http://www.speedwaybids.com/DynamicC...Calculator.php

If someone wants to use the calculator thats it... I really need to nail down the elevation and volumetric effeciency a little but it will need to wait untill the heads are chosen. The calculator isnt perfect but it helps.

 

There are no numbers or anything stamped in that spot, its all smooth. I measured the clearance between the top of the piston and the deck with a feeler gauge. The thickest gauge that I was able to fit under a straight edge was .012. I will probably go with 93oct, its worth the 20cents more per gallon I always thought. Please let me know about them heads your buddy had, I would definetly be interested in them. Thanks

 

No numbers and the measurement you gave indicate the blocks been decked. I think you have two choices one is to take the engine to the machine shop and have it measured the otheris to assume a .010 deck height and use that for the calcs. I am starting to sense some mismatches here but lets play it out and see. I check and see if he still has the heads. I might not get to the calcs till tomarrow, but I try to get to them soon.

 

The deck height is probably .010, the .012 gauge was a little tight. What do you mean by mismatches?

 

Using a .045 quench distance it puts your compression above 10:1 which I think is touchy for running pump gas.... If you dont mind I would like to go on the dart forum with your specsand see how tolerant the dart heads are to detonation.

 

Do whatever you need to do, I really appreciate all your help. Whatever setup you think is the best for me, that is what I will go with, you know a lot more about all this stuff than I do.

 

ZACK this is one response from another site I put the question out on its basically what I thought its borderline 93 should be ok but your tune will need to be on. http://www.hotrodders.com/forum/383-...on-143769.html
Ill check the dart site they were not responding last I checked though I see if the heads are still available for ya.

 

The dart site http://www.dartheads.com/dartboard/showthread.php?t=324

 

I read both site posts, they all seem to agree, like you said, it will be border line 93oct but I should be alright with a good tune. I am anxious to get this motor built but I am aware that time and research are needed for the build to work correctly. Hopefully the heads are still available that would be nice. Thanks

 

ZACK I spoke to the guy today they are using them on a engine he has a set of double humps but the chambers are to small for you. The dart ones seem like a good deal use a head gasket wit a compressed thickness of .035. good luck with it and double check your clearances.