low Cr or e85?

[Rowleym]

I cant decide which way to go for my build. Do I swap the bottom end to an eta, and oring it with stock gasket and arps? Or should I deck it a bit, and raise the cr a hair for some e85 action. I cant decide!

[sayed ali]

No need for e85 unless you'll use it for drag races or so.. and you want big hp numbers, anyway even with low cr + other goodies you can get a very nice power..

[Rowleym]

the only reason for me wanting e85 is because there is 1 gas station in my town, and it sells 91 octane, or e85. and e85 is cheap as piss. im shooting for around 400hp.

[ForcedFirebird]

Nothing wrong with stock compression - the b25 is only 8.8:1 as it is ;)

[travish325]

the only reason for me wanting e85 is because there is 1 gas station in my town, and it sells 91 octane, or e85. and e85 is cheap as piss. im shooting for around 400hp.

you can do that on a stock motor on 91octane

[Rowleym]

so you guys would rather keep it at 8.8:1 vs going with an eta bottom end? I'm having the block o-ringed very soon (anyone buy the isky tool and rent it out around here?) and I have ARP studs and a Goetze gasket. I think this should be sufficient for around 400

[Ginsterman98]

I would think you would be fine. What does the ETA bottom end net you? The way I look at things is like this.
You can always turn it up to make more power on lower CR.
You can run E85 and give it more timing and boost and make stupid power safely.
You can go in the middle and keep some CR in the motor and make good power on pump gas with conservative timing.
The last choice is how I built my VR6. has good torque out of boost and is very safe and reliable. What do you plan on using your car for? That should be the deciding factor on CR, turbo and fuel choices.

[Rowleym]

Track and drifting. Mainly for a learning experience though. I'm about to go to school for mechanical engineering.

[JCarp90]

the only reason for me wanting e85 is because there is 1 gas station in my town, and it sells 91 octane, or e85. and e85 is cheap as piss. im shooting for around 400hp.

The question is: How many stop lights does your town have if you only have 1 gas station?

[ForcedFirebird]

I would think you would be fine. What does the ETA bottom end net you? The way I look at things is like this.
You can always turn it up to make more power on lower CR.
You can run E85 and give it more timing and boost and make stupid power safely.
You can go in the middle and keep some CR in the motor and make good power on pump gas with conservative timing.
The last choice is how I built my VR6. has good torque out of boost and is very safe and reliable. What do you plan on using your car for? That should be the deciding factor on CR, turbo and fuel choices.

b25 = 8.8:1
b27 with 885 head = 8.4:1
seta = 8.5:1

I have boosted 9.6:1 motors with zero issues, pump gas. The m20 is a low CR motor to begin with in comparison to most modern engines. No need to lower compression on any of the combinations...

[Rowleym]

Well anyways. I went m50. I have a .140 head gasket and arp studs. With decent tuning and 91 octane, how do you think I will do? I only have 91 octane or corn fuel here. I live in the middle of nowhere with 1 gas station.

[einstein57]

Track and drifting. Mainly for a learning experience though. I'm about to go to school for mechanical engineering.

They tend to skip the turbo section in fluid mechanics. But you will learn how to calculate compressor efficiency in thermodynamics.

[Rowleym]

The question is: How many stop lights does your town have if you only have 1 gas station?

LOL. Literally 1. and its about a mile outside of town. Its near our only highway. haha. Green Lake, Wisconsin. Look it up.

[JCarp90]

LOL. Literally 1. and its about a mile outside of town. Its near our only highway. haha. Green Lake, Wisconsin. Look it up.

That's classic.

[Rowleym]

That's classic.

yea pretty much. I have a m50 I'm swapping in. Using a .140 mls and burning some corn. I'm going to be using a smaller turbo for near instant spool for drifting.