what is the diffrence between 8.8:1cr opposed to stock ls1 cr...is higher better or do they have there strong points?

 

In short:SC/TC lower compression to run more boost w/o predetonation. N/A compression will net more HP/TQ. Stock LS1 is around 10.25/1 IIRC. BTW Nitrous likes compression as long as you have no predetonation.

 

SC/TC=? and N/A=?....i'm new to this... so if you had twin turbos or turbo can you spray as well with low compression or do you have to make adjustments to the compression ratio?

 

Just Might Blow If U Do That 8:1 To 1 Is Perfect For Blower Cars 10:1 For Naturally Asperated Cars Is Great On 10:1 U Can Also Add Nitro.

 

now i've been noticing ls1's converterd to 383 haveing lower compression ratio, can you spin that motor in the high 7 or low 8's N/A?

 

The ls1 doesn't really need to spin to 8k to make power...unless you are running a ******* HUGE cam, 8k is pointless. So many cams out there that, if you want to rev high, make their peak power at 6-6800 rpm. 383, from what I have seen, are popular for boosted applications. If you want N/A, there are many many different choices. Most N/A motors I see are around 10.5:1-12:1 with a good tune. More compression, more power N/A. But likewise, you will need higher octane (above 12:1 I would look into VP's line of fuels), and to get the best out of whatever you do, a tune will be essential.

 

Usually for a naturally aspirated engine you want to shoot for 11.1:1 - 11.5:1 compression.

If you plan to run boost with a supercharger or turbocharger you will need to lower the compression to 8.5: - 9.5:1.

 

if N/A motors are producing more power with there high compression is it safe to say there faster than SC/TC motors...because from what i've seen those SC/TC are pretty fast...

 

WAY to many variables. A boosted ls1 with a baby turbo could put down only 450 hp...take the same 450 hp, but in a H/C car, the H/C should have the better power band, and win. Like wise, the boosted car (blower) could spool like hell, and have a sick, flat torque curve, and over come the H/C car with the same hp. Way to many variables. Boosted cars can make more power then H/C. Most H/C run spray. That evens the field. Then it comes down to drivers and set up. You are asking to broad of a question, and there is no deffinate answer.

 

Just a tad high on the numbers for my taste unless you have a good tune. Otherwise I agree.
I'd like to run 11.0:1 N/A & a forged 8.5 with decent boost

 

LS1's are 10.5:1 factory. Lt1's are 10.4:1 factory. they are both great for nitrous applications, thats why they do so well with it.
Btw, s/c=super charger
t/c=tubo charger
n/a=naturally aspirated
Look up the acronyms in the search or whatever on this site and you will be much better off than asking everytime. there are tons that we use here and it takes a while to learn them all.

 

LS1's should be closer to 10.1 as was posted above, but yes both love some juice.

 

is it common to mill stock heads? and would that raise compression ratio or decrease it? i wouldn't mind going SC/TC but if more power loves higher compression than i'm leaning towords more power...

 

^^^ You seem a little confused.

If you plan to build a boosted application (SC/TC), you want to shoot for the lower compression. Heads with larger combustion chambers will help lower compression.

If you plan to build N/A, you want higher compression. Milled heads with a smaller combustion chamber will raise compression.

You will be able to produce more power with a SC/TC set-up just by upping the Boost PSI. To make the same kind of power N/A, you have to do a lot more "little things" + n20, IMO

 

Yes, most people mill the heads, and it increases compression. It mostly depends on your applications and your intended use of the car. Boosted cars with a good set up can make SICK power, the norm from a good procharger,maggie, or STS set-up on o mostly stock car will net right around where I'm gonna be on the spray with my set-up. But with boosted set ups vs. H/C there is alot more of a hidden cost in the form of "support mods" that can add up very quickly along with the initial cost of the power adder itself and get VERY expensive, VERY quickly. Hence the reason you'll see alot more H/C sprayed cars than anything else, as far as power adder goes.

 

right on fellas...thanks a bunch