Any heads yet?
Need Engine Asap!!!!!!
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Senior User
Joined: Apr 2006
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Need Engine Asap!!!!!!
I need to know who has a good reliable engine? I don't have the time to do it myself, I need it yesterday. I can't wait for my machine shop. I would like some performance option if possible. Reliability is a must. Long-block 400 smog in heads.
Laughing Gas
Joined: Nov 2002
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From: Fairmont
We have that step dish piston for the aussie head. It will yeild 9.5:1 compression ratio. and quench!!
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Posting Guru
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From: western montana
anyone make a 400 yet using your 9.5:1 with a lower duration cam like a deh255, xe256-262? where the dynamic is going to be well over 8:1- like maybe 8.4:1?
Wondering what I can expect octane wise (will still go propane...but wondering non-the-less)
Wondering what I can expect octane wise (will still go propane...but wondering non-the-less)
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From: Delaware
Posting Legend
Joined: Sep 2001
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I am still working on my engine compression with my cam to get it right. That edyno of danlee's is a GIANT help!!!! I added it to the links section on my website. My engine is only ~9:1 with open chambers and 260/268 cam.
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From: western montana
Originally Posted by Torque1st
I am still working on my engine compression with my cam to get it right. That edyno of danlee's is a GIANT help!!!! I added it to the links section on my website. My engine is only ~9:1 with open chambers and 260/268 cam.
I like the site..thanks
according to them I will basically have 9.24 static, 8.68 dynamic and will need 97+ octane.
wow...good thing it's a propane motor eh? now i know i entered the stuff right and i got the right static cr. I got the right feedback on the cam as far as ivc- 36. So i'm not seeing where the dynamic should be too far off-
except it's higher than other numbers I've gotten: Silvolite site says I'm at 8.4 max.
Not disappointed in anyway since it is a propane engine and that was my original goal (8.7-8.8:1 dynamic) anymore and longevity would be screwed...
wow....surprise of the week to say the least! wondering how many folks will go with the 9.5:1 and too small a cam. Of course i've been vocally about my wondering about that for a while now.
Last edited by roger dowty; Nov 1, 2006 at 11:16 PM.
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From: Delaware
I am still working on the website. Calculating the actual volume of fuel/air mixture in the cylinder at different RPM is difficult. I have not been able to find a mathematical model or even a coherent description of the process. I am modeling it as an exponential equation (e**kt), where t is the valve open time and k is compound variable made up of positive and negative values of air flow.
Right now the real work on my truck is taking precedence. I took the rear housing out to get it narrowed, so the 10" wheels with the 12" tires fit under the fenders. Also I am building a cable harness so I can run my EEC-IV EFI computer and control my new 434 EFI motor when it is mounted on Tim Meyer's Dyno. That should happen in early December.
Right now the real work on my truck is taking precedence. I took the rear housing out to get it narrowed, so the 10" wheels with the 12" tires fit under the fenders. Also I am building a cable harness so I can run my EEC-IV EFI computer and control my new 434 EFI motor when it is mounted on Tim Meyer's Dyno. That should happen in early December.
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Tony1790
1987 - 1996 F150 & Larger F-Series Trucks
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Apr 22, 2003 02:52 PM