yo im trying to compare my compression numbers with other engines to see if i might have a problem. i have a b16 CTR pistons and stock headgasket and milled head. my compression reads 220 210 210 220 i just want a few examples to see if mine is too low or too high. its supposedly milled alot so there might be a problem. thx

 

I'll post mine as soon as I get the engine back together. I am in the process of putting CTR's in mine right now.

 

those numbers dont look so good...i have the same set-up and i compression tested mine a couple days ago..

275 275 270 270

i thought mine was a little low too...how much is your head milled?

 

mine is definaltely milled over .020mm, it might be mire, becasue if use anything but ITR spark plugs, the pitons hit the spark electrodes and bend the **** out of them. just lookin for some more numbers to compare. whats cuases your compression to be soo low with a build like mine.

 

b16 and 245/250 compression here.
and your domes hit the spark plugs....ouch
your rings could be worn...
you NEED to do a leakdown test to pinpoint the problem

 

alrgiht ill check a leakdown but yeah my domes hit the spark plugs. hmmm

 

leakdown ok ill try that, but yeah the dome hits the spark plug hmmm
oh and the rings are new, did a rebuild less than 7k miles ago

 

my plugs never hit...i used ngk's. what kind of fuel management/ecu are you running??

 

same setup, cold engine we got 250 psi give or take a few.

 

im running NGk plugs, the grade used in a type r, the gap size is about 2.5 mm smaller than the ones that a 2000 Si calls for, my ecu is a ericks racing chip, its setup is for a engine that is spraying 100 shot of NOS, but my car is NA. so there might be a problem with that. it runs really rich because of that.

 

fuel management is important with a milled head and ctr pistons because of the high compression. you may be running lean, or rich, which would cause the rings to seat badly. thats what happened to me, i ran too lean and detonated two pistons. i learned my lesson and got hondata.

 

hmm i think ill get a good tune them, maybe a ericks racing chip and vafc

 

to tell you the truth though, i think its too late for all that. your compression is pretty low. i would get new rings and **** and then get it tuned that way you are getting the most power out of your b16

 

say my rings did seat badly , could i get new rings and rehone the cyclinders or have to bore bigger

 

new rings and a hone would be sufficient. theres no need to overbore. that would mean new pistons anyway.

 

now how about when i rehone and put in new rings should i rebuild the block with new washers and bearings etc. or can i keep my old ones. they are not that old, say 7k miles on it.

 

all youll need to do is replace the rings..everything else should be okay to reuse

as soon as you get new rings though, make sure you get it tuned asap. if your pistons are hitting your spark plugs i wouldnt even run the same setup cuz its just asking for trouble

 

wouldnt using a fat head gasket like a .8 or 1 mm from TODa help me with my problem of my domes hitting my spark plugs, and the pistons dont hit all plugs, the integra type R spec NGk's are just short enough to fit with out contact of the piston.

also with that fat headgasket i would lower my compression considerably,
is this a good substitute for replacing the material that was milled off the head?

 

i would honestly recommend NOT using extra layers of a headgasket to make up for the milled head...nothing but leakage problems. just make sure the pistons arent tapped the head or spark plugs and you should be straight.

 

at what compression number for example 220 240 or 280 should you use a higher octane gas, what im looking for is like

at 240 compression use 94 octane gas or 91 with a good octane booster thrown in

anyone know this kind of information??

im expecting to have 280-290 compression and dont know what gas octane to use

 

130-140-120-40
cracked piston last friday

 

220 all four this is a ls block with stock ls pistons.

 

at what compression number for example 220 240 or 280 should you use a higher octane gas, what im looking for is like
at 240 compression use 94 octane gas or 91 with a good octane booster thrown in

anyone know this kind of information??

im expecting to have 280-290 compression and dont know what gas octane to use