did a test today...took the sparkplugs out and fuel injection fuse....put the comp. tester in the holes...cranked the motor 5 times for each cylinder....

#1 210
#2 250
#3 245
#4 245

wut do u think is wrong with number 1??? and is 245 normal for my setup?

setup

blox IM
gsr head
supertech valves
omni dualsprings retainers
jdm itr pistons
gsr stock block
gsr cams


thanks guys...

 

A couple of questions:

Is the motor broken in? If so, what was the method?

Was the head rebuilt?

Was this test taken with the engine fully warmed up?

 

i finished it yesterday....started it up checked for leaks....today around 12 i went around my neighborhood to see if there was power loss and there was....so i brought it back home then a couple hours later when the engine was cold i did the test.....

i bought a bare head and built it..

 

Ok, so let me make sure I understand this correctly.

The motor is completely rebuilt. This means new pistons, rings, seals, pumps, etc. and the head has new valves, springs, retainers, guides, seals, etc.

After you took it out it, felt a little low on power. I don't know what your mods are but you really have to get it tuned for it to run properly


Okay, I think you need to get it tuned on a dyno. This will properly get the rings seated.

 

wut u guys think is the normal psi for my setup

 

I don't think your motor is properly broken in, ie rings not seated.
Get the motor tuned then your compression numbers should be more even.

 

im running a stock gsr p72 ecu....is that bad?

 

if it was re-built with stock components then a stock ecu is okay. But it still needs to be broken in.

If you have anything in it that is a real power adder (cams, higher than stock compression pistons, port work, header) then it definitely needs tuning.

The simpliest way to breakin a engine, dyno tuning.

 

Even if the rings arent fully seated yet, they should all be fairly close. Theyll just be low and fairly close, if that makes any sense. Do you have access to a leakdown tester? They can save you a ton of time.

 

https://honda-tech.com/zerothread/1360641

 

Did you remember to do it at WOT? j/w since you listed every step besides that

 

Right after I built my motor before I ever started it on a cold motor--my numbers went from a low of 255 to a high of 265--like combustion said, even if the rings aren't truly seated yet, they should be pretty close. A leakdown is your best bet right now--maybe a valve isn't sealing that well, a leakdown will tell you where air is leaking from. Also, you MUST make sure that all the spark plugs are out of the cylinders and that the throttle is open 100% on each cylinder.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NA JDM GSR &raquo;</TD></TR><TR><TD CLASS="quote">im running a stock gsr p72 ecu....is that bad?</TD></TR></TABLE>

its NO WHERE NEAR THE BEST, you prolly have a shitty as hell mudrange

 

whats your valve lash at on the low cylinder?

 

wait so ur supposed to press on the gas when u crank the motor for the test?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NA JDM GSR &raquo;</TD></TR><TR><TD CLASS="quote">wait so ur supposed to press on the gas when u crank the motor for the test?</TD></TR></TABLE>

lol yes. watch its like 260 all the way across

 

i was always under the impression that consistensy is more important than the numbers themselves, as the gauge could be innaccurate etc.

 

Make sure the alves are all adjusted!

 

DO NOT run this engine with stock P72, vtec has WAY too much timing. You WILL blow up the engine, especially with stock GSR cams being there...

 

wut do u mean way too much timing...and y are gsr cams bad if its a stock gsr ecu?

 

stock GSR ecu has very agresive timing map for VTEC. On top of that stock GSR cams on high static compression engine will result in very high dynamic compression as well, and result is nice torque, but also blown engine if you do not have fuel with high enough octane rating.

So you kind of get double trouble here, you increased compression by putting in JDM pistons, and as you use gsr cams they are too small to effectively do what cams need to do with this kind of setup, not to mention that they do nothing for yur power, other than probably produce nice TQ down low ( at the risk of detonation)

I'll say again, do not run this with stock p72 and take it somewher to have it tuned.

 

but i always use 93 octane and also can i just tune my p72?

 

if its obd2 no ( you techincally can but its NO WAY cost effective) just get an obd1 harness and a p30 or p28

 

so im better off getting type r cams and onbd1 p28 ecu and tune it

 

?