Performed a compression test today, all 4 cylanders are at 230 psi? What would cause this. The reason why I checked is because there was pinging coming from the head when I would stomp the throttle. Checked valve clearance, timming, and performed a leak down test. Every thing else was good???

 

im gonna take a stab at it and say that your engine is probably still healthy if all four cylinders were at 230 psi, what gear where you in when you mashed and heard pinging?
if it was hot and in fifth gear, you were probably detonating

 

230 across the board. So whats the problem?

 

It's the shitty 91 octane fuel we get here in Cali. Tune it with Hondata or similar.

 

Whats your setup?

 

230psi, means 12.0cr or higher. definitely your problem is fuel octane. you should be using 95 or higher.

 

if its pinging under load u got detonation. U will have to retard the ignition timing in the areas of the detonation with crome, or hondata,etc. Dont keep driving it like that if u want ur motor 2 live a nice life.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VTiSpec &raquo;</TD></TR><TR><TD CLASS="quote">230psi, means 12.0cr or higher. definitely your problem is fuel octane. you should be using 95 or higher.</TD></TR></TABLE>

Not necessarily. Different compression testers give different results. I had a JDM GSR motor (10.6 : 1) show 240-240-240-240. Whats important is just that they're uniform across.

 

My set up:

B18a1 Block
LS rods and crank
Type R pistons
Type R oil pump
Type R water pump
B16 head
Type R cams
Stock LS injectors
P28 ECU OBD1
Type R LSD on B16 trans
Stage 2 Clutchnet clutch

detnation occurs at load only, so when I'm at any gear and RPMs are low it pings for a few seconds until the RPMs are higher.

 

get it dynoed, and your problem should go away

 

I spoke to AMS Motor Sports and they told me I need to get a VAFC and have them tune it.

 

I think your A/F might be off. Get it tuned.

 

or you can use uberdata or chrome and have them tune it

 

thanks for all your help guys. I thought my motor was a goner. I guess I will be gettin it tuned some where. Any one know a good reliable tuner around the orange Co. area?

 

church autootive testing info on the dyno

VAFC tuning is as expensve and not nearly as effectve as hondata tuning. Mine was a simple b16 wit boltons no cams, stock comp ect. It's not as cheap as free uberdata ect but with these gains and going from air fuel ratios that had been as off as 11.5:1 are now a rock solid 14.05:1 which also saves a grip of fuel despite the extra power.

runs are with and without ecu tuning (I don't have cam sprockets or a fuel pressure regulator) also vtak cell phone was moved down from 57 to 5200 rpm

 

i got 220psi with my lsvtec with b16 pistons 11.4 cr but i also have big cams

 

in my 13.2 cr gsr, i had 240 across the board with crower 403s

 

So, what software should I use. Hondata, crome, VAFC or uberdata???

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HondaIntegraR &raquo;</TD></TR><TR><TD CLASS="quote">in my 13.2 cr gsr, i had 240 across the board with crower 403s</TD></TR></TABLE>

So, 230psi across the board is not bad with type r cams?

 

So what would 285 across the board equate to?

 

nice numbers!

 

in my opinion, you should not get a vafc, the money could be used on more worthwhile things,...... crome, ubderdata... hondata
also you cant really calculate compression just by looking at the psi in the cylinders

 

is there any real way to tell what your static compression is with compression numbers? i had 270 across all 4 on my old motor

 

My friend has the same set-up. 230 all across is good just get a good tune with uberdata. He had the same problem before the tune, all we did was richen the fuel at the fpr and p[lay with the timing and the pinging went away

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fmrprojects &raquo;</TD></TR><TR><TD CLASS="quote">My friend has the same set-up. 230 all across is good just get a good tune with uberdata. He had the same problem before the tune, all we did was richen the fuel at the fpr and p[lay with the timing and the pinging went away</TD></TR></TABLE>

So, you turned up the fuel pressure and how did you "play" with the timming?