compression - Nitrous Oxide Forum

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compression
Sunday, February 27, 2005 2:06 PM
what compression ratio should I go with in my z24......I know i should upgrade my internals.....like connecting rods and pistons ect,........but i was also wondering about the crank, weather i should buy a crank kit or have j-body performance send me one of theirs.......any help would be greatly appretiated.


racing a ford is like racing a fat kid.

Re: compression
Sunday, February 27, 2005 3:01 PM
The stock crank should be able to withstand any abuse you'll be likely to throw at it. As far as compression ratio, I think anything below 10.5 is safe with pump gas.


<img src=http://ourworld.cs.com/jwithspray/Jbeier_sig3.JPG>
Re: compression
Sunday, February 27, 2005 3:12 PM
cool, who should i go thru for a port and polish



racing a ford is like racing a fat kid.
Re: compression
Sunday, February 27, 2005 6:23 PM
call around to a local machine shop for your P&P



Im a Xbox 360 fanboy...and damn proud of it!!
Re: compression
Sunday, February 27, 2005 7:11 PM
ok, this may be a dumb question but i read in another forum not to spray until 3000rpms does it matter in what gear? oh yeah i have an auto





racing a ford is like racing a fat kid.
Re: compression
Sunday, February 27, 2005 7:18 PM
most kits come with a wide open throttle switch. basically when you floor it, it goes off



Im a Xbox 360 fanboy...and damn proud of it!!
Re: compression
Sunday, February 27, 2005 7:27 PM
ok.....thats pretty much what i was hoping for.....i'm still new too N2O but hope to pull some big numbers in the future..........and is direct port the safest (i mean that lightly) way to boost in all the different ways to add nitrous? last question i sware


racing a ford is like racing a fat kid.
Re: compression
Wednesday, March 02, 2005 10:04 AM
I gotta Q for jOO... I have some plans for my 2.4 in the future.. (not near future... lol) which include 10/12 psi froma turbo as well as a 75 shot maybe a 100 shot, pending on reliability and durability of the enternals. One of the most importione thing in need to know is the Compression.. Im rather clueless how high/low of a compression you would want to run safely w/o blowing head gaskets and throwing pistins thru your motor. LOL I know pretty much about the valvetrain options and what ot, but the bottom end i'm clueless on. If i bore and get bigger pistons.. what are your thoughts of my limis to the bore & piston size. Keep in mind I want to boost about 10/12 PSI on a built motor as wel as spray (by then it'll be Direct port Nitrous, for now its a wet kit) waht im goignt o try to do is buy all of the componets for my motor.. then at once rip it all apart and rebuild with the new. So it'll take me a bit to get all fo the stuff bought.. but i'd like to know whut i need to be looking for as of right now.

So any thoughts/suggestions for my 2.4??



Faith is to believe what you do not see; the reward of this faith is to see what you believe.
-Saint Augustine
Re: compression
Wednesday, March 02, 2005 10:20 AM
10 to 12 psi and nitrous! how much horse power do you want. or better yet what quater mile time do you want............still a good question though...


anyone?


racing a ford is like racing a fat kid.
Re: compression
Wednesday, March 02, 2005 3:54 PM
i want about 250 WHP for a daily driver.. safely on 10/12 psi. Nitrous only at the track. So i can compete with some nice imports and whut not. When i talked to cavalier connection... they told me they can hook me up w/ a turbo kit for my 2.4 w/ the performance mods & turbo garentee 250 HP, i dun member if it was to the wheels or not. But that wasnt even counting NOS.... So I dunno. I would like to have this all for the track as well as for shows There's not too many vert's you find all pimped out w/ alot of HP hehehe



Faith is to believe what you do not see; the reward of this faith is to see what you believe.
-Saint Augustine
Re: compression
Wednesday, March 02, 2005 4:54 PM
If you're gonna be running both, I probably would stick to somewhere around the low 8's:1 ratio for 10-12 psi and juice. You probably won't make 250 whp on 12 psi with that low of compression, but it'll be a real handful on a 75 shot. Better yet, run 9:1 compression and 12 psi and get your 250 whp on turbo alone, and only add a 25 shot to cool things off. You will more than likely see more like 35-40 extra HP when you spray a 25 shot on a turbo car like that.


<img src=http://ourworld.cs.com/jwithspray/Jbeier_sig3.JPG>

Re: compression
Wednesday, March 02, 2005 7:46 PM
Nitro wrote:

Better yet, run 9:1 compression and 12 psi and get your 250 whp on turbo alone, and only add a 25 shot to cool things off. You will more than likely see more like 35-40 extra HP when you spray a 25 shot on a turbo car like that.


That my Fellow J-Bro is whut Trollz talkin' about! that's exzactly whut i'm talkin about. Im always open to ideas that can improve on my thoughts/ideas! this is why you ask for opinions and questions. AS soon as i get my paint done.. Imma start moving toward this motor & turbo. I'll also be running a NX n-tercooler to chill the air going back into the turbo a bit so that'll help out some not a whole lot, but some. But never the less I dig you're idea..... 9:1 w/ 12 psi w/ 250 w/o the juice flowin through my system hehehe that is whut represents out J's! wOOt wOOt !



Faith is to believe what you do not see; the reward of this faith is to see what you believe.
-Saint Augustine
Re: compression
Wednesday, March 02, 2005 8:06 PM
waht's the stock compression on my Z24 auto? 10:1 ? when you lower it to 9:1 whut do they do plain the head ?



Faith is to believe what you do not see; the reward of this faith is to see what you believe.
-Saint Augustine
Re: compression
Thursday, March 03, 2005 4:08 AM
'95-'98 stock compression is 9:5 I think. '99-2002' is 9.7:1.


<img src=http://ourworld.cs.com/jwithspray/Jbeier_sig3.JPG>
Re: compression
Thursday, March 03, 2005 5:45 AM
thats right......the compression.........becuase i now have a 2000 model motor in my car and the compression is 9.7:1,


but what do you mean about the head...........are you thinking of when they port and polish the head?


racing a ford is like racing a fat kid.
Re: compression
Thursday, March 03, 2005 7:29 AM
I re-read that.. and i don't even understand whut i meant. LOL I ge tup at 4 am.. and stay up till all hours of the night w/o gettign much sleep. I know lastnight i was tired. LOL It's now aparent b/ ci dunno even whut the hell i meant by that post. lol I think what i was "trying" to get at.. is how do you go about to lower the compression to 9:1 from my stock 9.7:1? i think that's whut i meant by that weird 1/2 asleep question. lol



Faith is to believe what you do not see; the reward of this faith is to see what you believe.
-Saint Augustine
Re: compression
Thursday, March 03, 2005 6:47 PM
you can get pistons that fit in the stock bore but just to be safe i would get the block bored out (9.0:1 .20 overbore). also look into getting some connecting rods. talk to karo or go to carcustoms.net they have the best pricese i've seen. also are you rebuilding this engine or are you going to buy a used one and rebuild it?


personally its more convienent to buy a used one from a salvage yard and rebuild it b/c you can still use the car as a daily driver while you get that one rebuilt with all the goodies

good luck with your car, theres alot of power to be made.


racing a ford is like racing a fat kid.
Re: compression
Thursday, March 03, 2005 6:48 PM
i just looked at your registry, who are you sponserd thru. 12k thats the kind of money i want


racing a ford is like racing a fat kid.
Re: compression
Thursday, March 03, 2005 7:18 PM
I wouldn't go over .040 over bore. That makes a nice torque band too. I'm ripping off rubber in first. Crazy torque.
Re: compression
Friday, March 04, 2005 6:40 AM
fast plan wrote:

i just looked at your registry, who are you sponserd thru. 12k thats the kind of money i want

I need to change that... I didn't accept the sponsorship b/c it was a kick in the crotch. they sponsor you for $12,000 but you have to attend at least 3 shows (cross country) and they only pay for 1/2 of all of the part you buy.. Not to mention you have to plaster thier company logo all over your car.. I read the contract... more than 6 times and never signed it and sent it back in. Oh yeah they charge you $80 for a "contract drafting fee". So it was all a bunch of BS, sounded good tho. I would have been happy if they would have paid for my paint job & a turbo... but then I found out was was up and i was all *bah* cocks ! lol it was throught SCP (Sports compat pro) something like that.. so don't fall for it, it's a total waste of BS time.



Faith is to believe what you do not see; the reward of this faith is to see what you believe.
-Saint Augustine
Re: compression
Friday, March 04, 2005 10:19 AM
that sucks........sounds like warranty company...you have to fight them for everything.


racing a ford is like racing a fat kid.

Re: compression
Friday, March 04, 2005 4:46 PM
fast plan wrote:

that sucks........sounds like warranty company...you have to fight them for everything.


Yeah it was bad.. the worse part is THEY DON'T TELL YOU ANYTHING untill you ask and dig deeper about things.. the contract is confusing the way they put it, sounds easy as hell.. but it's jippin' ya and you don't even know it. I had a few other peopel read it.. and they said it sounded cool. But then i called and started asking about this & that.. if i could get a turbo, if so what was the limit.. then out came the truth.. and you have to choose from what they have.. not whut you want. LOL Unless they have it. It's complete @!#$.. so remember that EVERYONE! Don't do it! I'm not a sell out who wants to slap all these stickers on my car to just get things for free.. you lose all self respect or pride you got in yourself & ride. I'll do it all myself and know that my car was worth it all b/c i hadda work for every inch of it!



Faith is to believe what you do not see; the reward of this faith is to see what you believe.
-Saint Augustine
Re: compression
Friday, March 04, 2005 5:16 PM
fight the power


racing a ford is like racing a fat kid.
Re: compression
Saturday, March 05, 2005 8:26 PM
you can get pistons that fit in the stock bore but just to be safe i would get the block bored out (9.0:1 .20 overbore).

Actually, over boring would increase the CR, if only by a couple of tenths. You would have to get lower compression pistons, which would have to be custom made(not sure on this, haven't search for them). You could also try extra thick head gaskets, but they usually only drop the CR a couple of tenths. You could try stacking two copper head gaskets(the thicker the better)but make sure to coat them with a copper head gasket dressing or aluminum based spray paint. This would drop the CR about three to five tenths, depending on the gasket thickness. Don't try to stack composite gaskets, especially on boosted applications.





Re: compression
Sunday, March 06, 2005 11:08 PM
ty madjack



Faith is to believe what you do not see; the reward of this faith is to see what you believe.
-Saint Augustine
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