i dynoed my car yesterday and these were the numbers. the motor is a 18c1 block gem sleeves bored to 84.5. still gsr crank with crower rods and endyn roller wave pistons compression is 12.5. with a cosmetic head gasket for boost .036 was told to use the boost head gasket by larry at endyn. compression is 12.5 with the slightly bigger head gasket. the head is a itr head ported and polished by rlz or hondaraceengine max_cfm on here. with itr vavles and his own springs. cams are rs machine cams with aem cam gears. aebs intake manifold and rpm 70mm throttle body. it has a aem fuel rail with 310 rc and b&m fpr and guage and wilbro 255lb fuel pump. the exhuast starts with a header tech header with a 3" collecter and down sizes into a 2.5 pipe to a magna flow muffler. it was sci msd and coil too. i'm wasn't to happy with the numbers, i was looking for 230 or so, what do you all think. the a/f looks perty good too. add timing till it stopped making power. we ran out of time so we didn't get to play with the cam gears but i don't think it could gain 30 hp. i did a compression test and 1 210, 2 220, 3 220, 4 250. i might have forgot some thing but just ask. anyone with any in sight please give it thanks it was tuned with hondata s100 don't know if pic work we'll see


Modified by ericrx_88 at 9:52 PM 6/3/2004


Modified by ericrx_88 at 9:53 PM 6/3/2004

 

i guess the pic didn't work anyone that came post it up for me let me know thanks

 

The problem lies in your compresion readings.

A motor with 12.5:1 compresion should read upwards of 300 per cylinder on a comp test.

Did the head gasket seal properly?
Where the valves lapped after the valve job was cut?
What head bolts are being used- What were they torqued down to?

I would do a leak down test and see where you are losing your compresion from.

It could be that your rings didn't seat properly. How was the motor broken in?

 

i don't know if the head gasket is properly sealed use arp head studds ther were torqued to spec. i broke it in the hard way. it was about 600 miles. sound ok i will go do a leakage teat now thanks

 

what were the #'s anyway?...

 

sorry i forgot the pic didn't work hp 195.9 and tq 144.9 rev to 8.5. i was going to do a leakage test but i lent it out soi i guess i will have to wait. i sure hope it is the head gasket tho.

 

What kind of dyno was it?
What are the specs on those cams also?

The tourqe #'s are good. The HP numbers aren't to bad for the compresion readings you have. When you did the compresion test how did you do it? I.E. Number of engine cranks on each cylinder, Throttle body open or closed?

Let us know what the leak down test reveals.

 

damn i see a X what did u dyno at?

 

it was no a dyno jet. spec on the cams i think are INTAKE:
470 LIFT
272 DURATION @.050

EXHAUST:
450 LIFT
270 DURATION @.050
when i did the compression test i did it with the throttle closed and the max reading. i did find the leakage tester and did a quick test and the first time 1-3 where good but 4 you could hear air from the other cylinders, so i did them again and now all of the are leaking. you can hear air from the other cylinders. just did it quick but i'm perty sure. so i'm thing bad head gasket let me know what you guys think. i'm out for tonite thanks eric

 

fixed the pic

 

Sounds like bent valves. Put one of the cyls at top dead center, then hook up the leakdown gauge and get air going through it, then go back to the rear of the car and listen through the exhaust, if you hear the air comming through you have bent exhaust valves. Do the same test with the intake off and listen through the tbody with the throttle plate open.

 

If its not comming from the intake or exhaust ports, pull the oil cap off and see if the air comes from there. It's normal for some to be comming from there.

 

Also what did air pressure are you using for the leak down test? Don't overpressurize or you will always get leakage. Try the compresion test again as well with the throttle plates open.

 

rings didn't seat properly

 

do the test with the throttle open then give us your numbers

 

one other thing you can do is try a no **** nice *** compression tester. i did the same and my numbers were all unsat so i got a good one and it read like 260 - 270 across the board. other another thing: when you did the comp. test did the needle read pretty high with the 1st three kicks? i think by the 2nd kick on mine it had cleared 150psi or so. if the needle takes too long to really get up there then its the rings. but to my understanding if the engine isn't fully brokin-in then the numbers should get better. but 195whp and 144ftlbs doesn't sound right at all.
my car put down 190whp and 150ftlbs on 11.3 c\r pnp b16 head & sk2 im, and a jun3 int. cam with a b16 exh. cam. and vafc. oh yeah with a stock fuel pump and injectors. goodluck bro i know how you feel. i was positive i would do 200ish whp and expecting 35 more whp probably feels impossibal right about now. i heard hella good things about those cams but they are lowwer lift more duration. more lift might be good a higher compression engine like yours.

 

What is your elevation? Is the dynosheet corrected?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by builtprelude &raquo;</TD></TR><TR><TD CLASS="quote">do the test with the throttle open then give us your numbers</TD></TR></TABLE>

Do this. This is the way it is supposed to be done so your #'s are not accurate cause u did it wrong.

BTW. Yeah you should be making alot more power.

 

thanks for all the inputs, i will do the compresion test with throttle open and get the numbers up. for the leak test i was using 35psi, too much or ok? but you can hear air coming out of some of the cylinders. put a hose to it and i'm sure. will get the nubers up too. thanks

 

was the car at operating temperature when you did the compression test and have you messed with cam timming at all?

 

the car was at operating temp and timing was done with hondata. i redid the compression with throttle wide opened and the numbers were 1 220, 2 235, 3 255, 4 255. and redid a leak test engige cold and the numbers are 1 35psi 55% you can hear air in 3, 2 35psi 20% you can hear air in 1, 3 35psi 20% you can hear air in 4 and 4 35psi 5%. on all of them you can also hear air in the breather. but i'm hoping it's normal. but i'm thinking it's the head gasket. let me know what you guys think thanks

 

it aint the head gasket. who put your engine together? i bet someone didnt line the rings up right and its leaking that way. all of you can sit there and try to blame it on rings that arent seating, but that is FALSE! one cylinder is not gonna seat when the rest do, doesnt work like that, unless the machinist committed a major ***** up.

its the gap from compression ring 1 to compression ring 2. that simple.

head gaskets first leak cylinder to cylinder, and the compression readings show that isnt happening. then they leak to a water jacket, and to check that the inexpensive way is to put a slight load on the engine with the radiator cap off and look for bubbles. hell, you can even have someone start the engine with the radiator cap off and see if it spits fluid out...

contact Pat Sajak and buy a clue!