400 needs 12:1 compression
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From: western montana
400 needs 12:1 compression
I am searching for 12-1 (11:1 min if I have to). I have my block in the shop- 040 badger pistons coming and am ready to order aussie heads. I'm thinking that put me at about 10.5:1- though not sure. How much would I need to mill the block or heads or what else do I do to get 12:1. (assuming that this block can take 12:1???) Running propane so ping isn't an issue. Looking at a 255deh cam but am also thinking that might be too little?? Best options is what I'm looking for. I'll be running impco 425 and looking at ordering stock cleveland 4v exhaust manifolds to increase exhaust flow w/o trying to rely on headers yet.
Anyone think they can desktop dyno this build??
Anyone think they can desktop dyno this build??
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From: chicago burbs
4.040" bore, 4" stroke, 60cc chambers, .040" compressed thickness, 4.1" gasket bore dia, 3cc reliefs and 0" deck height makes over 12.7:1. if you know any more specific inputs to your components, plug them in and see what happens.
http://raceabilene.com/kelly/hotrod/compression.html
http://raceabilene.com/kelly/hotrod/compression.html
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From: Delaware
Badgers will give you about 0.665" deck clearance. That comes out to about 10.5:1 with Aussies. You will have to deck the block of mill the heads or both to get zero deck. You should have started with Tim Meyer's zero deck pistons.
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From: chicago burbs
i was figuring on Roger shaving the block if needed to get the zero deck. over .650" is a heck of a lot to shave! i second the TMI pistons at any cost. if the pistons you have ordered can't be returned, Ebay 'em. the benefit of the quench head will be just about totally negated with such a deck clearance, besides not making your compression goal.
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From: Prince George, B.C.
The 425 mixer is going to be small, you won't get the power you are looking for out of that. Have a look for a Technocarb mixer, they flow around 800 CFM, could be up to 1000 though. Then you will need a Vialle or OHG Regulator to go with it. You won't be sorry with the power diff though. Definitly go with Tim's pistons too. Shaving the heads and deck always seems to add problems down the road.
Hotshot
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From: iowa
Originally Posted by danlee
Badgers will give you about 0.665" deck clearance. That comes out to about 10.5:1 with Aussies. You will have to deck the block of mill the heads or both to get zero deck. You should have started with Tim Meyer's zero deck pistons.
just ran the calculator, on that and if the pistons were in the hole .665 with a 60cc head you would have 4.6:1 compression.
Last edited by monsterbaby; Aug 1, 2005 at 02:04 AM.
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From: Delaware
Sorry, I dropped a decimal place. The Badgers will give 0.0665 deck clearance.
If you deck the block 0.06X to get zero deck, then you must face the intake ports on the head to allow the manifold to fit.
If you deck the block 0.06X to get zero deck, then you must face the intake ports on the head to allow the manifold to fit.
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From: chicago burbs
that's what i figured too, it's still a lot to shave. the intake would have to be shaved to match, add that to the cost, complication factor and taking away from the blocks' deck strength. (over .650" would remove the whole deck surface of the block)
Last edited by grclark351; Aug 1, 2005 at 07:49 PM.
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From: Delaware
Shaving the intake port face of the head is better, because then any intake manifold will fit. If you shave the manifold, you have to do that to every manifold that you ever use.
It is much better to use zero deck pistons.
BTW Tim, when are we going to see that flow data, and how was the rally?
It is much better to use zero deck pistons.
BTW Tim, when are we going to see that flow data, and how was the rally?
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From: iowa
I will just make it unanimous and say the best way is the run with zero deck pistons. Running that much compression even on propane you really want to get that quench distance down, and my preference is to only have to deck the block far enough to square it up.
Danlee, I am not tim but the rally was great you should go up and really the rally forum there is links to video's, and pictures on there. I don't know of anyone that didn't have a really good time, and is wanting to come back for next year.
Danlee, I am not tim but the rally was great you should go up and really the rally forum there is links to video's, and pictures on there. I don't know of anyone that didn't have a really good time, and is wanting to come back for next year.
Laughing Gas
Joined: Nov 2002
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From: Fairmont
That's right Dan, you wanted to see flow numbers. I will see about posting them tomorrow. I have pictures of all four sides of the heads to see a visual comparison.
To answer your question, I enjoyed the rally.
Monsterbaby, I was over and talked to you for some time. I guess I never did introduce myself.
To answer your question, I enjoyed the rally.
Monsterbaby, I was over and talked to you for some time. I guess I never did introduce myself.
Hotshot
Joined: Dec 2003
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From: iowa
No but I figured out who you were afterwards. Hopefully you will make it next year and we can talk some more. I was over at your table, and looked through what you were displaying but never seen you over there either but it was good to see ya there.
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From: Delaware
I am sorry that I missed it. If it had been closer to me, I would have come. As it was I would have to trailer my '53, and then it would be a minimum of 5 nights (2 each way) in a Motel.
I will be making my second trip to Carlisle PA this coming weekend for the All Truck Show. I will drive the '53 there, because it is less than 200 miles.
I will be making my second trip to Carlisle PA this coming weekend for the All Truck Show. I will drive the '53 there, because it is less than 200 miles.