stroking Posted August 24, 2012 Report Share Posted August 24, 2012 IT has 21cc domes .045 squish 197 ex 128 trans think its to high Quote Link to comment Share on other sites More sharing options...
kessig4x4 Posted August 24, 2012 Report Share Posted August 24, 2012 IT has 21cc domes .045 squish 197 ex 128 trans think its to high Howd you get it to do that haha did you put stock pistons on 115 rods or something Quote Link to comment Share on other sites More sharing options...
kessig4x4 Posted August 24, 2012 Report Share Posted August 24, 2012 supposd to run a different base gasket maybe? whats the setup or did you already figure out the issue Quote Link to comment Share on other sites More sharing options...
RadarRacing Posted August 24, 2012 Report Share Posted August 24, 2012 If you flat plate cc'ed out that dome and got 21ccs then that is not at all the right dome for a 4mm supercub. You would end up with much less than 21ccs trapped volume and thus you now have 18 or 20-1 compression regardless of what the squish and step is in the dome. Quote Link to comment Share on other sites More sharing options...
Wildcardracing Posted August 24, 2012 Report Share Posted August 24, 2012 I agree with radar. Your UCCR is off the charts lol. You should be looking at domes in the 26-28cc range for that motor on alcohol. I can figure it up for you if you want to contact me, and get you set up with a set of domes that will work. -Brandon Quote Link to comment Share on other sites More sharing options...
dajogejr Posted August 24, 2012 Report Share Posted August 24, 2012 Hot damn that's some cranking compression. Stroking, is this a known, good working and accurate gauge? In my experience, a cheap or bad gauge reads low, but it could easily go the other way as well. Just think how hard that thing would leave the line...then implode.... Quote Link to comment Share on other sites More sharing options...
J-Madd Posted August 24, 2012 Report Share Posted August 24, 2012 21 cc on a 72 mm (or whatever) bore is small. Throw in a positive deckheight and that's even worse. Quote Link to comment Share on other sites More sharing options...
okbeast Posted August 24, 2012 Report Share Posted August 24, 2012 Run it. Just make sure it's not a 29 L/R rod. Quote Link to comment Share on other sites More sharing options...
BUILDER Posted August 24, 2012 Report Share Posted August 24, 2012 Perfect just make sure you carry a extra crank with you for when it eats the rod bearings out in the first 30 mins lol Quote Link to comment Share on other sites More sharing options...
stroking Posted August 25, 2012 Author Report Share Posted August 25, 2012 re checked and its 20cc domes....i got some 26cc im going to try and see what it gives oh and it would have went to over 300psi i just got tired of kicking Quote Link to comment Share on other sites More sharing options...
stroking Posted August 25, 2012 Author Report Share Posted August 25, 2012 (edited) where should it be for race fuel ? Edited August 25, 2012 by stroking Quote Link to comment Share on other sites More sharing options...
BANSHEE HP Posted August 25, 2012 Report Share Posted August 25, 2012 where should it be for race fuel ? Atleast 100psi less Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted August 26, 2012 Report Share Posted August 26, 2012 I love me some high compression, but damn! I would guess that when those domes were designed someone forgot about the extra added volume from the larger bore that will be compressed in to the dome. As for where to bring it in for race fuel, I would say for a drag application 160-170 and no more. I would prefer to bring it in at the 160ish side though to keep cranking losses to a minimum. From my experience the high end motors come out better on compression but really can sacrifice some juice on the big end with to much compression. Not to mention if you keep it on the lower side, you can afford to wick the timing up a little more to make up for it Quote Link to comment Share on other sites More sharing options...
gotta_goatsfast Posted August 26, 2012 Report Share Posted August 26, 2012 You could probably diesel that motor and lose the spark plugs and ignition system Quote Link to comment Share on other sites More sharing options...
stroking Posted August 27, 2012 Author Report Share Posted August 27, 2012 I love me some high compression, but damn! I would guess that when those domes were designed someone forgot about the extra added volume from the larger bore that will be compressed in to the dome. As for where to bring it in for race fuel, I would say for a drag application 160-170 and no more. I would prefer to bring it in at the 160ish side though to keep cranking losses to a minimum. From my experience the high end motors come out better on compression but really can sacrifice some juice on the big end with to much compression. Not to mention if you keep it on the lower side, you can afford to wick the timing up a little more to make up for it sounds like your saying low compresion (150-170) and high timing would be better situated for long distance drag racing Quote Link to comment Share on other sites More sharing options...
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