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#1
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Maximum compression with a turbo
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.
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4. |
#2
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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
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1970 "Real" Judge RAIII 4-speed, Atoll Blue w/painted white top. Mild RAIV headed 400 motor in now. |
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#3
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Quote:
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4. |
#4
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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. |
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#5
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I definitely be talking to Travis. I don't want to waste his time till I have the resources to move forward.
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4. |
#6
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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. |
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#7
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I have been seeing that the technology is changing quickly. I just don't want to bother him needlessly till I am ready.
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4. |
#8
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Quote:
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Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
#9
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Yes from KRE.
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#10
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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.
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4. |
#11
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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
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4. |
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#12
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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.
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4. |
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#13
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DPTTFMF!!!
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#14
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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.
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4. |
#15
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I am guessing u will use a 1 7/8 header?
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Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
#16
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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.
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4. |
#17
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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. |
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#18
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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
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#19
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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
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#20
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Quote:
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