okbeast Posted June 19, 2008 Report Share Posted June 19, 2008 A little off-topic, but could someone that knows they have a COMPLETELY STOCK head measure it, from say one of the flat parts where the bolt goes to the part that mates w/ the cylinder. I have a few stockers layin around and know some are milled but dono how much. P-man, if i can figure out which one is milled i'll give it to you if you just pay shipping, or meet u somewhere in DFW to give it to ya. Quote Link to comment Share on other sites More sharing options...
dlnoss Posted June 19, 2008 Report Share Posted June 19, 2008 From memory, I think from the nut flat to the bottom surface of a stock head is 0.900" -David Quote Link to comment Share on other sites More sharing options...
okbeast Posted June 19, 2008 Report Share Posted June 19, 2008 From memory, I think from the nut flat to the bottom surface of a stock head is 0.900" -David Ok thanks David, I'll measure what I have and see what i get. Quote Link to comment Share on other sites More sharing options...
P-man Posted June 19, 2008 Author Report Share Posted June 19, 2008 Ok thanks David, I'll measure what I have and see what i get. Thats quite a nice offer okbeast, i don't have a caliper but i could probably buy one. Quote Link to comment Share on other sites More sharing options...
deckheight Posted June 20, 2008 Report Share Posted June 20, 2008 .020" will reduce the OEM chamber volume apx. 1.66cc. From what I have seen the heads w/2GUY-1 casting numbers are from early Banshee motors and have apx. 1.8cc larger chamber volumes than later 2GUY-2 castings to start with. Both castings are well within being 92 octane safe (assuming OEM deck height) and will result in a squish thickness of apx .060" (again assuming OEM deck height) w/.020" faced off them. I'll let you do the rest of the math... If you need more info let me know. Good luck yea actually i might be interested, what would .20 raise the compression to here. im at 500 or so feet Quote Link to comment Share on other sites More sharing options...
mopar1rules Posted June 21, 2008 Report Share Posted June 21, 2008 deckheight, do you know what the stock cc size is on a stock unmilled head? also, whats like the tightest that one would want to run his squish....like .040? for pump gas i mean. Quote Link to comment Share on other sites More sharing options...
brugal Posted June 21, 2008 Report Share Posted June 21, 2008 The advantage of getting a coolhead is that you can change the dome size. Quote Link to comment Share on other sites More sharing options...
okbeast Posted June 21, 2008 Report Share Posted June 21, 2008 Hey deck, can you confirm that a stock head is .900"? Quote Link to comment Share on other sites More sharing options...
deckheight Posted June 21, 2008 Report Share Posted June 21, 2008 I am getting .904" with a decent digital caliper... I would think that .004" is within OEM tolerances. Hey deck, can you confirm that a stock head is .900"? Quote Link to comment Share on other sites More sharing options...
deckheight Posted June 21, 2008 Report Share Posted June 21, 2008 mopar, I have cc'd several of both castings and both have consistently been within 0.2cc from head to head. 2GUY-1 castings=24.20cc chamber volume. 2GUY-2 castings=22.40cc. Don't forget to add another .84cc to both for an OEM head gasket, if your using one, and/or trying to make some type comparison to one of the after market O-ring type heads. IMHO, there are several things effecting what a proper squish velocity would be for a particular engine... Squish thickness just being one of them... I would really like more specific data before commenting. E-mail me private if you want. I can say that I have never needed to run less than .045" on any 2-stroke engine to get the MSV I needed for that particular application and that being only on extremely high compression motors. Normally I see .048" to .053" for 92 thru 110 octane set-ups with normal squish band widths (10mm +/-). At any rate, that's what works for me... However, MSV opinions vary... And unfortunately, it is quite often debatable... I agree with brugal... For what one of the Noss or Chariot style head assemblies cost, it is not making much sense for someone to pay to have an OEM casting worked over, unless of course a person could get it done pretty cheap or is going for a sleeper look or something... Plus the OEM castings are pretty thin around the coolant in and out areas. It is not unusual to have to tig weld "plugs" in those two areas if more than .070" or .080" needs to be faced. deckheight, do you know what the stock cc size is on a stock unmilled head? also, whats like the tightest that one would want to run his squish....like .040? for pump gas i mean. Quote Link to comment Share on other sites More sharing options...
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