Guest Vince27 Posted February 9, 2020 Report Share Posted February 9, 2020 Hi ! Someone had problem with coolhead flexion and make oring blow up ?? all stud have been torked at spec, new oring cylinder shaved to be straight 0.001" of différence between 2 dome (24cc) .... oring blowup on load ... my point is after years can the prestone make aluminium softer and can be flexing on load or make aluminium crack and make coolhead no more strong enoug to bold pressure ??? Quote Link to comment Share on other sites More sharing options...
Deets Posted February 10, 2020 Report Share Posted February 10, 2020 Antifreeze won’t make aluminum soft. You sure the head was milled correctly? Quote Link to comment Share on other sites More sharing options...
Guest Vince27 Posted February 10, 2020 Report Share Posted February 10, 2020 Yes perfect miled ... Fresh done too ... Cylinder and head done groove enough Space for oring expension too oring blow up at high rpm on load .... Was thinking coolhead not strong enough to hold pressure ... 14/1 run on c16 ... Quote Link to comment Share on other sites More sharing options...
SKEETER Posted February 10, 2020 Report Share Posted February 10, 2020 Your compression is not the issue. Guaranteed. Quote Link to comment Share on other sites More sharing options...
registered user Posted February 10, 2020 Report Share Posted February 10, 2020 tighten the head nuts first. then tighten cyl nuts after. this will keep the head flat to the cyl top Quote Link to comment Share on other sites More sharing options...
OneBADBanshee05 Posted February 11, 2020 Report Share Posted February 11, 2020 A couple of things could be the cause of your problem. You have to check the squish between the tops of your pistons and the coolhead domes. Your pistons could be slapping the domes. You might have to get a different set of domes or have to get a set of custom cut domes to make up the difference of your milled cylinders. You also my have to get a thicker cylinder base gasket. You timing could be advanced to much if it has a adjustable timing plate. Quote Link to comment Share on other sites More sharing options...
Deets Posted February 11, 2020 Report Share Posted February 11, 2020 Are you using Viton for your o ring? Quote Link to comment Share on other sites More sharing options...
ClaudeMachining Posted February 11, 2020 Report Share Posted February 11, 2020 Don Viton.Envoyé de mon SM-G965W en utilisant Tapatalk Quote Link to comment Share on other sites More sharing options...
Guest Vince27 Posted February 12, 2020 Report Share Posted February 12, 2020 yes We use viton oring the good one ! The groove have enough Space for the oring to expend .... we check with a stait edge the head dome and a 0.001 of différence of the 2 dome ....can be this little différence could make oring burn ... I did some recherch find. Charriot head for DM and CHEETHA cylinder , they explain pretty much my problem ! Someone use those head ??? Charriot Coolhead Quote Link to comment Share on other sites More sharing options...
Guest Vince27 Posted February 12, 2020 Report Share Posted February 12, 2020 Squish Is good been Check twice ... the timing have set back 12 degre to be sure he was not too much advence more it Go We thinking the cool head have hard Time to hold pressure .... charriot talk about the bad conception of coolhead only one stud in Middle of the head and make the oring blow up !! not sure about it ! But make sense !!! Quote Link to comment Share on other sites More sharing options...
Guest Vince27 Posted February 12, 2020 Report Share Posted February 12, 2020 https://www.cafr.ebay.ca/itm/Chariot-Banshee-DM-Cheetah-only-Cool-Head-NO-DOMES-angled-fitting-CP-/253263091818 Quote Link to comment Share on other sites More sharing options...
Guest Vince27 Posted February 15, 2020 Report Share Posted February 15, 2020 No one could answer ?? Quote Link to comment Share on other sites More sharing options...
registered user Posted February 15, 2020 Report Share Posted February 15, 2020 if u milled the head maybe the oring groove is to small now Quote Link to comment Share on other sites More sharing options...
Deets Posted February 16, 2020 Report Share Posted February 16, 2020 For viton, the groove should be 70% of the diameter. If I remember correctly Quote Link to comment Share on other sites More sharing options...
Guest Vince27 Posted February 16, 2020 Report Share Posted February 16, 2020 the groove have enough Space to expend whe the head have be torqued ... We Check to be sure to dint cut oring ... Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.