

 

CTR pistons? arent those made for 1.6 L? they fit?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ScorpioX &raquo;</TD></TR><TR><TD CLASS="quote">CTR pistons? arent those made for 1.6 L? they fit?

</TD></TR></TABLE>

Yup, they work great for getting the compression up. (I was at about 12.5:1)

No more pump gas.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ScorpioX &raquo;</TD></TR><TR><TD CLASS="quote">CTR pistons? arent those made for 1.6 L? they fit?

</TD></TR></TABLE>

Yes, they are made for the 1.6L, but it has the same bore, and Chris used the overbore size of 81.25mm, as long as you have your valve to piston clearances set correctly, and the car tuned correctly there should not be an issue with using these pistons.

Austin

 

wow u learn something everyday....

how much power to they give you ?

thanks

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ScorpioX &raquo;</TD></TR><TR><TD CLASS="quote">how much power to they give you ?

thanks</TD></TR></TABLE>

Stock top end, and JDM OEM 4-1 header... 198 to the wheels, 136 torque.

 

how much do they CTR pistons go for?
And where is the best place to get them?

thanks

 

you got IM!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ScorpioX &raquo;</TD></TR><TR><TD CLASS="quote">how much do they CTR pistons go for?
And where is the best place to get them?

thanks
</TD></TR></TABLE>

I buy all of my JDM and most all of my performance parts from Mike at IPS Racing.

Austin

 

with CTR pistons and JUN IIIS i was hitting wat past 300psi in every cylinder.

 

I found a guy that is selling CTR pistons...
i want to make sure they actually are CTR pistons... what markings do i need to look for? or code? is there a site that i can go check?

thanks guys.

 

Hmmm.. cant remember, Maybe P73 stamped on them?

 

no they are stamped PCT

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Notorious B.A.G. &raquo;</TD></TR><TR><TD CLASS="quote">no they are stamped PCT</TD></TR></TABLE>

ahhh yes.. thanks. Been a while.

 

No prob

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Austin &raquo;</TD></TR><TR><TD CLASS="quote">

#1 - 245, 250
#2 - 250, 250
#3 - 245, 250
#4 - 245, 245

</TD></TR></TABLE>

Austin, you're prolly an avid Mobil 1 user !!!
very nice, I hope you never rebuild and just keep adding more mods to your stock motor and break a 200, that would be very cool !!!


Greg

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CHEETAH &raquo;</TD></TR><TR><TD CLASS="quote">

Austin, you're prolly an avid Mobil 1 user !!!
very nice, I hope you never rebuild and just keep adding more mods to your stock motor and break a 200, that would be very cool !!!


Greg</TD></TR></TABLE>

Mobil 1 since ~10,000 miles, I've used Redline 10w30 for the last 6,000 miles, I manage to burn oil at throttle lift regardless if it's Redline, or Mobil 1 10w30, so I'm switching back to Mobil 1.

Power levels...well, I've thought on the Toda A's, or the Skunk 1's but with the more aggressive vtec lobes I'm under the impression that I'll be making a sacrafice in the mid-range since the plot is already smooth with a 3,300rpm crossover, the larger lobes causing a harsher transition would require a higher vtec crossover. We tuned the cam gears for more of a mid-range power level, so I'm under the impression that with retuning of the cam gears for a peakier power level I'll be able to gain some peak whp with a sacrafice of the mid-range. I think that a ported and shaved head along with a redesigned header from John would most likely get me to the 200whp mark on stock cams, and possibly close to the 140ft/lbs. I've also been kicking the idea around of selling off my icebox and investing in the Mugen intake as a few people have tested it locally and had a fair amount of gains over the icebox. But at the moment I'm very happy with how well the car is running, just need to invest in a decent catch can to help with the oil that's making it's way through the PCV system. I'm not going to tear the motor apart until it really needs it, which may be another 2 years when I'll be around the ~120,000 mile area, we'll see what happens between now and then.

Thanks for the encouragement Greg,

Austin

 

Hum, I'm 200 psi all around... I hope it's the crappy tester that is not accurate...