Can it be done on 93 octane? I can't afford it anytime soon, but I've just been curious if it would even be possible. Using a compression calculator I found online, I came up with around 10.7:1, but my block's been decked so I figure it's closer to 10.8:1 or so.
10.8:1 CR + boost?
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Adam95GT
New Member
wow... thats some high compression for boost... N20 would love it but i wouldnt feel right boosting something with that high compression... i dont know enough to tell you for sure... but when i was gonna boost the JDM probe motor 10:1 compression i know i could only run about 7lbs on stock internals b4 they would be blown to o bits... but i mean i guess with a nice FMIC... and low boost amounts i guess it would be possible... id still drop down the compression...
Did a little on line searching... came up with a clasic stang running a 331... with 10.8:1 running a SC at 8 psi...
http://www.fordmuscle.com/archives/2006/08/DIYEFI/index.php
Did a little on line searching... came up with a clasic stang running a 331... with 10.8:1 running a SC at 8 psi...
http://www.fordmuscle.com/archives/2006/08/DIYEFI/index.php
BlackVert
15 Year Member
Zero Signal
Active Member
I was recently wondering the same thing since my new combo will be running about 10.4:1 and I had dreams of a KB 4-6psi down the road. I'm already going to use the steel head gaskets. I don't know if that's just asking for trouble with the short block.
Yeah, I probably won't have the extra cash to spend on a s/c for a loooong time, and I don't really need the extra power from it. I was just curious if it would be possible in case I won the lottery someday or found a used s/c for like $500 or something. The bottom end is already built with forged crank, rods, and pistons.
dinan and active autowerkes have been boosting M3's with great sucess for a long time now--they run around 11:1
same with S2000's
in my book low boost high compression beats low compression high boost any day.
i would run like 6-8 lbs intercooled turbo with some meth inj for that added safety. should make crazy power.
btw active auto has been known to run 18lbs on the M3.
same with S2000's
in my book low boost high compression beats low compression high boost any day.
i would run like 6-8 lbs intercooled turbo with some meth inj for that added safety. should make crazy power.
btw active auto has been known to run 18lbs on the M3.
I knew a local guy with a Lingenfelter(sp) vet with 11:1 compression that added a procharger pulleyed for only 5lbs of boost. The car was an animal before the blower and just insane after it. they ran it that way for a few months and then one hot summers night it decided to detonate and BOOM, that was all she wrote. They fixed the engine and did not put the blower back on. It all comes down to cylinder pressure. If you keep the boost low and cool, you should be able to get away with a few lbs of added pressure. I'd try and make it as safe as possible by running methanol injection, etc. Its definitely not the best scenario, but you could do it if you really wanted to.
How much do you think that block can handle?
How much do you think that block can handle?
thegreentaco
Member
hmmm....I thought boostin 10:1 was pushin it, but damn 10.8:1. Keep your fingers crossed on that one
Zero Signal
Active Member
Someone mentioned N2O. I thought the compression ratio limits were the same for boost and nitrous. So would it or wouldn't it be safe to run N2O with high compression? I wouldn't mind having a bottle in the back for some crazy fun from time to time.
Its safer than boost due to the fact that it comes out at a temperature that is below freezing. This cools the intake charge and helps avoid detonation. Some guys I know will run a small 20hp shot on their SC'd cars strictly for the cooling properties of the nitrous. C02 has the same properties, but since it displaces O2 it will hurt performance rather than help.
Adam95GT
New Member
BlackVert
15 Year Member
95strokerPSU
Member
Spray it. I think I'm gonna get a Zex dry kit jetted for a 100 shot and a window switch. I'm at 10.5:1 CR.
MattZ281LE
Founding Member
The basic SC kits for LS1/LT1 cars are 6# They are 10.1/10.5 respctively. Keep it around that with a good tune. High quality fuel would be a must.
if you kept the boost low i think you would be okay. like an a-trim would be a good little s/c for something like this IMO.
about the nitrous performing a cooling affect. From what I've found and read about, it doesn't do anything but add nitrous. the cooling affect is minimal. I was looking into this a while back when a guy i knew was going to sell me his dry NOS kit for cheap. Increased cylinder pressure is increased cylinder pressure. your better off getting methonal injeciton for its cooling affects rather than N2O. nitrous is just going to raise the cylinder pressure rather than lower it from cooler air.
about the nitrous performing a cooling affect. From what I've found and read about, it doesn't do anything but add nitrous. the cooling affect is minimal. I was looking into this a while back when a guy i knew was going to sell me his dry NOS kit for cheap. Increased cylinder pressure is increased cylinder pressure. your better off getting methonal injeciton for its cooling affects rather than N2O. nitrous is just going to raise the cylinder pressure rather than lower it from cooler air.
parchisi
New Member
OrangeMustangGt
Founding Member
did anyone mention methanol injection?
suposed to be like running 120+ octane fuel.
what are ya looking for more power?! I knew if i had that combo i would be pretty damn happy for a long time......
are you thinking s/c or boost?
what kind of head gaskets do you have installed now?
with my gt0p heads i have been told i have a higher compression ratio, and that they wouldent work, but they have been fine. Actually believe it or not having a n/a cut cam will actually cause your compression to drop. it has a longer duration with both valves open to facilitate scavenging...that is how i think ive been getting away without any problems, when i used the stock cam i blew a gasket right away.
suposed to be like running 120+ octane fuel.
what are ya looking for more power?! I knew if i had that combo i would be pretty damn happy for a long time......
are you thinking s/c or boost?
what kind of head gaskets do you have installed now?
with my gt0p heads i have been told i have a higher compression ratio, and that they wouldent work, but they have been fine. Actually believe it or not having a n/a cut cam will actually cause your compression to drop. it has a longer duration with both valves open to facilitate scavenging...that is how i think ive been getting away without any problems, when i used the stock cam i blew a gasket right away.
