hey whats up i was wondering if 13.1 compression is too high to run on pump gas for a reliable daily driver even with a nice tune pls someone help me out on this one here is my setup if this helps

98 gsr block bored .5 over
eagle rods
new acl bearing
je 13.1 high compression pistons
micropolished balanced crank
type r oil pump

jdm b16 head
skunk 2 flat faced valves
crower dual valve springs
crower titanium retainers
new type r LMA
buddy club spec III cams


here is a pic of the pistons



Modified by jdmb16ef8 at 10:44 AM 8/18/2007

 

Do you mind using 100 daily lol.

You could do it in theory, but your timing will be wack. Comp ratio isn't the only thing for power, you'll be hard pressed to find an enjoyable setup running that on the streets.

 

yea im not tryin to use 100 daily i want to run it on pump gas

 

you'd have more fun with 12:1

You will need to either run high octane fuel, or pull tons of timing at 13

 

you could do it, but be weary of getting a bad tank of gas. Look into E-85

 

what do you mean by be weary of gettin a bad tank of gas and what will happen if i run 93 octane daily?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdmb16ef8 &raquo;</TD></TR><TR><TD CLASS="quote">what do you mean by be weary of gettin a bad tank of gas and what will happen if i run 93 octane daily?</TD></TR></TABLE>

p p p p p ping ping ping.

detonation is not your friend. 13.1 is waaaaaaaaaay too high. i wouldn't go over 12.1 on pump, but that's just me. plus, we only get 91 'round these parts.

 

i have a 12.5:1 setup and run it on pump. but in nj we get 94 octane. i still throw in octane booster just in case. but i didnt have to pull any timing out of it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cartune network &raquo;</TD></TR><TR><TD CLASS="quote">i have a 12.5:1 setup and run it on pump. but in nj we get 94 octane. i still throw in octane booster just in case. but i didnt have to pull any timing out of it.</TD></TR></TABLE> What were the head CC's and the piston CC's at TDC. I wii assume a stock HG.

 

retard your timing and that motor might last you 2 days! lol its not a good idea!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DonF &raquo;</TD></TR><TR><TD CLASS="quote"> What were the head CC's and the piston CC's at TDC. I wii assume a stock HG.</TD></TR></TABLE>

im using a b16 head on a gsr bottom end with an oem head gasket. so my comp ratio isnt really 12.5:1 its more like 12.2:1 maybe even 12.1:1 im using je pistons set for a 12.5:1 with a gsr head but because im using the b16 head which has a larger combustion chamber it automatically lowers my comp ratio.

 

12.5-1 JE's are for .0000 deck, what was yours? Anything lower than .000 you have less compression.

 

i had the machine shop set everyting up and they had all the info for the pistons right infront of them the whole time. i saw the guy mill the block out but i dont know how far he went with it but im assuming he didnt go all the way with it because i was concerned with piston to valve clearance because im using buddy club spec 4's which is a pretty big cam and i didnt wanna mill anything out too far to the point where my comp ratio is gonna be too high and my clearances are gonna suck. if i wanted to keep it at 12.5:1 i would have just kept the gsr head instead of using the b16 head. u get me?

 

all in all my comp ratio is probably closer to 12.0:1 than 12.5:1

 

That makes sense. I have purchased 13.5 -1 pistons that measure 12.7-1. Checked a 13-1 engine and got 12.4-1.

 

exactly. the static ratio is different than advertised ratio. not to mention theres a hell of alot more involved with caltulating compression than just the pistons. static compression is the usable compression advertised comp is just bull **** really lol.

 

that is why you look at the cc of the dome...

 

if i cant use pump gas on this with a tune then someone throw me some offers here want i want an all motor car that is fast and reliable for daily driver

 

i was 13.7 to 1 and running pump gas and the car ran like *** could not get timing right and pinged like crazy.

 

just run e85 and get bigger injectors than you have now.

 

e85

92-93-94octane

 

I like the setup. You must not like money I would buy a beater and drive this on the weekend straight on race gas

 

im running a similar steup as this but mine is like 14:1 cr and i cant dd it cause race gas gets expensive as expletive!! but good luck with the build!

 

whats a good comp for an h22 daily running 91

 

11:1.