[quick67bird]

I have aluminum D port heads that I am wondering what the maximum compression can be ran on E-85. It is a street engine that will be raced once a while. Mainly a grudge/ who is faster type of car for my group of friends.

The heads are 72 cc 340 cfm version from KRE that have been reworked by SD Performance.

[bignate]

I don't have any real world experience with it, but I have been researching a supercharged E-85 application I'd like to build someday.

Everything I have seen online about E-85 is that no one really knows its limit yet. I have seen a few references to guys running 10.5:1 and 15-20 or more lbs. of boost, without problems. Albeit these are LSX and Mustang applications that I've read about.

Another FYI, if nitrous is ever going to be thought about, it works with E-85 but it's not as potent as it is with gas. The E-85 already significantly cools the intake charge, so you lose that benefit of N2O.

Nate

[quick67bird]

Originally Posted by bignate

I don't have any real world experience with it, but I have been researching a supercharged E-85 application I'd like to build someday.

Everything I have seen online about E-85 is that no one really knows its limit yet. I have seen a few references to guys running 10.5:1 and 15-20 or more lbs. of boost, without problems. Albeit these are LSX and Mustang applications that I've read about.

Another FYI, if nitrous is ever going to be thought about, it works with E-85 but it's not as potent as it is with gas. The E-85 already significantly cools the intake charge, so you lose that benefit of N2O.

Nate

I thought about nitrous and have a bigshot plate, but I am looking toward turbos for more consistent power.

[David Holmberg]

I'll say the same thing I said on the Bullet, you need to be talking to Travis Quillen.

There are lots of pluses and minuses, depending on your goal and intended use.

[quick67bird]

Originally Posted by David Holmberg

I'll say the same thing I said on the Bullet, you need to be talking to Travis Quillen.

There are lots of pluses and minuses, depending on your goal and intended use.

I definitely be talking to Travis. I don't want to waste his time till I have the resources to move forward.

[David Holmberg]

The thought process has changed so much, very quickly.

If I even knew the right answer it would probably be wrong by the time you talk with Travis.

[quick67bird]

Originally Posted by David Holmberg

The thought process has changed so much, very quickly.

If I even knew the right answer it would probably be wrong by the time you talk with Travis.

I have been seeing that the technology is changing quickly. I just don't want to bother him needlessly till I am ready.

[grandville455]

Originally Posted by quick67bird

I have aluminum D port heads that I am wondering what the maximum compression can be ran on E-85. It is a street engine that will be raced once a while. Mainly a grudge/ who is faster type of car for my group of friends.

The heads are 72 cc 340 cfm version from KRE that have been reworked by SD Performance.

I didn't know u could get 340 out of the KRE D ports?

[ponjohn]

Originally Posted by grandville455

I didn't know u could get 340 out of the KRE D ports?

Yes from KRE.

[quick67bird]

Originally Posted by grandville455

I didn't know u could get 340 out of the KRE D ports?

They were the 340 cfm heads from KRE that I sent up to Dave and he reworked them a bit and picked up a little cfm in the low lift areas. I have my flow sheet posted in one of my posts.

[quick67bird]

Originally Posted by grandville455

I didn't know u could get 340 out of the KRE D ports?

Here is my head flow Darby.

These are the flow numbers after SD ported them on Daves flowbench.
lift......Intake......Exhaust.....%
100....77.1..........62.6.........81.1
200....150.6.........114.6........76
300....204.9.........152.9........74.6
400....250...........177.9........71.1
500....288.2.........200.3........69.5
600....319.1.........226.6........71
700....336.8.........239.7........70.5

[quick67bird]

I know that D port heads are not the best heads out there, but something in me would like to see how fast I can make my car with a lowly set of D ports.

[johnta1]

DPTTFMF!!!

[quick67bird]

Originally Posted by johnta1

DPTTFMF!!!

The D ports don't get much love and I understand why. I know the exhaust is deficient when compared to the RA IV ports, but I have ran them for so long I guess they have a place in my heart.

[grandville455]

Originally Posted by quick67bird

Here is my head flow Darby.

These are the flow numbers after SD ported them on Daves flowbench.
lift......Intake......Exhaust.....%
100....77.1..........62.6.........81.1
200....150.6.........114.6........76
300....204.9.........152.9........74.6
400....250...........177.9........71.1
500....288.2.........200.3........69.5
600....319.1.........226.6........71
700....336.8.........239.7........70.5

Thanks, Do U know your runner cc now? Whats the port size?
I am guessing u will use a 1 7/8 header?

[quick67bird]

Originally Posted by grandville455

Thanks, Do U know your runner cc now? Whats the port size?
I am guessing u will use a 1 7/8 header?

I would have to look at my paperwork, but unfortunately the.information is at home in WA and I am working in ND. I will check when i get home in a week or so. I do have 1 7/8 headers from Maddog.

[BruceWilkie]

Big Nate about summed it up... how much compression is determined by a bunch of factors... manifold air temp(compressor discharge temp) chamber layout, A/F ratio, cylinder to cylinder variations, possibly dynamic compression to some extent, probably more.

Lots of subject material over on Yellow Bullet in the turbo section.

[cgeise]

The higher the cr the smaller the tune window, I have heard of 11to1 with alcohol. with a turbo if you need more power -- add boost -- lol but id say e-85 and 10 to 1 with moderate boost should be fine

[rodneybutler]

I agree with Curt. I did an LS RHS aluminum engine with single turbo for a H2 Hummer. 9:1 compression on E85. Made 1600 hp with a bunch of boost. Problem was the engine was lazy until the boost came on and then was uncontrollable. Now the customer wants less hp and more drivability. So I'm upping the compression for less boost. Funny how people think they want big power until they get it! Lol

[cgeise]

Originally Posted by rodneybutler

I agree with Curt. I did an LS RHS aluminum engine with single turbo for a H2 Hummer. 9:1 compression on E85. Made 1600 hp with a bunch of boost. Problem was the engine was lazy until the boost came on and then was uncontrollable. Now the customer wants less hp and more drivability. So I'm upping the compression for less boost. Funny how people think they want big power until they get it! Lol

LOL ---- BEEN THERE DONE THAT